监听Android系统Log

转载请注明出处，原文网址：http://blog.csdn.net/m_changgong/article/details/7661940作者：张燕广

实现原理：1）执行logcat命令；

2）在service中把监听到的log内容通过广播发送出去；

3）Client端接收广播，获取log内容；

4）注意，添加读取log的权限

为什么要监听Log？

通过分析log可以监听系统安装、卸载软件等操作。

具体实现，见代码：

监听log的服务LogObserverService，代码如下：

 package com.isoft.log;

 import java.io.DataInputStream;
 import java.io.IOException;

 import android.app.Service;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.util.Log;

 public class LogObserverService extends Service implements Runnable{
     private String TAG = "LogObserverService";
     private boolean isObserverLog = false;
     private StringBuffer logContent = null;
     private Bundle mBundle = null;
     private Intent mIntent = null;
     @Override
     public IBinder onBind(Intent intent) {
         return null;
     }

     @Override
     public void onCreate() {
         super.onCreate();
         Log.i(TAG,"onCreate");
         mIntent = new Intent();
         mBundle = new Bundle();
         logContent = new StringBuffer();
         startLogObserver();
     }

     /**
      * 开启检测日志
      */
     public void startLogObserver() {
         Log.i(TAG,"startObserverLog");
         isObserverLog = true;
         Thread mTherad = new Thread(this);
         mTherad.start();
     }

     /**
      * 关闭检测日志
      */
     public void stopLogObserver() {
         isObserverLog = false;
     }

     @Override
     public void onDestroy() {
         super.onDestroy();
         stopLogObserver();
     }

     /**
      * 发送log内容
      * @param logContent
      */
     private void sendLogContent(String logContent){
         mBundle.putString("log",logContent);
         mIntent.putExtras(mBundle);
         mIntent.setAction(LogObserverActivity.LOG_ACTION);
         sendBroadcast(mIntent);
     }


     @Override
     public void run() {
         Process pro = null;
         try {
             Runtime.getRuntime().exec("logcat -c").waitFor();

             pro = Runtime.getRuntime().exec("logcat");
         } catch (InterruptedException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

         DataInputStream dis = new DataInputStream(pro.getInputStream());
         String line = null;
         while (isObserverLog) {
             try {
                 while ((line = dis.readLine()) != null) {
                     String temp = logContent.toString();
                     logContent.delete(0, logContent.length());
                     logContent.append(line);
                     logContent.append("\n");
                     logContent.append(temp);
                     //发送log内容
                     sendLogContent(logContent.toString());
                     Thread.yield();
                 }
             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
     }
 }

使用log监听服务的Client端LogObserverActivity，代码如下：

 package com.isoft.log;

 import android.app.Activity;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.TextView;

 public class LogObserverActivity extends Activity {
     private String TAG = "LogObserverActivity";
     public static String LOG_ACTION = "com.isoft.log.LOG_ACTION";
     private TextView logContent = null;
     private Button start = null;
     private Intent logObserverIntent = null;
     private LogBroadcastReceiver mLogBroadcastReceiver = null;
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         //初始化视图
         initView();
         //注册log广播接收者
         registerLogBroadcastReceiver();
     }

     private void initView() {
         logContent = (TextView) findViewById(R.id.logContent);
         logContent.setText("show log");
         start = (Button)findViewById(R.id.start);
         start.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
                 startLogObserverService();
                 start.setEnabled(false);
             }
         });
     }

     private void startLogObserverService() {
         logObserverIntent = new Intent(this, LogObserverService.class);
         startService(logObserverIntent);
     }

     /**
      * 注册log广播接收者
      */
     private void registerLogBroadcastReceiver(){
         mLogBroadcastReceiver = new LogBroadcastReceiver();
         IntentFilter filter = new IntentFilter();
         filter.addAction(LOG_ACTION);
         registerReceiver(mLogBroadcastReceiver, filter);
     }

     /**
      * log 广播接收者
      * @author zhangyg
      *
      */
     private class LogBroadcastReceiver extends BroadcastReceiver{
         private String action = null;
         private Bundle mBundle = null;
         @Override
         public void onReceive(Context context, Intent intent) {
             action = intent.getAction();
             if(LOG_ACTION.equals(action)){
                 mBundle = intent.getExtras();
                 logContent.setText(mBundle.getString("log"));
             }
         }
     }

     @Override
     protected void onDestroy() {
         super.onDestroy();
         stopService(logObserverIntent);
         unregisterReceiver(mLogBroadcastReceiver);
     }
 }

运行效果截图如下：

点击下载源代码