11. 监听来电(TelephonyManager)

1. 由于最容易忘记，所以先加上权限。

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

2. 监听来电要用到TelephonyManager类，这个类通过PhoneStateListener来监听电话状态的变化。下面是PhoneStateListener类的实现

private final class PhoneStateListenerImpl extends PhoneStateListener {

@Override

public void onCallStateChanged(int state, String incomingNumber) {

switch (state) {

case TelephonyManager.CALL_STATE_IDLE://挂断电话

lblPhoneShow.setText("通话已结束");

System.out.println("通话已结束");

break;

case TelephonyManager.CALL_STATE_RINGING://电话响起

lblPhoneShow.setText(incomingNumber+"来电");

System.out.println(incomingNumber+"来电");

break;

case TelephonyManager.CALL_STATE_OFFHOOK://电话接听

lblPhoneShow.setText("接听电话...");

System.out.println("接听电话...");

break;

}

}

}

3. 创建TelephonyManager类的实例

TelephonyManager phone = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);

4. 调用TelephonyManager的listen方法开始监听。

phone.listen(new PhoneStateListenerImpl(),PhoneStateListener.LISTEN_CALL_STATE);