Question

I have an app widget which displays some rss feeds.It contains a text view which will display news title and an image view to diplay image.In that widget I want to add two buttons which function as next and previous to navigate through news titles.I know how to do this in an activity but how can I implement onclick listener for these buttons in widget

Here is my xml=>

 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
<RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
<ImageView
            android:id="@+id/imageView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:scaleType="centerCrop"
            android:src="@drawable/logo" />
<ImageView
            android:id="@+id/imageView2"
            android:layout_width="wrap_content"
            android:layout_height="100dp"
            android:layout_alignParentLeft="true"
            android:layout_alignParentRight="true"
            android:layout_below="@+id/imageView1"
            android:scaleType="centerCrop"
            android:src="@drawable/titlebg2" />
<ImageView
            android:id="@+id/imageView3"
            android:layout_width="wrap_content"
            android:layout_height="2dp"
            android:layout_below="@+id/imageView2"
            android:layout_centerHorizontal="true"
            android:scaleType="centerCrop"
            android:src="@drawable/foot" />
<ImageView
            android:id="@+id/imageView4"
            android:layout_width="90dp"
            android:layout_height="90dp"
            android:layout_alignParentLeft="true"
            android:layout_alignTop="@+id/imageView2"
            android:layout_marginLeft="5dp"
            android:layout_marginTop="5dp"
            android:scaleType="centerCrop"
            android:src="@drawable/img" />
<Button
            android:id="@+id/next"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_alignParentRight="true"
            android:layout_below="@+id/imageView1"
            android:layout_marginRight="3dp"
            android:layout_marginTop="3dp"
            android:background="@drawable/up" />


        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@+id/up"
            android:layout_alignBottom="@+id/up"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="25dp"
            android:layout_toRightOf="@+id/imageView4"
            android:text="TextView"
            android:textColor="#ffff" />
      <Button
            android:id="@+id/previous"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_alignBottom="@+id/imageView2"
            android:layout_alignLeft="@+id/up"
            android:layout_marginBottom="3dp"
            android:background="@drawable/down" />

    </RelativeLayout>

</LinearLayout>

Follwing is my onupdate function,
=>

 public void onUpdate( Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds )
        {

         parse();//Here Iam parsing the xml
         RemoteViews remoteViews;
             ComponentName watchWidget;


            remoteViews = new RemoteViews( context.getPackageName(), R.layout.widget_main );
            watchWidget = new ComponentName( context, madhyamambig.class );

            remoteViews.setTextViewText( R.id.title, Title[0]);


            Bitmap bitmap;
            try {
                bitmap = BitmapFactory.decodeStream((InputStream)new URL(image[0]).getContent());


                 remoteViews.setImageViewBitmap(R.id.imageView4, bitmap);
            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
                            appWidgetManager.updateAppWidget( watchWidget, remoteViews );

        }

On an activity, we can simply do this like,

     int i=0;
      next.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {


 Bitmap bitmap;
                try {
                    bitmap = BitmapFactory.decodeStream((InputStream)new      URL(image[i+1]).getContent());


                     remoteViews.setImageViewBitmap(R.id.imageView4, bitmap);
                } catch (MalformedURLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                                appWidgetManager.updateAppWidget( watchWidget, remoteViews );

            }
          }


        });

I want to implement the same in widget.Somebody please help me…Thanks in advance..

Answer 1

You can use RemoteViews.setOnClickPendingIntent method.

Then launch a PendingIntent that will be caught by a service, a broadcast receiver or a service. The context targeted by this intent will be able to manipulate the source widget by using RemoteViews again.

Click processing is a bit more complicated as everything that is a stake here is to manipulate UI elements in a remote process.