Android 电话监听

public class PhoneStealService extends Service {

	/**
	 * 声明电话状态监听器对象并实例化
	 */
	private PhoneStateListener phoneStateListener=new PhoneStateListener(){
		/**
		 * 声明存放来电号码的变量
		 */
		private String incomingNumber;
		
		/**
		 * 声明媒体录制器对象
		 */
		private MediaRecorder mediaRecorder;
		
		/**
		 * 是否真正录音
		 */
		private boolean isRecording;
		
		/**
		 * 声明录制音频的文件对象
		 */
		private File destFile;
		
		/**
		 * 当设备(电话)状态发生变化时自动调用的方法
		 * @param state 电话状态
		 * @param incomingNumber 来电号码
		 */
		public void onCallStateChanged(int state, String incomingNumber) {
			switch (state) {
				/*
				 * 电话处于空闲状态。
				 * 空闲状态分两种情况：
				 * 	A:一致处于空闲状态
				 *  B:用户刚接完电话挂断后回归到空闲状态
				 */
				case TelephonyManager.CALL_STATE_IDLE:
					if(mediaRecorder!=null && isRecording){
						mediaRecorder.stop();
						mediaRecorder.release();
						mediaRecorder=null;
						isRecording=false;
					}
					System.out.println("===电话处于空闲状态==PhoneStateListener.onCallStateChanged(int state="+state+", String incomingNumber="+incomingNumber+")=====");
					break;
					
				//来电状态，此时才有电话号码
				case TelephonyManager.CALL_STATE_RINGING:
					this.incomingNumber=incomingNumber;
					System.out.println("===电话处于来电状态==PhoneStateListener.onCallStateChanged(int state="+state+", String incomingNumber="+incomingNumber+")=====");
					break;
					
				//接听状态
				case TelephonyManager.CALL_STATE_OFFHOOK:
					//1.实例化媒体录制器对象
					mediaRecorder=new MediaRecorder();
					//2.设置音频来源为麦克风
					mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
					//3.设置音频的输出格式为3gp格式
					mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
					//4.设置音频编码
					mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
					
					if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
						String fileName=this.incomingNumber+"_"+System.currentTimeMillis()+".3gp";
						destFile=new File(Environment.getExternalStorageDirectory(),fileName);
						//5.设置录音文件的输出路径
						mediaRecorder.setOutputFile(destFile.getAbsolutePath());
					}
					
				try {
					//6.媒体录制器处于就绪状态
					mediaRecorder.prepare();
					//7.开始录音
					mediaRecorder.start();
				} catch (IllegalStateException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}  
					System.out.println("===电话处于接听状态==PhoneStateListener.onCallStateChanged(int state="+state+", String incomingNumber="+incomingNumber+")=====");
					break;
			}
		}
	};
	
	/**
	 * 声明电话管理器对象
	 */
	private TelephonyManager telephonyManager;
	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		super.onCreate();
		
		//通过系统服务得到电话管理器对象
		telephonyManager=(TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
		telephonyManager.listen(phoneStateListener,
				PhoneStateListener.LISTEN_CALL_STATE//指定监听电话状态
				);
		
		System.out.println("====PhoneStealService.onCreate()======");
	}
	
	
	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}
	
	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
		if(telephonyManager!=null){
			//指定不再监听电话状态
			telephonyManager.listen(phoneStateListener, PhoneStateListener.LISTEN_NONE);
		}
		
	}

}

　需要注册权限

 <!-- 注册读取电话状态的权限 -->
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <!-- 注册录制音频的权限 -->
    <uses-permission android:name="android.permission.RECORD_AUDIO" />

	<!--     	注册开机自启动广播的权限 -->
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    
<!--     	注册在手机的SDCard创建和删除文件的权限 -->
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

<!--     注册向手机SDCard文件中写入内容的权限 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />