电话通话几种状态的监听

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;

	@Override
	protected 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 {

		@Override
		public 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;
			}
		}

	}

}