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why my recyclerview doesn't show data in fragment?

i have created the online wallpaper application and i used to activity for my app and i use volley and glide for my app but when i use bottom navigation drawer , activity is not useful .
after that i use fragment but now when i run application my recyclerview doesn't show anything
MainFragment.java:
package ir.zooding.wallpaper.activity;
import android.Manifest;
import android.app.ProgressDialog;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import ir.zooding.wallpaper.R;
import ir.zooding.wallpaper.adapter.GalleryAdapter;
import ir.zooding.wallpaper.app.AppController;
import ir.zooding.wallpaper.model.Image;
import ir.zooding.wallpaper.receiver.ConnectivityReceiver;
public class MainFragment extends Fragment implements ConnectivityReceiver.ConnectivityReceiverListener {
RecyclerView recycler_view;
static final String url="";
ArrayList<Image> images;
GalleryAdapter mAdapter;
ProgressDialog pd;
View v;
public static MainFragment newInstance() {
MainFragment fragment = new MainFragment();
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
v = inflater.inflate(R.layout.fragment_main, container, false);
Toolbar toolbar=(Toolbar)v.findViewById(R.id.toolbar);
((AppCompatActivity)getActivity()).setSupportActionBar(toolbar);
recycler_view=(RecyclerView) v.findViewById(R.id.recycler_view);
pd=new ProgressDialog(getActivity());
pd.setCancelable(false);
images=new ArrayList<>();
mAdapter=new GalleryAdapter(getActivity().getApplicationContext(),images);
RecyclerView.LayoutManager mLayoutManager=new GridLayoutManager(getActivity().getApplicationContext(),2);
recycler_view.setLayoutManager(mLayoutManager);
recycler_view.setAdapter(mAdapter);
Log.i("LOG:","stop 1");
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
1);
recycler_view.addOnItemTouchListener(new GalleryAdapter.RecyclerTouchListener(getActivity().getApplicationContext(),recycler_view, new GalleryAdapter.ClickListener() {
#Override
public void onClick(View view, int position) {
Bundle bundle=new Bundle();
bundle.putSerializable("images",images);
bundle.putInt("position",position);
//Log.i("LOG:",""+position);
// FragmentTransaction ft=getFragmentManager().beginTransaction();
android.app.FragmentTransaction ft=getActivity().getFragmentManager().beginTransaction();
SlideshowDialogFragment newFragment=SlideshowDialogFragment.newInstance();
newFragment.setArguments(bundle);
newFragment.show(ft,"slideshow");
}
#Override
public void onLongClick(View view, int position) {
}
}));
checkConnection();
fetchImages();
return inflater.inflate(R.layout.fragment_main, container, false);
}
#Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case 1: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// contacts-related task you need to do.
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(getActivity(), "دسترسی به حافظه داخلی لغو شد!!!", Toast.LENGTH_LONG).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
public void fetchImages()
{
pd.setMessage("در حال بارگزاری ...");
pd.show();
StringRequest req = new StringRequest(url,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
Log.d("", response.toString());
pd.dismiss();
images.clear();
try {
JSONObject object = new JSONObject(response);
JSONArray dataArray = object.getJSONArray("data");
for (int i = 0; i < dataArray.length(); i++) {
JSONObject dataObject = dataArray.getJSONObject(i);
Image image = new Image();
image.setName_client(dataObject.getString("name_client"));
image.setName(dataObject.getString("name"));
// JSONObject url = object.getJSONObject("url");
image.setSmall(dataObject.getString("small"));
image.setOriginal(dataObject.getString("orginal"));
image.setTimestamp(dataObject.getString("timestamp"));
images.add(image);
}
} catch (JSONException e) {
e.printStackTrace();
}
Log.i("LOG:","stop 2");
mAdapter.notifyDataSetChanged();
Log.i("LOG:","stop 3");
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("", "Error: " + error.getMessage());
pd.dismiss();
}
});
AppController.getmInstance().addToRequsetQueue(req);
}
// Method to manually check connection status
private void checkConnection() {
boolean isConnected = ConnectivityReceiver.isConnected();
showSnack(isConnected);
}
// Showing the status in Snackbar
private void showSnack(boolean isConnected) {
String message ="";
//View parentLayout = v.findViewById(android.R.id.content);
RelativeLayout parentLayout = (RelativeLayout)v.findViewById(R.id.mroot);
if (!isConnected) {
message = "اتصال شما به اینترنت برقرار نیست!";
Snackbar snackbar = Snackbar
.make(parentLayout, message, Snackbar.LENGTH_LONG)
.setAction("بررسی مجدد", new View.OnClickListener() {
#Override
public void onClick(View view) {
fetchImages();
checkConnection();
}
});
snackbar.setActionTextColor(Color.RED);
snackbar.setActionTextColor(Color.parseColor("#e62d3f"));
View sbView = snackbar.getView();
TextView textView = (TextView) sbView.findViewById(android.support.design.R.id.snackbar_text);
textView.setTextColor(Color.parseColor("#FFC107"));
snackbar.setDuration(8000);
snackbar.show();
}
}
#Override
public void onResume() {
super.onResume();
// register connection status listener
AppController.getmInstance().setConnectivityListener(this);
}
/**
* Callback will be triggered when there is change in
* network connection
*/
#Override
public void onNetworkConnectionChanged(boolean isConnected) {
showSnack(isConnected);
}
}
GalleryAdapter.java:
package ir.zooding.wallpaper.adapter;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import java.util.List;
import ir.zooding.wallpaper.R;
import ir.zooding.wallpaper.model.Image;
import static android.R.animator.fade_in;
public class GalleryAdapter extends RecyclerView.Adapter<GalleryAdapter.MyViewHolder> {
List<Image> images;
Context mContext;
public GalleryAdapter (Context context,List<Image> images){
this.images = images;
mContext = context;
}
#Override
public GalleryAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.gallery_thumbnail,parent,false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(GalleryAdapter.MyViewHolder holder, int position) {
Image image = images.get(position);
Glide.with(mContext).load(image.getSmall())
.thumbnail(0.5f)
.diskCacheStrategy(DiskCacheStrategy.ALL)
.placeholder(R.drawable.loading)
.fitCenter()
.into(holder.thumbnail);
}
#Override
public int getItemCount() {
return images.size();
}
public interface ClickListener{
void onClick (View view,int position);
void onLongClick (View view,int position);
}
public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener{
GalleryAdapter.ClickListener clickListener;
GestureDetector gestureDetector;
public RecyclerTouchListener(Context context,final RecyclerView recyclerView,final GalleryAdapter.ClickListener clickListener){
this.clickListener = clickListener;
gestureDetector = new GestureDetector(context,new GestureDetector.SimpleOnGestureListener(){
#Override
public boolean onSingleTapUp(MotionEvent e){
return true;
}
#Override
public void onLongPress(MotionEvent e){
View child = recyclerView.findChildViewUnder(e.getX(),e.getY());
if(child != null && clickListener != null){
clickListener.onLongClick(child,recyclerView.getChildPosition(child));
}
}
});
}
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(),e.getY());
if(child != null && clickListener != null&& gestureDetector.onTouchEvent(e)){
clickListener.onClick(child,rv.getChildPosition(child));
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
public class MyViewHolder extends RecyclerView.ViewHolder{
ImageView thumbnail;
public MyViewHolder(View view) {
super(view);
thumbnail =(ImageView) view.findViewById(R.id.thumbnail);
}
}
}
MainActivity.java:
package ir.zooding.wallpaper.activity;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import ir.adad.client.Adad;
import ir.zooding.wallpaper.R;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Adad.initialize(getApplicationContext());
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
BottomNavigationView bottomNavigationView = (BottomNavigationView)
findViewById(R.id.navigation);
bottomNavigationView.setOnNavigationItemSelectedListener
(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()) {
case R.id.action_item1:
selectedFragment = MainFragment.newInstance();
break;
case R.id.action_item2:
selectedFragment = CategoryFragment.newInstance();
break;
case R.id.action_item3:
selectedFragment = InfoFragment.newInstance();
break;
}
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_layout, selectedFragment);
transaction.commit();
return true;
}
});
//Manually displaying the first fragment - one time only
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_layout, MainFragment.newInstance());
transaction.commit();
//Used to select an item programmatically
//bottomNavigationView.getMenu().getItem(2).setChecked(true);
}
}
fragment_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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"
android:fitsSystemWindows="true">
<RelativeLayout
android:id="#+id/mroot"
android:layout_width="match_parent"
android:layout_height="match_parent">
</RelativeLayout>
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
/>
</android.support.design.widget.AppBarLayout>
<include
android:id="#+id/include"
layout="#layout/content_main"/>
content_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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:orientation="vertical"
android:paddingTop="?attr/actionBarSize">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:scrollbars="vertical"/>

There are Contexts considerations you need to make throught your code. You may be using the wrong Contexts example very big Contexts. For example from what I can see fast one of it is this line in MainFragment.java:
mAdapter=new GalleryAdapter(getActivity().getApplicationContext(),images);
You have passed the application context while you need just Context from Activity. So change that to:
mAdapter=new GalleryAdapter(getActivity(),images); // remove the method getApplicationContext
Try doing that if it will work or else lets try finding more code that may bring a problem.

Webview does not reload

I am using fragments and have added a item on the action bar to refresh webview named airport_menuRefresh but when ever i click it nothing happens. I have 3 tabs. I have tried different methods but neither of them works.
Here is the code of my 1tab(tab1 only contains the not working logic to refresh).
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
public class GamesFragment extends Fragment {
private ProgressBar progress;
private WebView myWebView;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
String url = "http://google.com";
int delay = 6 * 1000;
View rootView = inflater.inflate(R.layout.fragment_games, container, false);
myWebView = (WebView)rootView.findViewById(R.id.webViewGames);
myWebView.setWebChromeClient(new myWebViewClient());
myWebView.getSettings().setJavaScriptEnabled(true);
progress = (ProgressBar)rootView.findViewById(R.id.progressBar);
progress.setMax(100);
Handler handler = new Handler();
MyRunnable runnable = new MyRunnable(url, myWebView);
handler.postDelayed(runnable, delay);
myWebView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView View, String url) {
GamesFragment.this.progress.setProgress(0);
View.loadUrl(url);
return true;
}
});
myWebView.setOnKeyListener(new android.view.View.OnKeyListener() {
#Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
WebView webView = (WebView) v;
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (webView.canGoBack()) {
webView.goBack();
return true;
}
break;
}
}
return false;
}
});
return rootView;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.airport_menuRefresh:
GamesFragment.this.myWebView.loadUrl("http://google.com");
return true;
}
return super.onOptionsItemSelected(item);
}
public class MyRunnable implements Runnable {
String url;
private WebView mywebview;
public MyRunnable(String url, WebView wv) {
this.url = url;
this.mywebview = wv;
}
public void run() {
mywebview.loadUrl(url);
}
}
private class myWebViewClient extends WebChromeClient {
#Override
public void onProgressChanged(WebView view, int newProgress) {
GamesFragment.this.setValue(newProgress);
super.onProgressChanged(view, newProgress);
}
}
public void setValue(int progress) {
this.progress.setProgress(progress);
}
}
Here is my main Activity:
import android.annotation.TargetApi;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import com.tech.example.adaptor.SlidingTabLayout;
import com.tech.example.adaptor.TabsPagerAdapter;
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class MainActivity extends ActionBarActivity {
SlidingTabLayout tabs;
ViewPager viewPager;
TabsPagerAdapter adapter;
Toolbar toolbar;
private Menu optionsMenu;
CharSequence Titles[]={ "tab1", "tab2", "tab3" };
int Numboftabs =3;
#TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
adapter = new TabsPagerAdapter(getSupportFragmentManager(), Titles, Numboftabs);
// Assigning ViewPager View and setting the adapter
viewPager = (ViewPager) findViewById(R.id.pager);
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(2);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true);
setRefreshActionButtonState(true);
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.tabsScrollColor);
}
#Override
public int getDividerColor(int i) {
return 0;
}
});
tabs.setViewPager(viewPager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
this.optionsMenu = menu;
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_main, menu);
return true;
}
public void setRefreshActionButtonState(final boolean refreshing) {
if (optionsMenu != null) {
final MenuItem refreshItem = optionsMenu
.findItem(R.id.airport_menuRefresh);
if (refreshItem != null) {
if (refreshing) {
refreshItem.setActionView(R.layout.actionbar_indeterminate_progress);
} else {
refreshItem.setActionView(null);
}
}
}
}
}
EDIT
I edited my main activity like this:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.airport_menuRefresh:
GamesFragment.myWebView1.loadUrl("http://example.com");
MoviesFragment.myWebView.loadUrl("http://example2.com");
TopRatedFragment.myWebView2.loadUrl("http://example3.com");
return true;
}
return super.onOptionsItemSelected(item);
}
Now its reloading but suppose i click reload on tab1 all 3 tabs reloads! Any solution?

I guess error is in the name of the WebView of your methods. As long as you imported:
import android.view.View;
When in this methow
public boolean shouldOverrideUrlLoading(WebView View, String url) {
// ^-----> UPPERCASE
you make this call:
View.loadUrl(url);
you're trying to call static method of View and not the instance of View from method signature.
try this:
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// ^---> lowercase
GamesFragment.this.progress.setProgress(0);
view.loadUrl(url);
// ^---> lowercase
return true;
}

Finally i found a solution.
Moved onCreateOptionsMenu and onOptionsItemSelected from main activity to fragment tabs like this
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
.............
.............
.............
setHasOptionsMenu(true);
.................
.................
}
#Override
public void onCreateOptionsMenu(
Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// handle item selection
switch (item.getItemId()) {
case R.id.airport_menuRefresh:
TopRatedFragment.this.myWebView2.loadUrl("http://myexample.com");
return true;
default:
return super.onOptionsItemSelected(item);
}
}
And this worked like a charm.

Android Action bar buttons wont show up with navigation drawer with fragmentactivity

i am trying to show some buttons in actionbar but they just dont show up
i have successfully implemented the navigation drawer and viewpager using fragments
the implementes for showing menu inflator and action bar buttons has also been done but they just wont show up
in menu/main.xml i have added app:showAsAction="always" but still it wont show up
here is the
detailactivity.java
package com.test.app;
import java.lang.reflect.Field;
import android.app.ActionBar;
import android.content.Intent;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.ActionBarDrawerToggle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
//import android.support.v7.app.ActionBar;
import com.Blog.gkgyan.parser.RSSFeed;
//public class DetailActivity extends FragmentActivity implements OnItemClickListener{
public class DetailActivity extends FragmentActivity implements OnItemClickListener{
RSSFeed feed;
int pos;
private DescAdapter adapter;
private ViewPager pager;
private DrawerLayout drawerLayout;
private ListView listView;
private String[] planets;
private ActionBarDrawerToggle drawerListener;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detail);
//Drawer Layout
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerListener = new ActionBarDrawerToggle(this, drawerLayout,R.drawable.ic_drawer,R.string.drawer_open, R.string.drawer_close){
#Override
public void onDrawerClosed(View drawerView) {
// TODO Auto-generated method stub
//super.onDrawerClosed(drawerView);
Toast.makeText(DetailActivity.this, "Drawer closed", Toast.LENGTH_LONG).show();
}
#Override
public void onDrawerOpened(View drawerView) {
// TODO Auto-generated method stub
//super.onDrawerOpened(drawerView);
Toast.makeText(DetailActivity.this, "Drawer opened", Toast.LENGTH_LONG).show();
}
};
drawerLayout.setDrawerListener(drawerListener);
//getSupportActionBar().setHomeButtonEnabled(true);
//getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);;
getActionBar().setDisplayHomeAsUpEnabled(true);
// try {
// ViewConfiguration config = ViewConfiguration.get(this);
// Field menuKeyField = ViewConfiguration.class.getDeclaredField("sHasPermanentMenuKey");
// if (menuKeyField != null) {
// menuKeyField.setAccessible(true);
// menuKeyField.setBoolean(config, false);
// }
// } catch (Exception e) {
// e.printStackTrace();
// }
if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
try {
ViewConfiguration config = ViewConfiguration.get(this);
Field menuKeyField = ViewConfiguration.class.getDeclaredField("sHasPermanentMenuKey");
if(menuKeyField != null) {
menuKeyField.setAccessible(true);
menuKeyField.setBoolean(config, false);
}
} catch (Exception e) { e.printStackTrace(); }
}
listView = (ListView) findViewById(R.id.drawerlist);
planets = getResources().getStringArray(R.array.planets);
listView.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, planets ));
listView.setOnItemClickListener(this);
// Get the feed object and the position from the Intent
feed = (RSSFeed) getIntent().getExtras().get("feed");
pos = getIntent().getExtras().getInt("pos");
// Initialize the views
adapter = new DescAdapter(getSupportFragmentManager());
pager = (ViewPager) findViewById(R.id.pager);
// Set Adapter to pager:
pager.setAdapter(adapter);
pager.setCurrentItem(pos);
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
// TODO Auto-generated method stub
super.onConfigurationChanged(newConfig);
drawerListener.onConfigurationChanged(newConfig);
}
#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;
//return super.onCreateOptionsMenu(menu);
}
//#Override
//public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
if (drawerListener.onOptionsItemSelected(item)) {
return true;
}
Intent i = null;
switch (item.getItemId()) {
case R.id.action_rate:
String webpage = "http://developer.android.com/index.html";
i = new Intent(Intent.ACTION_VIEW, Uri.parse(webpage));
startActivity(i);
//return true;
break;
case R.id.action_share:
i = new Intent();
i.setAction(Intent.ACTION_SEND);
i.putExtra(Intent.EXTRA_TEXT, "Hello from Hansel and Petal!");
i.setType("text/plain");
startActivity(i);
//return true;
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onPostCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onPostCreate(savedInstanceState);
drawerListener.syncState();
}
public class DescAdapter extends FragmentStatePagerAdapter {
public DescAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return feed.getItemCount();
}
#Override
public Fragment getItem(int position) {
DetailFragment frag = new DetailFragment();
Bundle bundle = new Bundle();
bundle.putSerializable("feed", feed);
bundle.putInt("pos", position);
frag.setArguments(bundle);
return frag;
}
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
if (position == 0) {
Intent intent = new Intent(this, GkcategoryListActivity.class);
startActivity(intent);
}
else if (position == 1) {
Intent intent = new Intent(this, GkcategoryListActivity.class);
startActivity(intent);
}
overridePendingTransition(R.anim.slide_in, R.anim.slide_out);
}
}
`
and menu/main.xml
<menu 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"
tools:context="com.Blog.gkgyan.MainActivity" >
<item
android:id="#+id/action_settings"
android:orderInCategory="100"
android:title="#string/action_settings"
app:showAsAction="never"/>
<item
android:id="#+id/action_share"
android:icon="#drawable/ic_action_share"
android:orderInCategory="101"
android:title="#string/action_share"
app:showAsAction="always" />
<item
android:id="#+id/action_rate"
android:icon="#drawable/ic_action_important"
android:orderInCategory="101"
android:title="#string/action_rate"
app:showAsAction="always"/>
</menu>
i wan to show the action_share and Action_rate butons in action bar on detailactivity.java tried every thing nothing works on this page
however it does work perfectly fine in main activity.java
here is the code
import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#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;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
Intent intent = null;
switch (item.getItemId()) {
case R.id.action_rate:
String webpage = "http://developer.android.com/index.html";
intent = new Intent(Intent.ACTION_VIEW, Uri.parse(webpage));
startActivity(intent);
break;
case R.id.action_share:
intent = new Intent();
intent.setAction(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_TEXT, "Hello from Hansel and Petal!");
intent.setType("text/plain");
startActivity(intent);
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
public void latestActivity(View v){
//Intent intent = new Intent(this, SplashActivity.class);
Intent intent = new Intent(this, GkcategoryListActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.slide_in, R.anim.slide_out);
}
}
is it a issue with fragment activity or navigation drawer any help would be great please mention where is should make changes in my code

Unable to launch app - java.lang.NullPointerException [duplicate]

This question already has answers here:
NullPointerException accessing views in onCreate()
(13 answers)
Closed 8 years ago.
I'm having problems launching my app (crashes), while there is no errors in code.
This happend after i converted code of List View activity to List Fragment...
My main activity:
package com.example.eronetmarket;
import com.preporuceno_app.AppAdapter;
import android.R.drawable;
import android.app.ActionBar;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
public class MainActivity extends FragmentActivity implements ActionBar.TabListener {
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.itemmenu, menu);
return true;
}
ViewPager viewPager=null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.pager);
final ActionBar actionBar=getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setBackgroundDrawable(new ColorDrawable(Color.RED));
//actionBar.setDisplayShowHomeEnabled(false);
addTabs(actionBar);
viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int i, float v, int i2) {
Log.d("VIVZ","onPageScrolled "+i+" "+v+" "+i2);
}
#Override
public void onPageSelected(int i) {
actionBar.setSelectedNavigationItem(i);
Log.d("VIVZ","onPageSelected "+i);
}
#Override
public void onPageScrollStateChanged(int i) {
if(i==ViewPager.SCROLL_STATE_IDLE)
Log.d("VIVZ","onPageScrollStateChanged scroll state idle "+i);
if(i==ViewPager.SCROLL_STATE_DRAGGING)
Log.d("VIVZ","onPageScrollStateChanged scroll state dragging "+i);
if(i==ViewPager.SCROLL_STATE_SETTLING)
Log.d("VIVZ","onPageScrollStateChanged scroll state settling "+i);
}
});
}
private void addTabs(ActionBar actionBar)
{
ActionBar.Tab tab1=actionBar.newTab();
tab1.setText("PREPORUČENO");
tab1.setTabListener(this);
ActionBar.Tab tab2=actionBar.newTab();
tab2.setText("NAJPOPULARNIJE");
tab2.setTabListener(this);
ActionBar.Tab tab3=actionBar.newTab();
tab3.setText("KATEGORIJE");
tab3.setTabListener(this);
actionBar.addTab(tab1);
actionBar.addTab(tab2);
actionBar.addTab(tab3);
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
viewPager.setCurrentItem(tab.getPosition());
// Log.d("VIVZ","onTabSelected "+tab.getText());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
// Log.d("VIVZ","onTabUnselected "+tab.getText());
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
// Log.d("VIVZ","onTabReselected "+tab.getText());
}
}
class MyAdapter extends FragmentStatePagerAdapter
{
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
Fragment fragment=null;
if(i==0)
{
fragment=new FragmentA();
}
if(i==1)
{
fragment=new Preporuceno();
}
if(i==2)
{
fragment=new FragmentC();
}
return fragment;
}
#Override
public int getCount() {
return 3;
}
}
And my fragment list:
package com.example.eronetmarket;
import java.io.FileNotFoundException;
import android.content.Context;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.ListFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
public class Preporuceno extends ListFragment {
private AppAdapter mAdapter;
private ListView siteList;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Log.i("mobAppModel", "OnCreate()");
View rootView = inflater.inflate(R.layout.activity_preporuceno, container, false);
siteList = (ListView) getActivity().findViewById(R.id.listView1);
siteList.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View v, int pos,long id) {
String url = mAdapter.getItem(pos).getstoreURL();
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
}
});
if(isNetworkAvailable()){
Log.i("mobAppModel", "starting download Task");
AppDownloadTask download = new AppDownloadTask();
download.execute();
}else{
mAdapter = new AppAdapter(getActivity().getApplicationContext(), -1, XMLsourcePullParser.getmobAppModel(getActivity()));
siteList.setAdapter(mAdapter);
}
return rootView;
}
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager
= (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null && activeNetworkInfo.isConnected();
}
private class AppDownloadTask extends AsyncTask<Void, Void, Void>{
#Override
protected Void doInBackground(Void... arg0) {
//Download the file
try {
Downloader.DownloadFromUrl("http://minores.info/joomla30/stacksites.xml", getActivity().openFileOutput("XMLsource.xml", Context.MODE_PRIVATE));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result){
//setup our Adapter and set it to the ListView.
mAdapter = new AppAdapter(getActivity().getApplicationContext(), -1, XMLsourcePullParser.getmobAppModel(getActivity()));
siteList.setAdapter(mAdapter);
Log.i("mobAppModel", "adapter size = "+ mAdapter.getCount());
}
}
}
Here is my LogCat messages:
In line 38 where LogCat shows error, I have this line public void onItemClick(AdapterView<?> parent, View v, int pos,long id) {
I don't understand where I went wrong?

Change this
siteList = (ListView) getActivity().findViewById(R.id.listView1);
to
siteList = (ListView) rootView.findViewById(R.id.listView1);
The view belongs to the inflated layout and you need to use the view object to initialize views.
java.lang.RuntimeException: Your content must have a ListView whose
id attribute is 'android.R.id.list'
ListActivity or ListFragment will have listview which occuppies the entire screen. If you want to have other views in the layout then your layout must have listview with id andorid.R.id.list
http://developer.android.com/reference/android/app/ListFragment.html
QUoting docs
ListFragment has a default layout that consists of a single list view.
However, if you desire, you can customize the fragment layout by
returning your own view hierarchy from onCreateView(LayoutInflater,
ViewGroup, Bundle). To do this, your view hierarchy must contain a
ListView object with the id "#android:id/list" (or list if it's in
code)

How do I change the font for tab titles created from PagerSlidingTabStrip?

Here is the library in question: https://github.com/astuetz/PagerSlidingTabStrip
I figure it has something to do with .setTypeface() but I have no idea how to use it. I put the font I want in the assets folder. Here's my code.
Start.java
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.text.Editable;
import android.util.TypedValue;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.astuetz.PagerSlidingTabStrip;
public class Start extends FragmentActivity {
private final Handler handler = new Handler();
private PagerSlidingTabStrip tabs;
private ViewPager pager;
private MyPagerAdapter adapter;
private int currentColor = 0xFF547CC1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
pager = (ViewPager) findViewById(R.id.pager);
adapter = new MyPagerAdapter(getSupportFragmentManager());
pager.setAdapter(adapter);
final int pageMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 4, getResources()
.getDisplayMetrics());
pager.setPageMargin(pageMargin);
tabs.setViewPager(pager);
tabs.setIndicatorColor(currentColor);
/*Typeface tf = Typeface.createFromAsset(getAssets(), "RobotoCondensed-Regular.ttf");
tabs.setTypeface(tf,Typeface.NORMAL);*/
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.start, 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();
if (id == R.id.action_settings) {
return true;
}else if(id == R.id.add_location){
Toast.makeText(getApplicationContext(), "todo", Toast.LENGTH_SHORT).show();
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Enter a location");
alert.setMessage("Enter a zipcode or city");
final EditText input = new EditText(this);
alert.setView(input);
alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Editable value = input.getText();
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
//Canceled.
}
});
alert.show();
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onSaveInstanceState(Bundle outState){
super.onSaveInstanceState(outState);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState){
super.onRestoreInstanceState(savedInstanceState);
}
private Drawable.Callback drawableCallback = new Drawable.Callback() {
#Override
public void invalidateDrawable(Drawable who) {
getActionBar().setBackgroundDrawable(who);
}
#Override
public void scheduleDrawable(Drawable who, Runnable what, long when) {
handler.postAtTime(what, when);
}
#Override
public void unscheduleDrawable(Drawable who, Runnable what) {
handler.removeCallbacks(what);
}
};
public class MyPagerAdapter extends FragmentPagerAdapter{
private final String[] TABS = {"Today", "This Week"};
public MyPagerAdapter(FragmentManager fm){
super(fm);
}
public CharSequence getPageTitle(int position){
return TABS[position];
}
#Override
public int getCount() {
return TABS.length;
}
#Override
public Fragment getItem(int position) {
return WeatherTabs.newInstance(position);
}
}
}
activity_start.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.astuetz.PagerSlidingTabStrip
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="48dip"
app:pstsShouldExpand="true" />
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tabs"
tools:context=".Start" />
</RelativeLayout>
As you can see in Start.java, I have already tried to use .setTypeface() in the onCreate() method and it produces no errors, but when I run my app it crashes on startup so I'm not using .setTypeface() correctly.

add below code in your activity it works:
com.viewpagerindicator.TabPageIndicator indicator = (com.viewpagerindicator.TabPageIndicator) findViewById(R.id.tabs);
Typeface type = Typeface.createFromAsset(getAssets(),"fonts/BYekan+ Bold.ttf");
LinearLayout view = (LinearLayout) indicator.getChildAt(0);
int tabCount=3;
for(int i=0;i<tabCount;i++){
TextView textView = (TextView) view.getChildAt(i);
textView.setTypeface(type);
}

if you use this library :
https://github.com/jpardogo/PagerSlidingTabStrip
in PagerSlidingTabStrip class change line 185 :
mTabTextTypeface = Typeface.create(tabTextTypefaceName, mTabTextTypefaceStyle);
to this :
mTabTextTypeface = Typeface.create(Typeface.createFromAsset(context.getAssets(),"DroidNaskh.ttf"), mTabTextTypefaceStyle);

I ran into this a while back - without overriding ViewPager code there isn't a way to do this

I used PagerSlidingTabStrip lib and i set like this and it is worked for me
public void changeTabsFont( PagerSlidingTabStrip tabs)
{
try
{
Typeface tab_face;
tab_face = Typeface.create(Typeface.createFromAsset(activity.getAssets(), "font/NanumBarunGothic.ttf"), Typeface.NORMAL);
ViewGroup vg = (ViewGroup) tabs.getChildAt(0);
int tabsCount = vg.getChildCount();
for (int j = 0; j < tabsCount; j++)
{
ViewGroup vgTab = (ViewGroup) vg.getChildAt(j);
int tabChildsCount = vgTab.getChildCount();
for (int i = 0; i < tabChildsCount; i++)
{
View tabViewChild = vgTab.getChildAt(i);
if (tabViewChild instanceof TextView)
{
((TextView) tabViewChild).setTypeface(tab_face, Typeface.NORMAL);
}
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
}