監聽Android系統Log

轉載請註明出處，原文網址：http://blog.csdn.net/m_changgong/article/details/7661940作者：張燕廣

實現原理：1）執行logcat命令；

2）在service中把監聽到的log內容通過廣播發送出去；

3）Client端接收廣播，獲取log內容；

4）注意，添加讀取log的權限<uses-permission android:name="android.permission.READ_LOGS"/>

爲什麼要監聽Log？

通過分析log可以監聽系統安裝、卸載軟件等操作。

具體實現，見代碼：

監聽log的服務LogObserverService，代碼如下：

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();
    }

    /**
     * 開啓檢測日誌
     */
    public void startLogObserver() {
        Log.i(TAG,"startObserverLog");
        isObserverLog = true;
        Thread mTherad = new Thread(this);
        mTherad.start();
    }

    /**
     * 關閉檢測日誌
     */
    public void stopLogObserver() {
        isObserverLog = false;
    }

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

    /**
     * 發送log內容
     * @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);
                    //發送log內容
                    sendLogContent(logContent.toString());
                    Thread.yield();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

使用log監聽服務的Client端LogObserverActivity，代碼如下：

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);
        //初始化視圖
        initView();
        //註冊log廣播接收者
        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);
    }

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

    /**
     * log 廣播接收者
     * @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);
    }
}

運行效果截圖如下：

點擊下載源代碼