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);  }}