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.android.setupwizardlib.view; 18 19 import android.annotation.TargetApi; 20 import android.content.Context; 21 import android.content.res.TypedArray; 22 import android.graphics.Canvas; 23 import android.graphics.drawable.Drawable; 24 import android.os.Build; 25 import android.os.Build.VERSION_CODES; 26 import android.util.AttributeSet; 27 import android.view.WindowInsets; 28 import android.widget.FrameLayout; 29 import com.android.setupwizardlib.R; 30 31 /** 32 * A FrameLayout subclass that will responds to onApplyWindowInsets to draw a drawable in the top 33 * inset area, making a background effect for the navigation bar. To make use of this layout, 34 * specify the system UI visibility {@link android.view.View#SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 35 * set specify fitsSystemWindows. 36 * 37 * <p>This view is a normal FrameLayout if either of those are not set, or if the platform version 38 * is lower than Lollipop. 39 */ 40 public class StatusBarBackgroundLayout extends FrameLayout { 41 42 private Drawable statusBarBackground; 43 private Object lastInsets; // Use generic Object type for compatibility 44 StatusBarBackgroundLayout(Context context)45 public StatusBarBackgroundLayout(Context context) { 46 super(context); 47 init(context, null, 0); 48 } 49 StatusBarBackgroundLayout(Context context, AttributeSet attrs)50 public StatusBarBackgroundLayout(Context context, AttributeSet attrs) { 51 super(context, attrs); 52 init(context, attrs, 0); 53 } 54 55 @TargetApi(VERSION_CODES.HONEYCOMB) StatusBarBackgroundLayout(Context context, AttributeSet attrs, int defStyleAttr)56 public StatusBarBackgroundLayout(Context context, AttributeSet attrs, int defStyleAttr) { 57 super(context, attrs, defStyleAttr); 58 init(context, attrs, defStyleAttr); 59 } 60 init(Context context, AttributeSet attrs, int defStyleAttr)61 private void init(Context context, AttributeSet attrs, int defStyleAttr) { 62 final TypedArray a = 63 context.obtainStyledAttributes( 64 attrs, R.styleable.SuwStatusBarBackgroundLayout, defStyleAttr, 0); 65 final Drawable statusBarBackground = 66 a.getDrawable(R.styleable.SuwStatusBarBackgroundLayout_suwStatusBarBackground); 67 setStatusBarBackground(statusBarBackground); 68 a.recycle(); 69 } 70 71 @Override onAttachedToWindow()72 protected void onAttachedToWindow() { 73 super.onAttachedToWindow(); 74 if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) { 75 if (lastInsets == null) { 76 requestApplyInsets(); 77 } 78 } 79 } 80 81 @Override onDraw(Canvas canvas)82 protected void onDraw(Canvas canvas) { 83 super.onDraw(canvas); 84 if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) { 85 if (lastInsets != null) { 86 final int insetTop = ((WindowInsets) lastInsets).getSystemWindowInsetTop(); 87 if (insetTop > 0) { 88 statusBarBackground.setBounds(0, 0, getWidth(), insetTop); 89 statusBarBackground.draw(canvas); 90 } 91 } 92 } 93 } 94 setStatusBarBackground(Drawable background)95 public void setStatusBarBackground(Drawable background) { 96 statusBarBackground = background; 97 if (Build.VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) { 98 setWillNotDraw(background == null); 99 setFitsSystemWindows(background != null); 100 invalidate(); 101 } 102 } 103 getStatusBarBackground()104 public Drawable getStatusBarBackground() { 105 return statusBarBackground; 106 } 107 108 @Override onApplyWindowInsets(WindowInsets insets)109 public WindowInsets onApplyWindowInsets(WindowInsets insets) { 110 lastInsets = insets; 111 return super.onApplyWindowInsets(insets); 112 } 113 } 114