Android: NPE when trying actionForResult with intent ACTION_APPWIDGET_PICK
I am having a problem trying to set an intent with AppWidgetManager.ACTION_APPWIDGET_PICK
. There is a problem inside the Android AppWidget ecosystem as I can see from the logs. What am I doing wrong?
See Sample Code and Stack Trace below
public class NPEDemoActivity extends Activity {
private final static int HOST_CODE = 1024;
private AppWidgetHost host;
private AppWidgetManager manager;
private int PICK_WIDGET_RC = 1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
host = new AppWidgetHost(this, HOST_CODE);
host.startListening();
manager = AppWidgetManager.getInstance(this);
Button b = (Button)findViewById(R.id.Button01);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int nextId = host.allocateAppWidgetId();
Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK);
pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, nextId);
startActivityForResult(pickIntent, PICK_WIDGET_RC);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
}
}
stack trace from cat log:
10-15 17:33:06.873: ERROR/AndroidRuntime(821): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.settings/com.android.settings.AppWidgetPickActivity}: java.lang.NullPointerException
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at android.os.Handler.dispatchMessage(Handler.java:99)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at android.os.Looper.loop(Looper.java:123)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at android.app.ActivityThread.main(ActivityThread.java:4203)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at java.lang.reflect.Method.invokeNative(Native Method)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at java.lang.reflect.Method.invoke(Method.java:521)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at dalvik.system.NativeStart.main(Native Method)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): Caused by: java.lang.NullPointerException
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at com.android.settings.AppWidgetPickActivity.putAppWidgetItems(AppWidgetPickActivity.java:170)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at com.android.settings.AppWidgetPickActivity.putCustomAppWidgets(AppWidgetPickActivity.java:132)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at com.android.settings.AppWidgetPickActivity.getItems(AppWidgetPickActivity.java:208)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at com.android.settings.ActivityPicker.onCreate(ActivityPicker.java:99)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at com.android.settings.AppWidgetPickActivity.onCreate(AppWidgetPickActivity.java:63)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
10-15 17:33:06.873: ERROR/AndroidRuntime(821): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
Another little question, which of the Android projects does com.android.settings work in? (I'm stuck on windows so can't use the repo unfortunately) Help is really appreciated.
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Edit : it's too early to say, didn't see it was a ViewListener method. I don't know if more is required.
Original answer :
You have to call Acitivy onClick
in your override.
From Android docs : "An implementation of any activity lifecycle must always call the superclass version first.
Hope that solves the problem.
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Have you identified a workaround? I have seen applications that implement an app builder to run an appwidget host in their activity and now I am getting this exact error stating that EXTRA_CUSTOM_INFO is missing. I am testing some stuff from the Launcher launcher source and reporting back if I can even workaround the error.
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