1 /** 2 * Copyright (c) 2013, Google Inc. 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.mail.utils; 18 19 import android.annotation.SuppressLint; 20 import android.app.Activity; 21 import android.content.Context; 22 import android.support.annotation.ColorRes; 23 import android.support.v4.view.ViewCompat; 24 import android.view.View; 25 import android.view.ViewParent; 26 import android.view.Window; 27 import android.view.accessibility.AccessibilityEvent; 28 import android.view.accessibility.AccessibilityManager; 29 30 /** 31 * Utility class to perform some common operations on views. 32 */ 33 public class ViewUtils { 34 35 /** 36 * Determines whether the given view has RTL layout. NOTE: do not call this 37 * on a view until it has been measured. This value is not guaranteed to be 38 * accurate until then. 39 */ 40 public static boolean isViewRtl(View view) { 41 return ViewCompat.getLayoutDirection(view) == ViewCompat.LAYOUT_DIRECTION_RTL; 42 } 43 44 /** 45 * @return the start padding of the view. Prior to API 17, will return the left padding. 46 */ 47 @SuppressLint("NewApi") 48 public static int getPaddingStart(View view) { 49 return Utils.isRunningJBMR1OrLater() ? view.getPaddingStart() : view.getPaddingLeft(); 50 } 51 52 /** 53 * @return the end padding of the view. Prior to API 17, will return the right padding. 54 */ 55 @SuppressLint("NewApi") 56 public static int getPaddingEnd(View view) { 57 return Utils.isRunningJBMR1OrLater() ? view.getPaddingEnd() : view.getPaddingRight(); 58 } 59 60 /** 61 * Sets the text alignment of the view. Prior to API 17, will no-op. 62 */ 63 @SuppressLint("NewApi") 64 public static void setTextAlignment(View view, int textAlignment) { 65 if (Utils.isRunningJBMR1OrLater()) { 66 view.setTextAlignment(textAlignment); 67 } 68 } 69 70 /** 71 * Convenience method for sending a {@link android.view.accessibility.AccessibilityEvent#TYPE_ANNOUNCEMENT} 72 * {@link android.view.accessibility.AccessibilityEvent} to make an announcement which is related to some 73 * sort of a context change for which none of the events representing UI transitions 74 * is a good fit. For example, announcing a new page in a book. If accessibility 75 * is not enabled this method does nothing. 76 * 77 * @param view view to perform the accessibility announcement 78 * @param text The announcement text. 79 */ 80 public static void announceForAccessibility(View view, CharSequence text) { 81 final AccessibilityManager accessibilityManager = (AccessibilityManager) 82 view.getContext().getSystemService(Context.ACCESSIBILITY_SERVICE); 83 final ViewParent parent = view.getParent(); 84 if (accessibilityManager.isEnabled() && parent != null) { 85 AccessibilityEvent event = AccessibilityEvent.obtain( 86 AccessibilityEvent.TYPE_ANNOUNCEMENT); 87 view.onInitializeAccessibilityEvent(event); 88 event.getText().add(text); 89 event.setContentDescription(null); 90 parent.requestSendAccessibilityEvent(view, event); 91 } 92 } 93 94 /** 95 * Sets the status bar color of the provided activity. 96 */ 97 @SuppressLint("NewApi") 98 public static void setStatusBarColor(Activity activity, @ColorRes int colorId) { 99 if (Utils.isRunningLOrLater() && activity != null) { 100 final Window window = activity.getWindow(); 101 if (window != null) { 102 window.setStatusBarColor(activity.getResources().getColor(colorId)); 103 } 104 } 105 } 106 } 107
