1 /* 2 * Copyright (C) 2015 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.google.android.setupcompat.view; 18 19 import android.annotation.TargetApi; 20 import android.content.Context; 21 import android.graphics.Canvas; 22 import android.graphics.drawable.Drawable; 23 import android.os.Build; 24 import android.os.Build.VERSION_CODES; 25 import android.util.AttributeSet; 26 import android.view.WindowInsets; 27 import android.widget.FrameLayout; 28 29 /** 30 * A FrameLayout subclass that will responds to onApplyWindowInsets to draw a drawable in the top 31 * inset area, making a background effect for the navigation bar. To make use of this layout, 32 * specify the system UI visibility {@link android.view.View#SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 33 * set specify fitsSystemWindows. 34 * 35 * <p>This view is a normal FrameLayout if either of those are not set, or if the platform version 36 * is lower than Lollipop. 37 */ 38 public class StatusBarBackgroundLayout extends FrameLayout { 39 40 private Drawable statusBarBackground; 41 private Object lastInsets; // Use generic Object type for compatibility 42 StatusBarBackgroundLayout(Context context)43 public StatusBarBackgroundLayout(Context context) { 44 super(context); 45 } 46 StatusBarBackgroundLayout(Context context, AttributeSet attrs)47 public StatusBarBackgroundLayout(Context context, AttributeSet attrs) { 48 super(context, attrs); 49 } 50 51 @TargetApi(VERSION_CODES.HONEYCOMB) StatusBarBackgroundLayout(Context context, AttributeSet attrs, int defStyleAttr)52 public StatusBarBackgroundLayout(Context context, AttributeSet attrs, int defStyleAttr) { 53 super(context, attrs, defStyleAttr); 54 } 55 56 @Override onAttachedToWindow()57 protected void onAttachedToWindow() { 58 super.onAttachedToWindow(); 59 if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) { 60 if (lastInsets == null) { 61 requestApplyInsets(); 62 } 63 } 64 } 65 66 @Override onDraw(Canvas canvas)67 protected void onDraw(Canvas canvas) { 68 super.onDraw(canvas); 69 if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) { 70 if (lastInsets != null) { 71 final int insetTop = ((WindowInsets) lastInsets).getSystemWindowInsetTop(); 72 if (insetTop > 0) { 73 statusBarBackground.setBounds(0, 0, getWidth(), insetTop); 74 statusBarBackground.draw(canvas); 75 } 76 } 77 } 78 } 79 setStatusBarBackground(Drawable background)80 public void setStatusBarBackground(Drawable background) { 81 statusBarBackground = background; 82 if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) { 83 setWillNotDraw(background == null); 84 setFitsSystemWindows(background != null); 85 invalidate(); 86 } 87 } 88 getStatusBarBackground()89 public Drawable getStatusBarBackground() { 90 return statusBarBackground; 91 } 92 93 @Override onApplyWindowInsets(WindowInsets insets)94 public WindowInsets onApplyWindowInsets(WindowInsets insets) { 95 lastInsets = insets; 96 return super.onApplyWindowInsets(insets); 97 } 98 } 99