一、添加监听电话状态所需权限

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

二、接受电话状态的广播

public class PhoneStateReceiver extends BroadcastReceiver {  private static final String TAG = "PhoneStateReceiver";  public void onReceive(Context context, Intent intent) {  Log.i(TAG, "onReceive()");  String action = intent.getAction();  if (action.equals(Intent.ACTION_NEW_OUTGOING_CALL)) {// 去电  String outNumber = this.getResultData();// 去电号码  } else if ("android.intent.action.PHONE_STATE".equals(action)) {// 来电  String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);  String inNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);// 来电号码  if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_RINGING)) {// 电话正在响铃  } else if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_IDLE)) {// 挂断  } else if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_OFFHOOK)) {// 摘机，通话状态  }  }  }  
}  

三、在AndroidManifest.xml，配置写好的Receiver：

<receiver android:name=".PhoneReceiver" >  <intent-filter>  <action android:name="android.intent.action.NEW_OUTGOING_CALL" />  <action android:name="android.intent.action.PHONE_STATE" />  </intent-filter>  
</receiver>