Android关于图片处理，更改图片灰度

 

1.  更改图片灰度
package com.huyanrui.photomodify;

import android.app.Activity;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.ImageView;

public class PhotoModifyActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ImageView imageView = (ImageView)findViewById(R.id.imageView);
        ImageView imageView2 = (ImageView)findViewById(R.id.imageView2);
        imageView2.setImageDrawable(huidu(R.drawable.icon));

    }
    //@param id 图片的ID
    private Drawable huidu(int id){
         Drawable drawable  = getResources().getDrawable(id);
         drawable.mutate();//更改图片灰度
         ColorMatrix cMatrix  = new ColorMatrix();
         cMatrix.setSaturation(0);
         ColorMatrixColorFilter colorFilter  = new ColorMatrixColorFilter(cMatrix);
         drawable.setColorFilter(colorFilter);
         return drawable;
    }
}