代码摘自网络，仅供参考

import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import com.enrique.stackblur.StackBlurManager;
public class MainActivity extends Activity {
    
	private ImageView    iv;
	private SeekBar      seekBar;
	private StackBlurManager stackBlurManager;
	private String IMAGE_TO_ANALYZE = "android_platform_256.png";
	private int blurMode=0;
	private int radius=30;
	private int step=2;
	Handler handler = new Handler();
	Runnable runnable = new Runnable() {
		@Override
		public void run() {
			// TODO Auto-generated method stub
			radius -= step;
			if (radius < 0) {
				handler.removeCallbacks(runnable);
				return;
			}
			onBlur(radius);
			handler.postDelayed(this, 30);
		}
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		iv=(ImageView)findViewById(R.id.imageView);
		seekBar=(SeekBar)findViewById(R.id.blur_amount);
		
		stackBlurManager = new StackBlurManager(getBitmapFromAsset(this, "av.png"));
		onBlur(radius);
		
		handler.postDelayed(runnable, 1000);
		
		seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
			
			@Override
			public void onStopTrackingTouch(SeekBar seekBar) {
				
			}
			
			@Override
			public void onStartTrackingTouch(SeekBar seekBar) {
				
			}
			
			@Override
			public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
				int radius = progress;
				onBlur(radius);
			}
		});
		
	}
	
	private Bitmap getBitmapFromAsset(Context context, String strName) {
        AssetManager assetManager = context.getAssets();
        InputStream is=null;
        Bitmap bitmap = null;
        try {
            is = assetManager.open(strName);
            bitmap = BitmapFactory.decodeStream(is);
        } catch (IOException e) {
            return null;
        }
        return bitmap;
    }
	public void setBlurMode(int mode) {
		this.blurMode = mode;
		onBlur(radius);
	}
	private void onBlur(int radius) {
		switch(blurMode) {
			case 0:
				iv.setImageBitmap( stackBlurManager.process(radius) );
				break;
			case 1:
				iv.setImageBitmap( stackBlurManager.processNatively(radius) );
				break;
			case 2:
				iv.setImageBitmap( stackBlurManager.processRenderScript(this, radius) );
				break;
		}
	}
}

XML

<LinearLayout 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:background="#FFF"
    android:gravity="center_horizontal"
    android:orientation="vertical" >
    <SeekBar
        android:id="@+id/blur_amount"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="50" />
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
</LinearLayout>

下面提供一个C++版本的，效率高很多嘛，不多说。github地址: ImageBlurring
本地下载:ImageBlurring-master

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