how to find the button in the fragment of Activity

how to find the button in the fragment of Activity - android

Just started learning android. Help please. I have three fragments, each has a button that must run one of the streams of the media player. How can I find the button of my activity in the fragment that would later attach to it a specific stream?
Tried to make a reference to the button so that:
btnStart = (Button) titleAdapter.frags[0].getView().findViewById(R.id.btnStart);
Did not work, an error java.lang.NullPointerException, what I'm doing wrong
public class TitleAdapter extends FragmentPagerAdapter {
private final String titles[] = new String[] { "FragA", "FragB", "FragC" };
private final Fragment frags[] = new Fragment[titles.length];
public TitleAdapter(FragmentManager fm) {
super(fm);
frags[0] = new FragmentA();
frags[1] = new FragmentB();
frags[2] = new FragmentC();
}
#Override
public CharSequence getPageTitle(int position) {
Log.v("TitleAdapter - getPageTitle=", titles[position]);
return titles[position];
}
#Override
public Fragment getItem(int position) {
Log.v("TitleAdapter - getItem=", String.valueOf(position));
return frags[position];
}
#Override
public int getCount() {
return frags.length;
}
}
code MainActivity.java:
public class MainActivity extends FragmentActivity {
final static String LOG_TAG = "myLogs";
static MediaPlayer mediaPlayer;
static AudioManager am;
static CheckBox pdaStream;
static Button btnNews;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mViewPager = (ViewPager) findViewById(R.id.pager);
TitleAdapter titleAdapter = new TitleAdapter(getSupportFragmentManager());
mViewPager.setAdapter(titleAdapter);
mViewPager.setCurrentItem(1);
mViewPager.setOffscreenPageLimit(2);
pdaStream = (CheckBox) findViewById(R.id.pdaStream);
am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
SeekBar music = (SeekBar)findViewById(R.id.seekBar1);
initBar(music, AudioManager.STREAM_MUSIC);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.news:
Intent intent = new Intent(this, RSSActivity.class);
startActivity(intent);
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
public static void initBar(SeekBar bar, final int stream) {
bar.setMax(am.getStreamMaxVolume(stream));
bar.setProgress(am.getStreamVolume(stream));
bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
public void onProgressChanged(SeekBar bar, int progress,
boolean fromUser) {
am.setStreamVolume(stream, progress,
AudioManager.FLAG_PLAY_SOUND);
}
public void onStartTrackingTouch(SeekBar bar) {
// no-op
}
public void onStopTrackingTouch(SeekBar bar) {
// no-op
}
});
}
}
code fragments similar, here's one of them
code FragmentA.java:
public class FragmentA extends Fragment {
final static String LOG_TAG = "myLogs";
private static ProgressBar progressBar;
static CheckBox pdaStream;
public FragmentA() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_a, container, false);
final Button Play = (Button) rootView.findViewById(R.id.btnStart);
progressBar = (ProgressBar) rootView.findViewById(R.id.progressBar);
progressBar.setVisibility(View.GONE);
pdaStream = (CheckBox) getActivity().findViewById(R.id.pdaStream);
return rootView;
} }
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/background"
tools:context=".MainActivity" >
<android.support.v4.view.PagerTabStrip
android:id="#+id/pager_title_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="#drawable/bg_pager"
android:paddingBottom="4dp"
android:paddingTop="4dp"
android:textColor="#fff" />
</android.support.v4.view.ViewPager>
<SeekBar
android:id="#+id/seekBar1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="60dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:thumb="#drawable/seek" />
<CheckBox
android:id="#+id/pdaStream"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="70dp"
android:text="#string/chkbox" />
</RelativeLayout>
fragment_a.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="#+id/btnStart"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:textSize="16sp"
android:onClick="onClick"
android:background="#drawable/play_button"/>
<ProgressBar
android:id="#+id/progressBar"
style="?android:attr/progressBarStyleLarge"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
</RelativeLayout>

public static Fragment getCurrentFragment(ViewPager pager, FragmentPagerAdapter adapter) {
try {
Method m = adapter.getClass().getSuperclass().getDeclaredMethod("makeFragmentName", int.class, long.class);
Field f = adapter.getClass().getSuperclass().getDeclaredField("mFragmentManager");
f.setAccessible(true);
FragmentManager fm = (FragmentManager) f.get(adapter);
m.setAccessible(true);
String tag = null;
tag = (String) m.invoke(null, pager.getId(), (long) pager.getCurrentItem());
return fm.findFragmentByTag(tag);
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
return null;
}
Then put a public getter for button in FragmentA.java,
public Button getPlayButton()
{
return Play;
}
in your Fragment activity,
Fragment currenFragment = getCurrentFragmet(mViewPager,titleAdapter);
if(currenFragment!=null){
// cast the fragment to FragmentA class, then call getter
((FragmentA)currentFragment).getPlayButton();
}

use following code in onActivityCreated() of fragment
btnStart = (Button) getView().findViewById(R.id.btnStart);

Related

SwipeRefreshLayout + ViewPager with Fragments not working

I have implemented the SwipeRefreshLayout in many of the pages,and it working fine. but here i got stuck with one specific implementation , where i have a SwipeRefreshLayout for the ViewPager and ViewPager holding the FragmentPagerAdapter.
In my case , I have a ViewPager with two tabs and each holding the fragment with RecyclerView. On main page I have a SwipeRefreshLayout and on the onRefresh i need to load the API and update the fragments in ViewPager. Updating is working fine but unfortunately RecyclerView inside the Fragment ( ViewPager tab Item ) not scrolling top and it always calling the SwipeToRefresh.
I am familiar with using the SwipeRefreshLayout with RecyclerView, but here the problem is the main child of the SwipeRefreshLayout is ViewPager and it having the Fragment inside it and that fragment is holding the RecyclerView.
I have a thought of moving the SwipeRefreshLayout inside the fragments for the RecyclerView , but again here i have challenges like both the Fragments is having the same API. So that i am using the SwipeRefreshLayout directly on ViewPager to refresh my data.
Here is some of my codes.
MainContacts.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/ll_no_records"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:gravity="center"
android:orientation="vertical"
android:visibility="gone">
<ImageView
android:id="#+id/iv_retry"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="center"
android:contentDescription="#string/todo"
android:src="#drawable/ic_reload" />
<TextView
android:id="#+id/textError"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:gravity="center"
android:text="#string/no_contact_found"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Medium"
android:textColor="#color/colorDarkGray" />
</LinearLayout>
<LinearLayout
android:id="#+id/ll_process"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:alpha="1"
android:gravity="center"
android:orientation="vertical"
android:visibility="visible">
<ProgressBar
android:id="#+id/progress"
android:layout_width="50dp"
android:layout_height="40dp"
android:layout_gravity="center"
android:indeterminate="true" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="#string/fetching"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Medium"
android:textColor="#color/colorDarkGray" />
</LinearLayout>
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/contacts_screen"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<android.support.design.widget.TabLayout
android:id="#+id/my_contacts_tabs"
style="#style/MyCustomTabLayout"
android:layout_width="match_parent"
app:tabBackground="#color/colorWhite"
android:layout_height="wrap_content" />
<android.support.v4.view.ViewPager
android:id="#+id/my_contacts_view_pager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1"
android:background="#android:color/transparent" >
</android.support.v4.view.ViewPager>
</LinearLayout>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
contacts.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:hc="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="#+id/ll_no_records"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:gravity="center"
android:orientation="vertical"
android:visibility="gone">
<ImageView
android:id="#+id/iv_retry"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="center"
android:contentDescription="#string/todo"
android:src="#drawable/ic_reload" />
<TextView
android:id="#+id/textError"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:gravity="center"
android:text="#string/no_contact_found"
android:textAppearance="#style/Base.TextAppearance.AppCompat.Medium"
android:textColor="#color/colorDarkGray" />
</LinearLayout>
<com.diegocarloslima.fgelv.lib.FloatingGroupExpandableListView
android:id="#+id/contactList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/searchContainer"
android:animateLayoutChanges="true"
android:childDivider="#android:color/transparent" />
</RelativeLayout>
MainFragment ( Which i am using to load the child fragments , SwipeTORefreshLayout + ViewPager here)
public class MainFragment extends BaseFragment {
private TextView mTextError;
private LinearLayout llNoRecords, ll_process;
private ImageView iv_retry;
private MaterialSearchView materialSearchView;
PHCJsonResponseContactDetailModel mContactResponseModel;
int expandableListSelectionType = ExpandableListView.PACKED_POSITION_TYPE_NULL;
boolean actionModeEnabled;
private Activity mActivity;
SwipeRefreshLayout mSwipeRefreshLayout;
private ViewPager viewPager;
TabLayout tabLayout;
ContactsTabPagerAdapter mAdapter;
ArrayList<PHCContactDetailModel> mContactList =new ArrayList<>();
ArrayList<PHCContactDetailModel> mFavoriteList;
boolean isSwipeToRefresh;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mActivity = getActivity();
View view = inflater.inflate(R.layout.phc_contact_fragment, container, false);
getViewId(view);
setListener();
if (isNetworkAvailable()) {
if(((MainDrawerActivity)mActivity).getPHCContactFragmentData()==null)
getAllContactData();
else
updateWidgets();
} else {
showNoNetworkToast();
llNoRecords.setVisibility(View.VISIBLE);
mTextError.setText(getResources().getText(R.string.no_internet_retry));
}
return view;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Override
public void onResume() {
super.onResume();
}
/*#Override
public void onPrepareOptionsMenu(final Menu menu) {
getActivity().getMenuInflater().inflate(R.menu.menu_fragment_group, menu);
}*/
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_fragment_contacts, menu);
MenuItem item = menu.findItem(R.id.action_search);
materialSearchView.setMenuItem(item);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.action_create_group) {
Intent createGroupIntent = new Intent(getActivity(), PHCCreateGroupActivity.class);
createGroupIntent.putExtra("comeFrom", PHCAppConstant.GROUP_ADD);
getActivity().startActivity(createGroupIntent);
}
return super.onOptionsItemSelected(item);
}
private void setListener() {
iv_retry.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (isNetworkAvailable()) {
getAllContactData();
} else {
showNoNetworkToast();
}
}
});
}
private void getViewId(View view) {
mTextError = (TextView) view.findViewById(R.id.textError);
ll_process = (LinearLayout) view.findViewById(R.id.ll_process);
llNoRecords = (LinearLayout) view.findViewById(R.id.ll_no_records);
iv_retry = (ImageView) view.findViewById(R.id.iv_retry);
viewPager = (ViewPager) view.findViewById(R.id.my_contacts_view_pager);
tabLayout = (TabLayout) view.findViewById(R.id.my_contacts_tabs);
mSwipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipeRefreshLayout);
mSwipeRefreshLayout.setColorSchemeResources(R.color.colorPrimary,
android.R.color.holo_green_dark,
android.R.color.holo_orange_dark,
android.R.color.holo_blue_dark);
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
if(mContactResponseModel!=null && mContactResponseModel.getData().size() >0)
{
isSwipeToRefresh = true;
getAllContactData();
}
}
});
materialSearchView = (MaterialSearchView) getActivity().findViewById(R.id.search_view);
}
private void getAllContactData() {
if (isNetworkAvailable()) {
// showProgress();
PHCApiInterface apiService = PHCApiClient.getClient(getActivity()).create(PHCApiInterface.class);
Call<PHCJsonResponseContactDetailModel> call = apiService.contactData(getApplicationData(getActivity()).getAuthToken(), getApplicationData(getActivity()).getUserID());
call.enqueue(new Callback<PHCJsonResponseContactDetailModel>() {
#Override
public void onResponse(Call<PHCJsonResponseContactDetailModel> call, Response<PHCJsonResponseContactDetailModel> response) {
Log.d(TAG, "getContacts URL " + response.raw().request().url());
Log.d(TAG, "getContacts Resp " + new Gson().toJson(response.body()));
mContactResponseModel = response.body();
((MainDrawerActivity)mActivity).setPHCContactFragmentData(mContactResponseModel);
if(mSwipeRefreshLayout.isRefreshing())
{
// cancel the Visual indication of a refresh
mSwipeRefreshLayout.setRefreshing(false);
}
if(isSwipeToRefresh)
{
isSwipeToRefresh=false;
updateWidgets();
}
else
updateWidgets();
}
#Override
public void onFailure(Call<PHCJsonResponseContactDetailModel> call, Throwable t) {
if(mSwipeRefreshLayout.isRefreshing())
{
// cancel the Visual indication of a refresh
mSwipeRefreshLayout.setRefreshing(false);
}
isSwipeToRefresh=false;
dismissProgress();
mTextError.setVisibility(View.VISIBLE);
}
});
} else {
isSwipeToRefresh=false;
if(mSwipeRefreshLayout.isRefreshing())
{
// cancel the Visual indication of a refresh
mSwipeRefreshLayout.setRefreshing(false);
}
showNoNetworkAlert();
}
}
private void updateWidgets() {
if (mContactResponseModel.getStatusCode() == 401 || mContactResponseModel.getStatusCode() == 402) {
showSessionExpireAlert(mContactResponseModel.getStatusMessage(), mContactResponseModel.getStatusCode());
return;
}
if (mContactResponseModel != null && mContactResponseModel.getStatusCode() == 1) {
dismissProgress();
mTextError.setVisibility(View.GONE);
mContactList = mContactResponseModel.getData();
mFavoriteList = mContactResponseModel.getData();
if(mContactList!=null && mContactList.size()>0)
{
llNoRecords.setVisibility(View.GONE);
mAdapter = new ContactsTabPagerAdapter(getActivity().getApplicationContext(), getChildFragmentManager(), mContactList , mFavoriteList);
viewPager.setAdapter(mAdapter);
tabLayout.setupWithViewPager(viewPager);
}
else {
llNoRecords.setVisibility(View.VISIBLE);
}
} else {
dismissProgress();
mTextError.setVisibility(View.VISIBLE);
}
}
public void dismissProgress() {
ll_process.setVisibility(View.GONE);
super.dismissProgress();
}
private void initiateContactChat(final PHCFacilityDetailsModel facilityDetailsModel, final int groupPosition, final int childPosition) {
String header = getApplicationData(getActivity()).getAuthToken();
PHCApiInterface apiService = PHCApiClient.getClient(getActivity()).create(PHCApiInterface.class);
Call<PHCContactInitiateChatResponseModel> call = apiService.initiateContactChat(header, facilityDetailsModel.getUserId(), getApplicationData(getActivity()).getUserID(), 0);
call.enqueue(new Callback<PHCContactInitiateChatResponseModel>() {
#Override
public void onResponse(Call<PHCContactInitiateChatResponseModel> call, Response<PHCContactInitiateChatResponseModel> response) {
Log.d(TAG, "initiateContactChat URL " + response.raw().request().url());
Log.d(TAG, "initiateContactChat Resp " + new Gson().toJson(response.body()));
PHCContactInitiateChatResponseModel mContactInitiateChatModel = response.body();
if (mContactInitiateChatModel != null && mContactInitiateChatModel.getStatusCode() == 1) {
Intent chatIntent = new Intent(getActivity(), PHCChatActivity.class);
// chatIntent.putExtra("headerName",mData.get(groupPosition).getFacilityDetails().get(childPosition).getUserName());
chatIntent.putExtra("headerName", facilityDetailsModel.getUserName());
chatIntent.putExtra("groupId", mContactInitiateChatModel.getData().getGroupId());
getActivity().startActivity(chatIntent);
}
}
#Override
public void onFailure(Call<PHCContactInitiateChatResponseModel> call, Throwable t) {
Toast.makeText(getActivity(), "Something went wrong! Please try again", Toast.LENGTH_SHORT).show();
}
});
}
}
ContactsTabPagerAdapter.java
public class ContactsTabPagerAdapter extends FragmentPagerAdapter {
/**
* The Page count.
*/
final int PAGE_COUNT = 2;
private String[] tabTitles = { "Contacts", "Favorites" };
private ArrayList<PHCContactDetailModel> mContactsList;
private ArrayList<PHCContactDetailModel> mFavoritesList;
Context mContext ;
public ContactsTabPagerAdapter(Context context, FragmentManager fm ,ArrayList<PHCContactDetailModel> contacts , ArrayList<PHCContactDetailModel> favs) {
super(fm);
this.mContext = context;
this.mContactsList = contacts;
this.mFavoritesList=favs;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
ContactsFragment mContactsFragment =new ContactsFragment();
Bundle bundle=new Bundle();
bundle.putSerializable("Contacts", (Serializable) mContactsList);
mContactsFragment.setArguments(bundle);
return mContactsFragment;
case 1:
FavoritesFragment mFavoritesFragment=new FavoritesFragment();
Bundle pastBundle=new Bundle();
pastBundle.putSerializable("Favorites", (Serializable) mFavoritesList);
mFavoritesFragment.setArguments(pastBundle);
return mFavoritesFragment;
}
return null;
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
// Generate title based on item position
return tabTitles[position];
}
/**
* Update.
*
* #param lContactsList contact list to update
* #param lFavoritesList favorites list to update
*/
//call this method to update fragments in ViewPager dynamically
public void update(ArrayList<PHCContactDetailModel> lContactsList, ArrayList<PHCContactDetailModel> lFavoritesList) {
this.mContactsList = lContactsList;
this.mFavoritesList = lFavoritesList;
notifyDataSetChanged();
}
#Override
public int getItemPosition(Object object) {
if (object instanceof UpdatableFragment) {
((UpdatableFragment) object).update(mContactsList, mFavoritesList);
}
//don't return POSITION_NONE, avoid fragment recreation.
return super.getItemPosition(object);
}
}
ContactsFragment.java
public class ContactsFragment extends BaseFragment implements UpdatableFragment{
private static final String TAG = "ContactFragmentTab";
private FloatingGroupExpandableListView mContactExpandableList;
private PHCContactAdapter mAdapter;
WrapperExpandableListAdapter wrapperAdapter;
boolean actionModeEnabled;
private LinearLayout llNoRecords;
private ArrayList<PHCContactDetailModel> mContactsData;
public ContactsFragment() {
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
}
#SuppressWarnings("unchecked")
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_contacts, container, false);
getViewId(rootView);
Bundle bundle= getArguments();
if(bundle !=null)
{
Log.d(TAG, "bundle is not empty");
mContactsData= (ArrayList<PHCContactDetailModel>) bundle.getSerializable("Contacts");
}
System.out.print("Contacts Size::" + mContactsData.size());
if(mContactsData!=null)
{
updateWidgets();
}
return rootView;
}
private void updateWidgets() {
mAdapter = new PHCContactAdapter(getActivity(), mContactsData, new ListShowingHidingListener() {
#Override
public void listHideAndShow(boolean isData) {
if (isData) {
llNoRecords.setVisibility(View.GONE);
mContactExpandableList.setVisibility(View.VISIBLE);
listUpdate();
} else {
llNoRecords.setVisibility(View.VISIBLE);
mContactExpandableList.setVisibility(View.GONE);
}
}
});
wrapperAdapter = new WrapperExpandableListAdapter(mAdapter);
mContactExpandableList.setAdapter(wrapperAdapter);
try {
for (int i = 0; i < wrapperAdapter.getGroupCount(); i++) {
mContactExpandableList.expandGroup(i);
}
} catch (Exception e) {
Log.e("Exception in Expand", "" + e);
}
}
private void listUpdate() {
try {
for (int i = 0; i < wrapperAdapter.getGroupCount(); i++) {
mContactExpandableList.expandGroup(i);
}
} catch (Exception e) {
Log.e("Exception in Expand", "" + e);
}
}
private void getViewId(View view) {
// mContactExpandableList = (ExpandableListView) view.findViewById(R.id.contactList);
mContactExpandableList = (FloatingGroupExpandableListView) view.findViewById(R.id.contactList);
}
#Override
public void update(ArrayList<PHCContactDetailModel> contactsData, ArrayList<PHCContactDetailModel> favoritesData) {
this.mContactsData = contactsData;
updateWidgets();
}
}
similarly i have Favorites example as well. Mostly both will look like same, that's why not posting it here.
Sorry for posting the long question. Any help regarding this. Apologies for my poor English. Thanks in Advance.

ViewPager Text Onclick

I am currently doing this android tutorial https://www.androidhive.info/2016/05/android-build-intro-slider-app/ .
I want to implement the onClick() event inside the viewpager page like if I clicked the text, it will direct me to another page.
Is it possible? If possible, please help me? Thanks
here is my code for viewPager.
public class welcomeActivity extends AppCompatActivity {
ViewPager viewPager;
private LinearLayout myLinear;
private TextView[] dots;
private int[] layouts;
private Button btnSkip, btnNext;
private MyViewPagerAdapter myViewPagerAdapter;
private PrefManager prefManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT >= 21) {
getWindow().getDecorView().
setSystemUiVisibility
(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);}
setContentView(R.layout.activity_welcome);
viewPager = (ViewPager) findViewById(R.id.view_pager);
myLinear = (LinearLayout) findViewById(R.id.layoutDots);
btnSkip = (Button) findViewById(R.id.btn_skip);
btnNext = (Button) findViewById(R.id.btn_next);
layouts = new int[]{
R.layout.slide1, R.layout.slide2, R.layout.slide3, R.layout.slide4, R.layout.slide5
};
addBottomDots(0);
changeStatusBarColor();
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
viewPager.addOnPageChangeListener(viewPagerListener);
btnSkip.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
launchHomeScreen();
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int current = getItem(+1);
if (current < layouts.length){
viewPager.setCurrentItem(current);
}else launchHomeScreen();
}
});
}
ViewPager.OnPageChangeListener viewPagerListener = new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
addBottomDots(position);
if (position == layouts.length -1){
btnSkip.setVisibility(View.GONE);
btnNext.setText("Get Started..");
}
else {
btnNext.setText(getString(R.string.next));
btnSkip.setVisibility(View.VISIBLE);
}
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
}
};
private void addBottomDots(int currentPage) {
dots = new TextView[layouts.length];
int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
myLinear.removeAllViews();
for (int i = 0; i < dots.length; i++) {
dots[i] = new TextView(this);
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorsInactive[currentPage]);
myLinear.addView(dots[i]);
}
if (dots.length > 0)
dots[currentPage].setTextColor(colorsActive[currentPage]);
}
private int getItem(int i) {
return viewPager.getCurrentItem() + i;
}
private void launchHomeScreen() {
//prefManager.setFirstTimeLaunch(false);
startActivity(new Intent(welcomeActivity.this, MainActivity.class));
finish();
}
private void changeStatusBarColor() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
public class MyViewPagerAdapter extends PagerAdapter{
private LayoutInflater inflater;
#Override
public Object instantiateItem(ViewGroup container, int position) {
inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(layouts[position],container,false);
container.addView(v);
return v;
}
#Override
public int getCount() {
return layouts.length;
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view = (View) object;
container.removeView(view);
}
}
}
Here is my layouts. (activity_welcome.xml)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:showIn="#layout/activity_welcome">
<android.support.v4.view.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<LinearLayout
android:id="#+id/layoutDots"
android:layout_width="match_parent"
android:layout_height="#dimen/dots_height"
android:layout_alignParentBottom="true"
android:layout_marginBottom="#dimen/dots_margin_bottom"
android:gravity="center"
android:orientation="horizontal"/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:alpha=".5"
android:layout_above="#id/layoutDots"
android:background="#android:color/white" />
<Button
android:id="#+id/btn_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:background="#null"
android:text="Next"
android:textColor="#android:color/white" />
<Button
android:id="#+id/btn_skip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:background="#null"
android:text="BACK"
android:textColor="#android:color/white" />
</RelativeLayout>
slide1.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/bg_screen1">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center_horizontal"
android:orientation="vertical">
<ImageView
android:layout_width="#dimen/img_width_height"
android:layout_height="#dimen/img_width_height"
android:src="#drawable/ic_food" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/slide_1_title"
android:textColor="#android:color/white"
android:textSize="#dimen/slide_title"
android:textStyle="bold" />
<TextView
android:id="#+id/tvFood"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:paddingLeft="#dimen/desc_padding"
android:paddingRight="#dimen/desc_padding"
android:text="#string/slide_1_desc"
android:textAlignment="center"
android:textColor="#android:color/white"
android:textSize="#dimen/slide_desc" />
</LinearLayout>
</RelativeLayout>
slide2.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/bg_screen2">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center_horizontal"
android:orientation="vertical">
<ImageView
android:layout_width="#dimen/img_width_height"
android:layout_height="#dimen/img_width_height"
android:src="#drawable/ic_movie" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/slide_2_title"
android:textColor="#android:color/white"
android:textSize="#dimen/slide_title"
android:textStyle="bold" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:paddingLeft="#dimen/desc_padding"
android:paddingRight="#dimen/desc_padding"
android:text="#string/slide_2_desc"
android:textAlignment="center"
android:textColor="#android:color/white"
android:textSize="#dimen/slide_desc" />
</LinearLayout>
</RelativeLayout>

After this line in your adapter :
View v = inflater.inflate(layouts[position],container,false);
Add:
TextView tv =(TextView) v.findViewById(R.id.yourTextView);
tv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Do your stuff here whatever you want to do upon click
}});

public class IntroFragment_1 extends Fragment {
private String title;
private int page;
ImageView intro_images_1;
Animation xmlAnimationSample;
// newInstance constructor for creating fragment with arguments
public static IntroFragment_1 newInstance(int page, String title) {
IntroFragment_1 fragmentFirst = new IntroFragment_1();
Bundle args = new Bundle();
args.putInt("someInt", page);
args.putString("someTitle", title);
fragmentFirst.setArguments(args);
return fragmentFirst;
}
// Store instance variables based on arguments passed
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
page = getArguments().getInt("someInt", 0);
title = getArguments().getString("someTitle");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.intro_view_1, container, false);
intro_images_1 = view.findViewById(R.id.intro_images_1);
xmlAnimationSample = AnimationUtils.loadAnimation(getContext(),R.anim.zoom_intro);
intro_images_1.startAnimation(xmlAnimationSample);
return view;
}
}
MyViewPagerAdapter
public static class MyViewPagerAdapter extends FragmentPagerAdapter {
private static int NUM_ITEMS = 3;
public MyViewPagerAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
// Returns total number of pages
#Override
public int getCount() {
return NUM_ITEMS;
}
// Returns the fragment to display for that page
#Override
public Fragment getItem(int position) {
switch (position) {
case 0: // Fragment # 0 - This will show FirstFragment
return IntroFragment_1.newInstance(0, "Page # 1");
case 1: // Fragment # 0 - This will show FirstFragment different title
return IntroFragment_1.newInstance(0, "Page # 1");
case 2: // Fragment # 1 - This will show SecondFragment
return IntroFragment_1.newInstance(0, "Page # 1");
default:
return null;
}
}
// Returns the page title for the top indicator
#Override
public CharSequence getPageTitle(int position) {
return "Page " + position;
}
}
layouts = new int[]{0, 1, 2,};

App crash when rotating tablet (single to dual pane display)

Ive tried to solve my Portrait/Landscape segment in my project using this tutorial:
http://www.cs.dartmouth.edu/~campbell/cs65/lecture09/lecture09.html
Everything seems to work fine (both landscape and portrait), but if i rotate from portrait to landscape or visa verse the app crashes with this: error
11-26 13:42:38.822 22594-22594/picturedtalk.com.picturedtalk E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: picturedtalk.com.picturedtalk, PID: 22594
java.lang.RuntimeException: Unable to start activity ComponentInfo{picturedtalk.com.picturedtalk/picturedtalk.com.picturedtalk.Signs.SignActivity}: android.app.Fragment$InstantiationException: Unable to instantiate fragment picturedtalk.com.picturedtalk.Signs.DetailsFragment: make sure class name exists, is public, and has an empty constructor that is public
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2338)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3930)
at android.app.ActivityThread.access$900(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment picturedtalk.com.picturedtalk.Signs.DetailsFragment: make sure class name exists, is public, and has an empty constructor that is public
at android.app.Fragment.instantiate(Fragment.java:601)
at android.app.FragmentState.instantiate(Fragment.java:98)
at android.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1759)
at android.app.Activity.onCreate(Activity.java:899)
at picturedtalk.com.picturedtalk.Signs.SignActivity.onCreate(SignActivity.java:16)
Any suggestion how i can stop the app from crashing when changing from portrait to landscape view?
That part of my app:
SignActivity.java
public class SignActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.signs_layout);
}
}
ListFragment.java
public class ListFragment extends android.app.ListFragment {
private ArrayList<Signs> storage;
boolean mDualPane;
int mCurrentCheckPosition = 0;
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
SignAdapter adapter = new
SignAdapter(Storage.get(getActivity()).getStorageOfSigns());
setListAdapter(adapter);
//Check if the we are using layout-land version of the XML to figure out if
portrait/landscape
View detailsFrame = getActivity().findViewById(R.id.details);
mDualPane = detailsFrame != null && detailsFrame.getVisibility() == View.VISIBLE;
//restore last state
if (savedInstanceState != null) {
mCurrentCheckPosition = savedInstanceState.getInt("curChoice", 0);
}
if (mDualPane) {
//only select one item at the time
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
showDetails(mCurrentCheckPosition);
} else {
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
getListView().setItemChecked(mCurrentCheckPosition, true);
}
}
//Handle flipping during fragment use
//DOES NOT WORK
#Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putInt("curChoice", mCurrentCheckPosition);
}
private void showDetails(int index) {
mCurrentCheckPosition = index;
if (mDualPane) {
getListView().setItemChecked(index, true);
DetailsFragment details = (DetailsFragment) getFragmentManager().findFragmentById(R.id.details);
if (details == null || details.getShownIndex() != index) {
UUID startId = ((SignAdapter) getListAdapter()).getItem(0).getId();
details = new DetailsFragment(startId);
// Execute a transaction, replacing any existing fragment
// with this one inside the frame.
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.details, details);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
} else {
Intent intent = new Intent();
intent.setClass(getActivity(), DetailsActivity.class);
intent.putExtra("index", index);
startActivity(intent);
}
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
if(!mDualPane){
Signs signs = ((SignAdapter) getListAdapter()).getItem(position);
Intent intent = new Intent(getActivity(),
picturedtalk.com.picturedtalk.Signs.DetailsActivity.class);
intent.putExtra(DetailsFragment.EXTRA_SIGN_ID, signs.getId());
startActivity(intent);
}
else{
UUID signId = ((SignAdapter) getListAdapter()).getItem(position).getId();
DetailsFragment fragment = new DetailsFragment(signId);
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.details, fragment);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
}
private class SignAdapter extends ArrayAdapter<Signs> {
public SignAdapter(ArrayList<Signs> sSigns) {
super(getActivity(), 0, sSigns);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
//If we were given a view, inflate one
if (convertView == null) {
convertView = getActivity().getLayoutInflater().inflate(R.layout.signs_row,
null);
}
//Configure the view for this Crime
Signs signs = getItem(position);
TextView titleTextView = (TextView) convertView.findViewById(R.id.label);
titleTextView.setText(signs.getName());
return convertView;
}
}}
DetailsActivity.java
public class DetailsActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
UUID mSignId;
mSignId = (UUID)getIntent().getSerializableExtra(DetailsFragment.EXTRA_SIGN_ID);
DetailsFragment details = new DetailsFragment(mSignId);
getFragmentManager().beginTransaction().replace(android.R.id.content, details).commit();
UUID STOPTHIs = mSignId;
}
else {
UUID mSignId;
mSignId = (UUID)getIntent().getSerializableExtra(DetailsFragment.EXTRA_SIGN_ID);
DetailsFragment details = new DetailsFragment(mSignId);
getFragmentManager().beginTransaction().add(android.R.id.content, details).commit();
}
}}
DetailsFragment.java
public class DetailsFragment extends Fragment {
public int getShownIndex() {
return getArguments().getInt("index", 0);
}
public static final String EXTRA_SIGN_ID = "sign_id";
private UUID extraSignId;
// private static DetailsFragment detailsFragment;
private View view;
private TextView title;
private ImageView illustrativeView;
private ImageView pictureView;
private VideoView videoView;
private Signs mSign;
private String TAG = "DETAILFRAGMENT";
public DetailsFragment(UUID signId) {
this.extraSignId = signId;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mSign = Storage.get(getActivity()).getSigns(extraSignId);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.signs_details, container, false);
title = (TextView) view.findViewById(R.id.title);
illustrativeView = (ImageView) view.findViewById(R.id.illustrateImage);
pictureView = (ImageView) view.findViewById(R.id.pictureImage);
videoView = (VideoView) view.findViewById(R.id.videoView);
title.setText(mSign.getName());
try {
Bitmap illuBitmap = BitmapFactory.decodeFile(mSign.getIllustrativeURL());
illustrativeView.setImageBitmap(illuBitmap);
} catch (Exception e) {
Log.d(TAG, "failed loading illustrative image");
}
try {
Bitmap picBitmap = BitmapFactory.decodeFile(mSign.getImageURL());
pictureView.setImageBitmap(picBitmap);
} catch(Exception e){
Log.d(TAG, "failed loading picture image");
}
try {
Uri uri = Uri.parse(mSign.getVideoURL());
videoView.setVideoURI(uri);
videoView.requestFocus();
videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer mp) {
mp.setLooping(true);
}
});
videoView.setOnErrorListener(new MediaPlayer.OnErrorListener() {
#Override
public boolean onError(MediaPlayer mp, int what, int extra) {
videoView.setBackgroundResource(R.drawable.simp);
return true;
}
});
videoView.start();
} catch (Exception e) {
Log.d(TAG, "failed loading video");
}
return view;
}}
Signs.java
public class Signs {
UUID id;
String name;
String videoURL;
String imageURL;
String illustrativeURL;
public Signs(String name, String imageURL,String videoURL, String illustrativeURL){
this.id = UUID.randomUUID();
this.name = name;
this.videoURL = videoURL;
this.imageURL = imageURL;
this.illustrativeURL = illustrativeURL;
}
public UUID getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getVideoURL() {
return videoURL;
}
public void setVideoURL(String videoURL) {
this.videoURL = videoURL;
}
public String getImageURL() {
return imageURL;
}
public void setImageURL(String imageURL) {
this.imageURL = imageURL;
}
public String getIllustrativeURL() {
return illustrativeURL;
}
public void setIllustrativeURL(String illustrativeURL) {
this.illustrativeURL = illustrativeURL;
}}
signs_layout.xml (layout)
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<fragment
android:id="#+id/titles"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="picturedtalk.com.picturedtalk.Signs.ListFragment" />
signs_layout.xml (/layout-land)
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="false"
android:orientation="horizontal" >
<fragment
android:id="#+id/titles"
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="1"
class="picturedtalk.com.picturedtalk.Signs.ListFragment" />
<FrameLayout
android:id="#+id/details"
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="3"
android:background="?android:attr/detailsElementBackground" />
</LinearLayout>
signs_details.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="50dp"
android:text="TitleHere"
android:id="#+id/title"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="98dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/illustrateImage"
android:layout_below="#id/title"
android:layout_toRightOf="#+id/pictureImage"
android:background="#drawable/signs_logo"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/pictureImage"
android:layout_centerVertical="true"
android:layout_below="#+id/title"
android:layout_centerHorizontal="true"
android:background="#drawable/simp"/>
<VideoView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/videoView"
android:layout_below="#id/title"
android:layout_toLeftOf="#+id/pictureImage"/>
</RelativeLayout>
signs_listview.xml
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/listview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
signs_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#+id/label"
android:textSize="20px" >
</TextView>
</LinearLayout>

You can avoid activity recreation by adding following to your application's manifest file.
as
android:configChanges="keyboardHidden|orientation|screenSize"
and
<activity
android:name=".your activity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/app_name" >
</activity>

how can I find the button of my activity in fragment

Just started learning android. Help please. I have three fragments, each has a button that must run one of the streams of the media player. How can I find the button of my activity in the fragment that would later attach to it a specific stream?
Tried to make a reference to the button so that:
btnStart = (Button) titleAdapter.frags[0].getView().findViewById(R.id.btnStart);
Did not work, an error java.lang.NullPointerException, what I'm doing wrong
public class TitleAdapter extends FragmentPagerAdapter {
private final String titles[] = new String[] { "FragA", "FragB", "FragC" };
private final Fragment frags[] = new Fragment[titles.length];
public TitleAdapter(FragmentManager fm) {
super(fm);
frags[0] = new FragmentA();
frags[1] = new FragmentB();
frags[2] = new FragmentC();
}
#Override
public CharSequence getPageTitle(int position) {
Log.v("TitleAdapter - getPageTitle=", titles[position]);
return titles[position];
}
#Override
public Fragment getItem(int position) {
Log.v("TitleAdapter - getItem=", String.valueOf(position));
return frags[position];
}
#Override
public int getCount() {
return frags.length;
}
}
code MainActivity.java:
public class MainActivity extends FragmentActivity {
final static String LOG_TAG = "myLogs";
static MediaPlayer mediaPlayer;
static AudioManager am;
static CheckBox pdaStream;
static Button btnNews;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mViewPager = (ViewPager) findViewById(R.id.pager);
TitleAdapter titleAdapter = new TitleAdapter(getSupportFragmentManager());
mViewPager.setAdapter(titleAdapter);
mViewPager.setCurrentItem(1);
mViewPager.setOffscreenPageLimit(2);
pdaStream = (CheckBox) findViewById(R.id.pdaStream);
am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
SeekBar music = (SeekBar)findViewById(R.id.seekBar1);
initBar(music, AudioManager.STREAM_MUSIC);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.news:
Intent intent = new Intent(this, RSSActivity.class);
startActivity(intent);
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
public static void initBar(SeekBar bar, final int stream) {
bar.setMax(am.getStreamMaxVolume(stream));
bar.setProgress(am.getStreamVolume(stream));
bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
public void onProgressChanged(SeekBar bar, int progress,
boolean fromUser) {
am.setStreamVolume(stream, progress,
AudioManager.FLAG_PLAY_SOUND);
}
public void onStartTrackingTouch(SeekBar bar) {
// no-op
}
public void onStopTrackingTouch(SeekBar bar) {
// no-op
}
});
}
}
code fragments similar, here's one of them
code FragmentA.java:
public class FragmentA extends Fragment {
final static String LOG_TAG = "myLogs";
private static ProgressBar progressBar;
static CheckBox pdaStream;
public FragmentA() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_a, container, false);
final Button Play = (Button) rootView.findViewById(R.id.btnStart);
progressBar = (ProgressBar) rootView.findViewById(R.id.progressBar);
progressBar.setVisibility(View.GONE);
pdaStream = (CheckBox) getActivity().findViewById(R.id.pdaStream);
return rootView;
} }
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/background"
tools:context=".MainActivity" >
<android.support.v4.view.PagerTabStrip
android:id="#+id/pager_title_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="#drawable/bg_pager"
android:paddingBottom="4dp"
android:paddingTop="4dp"
android:textColor="#fff" />
</android.support.v4.view.ViewPager>
<SeekBar
android:id="#+id/seekBar1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="60dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:thumb="#drawable/seek" />
<CheckBox
android:id="#+id/pdaStream"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="70dp"
android:text="#string/chkbox" />
</RelativeLayout>
fragment_a.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="#+id/btnStart"
android:layout_width="70dp"
android:layout_height="70dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:textSize="16sp"
android:onClick="onClick"
android:background="#drawable/play_button"/>
<ProgressBar
android:id="#+id/progressBar"
style="?android:attr/progressBarStyleLarge"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
</RelativeLayout>

You can access like this, for example you want access to button of fragment frags[1]:
Button btnFragment = frags[1].getView().findViewById(R.id.yourButtonID);
hope it helps!

You have to pass a reference from your Activity to the Fragments. As you are creating the Fragments from your PagerAdapter, it has to have the reference as well. You can do this either in the constructor (new Fragment(Activity a)) or by a public variable Activity that you initalize from the activity after creating the PagerAdapter.
in the Activity:
x = new TitleAdapter();
x.mActivity = this; (while mActivity must be declared public in the TitleAdapter()
in the Adapter:
frags[0] = new FragmentA();
frags[0].mActivity = this.mActivity;
Then in your Fragment you can add a OnClickListener to your button.

CirclePageIndicator on top of ViewPager

In my layout I am trying to get the CirclePageIndicator to sit at the bottom of my image and for my image to be aligned at the top of the screen. Whatever I try it doesn't work. Here is how I want it to look like:
What it ends up looking like is this
Here is my code for this.
<RelativeLayout android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:layout_gravity="top">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="3dp"/>
<com.viewpagerindicator.CirclePageIndicator
android:id="#+id/indicator"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/pager"/>
</RelativeLayout>
And because it is a ViewPager I added the ability to scroll through each image. Here is the code for that.
public class SectionsPagerAdapter extends FragmentPagerAdapter {
private int[] Images = new int[] { R.drawable.homephoneicon1, R.drawable.homephoneicon2,
R.drawable.homephoneicon3, R.drawable.homephoneicon4, R.drawable.homephoneicon5};
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return SlideshowFragment.newInstance(Images[position]);
}
#Override
public int getCount() {
return NUM_SLIDES;
}
}
Here is the Slideshow code
public class SlideshowFragment extends Fragment {
int imageResourceId;
public static SlideshowFragment newInstance(int i) {
SlideshowFragment fragment = new SlideshowFragment();
fragment.imageResourceId = i;
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
ImageView image = new ImageView(getActivity());
image.setImageResource(imageResourceId);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
LinearLayout layout = new LinearLayout(getActivity());
layout.setLayoutParams(new LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
layout.setGravity(Gravity.TOP);
layout.addView(image, params);
return layout;
}
}
Thanks for any help!

Here is how I did it
Code
public static SlideshowFragment newInstance(int i) {
SlideshowFragment fragment = new SlideshowFragment();
fragment.imageResourceId = i;
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
ImageView image = new ImageView(getActivity());
image.setImageResource(imageResourceId);
image.setScaleType(ImageView.ScaleType.FIT_XY);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
RelativeLayout layout = new RelativeLayout(getActivity());
layout.setLayoutParams(new LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT));
layout.addView(image, params);
return layout;
}
Layout
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1.5">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<com.viewpagerindicator.CirclePageIndicator
android:id="#+id/indicator"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:padding="5dp"
android:layout_alignParentBottom="true"/>
</RelativeLayout>

late comer but seems a better workaround
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="#dimen/height"/>
<com.viewpagerindicator.CirclePageIndicator
android:id="#+id/indicator"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:padding="5dp"
android:layout_alignBottom="#+id/pager"/>

activity_main.xml:-
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="fill_parent"
android:background="#ffffff"
android:layout_height="300dp">
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="300dp"></android.support.v4.view.ViewPager>
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="10dp"
android:background="#android:color/transparent"
android:gravity="center_horizontal"
android:textSize="50sp" />
</RelativeLayout>
view_pager_item.xml:-
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/pagerItem"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textAlignment="center" />
</RelativeLayout>
ViewPagerAdapter.java:-
public class ViewPagerAdapter extends PagerAdapter {
Context con;
String[] data;
public ViewPagerAdapter(Context con, String[] data) {
this.data = data;
this.con = con;
}
#Override
public int getCount() {
return data.length;
}
#Override
public boolean isViewFromObject(View view, Object o) {
return view == o;
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
LayoutInflater inflater = (LayoutInflater) con.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.view_pager_item, container, false);
try {
TextView textView = (TextView) view.findViewById(R.id.pagerItem);
textView.setText(data[position]);
((ViewPager) container).addView(view);
} catch (Exception ex) {
ex.printStackTrace();
}
return view;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((RelativeLayout) object);
}
}
MainActivity.java:-
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
try {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String[] data = new String[]{
"page 1",
"page 2",
"page 3",
"page 4"
};
final ViewPagerAdapter adapter = new ViewPagerAdapter(this, data);
final ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
viewPager.setOffscreenPageLimit(2);
viewPager.setAdapter(adapter);
final TextView textView = (TextView) findViewById(R.id.textView);
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
textView.setText("");
for (int i = 0; i < adapter.getCount(); i++) {
Spannable word = new SpannableString(" " + ".");
if (i == position) {
word.setSpan(new ForegroundColorSpan(Color.RED), 0, word.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
} else {
word.setSpan(new ForegroundColorSpan(Color.BLUE), 0, word.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
textView.append(word);
}
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
} catch (Exception ex) {
ex.printStackTrace();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

Simple way import pagerlibrary and use this code into .xml file.
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_above="#+id/twoImage"
android:id="#+id/slideLay"
>
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/offer_pager"
/>
<com.viewpagerindicator.CirclePageIndicator
android:id="#+id/page_indicatorr"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#null"
app:fillColor="#000000"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginBottom="10dp"
android:padding="5dip"
>
</com.viewpagerindicator.CirclePageIndicator>
</RelativeLayout>

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

how to find the button in the fragment of Activity - android

use following code in onActivityCreated() of fragment btnStart = (Button) getView().findViewById(R.id.btnStart);

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how can I find the button of my activity in fragment

CirclePageIndicator on top of ViewPager

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