android实用方法----代码中抓取log

最近在公司中遇到一个需求，客户的手机出现bug但是我们复现不出来，所以我们主管让我写个抓log的apk。
思路很简单，开启一个服务，然后用Runtime.getRuntime().exec(String [] cmdArray);方法调用命令行执行adb命令就好。
给大家贴上代码LogObserverService

package com.kukool.game.Service;import android.app.Service;import android.content.Intent;import android.os.Bundle;import android.os.IBinder;import android.util.Log;import com.kukool.game.ddz.MainActivity;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;/** * 抓log的服务 */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 int onStartCommand(Intent intent, int flags, int startId) {        // TODO Auto-generated method stub        Log.v("TrafficService","startCommand");//START_STICKY是service被kill掉后自动重写创建        flags =  START_STICKY;        return super.onStartCommand(intent, flags, startId);    }    @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(MainActivity.LOG_ACTION);        sendBroadcast(mIntent);    }    @Override    public void run() {        Process pro = null;        BufferedReader bufferedReader = null;        try {            String[] running=new String[]{ "logcat","|find","cocos2d-x debug" };//          pro = Runtime.getRuntime().exec("logcat");            pro = Runtime.getRuntime().exec(running);//          Runtime.getRuntime().exec("logcat -c").waitFor();            bufferedReader = new BufferedReader(new InputStreamReader(                    pro.getInputStream()));        } catch (IOException e) {            e.printStackTrace();        }        //筛选需要的字串        String strFilter="cocos2d-x debug";        String line = null;            try {                Log.e("走到这里没","走到这里没");                System.out.println(bufferedReader.readLine());                while ((line =bufferedReader.readLine()) != null) {                    Log.e("走到这里没","走到这里没");                    if (line.indexOf(strFilter) >=0) {                        //读出每行log信息                        System.out.println(line);                        logContent.delete(0,logContent.length());                        logContent.append(line);                        logContent.append("\n");                        //发送log内容                        sendLogContent(logContent.toString());                        Thread.yield();                    }                }            } catch (Exception e) {                e.printStackTrace();            }    }}

别忘了在清单文件中加上

       <service android:name=".LogObserverService" />

还有权限

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

然后是测试代码，具体你们可以改动

package com.example.admin.logobserver;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.TextView;import java.io.File;import java.io.FileOutputStream;public class MainActivity extends AppCompatActivity {    private String TAG = "LogObserverActivity";    public static String LOG_ACTION = "com.example.admin.logobserver.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.activity_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 View.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();                Log.e("log接收","log&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&");                logContent.setText(mBundle.getString("log"));                writeToSdCard(mBundle.getString("log"));            }        }    }    //写数据    public void writeToSdCard(String string){        //1、判断sd卡是否可用        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){            //sd卡可用            //2、获取sd卡路径            File sdFile=Environment.getExternalStorageDirectory();            File path=new File(sdFile,"360/a.txt");//sd卡下面的a.txt文件  参数 前面 是目录 后面是文件            try {                FileOutputStream fileOutputStream=new FileOutputStream(path,true);                fileOutputStream.write(string.getBytes());            } catch (Exception e) {                e.printStackTrace();            }        }    }    @Override    protected void onDestroy() {        super.onDestroy();        if (logObserverIntent!=null){            stopService(logObserverIntent);        }        if (mLogBroadcastReceiver!=null){            unregisterReceiver(mLogBroadcastReceiver);        }    }}

这就可以了，但是这个只能嵌套在你项目中不能做成APK因为只能获取自己项目的log，原因是 android.permission.READ_LOGS:app读取日志权限，android 4.1之前版本通过申请READ_LOGS权限就可以读取其他应用的log了。但是谷歌发现这样存在安全风险，于是android 4.1以及之后版本，即使申请了READ_LOGS权限也无法读取其他应用的日志信息了。4.1版本中 Logcat的签名变为 “signature|system|development”了，这意味着只有系统签名的app或者root权限的app才能使用该权限。普通用户可以通过ADB查看所有日志。

简单说就是谷歌觉得危险干掉了，你又不可能叫客户刷机，所以就是嵌套在你的项目中。

对了过滤我用的 adb logcat |find “保留的log”
还可以用 adb logcat -s 你想看的类的log