Android关于图片处理，更改图片灰度

                    1.更改图片灰度 
            packagecom.huyanrui.photomodify; 
            
            importandroid.app.Activity; 
            importandroid.graphics.ColorMatrix; 
            importandroid.graphics.ColorMatrixColorFilter; 
            importandroid.graphics.drawable.Drawable; 
            importandroid.os.Bundle; 
            importandroid.widget.ImageView; 
            
            publicclassPhotoModifyActivityextendsActivity{ 
            /**Calledwhentheactivityisfirstcreated.*/
            @Override
            publicvoidonCreate(BundlesavedInstanceState){ 
            super.onCreate(savedInstanceState); 
            setContentView(R.layout.main); 
            ImageViewimageView=(ImageView)findViewById(R.id.imageView); 
            ImageViewimageView2=(ImageView)findViewById(R.id.imageView2); 
            imageView2.setImageDrawable(huidu(R.drawable.icon)); 
            
            } 
            //@paramid图片的ID 
            privateDrawablehuidu(intid){ 
            Drawabledrawable=getResources().getDrawable(id); 
            drawable.mutate();//更改图片灰度 
            ColorMatrixcMatrix=newColorMatrix(); 
            cMatrix.setSaturation(0); 
            ColorMatrixColorFiltercolorFilter=newColorMatrixColorFilter(cMatrix); 
            drawable.setColorFilter(colorFilter); 
            returndrawable; 
            } 
            }
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