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POAlertDialog in Android - Null Pointer Exception
 

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    <p>I looked online for quite a bit and am now getting frustrated cause I can't find information on the following error. Can someone please help me figure out whats going on with this?</p> <pre><code>08-17 13:15:47.800: W/dalvikvm(10356): threadid=1: thread exiting with uncaught exception (group=0x401f0760) 08-17 13:15:47.800: E/AndroidRuntime(10356): FATAL EXCEPTION: main 08-17 13:15:47.800: E/AndroidRuntime(10356): java.lang.NullPointerException 08-17 13:15:47.800: E/AndroidRuntime(10356): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:120) 08-17 13:15:47.800: E/AndroidRuntime(10356): at android.app.AlertDialog$Builder.&lt;init&gt;(AlertDialog.java:337) 08-17 13:15:47.800: E/AndroidRuntime(10356): at com.work.plan.Login$1.onClick(Login.java:64) 08-17 13:15:47.800: E/AndroidRuntime(10356): at android.view.View.performClick(View.java:3112) 08-17 13:15:47.800: E/AndroidRuntime(10356): at android.view.View$PerformClick.run(View.java:11956) 08-17 13:15:47.800: E/AndroidRuntime(10356): at android.os.Handler.handleCallback(Handler.java:587) 08-17 13:15:47.800: E/AndroidRuntime(10356): at android.os.Handler.dispatchMessage(Handler.java:92) 08-17 13:15:47.800: E/AndroidRuntime(10356): at android.os.Looper.loop(Looper.java:132) 08-17 13:15:47.800: E/AndroidRuntime(10356): at android.app.ActivityThread.main(ActivityThread.java:4025) 08-17 13:15:47.800: E/AndroidRuntime(10356): at java.lang.reflect.Method.invokeNative(Native Method) 08-17 13:15:47.800: E/AndroidRuntime(10356): at java.lang.reflect.Method.invoke(Method.java:491) 08-17 13:15:47.800: E/AndroidRuntime(10356): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 08-17 13:15:47.800: E/AndroidRuntime(10356): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 08-17 13:15:47.800: E/AndroidRuntime(10356): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>And here is the class that is causing the error :</p> <pre><code>OnClickListener LoginListener = new OnClickListener(){ public void onClick(View arg0) { String checkUserName = userName.getText().toString(); Cursor mCursor = mDbHelper.fetchUserByName(checkUserName); if(mCursor.moveToFirst()){ String checkDatabaseUser = mCursor.getString(mCursor.getColumnIndexOrThrow(LoginDbAdapter.KEY_NAME)); Toast.makeText(getBaseContext(), checkDatabaseUser,Toast.LENGTH_LONG).show(); if(checkDatabaseUser.equals(checkUserName)){ Intent i = new Intent(); i.setClass(getBaseContext(), WorkoutPlanActivity.class); startActivity(i); } }else { **//Error happening here --&gt;** AlertDialog.Builder alert = new AlertDialog.Builder(m_ClassContext); alert.setTitle("Error Logging in"); alert.setMessage("The user name is not in the system."); alert.setPositiveButton("Ok",new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub dialog.cancel(); } }); alert.show(); } } }; </code></pre> <p>I changed the alert to this </p> <pre><code>AlertDialog alert = new AlertDialog.Builder(getBaseContext()).create(); alert.setTitle("Error Logging in"); alert.setMessage("The user name is not in the system."); alert.setButton("Ok",new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub dialog.cancel(); } }); alert.show(); </code></pre> <p>And now i get the following error: </p> <pre><code>08-17 13:38:38.460: W/dalvikvm(10513): threadid=1: thread exiting with uncaught exception (group=0x401f0760) 08-17 13:38:38.460: E/AndroidRuntime(10513): FATAL EXCEPTION: main 08-17 13:38:38.460: E/AndroidRuntime(10513): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.view.ViewRoot.setView(ViewRoot.java:450) 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:181) 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:95) 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.app.Dialog.show(Dialog.java:269) 08-17 13:38:38.460: E/AndroidRuntime(10513): at com.work.plan.Login$1.onClick(Login.java:74) 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.view.View.performClick(View.java:3112) 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.view.View$PerformClick.run(View.java:11956) 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.os.Handler.handleCallback(Handler.java:587) 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.os.Handler.dispatchMessage(Handler.java:92) 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.os.Looper.loop(Looper.java:132) 08-17 13:38:38.460: E/AndroidRuntime(10513): at android.app.ActivityThread.main(ActivityThread.java:4025) 08-17 13:38:38.460: E/AndroidRuntime(10513): at java.lang.reflect.Method.invokeNative(Native Method) 08-17 13:38:38.460: E/AndroidRuntime(10513): at java.lang.reflect.Method.invoke(Method.java:491) 08-17 13:38:38.460: E/AndroidRuntime(10513): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 08-17 13:38:38.460: E/AndroidRuntime(10513): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 08-17 13:38:38.460: E/AndroidRuntime(10513): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>This ended up being the solution, Thanks guys</p> <pre><code>private Context m_ClassContext = this; AlertDialog alert = new AlertDialog.Builder(m_ClassContext).create(); alert.setTitle("Error Logging in"); alert.setMessage("The user name is not in the system."); alert.setButton("Ok",new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub dialog.cancel(); } }); alert.show(); </code></pre>
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    1. COCan you show more of your class? Specifically the declaration and definition of `m_ClassContext`?
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    2. COis `com.work.plan.Login$1.onClick(Login.java:64)` one of your classes? whats happening in line 64? Is this the marked line?
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    3. COcan you post the manifest xml. maybe its related to theme
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