package com.loaderman.customviewdemo;import android.content.Context;
import android.graphics.*;
import android.util.AttributeSet;
import android.view.View;public class SaveLayerUseExample extends View {
private Paint mPaint;
private Bitmap mBitmap; public SaveLayerUseExample(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint = new Paint();
mPaint.setColor(Color.RED);
mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.dog);
;
} @Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(mBitmap, 0, 0, mPaint); int layerID = canvas.saveLayerAlpha(0, 0, 200, 200, 255, Canvas.ALL_SAVE_FLAG);
canvas.drawColor(Color.WHITE);
canvas.restoreToCount(layerID);
}
}
效果: