1 /* 2 * Copyright (C) 2012 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.internal.view; 18 19 import android.compat.annotation.UnsupportedAppUsage; 20 import android.content.Context; 21 import android.content.res.Configuration; 22 import android.content.res.Resources; 23 import android.content.res.TypedArray; 24 import android.os.Build; 25 26 import com.android.internal.R; 27 28 /** 29 * Allows components to query for various configuration policy decisions 30 * about how the action bar should lay out and behave on the current device. 31 */ 32 public class ActionBarPolicy { 33 @UnsupportedAppUsage 34 private Context mContext; 35 36 @UnsupportedAppUsage get(Context context)37 public static ActionBarPolicy get(Context context) { 38 return new ActionBarPolicy(context); 39 } 40 41 @UnsupportedAppUsage ActionBarPolicy(Context context)42 private ActionBarPolicy(Context context) { 43 mContext = context; 44 } 45 46 /** 47 * Returns the maximum number of action buttons that should be permitted within an action 48 * bar/action mode. This will be used to determine how many showAsAction="ifRoom" items can fit. 49 * "always" items can override this. 50 */ 51 @UnsupportedAppUsage getMaxActionButtons()52 public int getMaxActionButtons() { 53 final Configuration config = mContext.getResources().getConfiguration(); 54 final int width = config.screenWidthDp; 55 final int height = config.screenHeightDp; 56 final int smallest = config.smallestScreenWidthDp; 57 if (smallest > 600 || (width > 960 && height > 720) || (width > 720 && height > 960)) { 58 // For values-w600dp, values-sw600dp and values-xlarge. 59 return 5; 60 } else if (width >= 500 || (width > 640 && height > 480) || (width > 480 && height > 640)) { 61 // For values-w500dp and values-large. 62 return 4; 63 } else if (width >= 360) { 64 // For values-w360dp. 65 return 3; 66 } else { 67 return 2; 68 } 69 } 70 @UnsupportedAppUsage showsOverflowMenuButton()71 public boolean showsOverflowMenuButton() { 72 return true; 73 } 74 75 @UnsupportedAppUsage getEmbeddedMenuWidthLimit()76 public int getEmbeddedMenuWidthLimit() { 77 return mContext.getResources().getDisplayMetrics().widthPixels / 2; 78 } 79 80 @UnsupportedAppUsage hasEmbeddedTabs()81 public boolean hasEmbeddedTabs() { 82 final int targetSdk = mContext.getApplicationInfo().targetSdkVersion; 83 if (targetSdk >= Build.VERSION_CODES.JELLY_BEAN) { 84 return mContext.getResources().getBoolean(R.bool.action_bar_embed_tabs); 85 } 86 87 // The embedded tabs policy changed in Jellybean; give older apps the old policy 88 // so they get what they expect. 89 final Configuration configuration = mContext.getResources().getConfiguration(); 90 final int width = configuration.screenWidthDp; 91 final int height = configuration.screenHeightDp; 92 return configuration.orientation == Configuration.ORIENTATION_LANDSCAPE || 93 width >= 480 || (width >= 640 && height >= 480); 94 } 95 96 @UnsupportedAppUsage getTabContainerHeight()97 public int getTabContainerHeight() { 98 TypedArray a = mContext.obtainStyledAttributes(null, R.styleable.ActionBar, 99 com.android.internal.R.attr.actionBarStyle, 0); 100 int height = a.getLayoutDimension(R.styleable.ActionBar_height, 0); 101 Resources r = mContext.getResources(); 102 if (!hasEmbeddedTabs()) { 103 // Stacked tabs; limit the height 104 height = Math.min(height, 105 r.getDimensionPixelSize(R.dimen.action_bar_stacked_max_height)); 106 } 107 a.recycle(); 108 return height; 109 } 110 enableHomeButtonByDefault()111 public boolean enableHomeButtonByDefault() { 112 // Older apps get the home button interaction enabled by default. 113 // Newer apps need to enable it explicitly. 114 return mContext.getApplicationInfo().targetSdkVersion < 115 Build.VERSION_CODES.ICE_CREAM_SANDWICH; 116 } 117 118 @UnsupportedAppUsage getStackedTabMaxWidth()119 public int getStackedTabMaxWidth() { 120 return mContext.getResources().getDimensionPixelSize( 121 R.dimen.action_bar_stacked_tab_max_width); 122 } 123 } 124