1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.example.android.apis.graphics;
18
19import android.content.Context;
20import android.graphics.*;
21import android.os.Bundle;
22import android.view.*;
23
24public class Layers extends GraphicsActivity {
25
26    @Override
27    protected void onCreate(Bundle savedInstanceState) {
28        super.onCreate(savedInstanceState);
29        setContentView(new SampleView(this));
30    }
31
32    private static class SampleView extends View {
33        private static final int LAYER_FLAGS = Canvas.MATRIX_SAVE_FLAG |
34                                            Canvas.CLIP_SAVE_FLAG |
35                                            Canvas.HAS_ALPHA_LAYER_SAVE_FLAG |
36                                            Canvas.FULL_COLOR_LAYER_SAVE_FLAG |
37                                            Canvas.CLIP_TO_LAYER_SAVE_FLAG;
38
39        private Paint mPaint;
40
41        public SampleView(Context context) {
42            super(context);
43            setFocusable(true);
44
45            mPaint = new Paint();
46            mPaint.setAntiAlias(true);
47        }
48
49        @Override protected void onDraw(Canvas canvas) {
50            canvas.drawColor(Color.WHITE);
51
52            canvas.translate(10, 10);
53
54            canvas.saveLayerAlpha(0, 0, 200, 200, 0x88, LAYER_FLAGS);
55
56            mPaint.setColor(Color.RED);
57            canvas.drawCircle(75, 75, 75, mPaint);
58            mPaint.setColor(Color.BLUE);
59            canvas.drawCircle(125, 125, 75, mPaint);
60
61            canvas.restore();
62        }
63    }
64}
65
66