android 之电话监听

在android中，要监听来电与去电是比较简单的，至少有如下两种方法。

1. Receiver

定义一个Receiver派生类，并指定action：android.intent.action.PHONE_STATE即可， 直接上代码。

public class PhoneStateReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
String phoneNumber = intent
.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);

if (intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)) {
Toast.makeText(context, "Receiver" + phoneNumber + " 去电",
Toast.LENGTH_SHORT).show();
} else {
TelephonyManager tm = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);

switch (tm.getCallState()) {
case TelephonyManager.CALL_STATE_RINGING:
Toast.makeText(context, "Receiver" + phoneNumber + " 来电",
Toast.LENGTH_SHORT).show();
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
Toast.makeText(context, "Receiver 正在通话",
Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
}
}

Note：去电需要在manifest文件中加上action： android.intent.action.NEW_OUTGOING_CALL

2.利用系统服务TelephonyManager。

利用TelephonyManager::listen注册一个listeners来监听电话状态，listen原型如下，

void listen
(PhoneStateListener listener, int events)

其中events可设为：PhoneStateListener.LISTEN_CALL_STATE。

完整代码如下：

public class PhoneStateMonitorActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);

tm.listen(new MyPhoneStateListener(),
PhoneStateListener.LISTEN_CALL_STATE);
}

class MyPhoneStateListener extends PhoneStateListener {

@Override
public void onCallStateChanged(int state, String incomingNumber) {
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
Toast.makeText(PhoneStateMonitorActivity.this,
incomingNumber + " 来电", Toast.LENGTH_SHORT).show();
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
Toast.makeText(PhoneStateMonitorActivity.this, "正在通话",
Toast.LENGTH_SHORT).show();
break;
default:
break;
}

super.onCallStateChanged(state, incomingNumber);
}
}
}

在模拟器测试该代码，可以通过DDMS Emulator Control模拟电话拨入。

注意：两种方法都需要加上READ_PHONE_STATE 权限。
<uses-permission android:name="android.permission.READ_PHONE_STATE" />