My FragmentActivity loops and creates numerous Fragments, each with `new TextView. After some help, I have this:
FragmentActivity.java
...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
for (int j=0; j<positionsCount; j++) {
...
mTabsAdapter = new PositionFragmentAdapter(this, mViewPager);
mTabsAdapter.addTab(bar.newTab().setText("My Tab Name"), Fragment.class, args);
}
}
Fragment.java
public class Fragment extends Fragment {
private static int id = 0;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
LinearLayout mLinearLayout = new LinearLayout(getActivity());
TextView mTextView = new TextView(getActivity());
mTextView.setId(id);
id++;
mLinearLayout.addView(mTextView);
return mLinearLayout;
}
#Override
public void onStart() {
super.onStart();
Bundle args = getArguments();
id.setText(args.get("posName").toString()); // ERROR HERE: "Cannot invoke setText(String) from primitive type int"
}
}
How can I stop the error?
Edit 2:
06-11 12:54:53.843: E/AndroidRuntime(21005): java.lang.NullPointerException
06-11 12:54:53.843: E/AndroidRuntime(21005): at com.example.guide.Fragment.onStart(Fragment.java:33)
06-11 12:54:53.843: E/AndroidRuntime(21005): at android.support.v4.app.Fragment.performStart(Fragment.java:1484)
...
You're calling setText on an integer, not a TextView. Instead of this
id.setText(args.get("posName").toString());
do this:
mTextView.setText(args.get("posName").toString());
Note that you will have to make your TextView an instance variable of the Fragment, so that it'll be accessible from other methods.
public class Fragment extends Fragment {
TextView mTextView;
Related
MainActivity on startup add a fragment layout to Relativeview, then i send a data to fragment to add it to ExpandablelistView but my app shows me error that couldn't recognize ExpandablelistView.
MainActivity:
public class MainActivity extends AppCompatActivity implements FragmentAddCatergory.onClickButtonListener {
private FragmentManager manager;
private FragmentTransaction transactionShowList;
private FragmentTransaction transactionAddCatergory;
private FragmentAddCatergory addCatergory;
private FragmentShowCategory showCategory;
private boolean addcategory;
private TextView txtAddCategory;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
manager = getFragmentManager();
transactionShowList = manager.beginTransaction();
showCategory = new FragmentShowCategory();
addCatergory=new FragmentAddCatergory();
transactionShowList.add(R.id.Fragment_container, showCategory);
transactionShowList.commit();
addcategory=false;
txtAddCategory = (TextView) findViewById(R.id.txtaddcategory);
txtAddCategory.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ChangeFragment();
}
});
}
public void ChangeFragment(){
transactionAddCatergory=manager.beginTransaction();
if (addcategory){
transactionAddCatergory.replace(R.id.Fragment_container,addCatergory);
txtAddCategory.setText("Do you want to see your List?Show me!");
addcategory=false;
}else{
transactionAddCatergory.replace(R.id.Fragment_container,showCategory);
txtAddCategory.setText("Do you want to add a Category?Create One");
addcategory=true;
}
transactionAddCatergory.commit();
}
#Override
public void ClickButton(String group, String child) {
FragmentShowCategory a=new FragmentShowCategory();
a.showExpand(this,group,child);
}}
in last above code i make object from first fragment and send a data and in below code is code of first fragment
public class FragmentShowCategory extends Fragment {
private View view;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
view = inflater.inflate(R.layout.activity_expandable_list_view, container, false);
return view;
}
public void showExpand(Context context, String g, String c) {
Toast.makeText(context, g + " is " + c, Toast.LENGTH_LONG).show();
HashMap<String, List<String>> carsDetails = DataProvider.getInfo(g, c);
List<String> carsBrands = new ArrayList<String>(carsDetails.keySet());
ItemClass adapter = new ItemClass(context, carsDetails, carsBrands);
ExpandableListView list = (ExpandableListView) view.findViewById(R.id.expandList);
list.setAdapter(adapter);
}}
but when i ran my app, i get error that i don't know why in line of:
ExpandableListView list = (ExpandableListView) view.findViewById(R.id.expandList);
i'd appreciate to help me.
Your fragment's view hierarchy is not inflated automatically just because you created an instance of your fragment, as you do in ClickButton. The onCreateView() method that has to be called first in order to inflate your views is part of the fragment's lifecycle. You should let Android instantiate your fragment, and acquire it's instance through the FragmentManager.
This tutorial explains basics about fragments very well.
I'm more googling to find how can i pass simple view as an object to fragment, but i can't.
for example in MainActivity i have simple view as :
TextView text = (TextView) findviewById(R.id.tv_text);
now i want to pass that to fragment. this below code is my attach Fragment on MainActivity
MainActivity :
public void attachFragment() {
fts = getActivity().getFragmentManager().beginTransaction();
mFragment = new FragmentMarketDetail();
fts.replace(R.id.cardsLine, mFragment, "FragmentMarketDetail");
fts.commit();
}
and this is my Fragment:
public class FragmentMarketDetail extends Fragment implements ObservableScrollViewCallbacks {
public static final String SCROLLVIEW_STATE = "scrollviewState";
private ObservableScrollView scrollViewTest;
private Context context;
private int scrollY;
public static FragmentMarketDetail newInstance() {
FragmentMarketDetail fragmentFirst = new FragmentMarketDetail();
return fragmentFirst;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_online_categories, container, false);
scrollViewTest = (ObservableScrollView) view.findViewById(R.id.scrollViewTest);
scrollViewTest.setScrollViewCallbacks(this);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = getActivity().getBaseContext();
}
}
It wouldn't be good practise to pass a view that way. If you want to access the view in your activity from within your fragment class, use getActivity() to access the activity to which your fragment is attached, and from there you find your TextView.
TextView text = (TextView) getActivity().findViewById(R.id.tv_text);
How about adding a set function in your custom fragment
e.g.
public void setTextView(TextView tv){
this.tv = tv
}
and then calling it after
mFragment = new FragmentMarketDetail();
mFragment.setTextView(textView)
Find fragment by tag and invoke a function on it:
mFragment = (FragmentMarketDetail ) getActivity().getFragmentManager().findFragmentByTag(FragmentMarketDetail .class.getSimpleName());
mFragment.passTextView(textView);
Of course fragment must be added to backstack.
I'm doing a small app with FragmentTabHost and two nested fragments. I need update the data of nested fragments from the fragment that contains the FragmentTabHost but for any reason I don't have the second fragment (second tab) when I do click in its tab then I get a null pointer exception.
Here it is a test of my code:
TabsTransactionFragment.java, this is the Fragment that contain the FragmentTabHost
public class TabsTransactionFragment extends Fragment implements
OnTabChangeListener{
private static final String TAB_ONE_TAG = "ONE";
private static final String TAB_TWO_TAG = "TW0";
private FragmentTabHost mTabHost;
private ArrayList<Integer> mData;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mData = new ArrayList<Integer>();
for (int i=0; i<10; i++) {
mData.add(i);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_tabs_transations,
container, false);
mTabHost = (FragmentTabHost) view.findViewById(android.R.id.tabhost);
mTabHost.setup(getActivity(), getChildFragmentManager(),
android.R.id.tabcontent);
mTabHost.addTab(
mTabHost.newTabSpec(TAB_ONE_TAG).setIndicator(
"ODD"),
ListDataFragment.class, null);
mTabHost.addTab(
mTabHost.newTabSpec(TAB_TWO_TAG).setIndicator(
"EVEN"),
ListDataFragment.class, null);
mTabHost.setOnTabChangedListener(this);
return mTabHost;
}
#Override
public void onDestroyView() {
super.onDestroyView();
mTabHost = null;
}
private void updateDataChildFragments(String tabName) {
if (mData != null) {
ListDataFragment listOneFragment =
(ListDataFragment) getChildFragmentManager().findFragmentByTag(TAB_ONE_TAG);
ListDataFragment listTwoFragment =
(ListDataFragment) getChildFragmentManager().findFragmentByTag(TAB_TWO_TAG);
if (tabName.equalsIgnoreCase(TAB_ONE_TAG)) {
ArrayList<Integer> odds = new ArrayList<Integer>();
for (int i=0; i<mData.size(); i++) {
if (mData.get(i) % 2 != 0) {
odds.add(mData.get(i));
}
}
listOneFragment.updateData(odds);
} else {
ArrayList<Integer> even = new ArrayList<Integer>();
for (int i=0; i<mData.size(); i++) {
if (mData.get(i) % 2 != 0) {
even.add(mData.get(i));
}
}
// Fragment two is null then crash...
listTwoFragment.updateData(even);
}
}
}
#Override
public void onTabChanged(String tabName) {
updateDataChildFragments(tabName);
}
}
Each tab contains a simple ListFragment like this:
public class ListDataFragment extends ListFragment {
private ArrayAdapter<Integer> mAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mAdapter = new ArrayAdapter<Integer>(getActivity(), android.R.layout.simple_list_item_1);
setListAdapter(mAdapter);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent,
Bundle savedInstanceState) {
return super.onCreateView(inflater, parent, savedInstanceState);
}
public void updateData(ArrayList<Integer> data) {
mAdapter.addAll(data);
mAdapter.notifyDataSetChanged();
}
}
And layout fragment_tabs_transations.xml is the structure of android.support.v4.app.FragmentTabHost with a linearLayout, TabWidget and FrameLayout.
I have tried many things and ways but I haven't got to pass data to the second fragment once I do click... I have tried to created first both fragment and add to FragmentTabHost but I didn't get neither...
I think the problem it is the second fragment it is attached to FragmentTabHost after onTagChanged and that is because I can not find it... But I don't understand this behaviour... :S.
Anybody can help me? Or know any solution to pass data to second Fragment before do click in its tab?
Many thanks!!
I have the following FragmentActivity:
public class TabsActivity extends FragmentActivity {
private FragmentTabHost mTabHost;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tabs);
mTabHost = (FragmentTabHost)findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
mTabHost.addTab(mTabHost.newTabSpec("Home").setIndicator("Home", getResources().getDrawable(R.drawable.hometab)),HomeTab.class, null);
mTabHost.addTab(mTabHost.newTabSpec("Explore").setIndicator("Explore", getResources().getDrawable(R.drawable.exploretab)),ExploreTab.class, null);
mTabHost.addTab(mTabHost.newTabSpec("Info").setIndicator("Info", getResources().getDrawable(R.drawable.infotab)),InfoTab.class, null);
mTabHost.addTab(mTabHost.newTabSpec("Social").setIndicator("Social", getResources().getDrawable(R.drawable.socialtab)),SocialTab.class, null);
mTabHost.addTab(mTabHost.newTabSpec("Contact").setIndicator("Contact", getResources().getDrawable(R.drawable.contacttab)),ContactTab.class, null);
TabWidget tabWidget = mTabHost.getTabWidget();
tabWidget.setStripEnabled(false);
for(int i=0; i < tabWidget.getChildCount(); i++){
tabWidget.getChildAt(i).setBackgroundResource(R.drawable.tab_bg);
TextView tv = (TextView)tabWidget.getChildAt(i).findViewById(android.R.id.title);
tv.setTextColor(this.getResources().getColor(R.color.white));
}
mTabHost.setOnTabChangedListener(new OnTabChangeListener() {
#Override
public void onTabChanged(String tabId) {
Log.d("PAUL",tabId);
if(tabId=="Home"){
finish();
}
TabWidget tw = mTabHost.getTabWidget();
for(int i=0; i < tw.getChildCount(); i++){
TextView tabText = (TextView)tw.getChildAt(i).findViewById(android.R.id.title);
if(tabText.getText()==tabId){
tabText.setTextColor(TabsActivity.this.getResources().getColor(R.color.tcmgreen));
} else {
tabText.setTextColor(TabsActivity.this.getResources().getColor(R.color.white));
}
}
}
});
Intent intent = getIntent();
String tag = intent.getStringExtra("tab");
Log.d("DEBUG",tag);
mTabHost.setCurrentTabByTag(tag);
}
}
When the user taps the 'Explore' tab I get the following error: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. Here is my ExploreTab class:
public class ExploreTab extends Fragment {
private ArrayList<Level> levels;
private TCMSQLiteHelper sqliteHelper;
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
sqliteHelper = new TCMSQLiteHelper(this.getActivity());
levels = sqliteHelper.getAllLevels();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d("DEBUG","Explore Created");
View v = inflater.inflate(R.layout.explorelist, container);
return v;
}
}
This doesn't make any sense to me because I don't see where there could be a problem of a view already being loaded. What am I missing here?
In onCreateView(), you should be passing in a third parameter, false. This third parameter specifies whether the layout should attached itself to the ViewGroup container.
From the Fragments documentation:
In this case, this is false because the system is already inserting the inflated layout into the container—passing true would create a redundant view group in the final layout.
Thus your code should be:
View v = inflater.inflate(R.layout.explorelist, container, false);
I am trying to show a FragmentDialog ( created and shown as a dialog NOT added as content in a view hierarchy) where there is a ViewPager whose content is given by a FragmentPagerAdapter (provides Fragments consisting of an image).
The code works perfect when showing ViewPager + FragmentPagerAdapter from a FragmentActivity, but get the following exception when doing it from a FragmentDialog:
"IllegalArgumentException: No view found for id 0x7f040077 for fragment SimpleFragment..."
Here is my code:
A SherlockFragmentActivity with a button to create and show the dialog.
public class BorrameActivity extends SherlockFragmentActivity{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.one_act);
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View arg0) {
showTheDialog();
}});
}
private void showTheDialog(){
AchGalleryDialog newFragment = AchGalleryDialog.newInstance(achs);
newFragment.show(getSupportFragmentManager(), "dialog");
}
The FragmentDialog:
public class AchGalleryDialog extends DialogFragment{
public AchGalleryDialog(){
}
public static AchGalleryDialog newInstance(){
AchGalleryDialog f = new AchGalleryDialog();
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.dialog_user_result, container);
getDialog().setTitle("Hola tronco");
//content to show in the fragments
int[] images = new int[]{R.drawable.d1, R.drawable.d2, R.drawable.d3};
ViewPager pager = (ViewPager) view.findViewById(R.id.pager);
MyFragmentAdapter adapter = new MyFragmentAdapter(getFragmentManager(),images);
pager.setAdapter(adapter);
return view;
}
}
This is the very simple MyFragmentPagerAdapter,
I put only the getItem() method, and nullPointer checks:
#Override
public Fragment getItem(int position) {
return MySimpleFragment.newInstance(images[position]);
}
And finally SimpleFragment:
public class SimpleFragment extends Fragment{
int id;
public static SimpleAchFragment newInstance(int imgId){
SimpleFragment f = new SimpleFragment();
Bundle args = new Bundle();
args.putLong(ID_BUNDLE, imgId);
f.setArguments(args);
return f;
}
public SimpleAchFragment(){
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.id = getArguments() != null ? getArguments().getInt(ID_BUNDLE) : 0;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.simple_fragment, container, false);
FragmentActivity mAct = getActivity();
ImageView img = (ImageView) v.findViewById(R.id.image);
img.setImageDrawable(mAct.getResources().getDrawable(id));
return v;
}
}
More info, if the content passed to the adapter ( an int array with 3 ints) has length zero, then the adapter doesn't try to create any Fragment so dialogs appears correctly but empty (as expected).
The Exception is thrown at SimpleFragment.onCreateView() at the time of inflating.
The id referenced in the exception (as not found) correspond to ViewPager 's id, with is properly defined in R.layout.simple_fragment.
I have try also to build the Dialog with an AlertDialog.builder and also directly with Dialog() contructor, but get the same behaviour.
Try this:
In class AchGalleryDialog
MyFragmentAdapter adapter = new MyFragmentAdapter(getChildFragmentManager(),images);
instead of
MyFragmentAdapter adapter = new MyFragmentAdapter(getFragmentManager(),images);
Because of this:
http://developer.android.com/about/versions/android-4.2.html#NestedFragments
Hope this will help!