电话通话几种状态的监听

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package com.test.telephone;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.telephony.PhoneStateListener;import android.telephony.TelephonyManager;import android.util.Log;import android.widget.TextView;public class ActivityMain extends Activity {private static final String TAG = "Telephony";TextView view = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 获取电话管理的一个类实例TelephonyManager mTelephonyMgr = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);// Registers a listener object to receive notification of changes in// specified telephony states// 建立一个监听器来实时监听电话的通话状态mTelephonyMgr.listen(new TeleListener(),PhoneStateListener.LISTEN_CALL_STATE);view = new TextView(this);view.setText("listen the state of phone/n");setContentView(view);}class TeleListener extends PhoneStateListener {@Overridepublic void onCallStateChanged(int state, String incomingNumber) {super.onCallStateChanged(state, incomingNumber);switch (state) {// 当处于待机状态中case TelephonyManager.CALL_STATE_IDLE: {Log.e(TAG, "CALL_STATE_IDLE");view.append("CALL_STATE_IDLE " + "/n");break;}// 当处于通话中case TelephonyManager.CALL_STATE_OFFHOOK: {Log.e(TAG, "CALL_STATE_OFFHOOK");view.append("CALL_STATE_OFFHOOK" + "/n");break;}// 当处于拨号状态中..case TelephonyManager.CALL_STATE_RINGING: {Log.e(TAG, "CALL_STATE_RINGING");view.append("CALL_STATE_RINGING" + "/n");break;}default:break;}}}}