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POCheckBox error on dialog interface
 

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  1. POCheckBox error on dialog interface
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    <p>I'm struggling in a little problem that i can not find! In my main activity i want to display an AlertDialog and have a checkbox if the user do not want display the dialog again.</p> <p>I can make the dialog appear with the checkbox, etc.. but for some reason when I try to add a OnCheckedChangeListener to the CheckBox my application closes before it starts :( </p> <p>Here is the relevant parts of my code:</p> <p>Initializing the variables for the SharedPreferences:</p> <pre><code>public final static String WEL_PREF = "Welcome Dialog Preference"; public static int welcomeChecked = 0; </code></pre> <p>Inside OnCreate:</p> <pre><code>SharedPreferences welcomePref = getSharedPreferences(WEL_PREF, MODE_PRIVATE); welcomeChecked = welcomePref.getInt("tut", 0); ... if(welcomeChecked == 1) { showAlertDialog(); } </code></pre> <p>the showAlertDialog() function:</p> <pre><code> private void showAlertDialog() { final Intent tutorial = new Intent(MainActivity.this, TutorialActivity.class); View checkBoxView = View.inflate(this, R.layout.welcome_checkbox, null); CheckBox welcomeCheck = (CheckBox) findViewById(R.id.tutCheck); welcomeCheck.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { SharedPreferences welcomePref = getSharedPreferences(WEL_PREF, MODE_PRIVATE); SharedPreferences.Editor editor = welcomePref.edit(); if(isChecked) { editor.putInt("tut", 1); editor.commit(); } else { editor.putInt("tut", 0); editor.commit(); } } }); AlertDialog.Builder welcomeDialog = new AlertDialog.Builder(this); welcomeDialog.setTitle("Welcome"); welcomeDialog.setMessage("Welcome to Formula Calculator, if you want to know how to use my features " + "click in the Tutorial button."); welcomeDialog.setView(checkBoxView); welcomeDialog.setCancelable(false); welcomeDialog.setPositiveButton("Tutorial", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { startActivity(tutorial); } }); welcomeDialog.setNegativeButton("Close", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); AlertDialog welDialog = welcomeDialog.create(); welDialog.show(); } </code></pre> <p>Thank you very much for your help! I can not find the solution why the application closes.!</p> <p>Here is the logcat if helps:</p> <pre><code>05-19 15:37:55.807: W/ActivityThread(8009): Application com.gabilheri.marcuscalculatorv2 can be debugged on port 8100... 05-19 15:37:56.127: D/AndroidRuntime(8009): Shutting down VM 05-19 15:37:56.127: W/dalvikvm(8009): threadid=1: thread exiting with uncaught exception (group=0x40c32930) 05-19 15:37:56.137: E/AndroidRuntime(8009): FATAL EXCEPTION: main 05-19 15:37:56.137: E/AndroidRuntime(8009): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gabilheri.marcuscalculatorv2/com.gabilheri.marcuscalculatorv2.MainActivity}: java.lang.NullPointerException 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.app.ActivityThread.access$600(ActivityThread.java:141) 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.os.Handler.dispatchMessage(Handler.java:99) 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.os.Looper.loop(Looper.java:137) 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.app.ActivityThread.main(ActivityThread.java:5041) 05-19 15:37:56.137: E/AndroidRuntime(8009): at java.lang.reflect.Method.invokeNative(Native Method) 05-19 15:37:56.137: E/AndroidRuntime(8009): at java.lang.reflect.Method.invoke(Method.java:511) 05-19 15:37:56.137: E/AndroidRuntime(8009): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 05-19 15:37:56.137: E/AndroidRuntime(8009): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 05-19 15:37:56.137: E/AndroidRuntime(8009): at dalvik.system.NativeStart.main(Native Method) 05-19 15:37:56.137: E/AndroidRuntime(8009): Caused by: java.lang.NullPointerException 05-19 15:37:56.137: E/AndroidRuntime(8009): at com.gabilheri.marcuscalculatorv2.MainActivity.showAlertDialog(MainActivity.java:744) 05-19 15:37:56.137: E/AndroidRuntime(8009): at com.gabilheri.marcuscalculatorv2.MainActivity.onCreate(MainActivity.java:171) 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.app.Activity.performCreate(Activity.java:5104) 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 05-19 15:37:56.137: E/AndroidRuntime(8009): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 05-19 15:37:56.137: E/AndroidRuntime(8009): ... 11 more 05-19 15:37:56.187: D/dalvikvm(8009): GC_CONCURRENT freed 219K, 5% free 7518K/7864K, paused 14ms+2ms, total 80ms </code></pre>
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    1. USMarcus Gabilheri
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