Develop Reference

Change Fragment in a tabbed Activity with a Button

I'm developing an application in which I have to implement a function that allows to me to change a Fragment with a Button instead of crawling the site on the screen.
Tutorial.java
public class Tutorial extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tutorial_main);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
return super.onOptionsItemSelected(item);
}
PlaceholderFragment.java
public static class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {}
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_tutorial, container, false);
Button next = (Button) rootView.findViewById(R.id.next);
Button previous = (Button) rootView.findViewById(R.id.previous);
RelativeLayout rl = (RelativeLayout) rootView.findViewById(R.id.relative_tutorial);
switch (getArguments().getInt(ARG_SECTION_NUMBER)){
case 1:
rl.setBackgroundResource(R.drawable.one);
previous.setText("ESCI");
previous.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getActivity().finish();
}
});
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
}
});
break;
case 2:
rl.setBackgroundResource(R.drawable.two);
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
}
});
break;
case 3:
rl.setBackgroundResource(R.drawable.three);
next.setText("HOME");
next.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getActivity().finish();
Intent intent = new Intent(getContext(), MainActivity.class);
startActivity(intent);
}
});
break;
}
return rootView;
}
}
SectionsPagerAdapter.java
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return PlaceholderFragment.newInstance(position + 1);
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
}
return null;
}
}
}
How I can switch "page" by clicking my Button, instead of crawling the site on the screen?

This is how you display another fragment. So, just put this code inside your buttons onclick method.
Example:
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(android.R.id.content, new Fragment_1(), "frag1");
fragmentTransaction.commit();

Options menu is getting cleared in view pager android?

I am using options menu in action bar tabs,view pager and nested fragments, when i switch from fragmentA to fragmentB using tabs menu items are working fine, but when i try to swith using view pager option items are getting invisble in fragments.
public class RTHomeTabFragment extends Fragment implements TabListener,OnBackButtonPressInterfaceForFragment{
public ActionBarActivity parentActivity;
private ActionBar actionBar;
ViewPager mViewPager;
public static int currentPage;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
RTMessagingUtils.log(getClass().getName(), "onCreateView");
View view = inflater.inflate(R.layout.viewpager_tabs, container,false);
parentActivity = (ActionBarActivity) getActivity();
actionBar = parentActivity.getSupportActionBar();
mViewPager = (ViewPager) view.findViewById(R.id.pager);
/* actionBar.setDisplayShowTitleEnabled(false);
actionBar.setDisplayShowHomeEnabled(false);*/
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setCustomView(null);
actionBar.removeAllTabs();
List<Fragment> fragments = getFragments();
pagerAdapter adapter = new pagerAdapter(getChildFragmentManager(), getFragments());
mViewPager.setAdapter(adapter);
currentPage=mViewPager.getCurrentItem();
Log.d("TestFragments", "currentPage======"+currentPage);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
currentPage=mViewPager.getCurrentItem();
Log.d("TestFragments", "currentPage======"+currentPage);
}
});
for (int i = 0; i < adapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab().setText(adapter.getPageTitle(i)).setTabListener(this));
}
return view;
}
private List<Fragment> getFragments(){
List<Fragment> fList = new ArrayList<Fragment>();
// add fragments here
fList.add(new Test1());
fList.add(new Test2());
fList.add(new Test3());
return fList;
}
class pagerAdapter extends FragmentPagerAdapter{
private List<Fragment> fragments;
public pagerAdapter(FragmentManager fm, List<Fragment> fragments){
super(fm);
this.fragments = fragments;
}
#Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
#Override
public int getCount() {
return this.fragments.size();
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.db_jio_chat_chats).toUpperCase(l);
case 1:
return getString(R.string.db_jio_chat_groups).toUpperCase(l);
case 2:
return getString(R.string.db_jio_chat_contacts).toUpperCase(l);
/*case 3:
return getString(R.string.db_jio_chat_my_profile).toUpperCase(l);
case 4:
return getString(R.string.db_jio_chat_location).toUpperCase(l);
case 5:
return getString(R.string.db_jio_chat_about).toUpperCase(l);*/
}
return null;
}
}
#Override
public void onTabReselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
// setHasOptionsMenu(true);
super.onCreate(savedInstanceState);
}
#Override
public void onTabSelected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
mViewPager.setCurrentItem(arg0.getPosition());
}
#Override
public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {
// TODO Auto-generated method stub
}
#Override
public void onResume() {
super.onResume();
RTMessagingUtils.log(getClass().getName(), "onResume");
}
#Override
public void onPause() {
super.onPause();
RTMessagingUtils.log(getClass().getName(), "onPause");
}
}

In your getItem method do this for testing :
#Override
public Fragment getItem(int position) {
if(position == 0)
return new Test1();
else
return new Test2();
}
and see if this works, I will find an explanation later if it works...

android add setOnClickListener function in view pager fragment

i have a fragment activity which has 4 child fragments ....
i've success to add swipe function (sliding), but i don't know how to add setOnClickListener function when i click tab menu, i want my app can provide 2 ways to access an activity (sliding page and click tab menu)....how can i do that?
thank in advance
this is my MainActivity
public class ViewPagerStyle1Activity extends FragmentActivity {
private ViewPager _mViewPager;
private ViewPagerAdapter _adapter;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setUpView();
setTab();
}
private void setUpView(){
_mViewPager = (ViewPager) findViewById(R.id.viewPager);
_adapter = new ViewPagerAdapter(getApplicationContext(),getSupportFragmentManager());
_mViewPager.setAdapter(_adapter);
_mViewPager.setCurrentItem(0);
}
private void setTab(){
_mViewPager.setOnPageChangeListener(new OnPageChangeListener(){
#Override
public void onPageScrollStateChanged(int position) {}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {}
#Override
public void onPageSelected(int position) {
// TODO Auto-generated method stub
switch(position){
case 0:
findViewById(R.id.first_tab).setVisibility(View.VISIBLE);
findViewById(R.id.second_tab).setVisibility(View.INVISIBLE);
break;
case 1:
findViewById(R.id.first_tab).setVisibility(View.INVISIBLE);
findViewById(R.id.second_tab).setVisibility(View.VISIBLE);
break;
}
}
});
}
}
and this is my ViewPagerAdapter
public class ViewPagerAdapter extends FragmentPagerAdapter {
private Context _context;
public ViewPagerAdapter(Context context, FragmentManager fm) {
super(fm);
_context=context;
}
#Override
public Fragment getItem(int position) {
Fragment f = new Fragment();
switch(position){
case 0:
f=LayoutOne.newInstance(_context);
break;
case 1:
f=LayoutTwo.newInstance(_context);
break;
}
return f;
}
#Override
public int getCount() {
return 2;
}
}

Android findViewById not working in ViewPager

New and working on ViewPager, and encounter some difficulties that would like you to offer some advice...
ViewPagerAdapter class
public class ViewPagerAdapter extends FragmentPagerAdapter
{
private Context _context;
public ViewPagerAdapter(Context context, FragmentManager fm)
{
super(fm);
_context=context;
}
#Override
public Fragment getItem(int position)
{
Fragment f = new Fragment();
switch(position){
case 0:
f=App_Intro.newInstance(_context);
break;
case 1:
f=LayoutTwo.newInstance(_context);
break;
}
return f;
}
#Override
public int getCount()
{
return 2;
}
}
ViewPagerStyle1Activity class
public class ViewPagerStyle1Activity extends FragmentActivity
{
private ViewPager _mViewPager;
private ViewPagerAdapter _adapter;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setUpView();
setTab();
}
private void setUpView()
{
_mViewPager = (ViewPager) findViewById(R.id.viewPager);
_adapter = new ViewPagerAdapter(getApplicationContext(),getSupportFragmentManager());
_mViewPager.setAdapter(_adapter);
_mViewPager.setCurrentItem(0);
}
private void setTab()
{
_mViewPager.setOnPageChangeListener(new OnPageChangeListener()
{
#Override
public void onPageScrollStateChanged(int position) {}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {}
#Override
public void onPageSelected(int position)
{
// TODO Auto-generated method stub
switch(position)
{
case 0:
findViewById(R.id.first_tab).setVisibility(View.VISIBLE);
findViewById(R.id.second_tab).setVisibility(View.INVISIBLE);
break;
case 1:
findViewById(R.id.first_tab).setVisibility(View.INVISIBLE);
findViewById(R.id.second_tab).setVisibility(View.VISIBLE);
break;
}
}
});
}
}
App_Intro class
public class App_Intro extends Fragment
{
public static Fragment newInstance(Context context)
{
App_Intro f = new App_Intro();
return f;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState)
{
ViewGroup root = (ViewGroup) inflater.inflate(R.layout.app_introduce_scroll, null);
Button calpaidBtn = (Button) findViewById(R.id.calpaidBtn); //RED UNDERLINE ERROR
calpaidBtn.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Intent intent = new Intent (Intent.ACTION_VIEW,
Uri.parse("https://abc.com"));
startActivity(intent);
return;
}
});
return root;
}
}
Question:
It underlines red in the App_Intro class for findViewById that "The method findViewById(int) is undefined for the type App_Intro"
How does this be solved? Actually how to put different activities into the ViewPager? Are there any examples?
Many thanks in advance!

Use the following :
root.findViewById(..)

code button inflater

I have this main activity
public class MainActivity extends FragmentActivity {
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.activity_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.menu_settings4:
mainactivity();
return true;
case R.id.menu_settings1:
ipallilos();
return true;
case R.id.menu_settings2:
rithmisi();
return true;
case R.id.menu_settings3:
sxetika();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void mainactivity() {
Toast.makeText(MainActivity.this, "Επιστροφή στην Αρχική Σελίδα",
Toast.LENGTH_SHORT).show();
}
private void rithmisi() {
setContentView(R.layout.rithmisis);
Toast.makeText(MainActivity.this, "Loading Settings",
Toast.LENGTH_SHORT).show();
}
private void ipallilos() {
setContentView(R.layout.ipallilos);
Toast.makeText(MainActivity.this, "Loading Staff",
Toast.LENGTH_SHORT).show();
}
private void sxetika() {
//anoigma menou efarmogis
setContentView(R.layout.sxetikame);
Toast.makeText(MainActivity.this, "Loading about Software",
Toast.LENGTH_SHORT).show();
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
//moveTaskToBack(true);
super.onBackPressed();
return true;
}
return super.onKeyDown(keyCode, event);
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
#Override
public int getCount() {
// Show 3 total pages.
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase();
// case 1:
// return getString(R.string.title_section2).toUpperCase();
case 1:
return getString(R.string.title_section3).toUpperCase();
}
return null;
}
}
public static class DummySectionFragment extends Fragment {
public DummySectionFragment() {
}
public static final String ARG_SECTION_NUMBER = "section_number";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Bundle args = getArguments();
switch (args.getInt(ARG_SECTION_NUMBER)){
case 1:
return inflater.inflate(R.layout.paraggeleialayout, container, false);
case 2:
return inflater.inflate(R.layout.trapezia, container, false);
}
return getView();
}
}
}
I have at .paraggeleialayout some buttons.
I have try to add setOnClickListener to my button to open an other class but it does not
work. Here is my paraggeleia class.
public class paraggeleia extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.paraggeleialayout);
TextView text = (TextView) findViewById(R.id.TextView1);
Button bTutorial = (Button) findViewById(R.id.button51);
text.setText(R.string.paraggeleia);
bTutorial.setOnClickListener(new View.OnClickListener() {
public void onClick(View v){
finish();
}
});
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
super.onBackPressed();
return true;
}
return super.onKeyDown(keyCode, event);
}
}

Alright, I think this is clearer now, so you want your ViewPager layout to launch the next Activity. You may want to do something like this:
case 1:
View v = inflater.inflate(R.layout.paraggeleialayout, container, false);
Button bTutorial = (Button) v.findViewById(R.id.button51);
bTutorial.setOnClickListener(new View.OnClickListener() {
public void onClick(View v){
getActivity().startActivity(new Intent (getActivity(), paraggeleia.class));
}
});
return v;
However your paraggeleia.class as it stands contains the same layout (R.layout.paraggeleialayout) as the Fragment, so consider changing that Activity's layout to something else.