Android.view.InflateException: Línea de archivo XML binario # 28: Error al inflar fragmento de clase

Estoy tratando de desarrollar una aplicación que tiene un cajón de navegación y un fragmento para mostrar datos. Esta es la pila de actividades de mi aplicación:

-> Iniciar sesión (comprueba si está conectado, omite la carga de la vista y continúa con la línea de tiempo)

-> Cronograma

Ésta es la manera que consigo el error:

-> Inicie la aplicación

-> Pasa por alto la pantalla de inicio de sesión porque ya estoy conectado

-> Todo se ve bien, luego hago clic en Cerrar sesión desde el cajón de menús o presionar el botón Atrás

-> vuelvo a la pantalla de inicio de sesión

-> Ahora si presiono Iniciar sesión nuevamente y vuelvo a iniciar la actividad Línea de tiempo, mi aplicación se bloquea …

Aquí están los códigos. Este es el logcat:

11-15 21:11:52.050 18695-18695/lazarko.pocketformulas E/AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{lazarko.pocketformulas/lazarko.pocketformulas.Timeline}: android.view.InflateException: Binary XML file line #28: Error inflating class fragment at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2355) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391) at android.app.ActivityThread.access$600(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1335) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:155) at android.app.ActivityThread.main(ActivityThread.java:5520) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796) at dalvik.system.NativeStart.main(Native Method) Caused by: android.view.InflateException: Binary XML file line #28: Error inflating class fragment at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) at android.view.LayoutInflater.rInflate(LayoutInflater.java:746) at android.view.LayoutInflater.inflate(LayoutInflater.java:489) at android.view.LayoutInflater.inflate(LayoutInflater.java:396) at android.view.LayoutInflater.inflate(LayoutInflater.java:352) at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:324) at android.app.Activity.setContentView(Activity.java:1912) at lazarko.pocketformulas.Timeline.onCreate(Timeline.java:35) at android.app.Activity.performCreate(Activity.java:5066) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1101) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)             at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)             at android.app.ActivityThread.access$600(ActivityThread.java:151)             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1335)             at android.os.Handler.dispatchMessage(Handler.java:99)             at android.os.Looper.loop(Looper.java:155)             at android.app.ActivityThread.main(ActivityThread.java:5520)             at java.lang.reflect.Method.invokeNative(Native Method)             at java.lang.reflect.Method.invoke(Method.java:511)             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)             at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at android.support.v4.widget.DrawerLayout.isDrawerView(DrawerLayout.java:1097) at android.support.v4.widget.DrawerLayout.closeDrawer(DrawerLayout.java:1306) at lazarko.pocketformulas.NavigationDrawerFragment.selectItem(NavigationDrawerFragment.java:209) at lazarko.pocketformulas.NavigationDrawerFragment.onCreate(NavigationDrawerFragment.java:82) at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:798) at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1015) at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1114) at android.app.Activity.onCreateView(Activity.java:4722) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)             at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)             at android.view.LayoutInflater.inflate(LayoutInflater.java:489)             at android.view.LayoutInflater.inflate(LayoutInflater.java:396)             at android.view.LayoutInflater.inflate(LayoutInflater.java:352)             at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:324)             at android.app.Activity.setContentView(Activity.java:1912)             at lazarko.pocketformulas.Timeline.onCreate(Timeline.java:35)             at android.app.Activity.performCreate(Activity.java:5066)             at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1101)             at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)             at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)             at android.app.ActivityThread.access$600(ActivityThread.java:151)             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1335)             at android.os.Handler.dispatchMessage(Handler.java:99)             at android.os.Looper.loop(Looper.java:155)             at android.app.ActivityThread.main(ActivityThread.java:5520)             at java.lang.reflect.Method.invokeNative(Native Method)             at java.lang.reflect.Method.invoke(Method.java:511)             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)             at dalvik.system.NativeStart.main(Native Method)

Este es mi código de actividad:

 public class Timeline extends FragmentActivity implements NavigationDrawerFragment.NavigationDrawerCallbacks, SearchView.OnQueryTextListener { private static NavigationDrawerFragment mNavigationDrawerFragment; private CharSequence mTitle; public static Context context; SearchView searchView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_timeline); context = getApplicationContext(); mNavigationDrawerFragment = (NavigationDrawerFragment) getFragmentManager().findFragmentById(R.id.navigation_drawer); mTitle = getTitle(); // Set up the drawer. mNavigationDrawerFragment.setUp( R.id.navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout)); } public static Context getContext() { return context; } @Override protected void onStart() { super.onStart(); } @Override protected void onResume() { super.onStart(); FragmentManager fragmentManager = getSupportFragmentManager(); SharedPreferences preferencesFragmentData = getSharedPreferences("fragmentData", 0); String fragmentID = preferencesFragmentData.getString("currentFragment", ""); if(fragmentID == "FAVORITES_FRAGMENT") fragmentManager.beginTransaction().replace(R.id.container, new Favorites()).commit(); else if (fragmentID == "TIMELINE_FRAGMENT") fragmentManager.beginTransaction().replace(R.id.container, new PlaceholderFragment()).commit(); else if (fragmentID == "SETTINGS_FRAGMENT") fragmentManager.beginTransaction().replace(R.id.container, new Settings()).commit(); } @Override protected void onPause() { super.onPause(); } @Override public void onNavigationDrawerItemSelected(int position) { FragmentManager fragmentManager = getSupportFragmentManager(); SharedPreferences preferencesFragmentData = getSharedPreferences("fragmentData", 0); SharedPreferences.Editor editorFragmentData = preferencesFragmentData.edit(); switch(position) { case 1: //Timeline clicked editorFragmentData.putString("currentFragment", "TIMELINE_FRAGMENT"); editorFragmentData.commit(); fragmentManager.beginTransaction() .replace(R.id.container, new PlaceholderFragment(), "TIMELINE_FRAGMENT") .commit(); break; case 2: //Favorites clicked editorFragmentData.putString("currentFragment", "FAVORITES_FRAGMENT"); editorFragmentData.commit(); fragmentManager.beginTransaction() .replace(R.id.container, new Favorites(), "FAVORITES_FRAGMENT") .commit(); break; case 3: //Settings clicked editorFragmentData.putString("currentFragment", "SETTINGS_FRAGMENT"); editorFragmentData.commit(); fragmentManager.beginTransaction() .replace(R.id.container, new Settings()) .commit(); break; case 4: //Log Out clicked SharedPreferences loginDataPreferences = getSharedPreferences("loginData", 0); SharedPreferences.Editor editorLogin = loginDataPreferences.edit(); editorLogin.putBoolean("loggedIn", false); editorLogin.commit(); Intent intent = new Intent(getApplicationContext(), Login.class); startActivity(intent); break; default: editorFragmentData.putString("currentFragment", "TIMELINE_FRAGMENT"); editorFragmentData.commit(); fragmentManager.beginTransaction() .replace(R.id.container, new PlaceholderFragment()) .commit(); break; } } public void restoreActionBar() { ActionBar actionBar = getActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); actionBar.setDisplayShowTitleEnabled(true); } @Override public boolean onCreateOptionsMenu(Menu menu) { if(!mNavigationDrawerFragment.isDrawerOpen()) { menu.clear(); getMenuInflater().inflate(R.menu.timeline, menu); //restoreActionBar(); searchView = new SearchView(getActionBar().getThemedContext()); searchView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); searchView.setQueryHint(Html.fromHtml("<font color=#FFFFFF>Search ... </font>")); searchView.setOnQueryTextListener(this); searchView.clearFocus(); menu.add("Search").setIcon(R.drawable.ic_action_action_search).setActionView(searchView).setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW); } 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(); return false; } //User searched for a formula and pressed Enter @Override public boolean onQueryTextSubmit(String s) { SharedPreferences preferencesFragmentData = getSharedPreferences("fragmentData", 0); String currentFragment = preferencesFragmentData.getString("currentFragment", ""); if(currentFragment == "TIMELINE_FRAGMENT"){ //Log.e("TIMELINE", currentFragment + "IN THE IF FRAGMENT"); //Toast.makeText(getContext(), "You searched for: " + s + " in Timeline Fragment!", Toast.LENGTH_SHORT).show(); } else if (currentFragment == "FAVORITES_FRAGMENT"){ //Log.e("TIMELINE", currentFragment + "IN THE IF FRAGMENT"); //Toast.makeText(getContext(), "You searched for: " + s + " in FAVORITES Fragment!", Toast.LENGTH_SHORT).show(); } //Hide the keyboard InputMethodManager inputManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE); inputManager.hideSoftInputFromWindow(this.getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); invalidateOptionsMenu(); return true; } //user started typing, this code block is for Autocomplete or Suggestions based on his current input @Override public boolean onQueryTextChange(String s) { return false; } }

Este es el primer fragmento que se muestra:

 /** * Created by lazarnikolov on 11/8/14. */ public class PlaceholderFragment extends Fragment { /** * The fragment argument representing the section number for this * fragment. */ private static final String ARG_SECTION_NUMBER = "section_number"; private static View rootView; FavoritesDatabaseAdapter favoritesDB; SwipeRefreshLayout swipeRefreshLayout = null; /** * Returns a new instance of this fragment for the given section * number. */ public PlaceholderFragment() { } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState) { if (rootView != null) { ViewGroup parent = (ViewGroup) rootView.getParent(); if (parent != null) parent.removeView(rootView); } try { rootView = inflater.inflate(R.layout.fragment_timeline, container, false); } catch (InflateException e) { } favoritesDB = new FavoritesDatabaseAdapter(getActivity().getApplicationContext()); final ContentValues contentValues = new ContentValues(); final LinearLayout llScrollViewContainerItems = (LinearLayout) container.findViewById(R.id.llScrollViewContainerItems); llScrollViewContainerItems.removeAllViews(); ActionBar actionBar = getActivity().getActionBar(); final Typeface font = Typeface.createFromAsset(getActivity().getAssets(), "ubuntu.ttf"); actionBar.setBackgroundDrawable(new ColorDrawable(getResources().getColor(R.color.PeterRiver))); actionBar.setDisplayShowTitleEnabled(true); actionBar.setTitle("Timeline"); swipeRefreshLayout = (SwipeRefreshLayout) container.findViewById(R.id.container); swipeRefreshLayout.setColorSchemeResources(R.color.Alizarin, R.color.Emerald, R.color.PeterRiver, R.color.Amethyst, R.color.WetAsphalt); swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {...} return rootView; } @Override public void onAttach(Activity activity) { super.onAttach(activity); } @Override public void onStop() { super.onStop(); } @Override public void onDestroyView() { super.onDestroyView(); Fragment f = (Fragment) getFragmentManager() .findFragmentByTag("TIMELINE_FRAGMENT"); if (f != null) getFragmentManager().beginTransaction().remove(f).commit(); } }

Aquí está mi archivo activity_timeline.xml, donde ocurre el error:

 <!-- A DrawerLayout is intended to be used as the top-level content view using match_parent for both width and height to consume the full space available. --> <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".Timeline"> <!-- As the main content view, the view below consumes the entire space available using match_parent in both dimensions. --> <android.support.v4.widget.SwipeRefreshLayout android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/svContainerViews"> <LinearLayout android:id="@+id/llScrollViewContainerItems" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> </LinearLayout> </ScrollView> </android.support.v4.widget.SwipeRefreshLayout> <!-- android:layout_gravity="start" tells DrawerLayout to treat this as a sliding drawer on the left side for left-to-right languages and on the right side for right-to-left languages. If you're not building against API 17 or higher, use android:layout_gravity="left" instead. --> <!-- The drawer is given a fixed width in dp and extends the full height of the container. --> <fragment android:id="@+id/navigation_drawer" android:layout_width="@dimen/navigation_drawer_width" android:layout_height="match_parent" android:layout_gravity="start" android:name="lazarko.pocketformulas.NavigationDrawerFragment" tools:layout="@layout/fragment_navigation_drawer" /> </android.support.v4.widget.DrawerLayout>

Y mi clase de actividad de inicio de sesión:

 /** * Created by lazarnikolov on 11/8/14. */ public class Login extends Activity{ EditText etEmail, etPassword; Button bLogin, bRegister; Typeface font; TextView tvLogIn; @Override protected void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); SharedPreferences preferences = getSharedPreferences("loginData", 0); boolean loggedIn = preferences.getBoolean("loggedIn", false); if(loggedIn) { Intent intent = new Intent("android.intent.action.TIMELINE"); startActivity(intent); } SharedPreferences initialFragmentData = getSharedPreferences("fragmentData", 0); SharedPreferences.Editor initialEditorFragmentData = initialFragmentData.edit(); initialEditorFragmentData.putString("currentFragment", "TIMELINE_FRAGMENT"); initialEditorFragmentData.commit(); setContentView(R.layout.login); font = Typeface.createFromAsset(getAssets(), "ubuntu.ttf"); etEmail = (EditText) findViewById(R.id.etEmail); etEmail.setTypeface(font); etPassword = (EditText) findViewById(R.id.etPassword); etPassword.setTypeface(font); tvLogIn = (TextView) findViewById(R.id.tvRegister); tvLogIn.setTypeface(font); bLogin = (Button) findViewById(R.id.bLogin); bLogin.setTypeface(font); bLogin.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { SharedPreferences preferences = getSharedPreferences("loginData", 0); SharedPreferences.Editor editor = preferences.edit(); editor.putBoolean("loggedIn", true); editor.commit(); communicate(); Intent intent = new Intent("android.intent.action.TIMELINE"); //intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); } }); bRegister = (Button) findViewById(R.id.bRegister); bRegister.setTypeface(font); bRegister.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intent = new Intent("android.intent.action.REGISTER"); startActivity(intent); } }); } // SERVER COMMUNICATION CLASS INITIALIZATION private void communicate() { new GetData().execute(); } // SERVER COMMUNICATION CLASS private class GetData extends AsyncTask<Void, Void, String> { @Override protected String doInBackground(Void... voids) { Looper.prepare(); String data = ""; InputStream inputStream = null; try { HttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost("*******"); String json = ""; JSONObject object = new JSONObject(); object.accumulate("email", etEmail.getText().toString()); object.accumulate("password", etPassword.getText().toString()); json = object.toString(); StringEntity se = new StringEntity(json); httpPost.setEntity(se); httpPost.setHeader("Accept", "application/json"); httpPost.setHeader("Content-type", "application/json"); HttpResponse response = httpClient.execute(httpPost); inputStream = response.getEntity().getContent(); if(inputStream != null){ Toast.makeText(getApplicationContext(), "Logged in!", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(getApplicationContext(), "Invalid username/password", Toast.LENGTH_SHORT).show(); } } catch(Exception e) { Log.e("log_tag", "Error in http connection: " + e.toString()); } return data; } @Override protected void onPostExecute(String result) { //Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show(); } } @Override onStart(), onRestart(), onResume()... }

He estado buscando demasiado tiempo y todavía no pude encontrar una solución. Por favor, eche un vistazo y me publicar lo que usted piensa que es el problema!

¡Muchas gracias!

Mira más cerca / depurar lazarko.pocketformulas.NavigationDrawerFragment.java línea 209 (pertenece al método selectItem() )
De acuerdo con su traza de pila puede tener un objeto null o no correctamente inicializado allí

Actualización Para llegar a la razón de por qué alguna vez sucede y alguna vez no (si entiendo correctamente) hay más preguntas que hacer.
1) ¿Sucede cuando comienza su actividad después de un tiempo? Si es así, puede estar vinculado al hecho de que el sistema ha liberado los recursos y su actividad es recreada

2) Si no – usted tiene que mover paso a paso para encontrar la razón.
Rastrea donde el objeto obtiene nulled. Puede ser:
– al volver a crear el objeto principal (cuando no lo inicializa correctamente)
– dentro de su clase (sólo ctrl + f todas las ocurrencias)
– fuera de su clase. Para rastrear este objeto make private y declarar el método setter

Ok, he arreglado el error. He estado usando la Bandera equivocada para la intención. Esta es la solución:

 intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

He insertado esto donde estoy iniciando la actividad Timeline, y en el botón Log Out también. Ahora no consigo ese error de NullPointerException en setContentView.