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POalert dialog null inside of listener method, null pointer
 

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  1. POalert dialog null inside of listener method, null pointer
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    <p>i put an alert dialog inside a custom listener that i created, it is like a onClick listener. the listener is called when an event occurs in another class. </p> <p>why the null pointer when i put the alert dialog code inside of the listener call back method? how can i fix this? and more importantly. why do i get the null pointer?</p> <p>the listener calls the callback method onResultReturned in this Android java class, and when that happens i wanted the alert dialog to appear. </p> <p>the strange thing is that this alert dialog code works fine outside of my callback method, like when i put it in the onCreate method</p> <p>the activity i am in is StartActivity and the method onReturnResult is in this class, the other activity called, Synchronizer is where the interface for the listener is located.</p> <p>stack trace;</p> <pre><code>09-27 16:08:42.300: E/AndroidRuntime(7195): FATAL EXCEPTION: main 09-27 16:08:42.300: E/AndroidRuntime(7195): java.lang.NullPointerException 09-27 16:08:42.300: E/AndroidRuntime(7195): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:132) 09-27 16:08:42.300: E/AndroidRuntime(7195): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:65) 09-27 16:08:42.300: E/AndroidRuntime(7195): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:142) 09-27 16:08:42.300: E/AndroidRuntime(7195): at android.app.AlertDialog$Builder.&lt;init&gt;(AlertDialog.java:359) 09-27 16:08:42.300: E/AndroidRuntime(7195): at .StartActivity.onResultReturned(StartActivity.java:100) 09-27 16:08:42.300: E/AndroidRuntime(7195): at .Synchronizer$SendOutMsgAndPack$2.run(Synchronizer.java:159) 09-27 16:08:42.300: E/AndroidRuntime(7195): at android.os.Handler.handleCallback(Handler.java:605) 09-27 16:08:42.300: E/AndroidRuntime(7195): at android.os.Handler.dispatchMessage(Handler.java:92) 09-27 16:08:42.300: E/AndroidRuntime(7195): at android.os.Looper.loop(Looper.java:137) 09-27 16:08:42.300: E/AndroidRuntime(7195): at android.app.ActivityThread.main(ActivityThread.java:4424) 09-27 16:08:42.300: E/AndroidRuntime(7195): at java.lang.reflect.Method.invokeNative(Native Method) 09-27 16:08:42.300: E/AndroidRuntime(7195): at java.lang.reflect.Method.invoke(Method.java:511) 09-27 16:08:42.300: E/AndroidRuntime(7195): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) </code></pre> <p>code for my onResultReturned callback method, which is called about 4 to 5 seconds after the activity is created usually</p> <pre><code> @Override public void onResultReturned(int result) { // build allertdialog AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(StartActivity.this); // set title alertDialogBuilder.setTitle("update status"); //set allert message alertDialogBuilder .setMessage("update success") .setCancelable(false) .setPositiveButton("OK",new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog,int id) { // if this button is clicked, close // current activity //StartActivity.this.finish(); } }); // create alert dialog AlertDialog alertDialog = alertDialogBuilder.create(); // show it alertDialog.show(); </code></pre> <p>}</p>
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    1. COwhich line is line 100 in StartActivity ?
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    2. COIntent myIntent = new Intent(WorkTypeSelection.this, SettingActivity.class);, that can't be the line you are looking for, i will have to post another stack trace as is slightly changes my code in the last few minutes, but line 100 is in the general area of some onClick listeners that are unrelated to the alert dialog code.
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      1. USKevik
    3. COtry to use getAppicationContext() instead of StartActivity.this
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      1. USmananjani
 

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