Detect rotation of Android home screen

Question

I have an App Widget which, when it updates, fetches an image having dimensions to match the widget, and places that image into an ImageView (via RemoteViews). It works just fine.

But for devices that support rotation of the home screen (and I'm not talking about rotation of e.g. an Activity based on device orientation, but about rotation of the home screen itself) the dimensions and aspect ratio of the widget changes a bit when going from landscape to portrait and vice versa... i.e. a fixed size is not maintained.

So, my widget needs to be able to detect when the home screen rotates, and fetch a new image (or at least load a different pre-fetched image).

I can't for the life of me work out whether and how this is possible. Any clues?

Answer 1

Use below code to detect orientation:-

    View view = getWindow().getDecorView();     int orientation = getResources().getConfiguration().orientation;      if (Configuration.ORIENTATION_LANDSCAPE == orientation) {        relativeLayout.setBackgroundDrawable(getResources().getDrawable(R.drawable.log_landscape));         imageview_Logo.setImageResource(R.drawable.log_landscape_2);         Log.d("Landscape", String.valueOf(orientation));         //Do SomeThing; // Landscape     } else {        relativeLayout.setBackgroundDrawable( getResources().getDrawable(R.drawable.login_bg) );        imageview_Logo.setImageResource(R.drawable.logo_login);         //Do SomeThing;  // Portrait         Log.d("Portrait", String.valueOf(orientation));     } 

Answer 2

You can listen for broadcast ACTION_CONFIGURATION_CHANGED which is sent by android system when the current device Configuration (orientation, locale, etc) has changed. As per documentation :

ACTION_CONFIGURATION_CHANGED :

Broadcast Action: The current device Configuration (orientation, locale, etc) has changed. When such a change happens, the UIs (view hierarchy) will need to be rebuilt based on this new information; for the most part, applications don't need to worry about this, because the system will take care of stopping and restarting the application to make sure it sees the new changes. Some system code that can not be restarted will need to watch for this action and handle it appropriately.

You cannot receive this through components declared in manifests, only by explicitly registering for it with Context.registerReceiver().

This is a protected intent that can only be sent by the system.

public class YourWidgetProvider extends AppWidgetProvider {          @Override         public void onEnabled(Context context) {             super.onEnabled(context);             context.registerReceiver(mOrientationChangeReceiver,new IntentFilter(Intent.ACTION_CONFIGURATION_CHANGED));         }          @Override         public void onDisabled(Context context) {             context.unregisterReceiver(mOrientationChangeReceiver);             super.onDisabled(context);         }          public BroadcastReceiver mOrientationChangeReceiver = new BroadcastReceiver() {             @Override             public void onReceive(Context context, Intent myIntent) {                 if ( myIntent.getAction().equals(Intent.ACTION_CONFIGURATION_CHANGED)) {                     if(context.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE){                         // landscape orientation                         //write logic for building remote view here                         // buildRemoteViews();                     }                     else {                         //portrait orientation                         //write logic for building remote view here                         // buildRemoteViews();                     }                 }             }         };     }