1 /*
2  * Copyright (C) 2020 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 
17 package com.android.test.hwui;
18 
19 import android.app.Activity;
20 import android.content.Context;
21 import android.graphics.Canvas;
22 import android.graphics.Color;
23 import android.graphics.LinearGradient;
24 import android.graphics.Paint;
25 import android.graphics.RenderEffect;
26 import android.graphics.RenderNode;
27 import android.graphics.Shader;
28 import android.os.Bundle;
29 import android.view.Gravity;
30 import android.view.View;
31 import android.widget.LinearLayout;
32 
33 @SuppressWarnings({"UnusedDeclaration"})
34 public class RenderEffectShaderActivity extends Activity {
35     @Override
onCreate(Bundle savedInstanceState)36     protected void onCreate(Bundle savedInstanceState) {
37         super.onCreate(savedInstanceState);
38 
39         LinearLayout layout = new LinearLayout(this);
40         layout.setClipChildren(false);
41         layout.setGravity(Gravity.CENTER);
42         layout.setOrientation(LinearLayout.VERTICAL);
43 
44 
45         LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(500, 500);
46         params.bottomMargin = 100;
47 
48         layout.addView(new ShaderRenderEffectView(this), params);
49 
50         setContentView(layout);
51     }
52 
53     public static class ShaderRenderEffectView extends View {
54 
55         private final Paint mPaint;
56         private final RenderNode mRenderNode;
57 
ShaderRenderEffectView(Context c)58         public ShaderRenderEffectView(Context c) {
59             super(c);
60 
61             mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
62             mRenderNode = new RenderNode("blurNode");
63 
64         }
65 
66         @Override
onLayout(boolean changed, int left, int top, int right, int bottom)67         protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
68             if (changed) {
69                 LinearGradient gradient = new LinearGradient(
70                         0f, 0f,
71                         0f, bottom - top,
72                         new int[]{Color.CYAN, Color.MAGENTA},
73                         null,
74                         Shader.TileMode.CLAMP
75                 );
76                 mRenderNode.setRenderEffect(
77                         RenderEffect.createShaderEffect(gradient)
78                 );
79 
80                 int width = right - left;
81                 int height = bottom - top;
82                 mRenderNode.setPosition(0, 0, width, height);
83                 Canvas canvas = mRenderNode.beginRecording(width, height);
84                 mPaint.setColor(Color.BLUE);
85 
86                 canvas.drawRect(
87                         0,
88                         0,
89                         width,
90                         height,
91                         mPaint
92                 );
93 
94                 mPaint.setColor(Color.RED);
95                 canvas.drawCircle((right - left) / 2f, (bottom - top) / 2f, 50f, mPaint);
96 
97                 mRenderNode.endRecording();
98             }
99         }
100 
101         @Override
onDraw(Canvas canvas)102         protected void onDraw(Canvas canvas) {
103             super.onDraw(canvas);
104             canvas.drawRenderNode(mRenderNode);
105         }
106     }
107 }
108