Android - How can we call some specific function when we click on app's home screen widget?

Question

I am making an app which will have a simple home screen widget( A simple imageview ).

What i want is to call some specific function like abc() or xyz() whenever i click on this imageview widget on my homescreen.

I have gone through so many examples but did not find a single one which could teach me this and 90% of the example were using TextView which has a function setTextViewText so TextView one is simple but how to call some specific function when we click on imageview or how to set onClick for ImageButton.

Please help and i would really appreciate if you provide me some piece of code.

Thanks.

public class Sample extends Activity {

public static final String TAG = "Sample";
public void onCreate(Bundle saveInstanceState)
{
    Log.e(TAG, "I am HERE");
    Toast.makeText(this, "You Just Pressed Me", Toast.LENGTH_LONG).show();
}
}

HEre is my update method -

public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
{
    for(int i = 0; i < appWidgetIds.length; i++)
     {
         int appWidgetId = appWidgetIds[i];
         Intent intent = new Intent(context, Sample.class);
         //intent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
         //intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
         PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
         RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.hswidget);
         views.setOnClickPendingIntent(R.id.widget, pendingIntent);

         appWidgetManager.updateAppWidget(appWidgetId, views);
     }
}

Answer 1

Varundroid,

I don't think you can have a specific function launch on Widget click, but you can launch an Activity using a PendingIntent. That's how mine is currently setup, and all the Widget consist of is an ImageView. Here is my implementation...

XML:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <ImageView 
        android:layout_width="64dp" 
        android:layout_height="64dp"
        android:src="@drawable/icon" 
        android:id="@+id/widget_image" 
        android:scaleType="centerCrop"
        android:layout_centerInParent="true"/>

</RelativeLayout>

Code:

public class WidgetProvider extends AppWidgetProvider {

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        final int N = appWidgetIds.length;
        for (int i=0; i<N; i++) {
            int appWidgetId = appWidgetIds[i];

            /* Create the PendingIntent for a QuickNote */
            Intent intent = new Intent(context, ItemEdit.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

         // Get the layout for the App Widget and attach an on-click listener to the button
            RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_provider);
            views.setOnClickPendingIntent(R.id.widget_image, pendingIntent);

            // Tell the AppWidgetManager to perform an update on the current App Widget
            appWidgetManager.updateAppWidget(appWidgetId, views);
        }
    }
}

Don't forget AndroidManifest.xml!

    <receiver android:name=".WidgetProvider">
        <intent-filter>
            <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
        </intent-filter>
        <meta-data android:name="android.appwidget.provider"
           android:resource="@xml/appwidget_provider" />
    </receiver>

Answer 2

i don't understand what's your problem, but your problem mention above has very simple answer like instantiating imageview by

ImageView imgView=findViewById(R.id.imgView);

and then set onClickListner to

imgView.setOnClickListener(new view.OnClickListener(){

public void onClick(View view){
//call your functions
}
}
);