NoSaveStateFrameLayout.java revision cba2e2c881e8e16ea5025b564c94320174d65f01
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 17package android.support.v4.app; 18 19import android.content.Context; 20import android.os.Parcelable; 21import android.util.SparseArray; 22import android.view.View; 23import android.view.ViewGroup; 24import android.widget.FrameLayout; 25 26/** 27 * Pre-Honeycomb versions of the platform don't have View.setSaveFromParentEnabled(), 28 * so instead we insert this between the view and its parent. 29 */ 30public class NoSaveStateFrameLayout extends FrameLayout { 31 static ViewGroup wrap(View child) { 32 NoSaveStateFrameLayout wrapper = new NoSaveStateFrameLayout(child.getContext()); 33 ViewGroup.LayoutParams childParams = child.getLayoutParams(); 34 if (childParams != null) { 35 wrapper.setLayoutParams(childParams); 36 } 37 NoSaveStateFrameLayout.LayoutParams lp = new NoSaveStateFrameLayout.LayoutParams( 38 ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT); 39 child.setLayoutParams(lp); 40 wrapper.addView(child); 41 return wrapper; 42 } 43 44 public NoSaveStateFrameLayout(Context context) { 45 super(context); 46 } 47 48 /** 49 * Override to prevent freezing of any child views. 50 */ 51 @Override 52 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 53 dispatchFreezeSelfOnly(container); 54 } 55 56 /** 57 * Override to prevent thawing of any child views. 58 */ 59 @Override 60 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 61 dispatchThawSelfOnly(container); 62 } 63} 64