Android之BroadcastReceiver 廣播接受者（短信竊聽實例）

BroadcastReceiver用於接收廣播Intent，廣播Intent的發送是通過調用Context.sendBroadcast()、Context.sendOrderedBroadcast()來實現的。通常一個廣播Intent可以被訂閱了此Intent的多個廣播接收者所接收

0.要實現一個廣播接收者方法如下：

(1)第一步：繼承BroadcastReceiver，並重寫onReceive()方法。

1. public class IncomingSMSReceiver extends BroadcastReceiver
2. {
3. @Override public void onReceive(Context context, Intent intent){ }
4. }

1. public class IncomingSMSReceiver extends BroadcastReceiver
2. {
3. @Override public void onReceive(Context context, Intent intent){ }
4. }

(2)第二步：訂閱感興趣的廣播Intent，訂閱方法有兩種：

第一種：使用代碼進行訂閱

1. IntentFilter filter = new IntentFilter("Android.provider.Telephony.SMS_RECEIVED");
2. IncomingSMSReceiver receiver = new IncomingSMSReceiver();
3. registerReceiver(receiver, filter);

1. IntentFilter filter = new IntentFilter("android.provider.Telephony.SMS_RECEIVED");
2. IncomingSMSReceiver receiver = new IncomingSMSReceiver();
3. registerReceiver(receiver, filter);

第二種：在AndroidManifest.xml文件中的<application>節點裡進行訂閱:

1. <receiver android:name=".IncomingSMSReceiver">
2. <intent-filter>
3. <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
4. </intent-filter>
5. </receiver>

1. <receiver android:name=".IncomingSMSReceiver">
2. <intent-filter>
3. <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
4. </intent-filter>
5. </receiver>

1.除了短信到來廣播Intent，Android還有很多廣播Intent，如：開機啟動、電池電量變化、時間已經改變等廣播Intent。

(1)接收電池電量變化廣播Intent ，在AndroidManifest.xml文件中的<application>節點裡訂閱此Intent:

1. <receiver android:name=".IncomingSMSReceiver">
2. <intent-filter>
3. <action android:name="android.intent.action.BATTERY_CHANGED"/>
4. </intent-filter>
5. </receiver>

1. <receiver android:name=".IncomingSMSReceiver">
2. <intent-filter>
3. <action android:name="android.intent.action.BATTERY_CHANGED"/>
4. </intent-filter>
5. </receiver>

(2)接收開機啟動廣播Intent，在AndroidManifest.xml文件中的<application>節點裡訂閱此Intent:

1. <receiver android:name=".IncomingSMSReceiver">
2. <intent-filter>
3. <action android:name="android.intent.action.BOOT_COMPLETED"/>
4. </intent-filter>
5. </receiver>

1. <receiver android:name=".IncomingSMSReceiver">
2. <intent-filter>
3. <action android:name="android.intent.action.BOOT_COMPLETED"/>
4. </intent-filter>
5. </receiver>

並且要進行權限聲明：

1. <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

1. <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>