protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SeekBar sb = (SeekBar) findViewById(R.id.sb);
final ImageView iv = (ImageView) findViewById(R.id.iv);
//找到原图
final Bitmap srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.a1);
//复制副本
final Bitmap copyBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig());
//开始编辑
final Canvas canvas=new Canvas(copyBitmap);
final Matrix matrix=new Matrix();
final Paint paint=new Paint();
canvas.drawBitmap(srcBitmap, matrix, paint);
//根据seekbar设置颜色
sb.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
int progress = seekBar.getProgress();
float val = progress / 50.0f;// val 值 0 ~ 1 ~ 2
//val 0~1 0.5 偏青
//val 1~2 1.5 偏红
//颜色数组，调色调 颜色可以随便改
ColorMatrix cm = new ColorMatrix();
cm.set(new float[] {
1 , 0, 0, 0, 0, //红色R
0, 1* val, 0, 0, 0, //绿色G
0, 0, 1, 0, 0, //蓝色B
0, 0, 0, 1, 0 //透明度A
});
paint.setColorFilter(new ColorMatrixColorFilter(cm));
canvas.drawBitmap(srcBitmap, matrix, paint);
iv.setImageBitmap(copyBitmap);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
}
});
//将图写入iv
iv.setImageBitmap(copyBitmap);
}
