ThumbnailUtils

android.media.ThumbnailUtils, was introduced since API Level 8, Android 2.2. It's provide thumbnail generation routines for media provider.



Copy a bitmap file to /res/drawable/ folder, bitmap_1.png in my exercise.

Modify main.xml layout to have a ImageView to display the generated thumbnail.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
<ImageView
  android:id="@+id/thumbnail"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  />
</LinearLayout>

Java Code:

package com.exercise.AndroidThumbnailUtils;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.ThumbnailUtils;
import android.os.Bundle;
import android.widget.ImageView;

public class AndroidThumbnailUtils extends Activity {

private final int Thumbnail_WIDTH = 100;
private final int Thumbnail_HEIGHT = 100;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      ImageView thumbnail = (ImageView)findViewById(R.id.thumbnail);
    
      Bitmap bmSource
       = BitmapFactory.decodeResource(getResources(),
         R.drawable.bitmap_1);
    
      Bitmap bmThumbnail
       = ThumbnailUtils.extractThumbnail(bmSource,
         Thumbnail_WIDTH, Thumbnail_HEIGHT);
    
      thumbnail.setImageBitmap(bmThumbnail);
  }
}

Download the files.

Related article:
- Create thumbnail for a video using ThumbnailUtils
- Display Video thumbnail in ListView