Android编程实现图片的颜色处理功能示例

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="青--红" />
  <SeekBar
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/red_seekbar"/>
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="青--绿" />
  <SeekBar
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/green_seekbar"/>
  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="青--蓝" />
  <SeekBar
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/blue_seekbar"/>
  <ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/im"
    android:src="@drawable/img_small_1"/>
</LinearLayout>

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);
  }
}