Android中级篇之简单的来电监视器

本文实现的是一个简单的来电监视器，用Toast来提示电话来电的不同状态；

看图 ：

主要代码 ：

package com.yin.telephony;
import android.app.Activity;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.widget.Toast;
public class MainActivity extends Activity {
	private static final String TAG = "com.yin.telephony";
	TelephonyManager myManager;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        myManager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
        
        myManager.listen(new myManagerListener(), PhoneStateListener.LISTEN_CALL_STATE);
    }
    
    private class myManagerListener extends PhoneStateListener{
		public void onCallStateChanged(int state, String incomingNumber) {
			switch(state){
				case TelephonyManager.CALL_STATE_IDLE :
					Toast.makeText(getApplicationContext(), "电话中断", Toast.LENGTH_LONG).show();
					Log.e(TAG,"CALL_STATE_IDLE");
					break;
					
				case TelephonyManager.CALL_STATE_OFFHOOK :
					Toast.makeText(getApplicationContext(), "电话挂起", Toast.LENGTH_LONG).show();
					Log.e(TAG,"CALL_STATE_OFFHOOK");
					break;
				case TelephonyManager.CALL_STATE_RINGING :
					Toast.makeText(getApplicationContext(), "来电号码 ："+incomingNumber, Toast.LENGTH_LONG).show();
					Log.e(TAG,"CALL_STATE_RINGING");
					break;
				default :
					break;
			}
			
			super.onCallStateChanged(state, incomingNumber);
		}
    	
    }
}

注意添加相应权限 ：

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