sdk/sources/android-23/com/android/test/hwui/NewLayersActivity.java

   1 /*
   2  * Copyright (C) 2010 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.Paint;
  23 import android.os.Bundle;
  24 import android.view.View;
  25
  26 @SuppressWarnings({"UnusedDeclaration"})
  27 public class NewLayersActivity extends Activity {
  28     @Override
  29     protected void onCreate(Bundle savedInstanceState) {
  30         super.onCreate(savedInstanceState);
  31         setContentView(new LayersView(this));
  32     }
  33
  34     public static class LayersView extends View {
  35         private Paint mLayerPaint;
  36         private final Paint mRectPaint;
  37
  38         public LayersView(Context c) {
  39             super(c);
  40
  41             mLayerPaint = new Paint();
  42             mLayerPaint.setAlpha(127);
  43             mRectPaint = new Paint();
  44             mRectPaint.setAntiAlias(true);
  45             mRectPaint.setTextSize(24.0f);
  46         }
  47
  48         @Override
  49         protected void onDraw(Canvas canvas) {
  50             super.onDraw(canvas);
  51             canvas.drawRGB(128, 255, 128);
  52
  53             canvas.save();
  54
  55             canvas.translate(140.0f, 100.0f);
  56             drawStuff(canvas, Canvas.ALL_SAVE_FLAG);
  57
  58             canvas.translate(0.0f, 200.0f);
  59             drawStuff(canvas, Canvas.HAS_ALPHA_LAYER_SAVE_FLAG);
  60
  61             canvas.restore();
  62         }
  63
  64         private void drawStuff(Canvas canvas, int saveFlags) {
  65             int count = canvas.saveLayer(0.0f, 0.0f, 200.0f, 100.0f, mLayerPaint, saveFlags);
  66
  67             mRectPaint.setColor(0x7fff0000);
  68             canvas.drawRect(-20.0f, -20.0f, 220.0f, 120.0f, mRectPaint);
  69
  70             mRectPaint.setColor(0xff000000);
  71             canvas.drawText("This is a very long string to overlap between layers and framebuffer",
  72                     -100.0f, 50.0f, mRectPaint);
  73
  74             canvas.restoreToCount(count);
  75         }
  76     }
  77 }