Canvas恢复布局

package com.loaderman.customviewdemo;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

public class RestoreToCountView extends View {
    private Paint mPaint;
    private String TAG = "loaderman";
    public RestoreToCountView(Context context, AttributeSet attrs) {
        super(context, attrs);

        mPaint = new Paint();
        mPaint.setColor(Color.RED);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        int id1 = canvas.save();
        canvas.clipRect(0,0,600,600);
        canvas.drawColor(Color.RED);
        Log.d(TAG, "count:" + canvas.getSaveCount() + "  id1:" + id1);

        int id2 = canvas.saveLayer(0,0,getWidth(),getHeight(),mPaint,Canvas.ALL_SAVE_FLAG);
        canvas.clipRect(100,100,500,500);
        canvas.drawColor(Color.GREEN);
        Log.d(TAG,"count:"+canvas.getSaveCount()+"  id2:"+id2);

        int id3 = canvas.saveLayerAlpha(0,0,getWidth(),getHeight(),0xf0,Canvas.ALL_SAVE_FLAG);
        canvas.clipRect(200,200,400,400);
        canvas.drawColor(Color.YELLOW);
        Log.d(TAG,"count:"+canvas.getSaveCount()+"  id3:"+id3);

        int id4 = canvas.save(Canvas.ALL_SAVE_FLAG);
        canvas.clipRect(250,250,350,350);
        canvas.drawColor(Color.BLUE);
        Log.d(TAG, "count:" + canvas.getSaveCount() + "  id4:" + id4);

//
//        canvas.restoreToCount(id3);
//        canvas.drawColor(Color.GRAY);
//        Log.d(TAG,"count:"+canvas.getSaveCount());

    }
}

效果: