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 android.databinding; 18 19 import android.os.Parcel; 20 import android.os.Parcelable; 21 22 import java.io.Serializable; 23 24 /** 25 * An observable class that holds a parcelable object. 26 * <p> 27 * Observable field classes may be used instead of creating an Observable object: 28 * <pre><code>public class MyDataObject { 29 * public final ObservableParcelable<String> name = new ObservableParcelable<String>(); 30 * public final ObservableInt age = new ObservableInt(); 31 * }</code></pre> 32 * Fields of this type should be declared final because bindings only detect changes in the 33 * field's value, not of the field itself. 34 * <p> 35 * This class is parcelable but you should keep in mind that listeners are ignored when the object 36 * is parcelled. Unless you add custom observers, this should not be an issue because data binding 37 * framework always re-registers observers when the view is bound. 38 */ 39 public class ObservableParcelable<T extends Parcelable> extends ObservableField<T> 40 implements Parcelable, Serializable { 41 static final long serialVersionUID = 1L; 42 /** 43 * Wraps the given object and creates an observable object 44 * 45 * @param value The value to be wrapped as an observable. 46 */ ObservableParcelable(T value)47 public ObservableParcelable(T value) { 48 super(value); 49 } 50 51 /** 52 * Creates an empty observable object 53 */ ObservableParcelable()54 public ObservableParcelable() { 55 super(); 56 } 57 58 @Override describeContents()59 public int describeContents() { 60 return 0; 61 } 62 63 @Override writeToParcel(Parcel dest, int flags)64 public void writeToParcel(Parcel dest, int flags) { 65 dest.writeParcelable(get(), 0); 66 } 67 68 public static final Parcelable.Creator<ObservableParcelable> CREATOR 69 = new Parcelable.Creator<ObservableParcelable>() { 70 71 @Override 72 public ObservableParcelable createFromParcel(Parcel source) { 73 //noinspection unchecked 74 return new ObservableParcelable(source.readParcelable(getClass().getClassLoader())); 75 } 76 77 @Override 78 public ObservableParcelable[] newArray(int size) { 79 return new ObservableParcelable[size]; 80 } 81 }; 82 } 83