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 package android.databinding; 17 18 import android.os.Parcel; 19 import android.os.Parcelable; 20 21 import java.io.Serializable; 22 23 /** 24 * An observable class that holds a primitive int. 25 * <p> 26 * Observable field classes may be used instead of creating an Observable object: 27 * <pre><code>public class MyDataObject { 28 * public final ObservableField<String> name = new ObservableField<String>(); 29 * public final ObservableInt age = new ObservableInt(); 30 * }</code></pre> 31 * Fields of this type should be declared final because bindings only detect changes in the 32 * field's value, not of the field itself. 33 * <p> 34 * This class is parcelable and serializable but callbacks are ignored when the object is 35 * parcelled / serialized. Unless you add custom callbacks, this will not be an issue because 36 * data binding framework always re-registers callbacks when the view is bound. 37 */ 38 public class ObservableInt extends BaseObservable implements Parcelable, Serializable { 39 static final long serialVersionUID = 1L; 40 private int mValue; 41 42 /** 43 * Creates an ObservableInt with the given initial value. 44 * 45 * @param value the initial value for the ObservableInt 46 */ ObservableInt(int value)47 public ObservableInt(int value) { 48 mValue = value; 49 } 50 51 /** 52 * Creates an ObservableInt with the initial value of <code>0</code>. 53 */ ObservableInt()54 public ObservableInt() { 55 } 56 57 /** 58 * @return the stored value. 59 */ get()60 public int get() { 61 return mValue; 62 } 63 64 /** 65 * Set the stored value. 66 */ set(int value)67 public void set(int value) { 68 if (value != mValue) { 69 mValue = value; 70 notifyChange(); 71 } 72 } 73 74 @Override describeContents()75 public int describeContents() { 76 return 0; 77 } 78 79 @Override writeToParcel(Parcel dest, int flags)80 public void writeToParcel(Parcel dest, int flags) { 81 dest.writeInt(mValue); 82 } 83 84 public static final Parcelable.Creator<ObservableInt> CREATOR 85 = new Parcelable.Creator<ObservableInt>() { 86 87 @Override 88 public ObservableInt createFromParcel(Parcel source) { 89 return new ObservableInt(source.readInt()); 90 } 91 92 @Override 93 public ObservableInt[] newArray(int size) { 94 return new ObservableInt[size]; 95 } 96 }; 97 } 98