1 /* 2 * Copyright (C) 2011 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.email.activity; 18 19 import android.app.Activity; 20 import android.content.Context; 21 import android.content.res.Resources; 22 import android.view.View; 23 24 import com.android.email.R; 25 26 public class UiUtilities { 27 private UiUtilities() { 28 } 29 30 /** 31 * Same as {@link View#findViewById}, but crashes if there's no view. 32 */ 33 @SuppressWarnings("unchecked") 34 public static <T extends View> T getView(View parent, int viewId) { 35 return (T) checkView(parent.findViewById(viewId)); 36 } 37 38 private static View checkView(View v) { 39 if (v == null) { 40 throw new IllegalArgumentException("View doesn't exist"); 41 } 42 return v; 43 } 44 45 /** 46 * Same as {@link View#setVisibility(int)}, but doesn't crash even if {@code view} is null. 47 */ 48 public static void setVisibilitySafe(View v, int visibility) { 49 if (v != null) { 50 v.setVisibility(visibility); 51 } 52 } 53 54 /** 55 * Same as {@link View#setVisibility(int)}, but doesn't crash even if {@code view} is null. 56 */ 57 public static void setVisibilitySafe(View parent, int viewId, int visibility) { 58 setVisibilitySafe(parent.findViewById(viewId), visibility); 59 } 60 } 61
