廣播接受者創(chuàng)建

1創(chuàng)建廣播接收者（買了一臺收音機）
2 注冊廣播接收者
3 添加過濾器(添加頻道）
4 添加權(quán)限

1創(chuàng)建廣播接收者 2注冊廣播接收者

new -other -broadcastreceiver
添加廣播接收者名稱例如MyTelephoneReceiver
完成后會產(chǎn)生一個MyTelephoneReceiver的類，并且在AndroidMainifest文件中注冊。
MyTelephoneReceiver類

public class MyTelephoneReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    // TODO: This method is called when the BroadcastReceiver is receiving
    //當(dāng)接收了廣播之后會調(diào)用該方法
}
}

AndroidMainifest.xml文件

  <receiver
        android:name=".MyTelephoneReceiver"
        android:enabled="true"
        android:exported="true">
      </intent-filter>
    </receiver>

3 添加過濾器 4 添加權(quán)限

想要接受外撥電話的系統(tǒng)廣播就要添加外撥電話的過濾器
在AndroidMainifest.xml文件中添加過濾器，并添加權(quán)限

<receiver
        android:name=".MyTelephoneReceiver"
        android:enabled="true"
        android:exported="true">
      <intent-filter>
          <action android:name="android.intent.action.NEW_OUTGOING_CALL"/>
      </intent-filter>
    </receiver>


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

5 接收到廣播后，判斷號碼并攔截

在MyTelephoneReceiver類中添加代碼

public class MyTelephoneReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    // TODO: This method is called when the BroadcastReceiver is receiving
    //當(dāng)接收了廣播之后會調(diào)用該方法
    String number=getResultData();//獲取號碼
    Log.i("mybroadcastreceiver","我監(jiān)聽到了有人向外撥打電話"+number);
    if(number.equals("13312345678")){
        setResultData(null);
    }
}
}