Android编程实现图片的颜色处理功能示例

本文实例讲述了Android编程实现图片的颜色处理功能。分享给大家供大家参考，具体如下：

先看效果图：

图片的颜色处理的基本步骤：

1.先拿到一张原图
2.拿到一张和原图一样的纸
3.把纸固定在画板上
4.颜色的取值
5.进度条的拖动与监听

代码编写：

布局：

activity：

public class MainActivity extends Activity implements OnSeekBarChangeListener{
  private SeekBar red_sb,green_sb,blue_sb;
  private ImageView imageView;
  private Canvas canvas;
  private Paint paint;
  private Bitmap baseBitmap,copyBitmap;
  private float red_vector,green_vector,blue_vector;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    red_sb=(SeekBar) findViewById(R.id.red_seekbar);
    green_sb=(SeekBar) findViewById(R.id.green_seekbar);
    blue_sb=(SeekBar) findViewById(R.id.blue_seekbar);
    imageView=(ImageView) findViewById(R.id.im);
    red_sb.setOnSeekBarChangeListener(this);
    green_sb.setOnSeekBarChangeListener(this);
    blue_sb.setOnSeekBarChangeListener(this);
  }
  @Override
  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    // TODO Auto-generated method stub
  }
  @Override
  public void onStartTrackingTouch(SeekBar seekBar) {
    // TODO Auto-generated method stub
  }
  @Override
  public void onStopTrackingTouch(SeekBar seekBar) {
    // TODO Auto-generated method stub
    int progress=seekBar.getProgress();
    float count=progress/50f;//使拖动条的取值为0f-2f,满足我们的取值要求
    switch (seekBar.getId()) {
    case R.id.red_seekbar:
      this.red_vector=count;
      break;
    case R.id.green_seekbar:
      this.green_vector=count;
      break;
    case R.id.blue_seekbar:
      this.blue_vector=count;
      break;
    default:
      break;
    }
    //主题代码
    baseBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.img_small_1);
    copyBitmap=Bitmap.createBitmap(baseBitmap.getWidth(), baseBitmap.getHeight(), baseBitmap.getConfig());
    canvas=new Canvas(copyBitmap);
    Matrix matrix=new Matrix();
    paint=new Paint();
    //vector：取值范围(0-2)
    float[] colors=new float[]{
        red_vector,0,0,0,0,
        0,green_vector,0,0,0,
        0,0,blue_vector,0,0,
        0,0,0,1,0};
    paint.setColorFilter(new ColorMatrixColorFilter(colors));
    canvas.drawBitmap(baseBitmap, matrix, paint);
    imageView.setImageBitmap(copyBitmap);
  }
}

更多关于Android相关内容感兴趣的读者可查看本站专题：《Android图形与图像处理技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》

希望本文所述对大家Android程序设计有所帮助。