通常來說Android手機沒有未接來電的監聽器，如果要實現對未接來電的處理，則需要自己編寫程序來實現。本文所述程序實例即為Android實現判斷手機未接來電及處理方法。主要分為四個步驟來進行：
1、編寫CallListener,處理手機狀態變更監聽,當狀態改變時進行處理：
package rbase.app.smshelpmate.call.listener;import java.text.MessageFormat;import rbase.app.smshelpmate.Config;import rbase.app.smshelpmate.R;import rbase.app.smshelpmate.call.enums.CallStateEnum;import rbase.app.smshelpmate.forward.ForwardManager;import rbase.app.smshelpmate.forward.enums.ForwardType;import rbase.app.smshelpmate.forward.vo.ForwardParam;import android.content.Context;import android.telephony.PhoneStateListener;import android.telephony.TelephonyManager;import android.util.Log;public class CallListener extends PhoneStateListener {private static final String TAG = "sms";private static int lastetState = TelephonyManager.CALL_STATE_IDLE; //最后的狀態private Context context;public CallListener(Context context) {super();this.context = context;}public void onCallStateChanged(int state, String incomingNumber) {Log.v(TAG, "CallListener call state changed : " + incomingNumber);String m = null;// 如果當前狀態為空閑,上次狀態為響鈴中的話,則認為是未接來電if(lastetState == TelephonyManager.CALL_STATE_RINGING&& state == TelephonyManager.CALL_STATE_IDLE){sendSmgWhenMissedCall(incomingNumber);}//最后改變當前值lastetState = state;}private void sendSmgWhenMissedCall(String incomingNumber) {//未接來電處理(發短信,發email等)}}2、編寫CallReceiver，注冊來電廣播接收器：
package rbase.app.smshelpmate.call.service;import rbase.app.smshelpmate.Const;import rbase.app.smshelpmate.call.listener.CallListener;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.telephony.PhoneStateListener;import android.telephony.TelephonyManager;import android.util.Log;public class CallReceiver extends BroadcastReceiver{public void onReceive(Context context, Intent intent) {Log.i("sms", "CallReceiver Start...");TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);CallListener customPhoneListener = new CallListener(context);telephony.listen(customPhoneListener,PhoneStateListener.LISTEN_CALL_STATE);Bundle bundle = intent.getExtras();String phoneNr = bundle.getString("incoming_number");Log.i("sms", "CallReceiver Phone Number : " + phoneNr);}}3、在AndroidManifest.xml中的application節點下注冊電話狀態改變的廣播接收：
<manifest ...><application ...><receiver android:name=".call.service.CallReceiver"><intent-filter android:priority="100"><action android:name="android.intent.action.PHONE_STATE" /></intent-filter></receiver></application></manifest>
4、在AndroidManifest.xml中添加讀取手機狀態的權限：
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
通過以上的步驟,當手機有未接來電時 sendSmgWhenMissedCall 該方法就會觸發,就可以進行相應的處理。
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