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      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&lt;String&gt; name = new ObservableField&lt;String&gt;();
     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      */
     47     public ObservableInt(int value) {
     48         mValue = value;
     49     }
     50 
     51     /**
     52      * Creates an ObservableInt with the initial value of <code>0</code>.
     53      */
     54     public ObservableInt() {
     55     }
     56 
     57     /**
     58      * @return the stored value.
     59      */
     60     public int get() {
     61         return mValue;
     62     }
     63 
     64     /**
     65      * Set the stored value.
     66      */
     67     public void set(int value) {
     68         if (value != mValue) {
     69             mValue = value;
     70             notifyChange();
     71         }
     72     }
     73 
     74     @Override
     75     public int describeContents() {
     76         return 0;
     77     }
     78 
     79     @Override
     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