Android开发中使用颜色矩阵改变图片颜色，透明度及亮度的方法

public class ColorImageActivity extends Activity { private ImageView mImageView; private SeekBar mSBRed,mSBGreen,mSBBlue,mSBAlpha,mSBLight; //修改后的图片 private Bitmap mModBitmap; //画布 private Canvas mCanvas; //画笔 private Paint mPaint; //颜色矩阵 private ColorMatrix mColorMatrix; //图片矩阵 private Matrix mMatrix; //原图 private Bitmap mBitmap; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_image_color);  initViews(); } private void initViews() {  mImageView = (ImageView) findViewById(R.id.imageView1);  mSBRed = (SeekBar) findViewById(R.id.seekBar1);  mSBGreen = (SeekBar) findViewById(R.id.seekBar2);  mSBBlue = (SeekBar) findViewById(R.id.seekBar3);  mSBAlpha = (SeekBar) findViewById(R.id.seekBar4);  mSBLight = (SeekBar) findViewById(R.id.seekBar5);  mSBRed.setOnSeekBarChangeListener(new RedChangeListener());  mSBGreen.setOnSeekBarChangeListener(new GreenChangeListener());  mSBBlue.setOnSeekBarChangeListener(new BlueChangeListener());  mSBAlpha.setOnSeekBarChangeListener(new AlphaChangeListener());  mSBLight.setOnSeekBarChangeListener(new LightChangeListener());  //创建原图  mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.mm0);  //创建修改的图  mModBitmap = Bitmap.createBitmap(mBitmap.getWidth()+20, mBitmap.getHeight()+20, mBitmap.getConfig());  mCanvas = new Canvas(mModBitmap);  mPaint = new Paint();  mPaint.setColor(Color.BLACK);  mPaint.setAntiAlias(true);  mMatrix = new Matrix();  mColorMatrix = new ColorMatrix();  mPaint.setColorFilter(new ColorMatrixColorFilter(mColorMatrix));  //绘制原图  mCanvas.drawBitmap(mBitmap, mMatrix, mPaint);  mImageView.setImageBitmap(mModBitmap); } private class RedChangeListener implements OnSeekBarChangeListener{  @Override  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {  }  @Override  public void onStartTrackingTouch(SeekBar seekBar) {  }  @Override  public void onStopTrackingTouch(SeekBar seekBar) {   int progess = seekBar.getProgress();   mColorMatrix.set(new float[]{     progess /128.0f,0,0,0,0,     0,1,0,0,0,     0,0,1,0,0,     0,0,0,1,0,   });   mPaint.setColorFilter(new ColorMatrixColorFilter(mColorMatrix));   mCanvas.drawBitmap(mBitmap, mMatrix, mPaint);   mImageView.setImageBitmap(mBitmap);  } } private class GreenChangeListener implements OnSeekBarChangeListener{  @Override  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {  }  @Override  public void onStartTrackingTouch(SeekBar seekBar) {  }  @Override  public void onStopTrackingTouch(SeekBar seekBar) {   int progess = seekBar.getProgress();   mColorMatrix.set(new float[]{     1,0,0,0,0,     0,progess/128.0f,0,0,0,     0,0,1,0,0,     0,0,0,1,0,   });   mPaint.setColorFilter(new ColorMatrixColorFilter(mColorMatrix));   mCanvas.drawBitmap(mBitmap, mMatrix, mPaint);   mImageView.setImageBitmap(mModBitmap);  } } private class BlueChangeListener implements OnSeekBarChangeListener{  @Override  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {  }  @Override  public void onStartTrackingTouch(SeekBar seekBar) {  }  @Override  public void onStopTrackingTouch(SeekBar seekBar) {   int progess = seekBar.getProgress();   mColorMatrix.set(new float[]{     1,0,0,0,0,     0,1,0,0,0,     0,0,progess/128.0f,0,0,     0,0,0,1,0,   });   mPaint.setColorFilter(new ColorMatrixColorFilter(mColorMatrix));   mCanvas.drawBitmap(mBitmap, mMatrix, mPaint);   mImageView.setImageBitmap(mModBitmap);  } } private class AlphaChangeListener implements OnSeekBarChangeListener{  @Override  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {  }  @Override  public void onStartTrackingTouch(SeekBar seekBar) {  }  @Override  public void onStopTrackingTouch(SeekBar seekBar) {   int progess = seekBar.getProgress();   mColorMatrix.set(new float[]{     1,0,0,0,0,     0,1,0,0,0,     0,0,1,0,0,     0,0,0,progess/50.0f,0,   });   mPaint.setColorFilter(new ColorMatrixColorFilter(mColorMatrix));   mCanvas.drawBitmap(mBitmap, mMatrix, mPaint);   mImageView.setImageBitmap(mModBitmap);  } } //更改亮度 private class LightChangeListener implements OnSeekBarChangeListener{  @Override  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {  }  @Override  public void onStartTrackingTouch(SeekBar seekBar) {  }  @Override  public void onStopTrackingTouch(SeekBar seekBar) {   int progess = seekBar.getProgress();   mColorMatrix.set(new float[]{     progess/128.0f,0,0,0,0,     0,progess/128.0f,0,0,0,     0,0,progess/128.0f,0,0,     0,0,0,1,0,   });   mPaint.setColorFilter(new ColorMatrixColorFilter(mColorMatrix));   mCanvas.drawBitmap(mBitmap, mMatrix, mPaint);   mImageView.setImageBitmap(mModBitmap);  } }}