Compartir imagen desde android – Share Image

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/btnShare"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/str_share" />

</RelativeLayout>

<string name="str_share">Compartir</string>

Button btnShare = ((Button)findViewById(R.id.btnShare));  
    btnShare.setOnClickListener(
      new View.OnClickListener() {
        public void onClick(View view) {
          SharePic();
      }});

01  private void SharePic()
02  { 
03   //Se carga la imagen que se quiere compartir
04   Bitmap icon = BitmapFactory.decodeResource(getResources(), R.drawable.dd);
05   //Se guarda la imagen en la SDCARD
06   ByteArrayOutputStream bytes = new ByteArrayOutputStream();
07   icon.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
08   File f = new File( Environment.getExternalStorageDirectory() + File.separator + 
09     "tmp" + File.separator + "peter.jpg");  
10   try {
11       f.createNewFile();
12       FileOutputStream fo = new FileOutputStream(f);
13       fo.write(bytes.toByteArray());
14   } catch (IOException e) {                       
15       Log.e("ERROR", e.getMessage() );
16   }  
17   //compartir imagen
18   Intent share = new Intent(Intent.ACTION_SEND);
19   share.setType("image/jpeg");
20   share.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(f));
21   share.putExtra(Intent.EXTRA_TEXT, "Mi imagen");
22   startActivity(Intent.createChooser(share, "Compartir imagen")); 
23  }

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>