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POnull pointer exception calling a method
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  1. POnull pointer exception calling a method
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    copied!<p>I have 2 activities in my app, in the second one I have the code to run when the "about" android action bar icon is clicked. In the first activity I have the same action bar menu items and I want to call this "about" method again, however when I click that, I have null Pointer exception. Anyone help ?</p> <p>this is the method defined in the second activity - JokeDetailsActivity</p> <pre><code>public void aboutMe(){ AlertDialog.Builder dialog = new AlertDialog.Builder(JokeDetailsActivity.this); dialog.setTitle("About"); dialog.setMessage("Hello! I'm ..., the creator of this application." +"If there is any bug found please freely e-mail me. "+ "\n ...." ); dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); dialog.show(); } </code></pre> <p>when I call it in the first activity</p> <pre><code>case R.id.action_about: JokeDetailsActivity jd = new JokeDetailsActivity(); jd.aboutMe(); return true; } </code></pre> <p>thats the error I'm getting</p> <pre><code>09-12 20:11:42.748: E/AndroidRuntime(1032): FATAL EXCEPTION: main 09-12 20:11:42.748: E/AndroidRuntime(1032): java.lang.NullPointerException 09-12 20:11:42.748: E/AndroidRuntime(1032): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:140) 09-12 20:11:42.748: E/AndroidRuntime(1032): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103) 09-12 20:11:42.748: E/AndroidRuntime(1032): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143) 09-12 20:11:42.748: E/AndroidRuntime(1032): at android.app.AlertDialog$Builder.&lt;init&gt;(AlertDialog.java:360) 09-12 20:11:42.748: E/AndroidRuntime(1032): at ie.myjokes.JokeDetailsActivity.aboutMe(JokeDetailsActivity.java:293) 09-12 20:11:42.748: E/AndroidRuntime(1032): at ie.myjokes.CategoryActivity.onOptionsItemSelected(CategoryActivity.java:140) 09-12 20:11:42.748: E/AndroidRuntime(1032): at android.app.Activity.onMenuItemSelected(Activity.java:2548) </code></pre>
 

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