How to start Activity from Android AppWidget?

问题:

Code like this works well.

    Intent configIntent = new Intent (context, WidgetConfigActivity.class);
    configIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    PendingIntent pIntent = PendingIntent.getActivity(context, 0, configIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    remoteView.setOnClickPendingIntent(R.id.btn, pIntent);

But I want to hide that button befor activity will appear, so I'm triing to send intent to the widget itself, perform hiding components in onReceive() method and then start activity. Problem is that I can't use startActivity() function in AppWidget.

Is there any solution ?

回答1:

Problem is that I can't use startActivity() function in AppWidget.

Yes, you can. You are passed in a Context object into onUpdate() (or onReceive()) of your AppWidgetProvider -- call startActivity() on that.

回答2:

Thanks 2 CommonsWare

There is one more thing to do. context.startActivity(); throws RuntimeException in this case.

Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?

So you need to set flag

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

before.

回答3:

   // on receive function use this for new activity start
               Intent intent = new Intent (context, AppWdget.class);
               intent.setFlags (Intent.FLAG_ACTIVITY_NEW_TASK);
               context.startActivity (intent);