Android编程之图片颜色处理方法

package net.loonggg.test; 
import android.app.Activity; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.ColorMatrix; 
import android.graphics.ColorMatrixColorFilter; 
import android.graphics.Matrix; 
import android.graphics.Paint; 
import android.os.Bundle; 
import android.widget.ImageView; 
import android.widget.SeekBar; 
import android.widget.SeekBar.OnSeekBarChangeListener; 
public class MainActivity extends Activity { 
  private SeekBar sb1, sb2, sb3, sb4, sb5; 
  private ImageView iv; 
  private Bitmap bitmap, updateBitmap; 
  private Canvas canvas; 
  private Paint paint; 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    iv = (ImageView) findViewById(R.id.iv); 
    sb1 = (SeekBar) findViewById(R.id.sb1); 
    sb2 = (SeekBar) findViewById(R.id.sb2); 
    sb3 = (SeekBar) findViewById(R.id.sb3); 
    sb4 = (SeekBar) findViewById(R.id.sb4); 
    sb5 = (SeekBar) findViewById(R.id.sb5); 
    bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.b); 
    updateBitmap = Bitmap.createBitmap(bitmap.getWidth(), 
        bitmap.getHeight(), bitmap.getConfig()); 
    canvas = new Canvas(updateBitmap); 
    paint = new Paint(); 
    final ColorMatrix cm = new ColorMatrix(); 
    paint.setColorFilter(new ColorMatrixColorFilter(cm)); 
    paint.setColor(Color.BLACK); 
    paint.setAntiAlias(true); 
    final Matrix matrix = new Matrix(); 
    canvas.drawBitmap(bitmap, matrix, paint); 
    iv.setImageBitmap(updateBitmap); 
    /** 
     * RGB三原色 红色值的设置 
     */ 
    sb1.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { 
      @Override 
      public void onStopTrackingTouch(SeekBar seekBar) { 
        int progress = seekBar.getProgress(); 
        cm.set(new float[] { progress / 128f, 0, 0, 0, 0,// 红色值 
            0, 1, 0, 0, 0,// 绿色值 
            0, 0, 1, 0, 0,// 蓝色值 
            0, 0, 0, 1, 0 // 透明度 
        }); 
        paint.setColorFilter(new ColorMatrixColorFilter(cm)); 
        canvas.drawBitmap(bitmap, matrix, paint); 
        iv.setImageBitmap(updateBitmap); 
      } 
      @Override 
      public void onStartTrackingTouch(SeekBar seekBar) { 
      } 
      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, 
          boolean fromUser) { 
      } 
    }); 
    /** 
     * RGB三原色 绿色值的设置 
     */ 
    sb2.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { 
      @Override 
      public void onStopTrackingTouch(SeekBar seekBar) { 
        int progress = seekBar.getProgress(); 
        cm.set(new float[] { 1, 0, 0, 0, 0,// 红色值 
            0, progress / 128f, 0, 0, 0,// 绿色值 
            0, 0, 1, 0, 0,// 蓝色值 
            0, 0, 0, 1, 0 // 透明度 
        }); 
        paint.setColorFilter(new ColorMatrixColorFilter(cm)); 
        canvas.drawBitmap(bitmap, matrix, paint); 
        iv.setImageBitmap(updateBitmap); 
      } 
      @Override 
      public void onStartTrackingTouch(SeekBar seekBar) { 
      } 
      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, 
          boolean fromUser) { 
      } 
    }); 
    /** 
     * RGB三原色 蓝色值的设置 
     */ 
    sb3.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { 
      @Override 
      public void onStopTrackingTouch(SeekBar seekBar) { 
        int progress = seekBar.getProgress(); 
        cm.set(new float[] { 1, 0, 0, 0, 0,// 红色值 
            0, 1, 0, 0, 0,// 绿色值 
            0, 0, progress / 128f, 0, 0,// 蓝色值 
            0, 0, 0, 1, 0 // 透明度 
        }); 
        paint.setColorFilter(new ColorMatrixColorFilter(cm)); 
        canvas.drawBitmap(bitmap, matrix, paint); 
        iv.setImageBitmap(updateBitmap); 
      } 
      @Override 
      public void onStartTrackingTouch(SeekBar seekBar) { 
      } 
      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, 
          boolean fromUser) { 
      } 
    }); 
    /** 
     * RGB三原色 三个值都改变为设置饱和度（亮度） 
     */ 
    sb4.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { 
      @Override 
      public void onStopTrackingTouch(SeekBar seekBar) { 
        int progress = seekBar.getProgress(); 
        cm.set(new float[] { progress / 128f, 0, 0, 0, 0,// 红色值 
            0, progress / 128f, 0, 0, 0,// 绿色值 
            0, 0, progress / 128f, 0, 0,// 蓝色值 
            0, 0, 0, 1, 0 // 透明度 
        }); 
        paint.setColorFilter(new ColorMatrixColorFilter(cm)); 
        canvas.drawBitmap(bitmap, matrix, paint); 
        iv.setImageBitmap(updateBitmap); 
      } 
      @Override 
      public void onStartTrackingTouch(SeekBar seekBar) { 
      } 
      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, 
          boolean fromUser) { 
      } 
    }); 
    /** 
     * RGB三原色 设置透明度 
     */ 
    sb5.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { 
      @Override 
      public void onStopTrackingTouch(SeekBar seekBar) { 
        int progress = seekBar.getProgress(); 
        cm.set(new float[] { 1, 0, 0, 0, 0,// 红色值 
            0, 1, 0, 0, 0,// 绿色值 
            0, 0, 1, 0, 0,// 蓝色值 
            0, 0, 0, progress / 128f, 0 // 透明度 
        }); 
        paint.setColorFilter(new ColorMatrixColorFilter(cm)); 
        canvas.drawBitmap(bitmap, matrix, paint); 
        iv.setImageBitmap(updateBitmap); 
      } 
      @Override 
      public void onStartTrackingTouch(SeekBar seekBar) { 
      } 
      @Override 
      public void onProgressChanged(SeekBar seekBar, int progress, 
          boolean fromUser) { 
      } 
    }); 
  } 
}