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

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" >

android:id="@+id/blur_amount"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:max="50" />

android:id="@+id/imageView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

/>

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