LogCatHelper

Posted 2022-11-22 z_fishLong

import android.content.Context;
import android.os.Environment;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;


/**
 * 日志的记录 -->这玩意一般在调试的时候用到
 * 上线时候应该去掉否则太消耗性能了
 */
public class LogcatHelper 

    private static LogcatHelper INSTANCE = null;
    private static String PATH_LOGCAT;
    private int mPId;
    private LogDumper mLogDumper;

    private LogcatHelper(Context context)  //私有构造函数
        init(context);                      //初始化目录
        mPId = android.os.Process.myPid();
    

    public static LogcatHelper getInstance(Context context) 
        if (INSTANCE == null) 
            INSTANCE = new LogcatHelper(context);
        
        return INSTANCE;
    


    /**
     * 初始化目录
     */
    public void init(Context context) 
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) // 优先保存到SD卡中
            PATH_LOGCAT = 
                    Environment.getExternalStorageDirectory().getAbsolutePath() + 
                            "/SoundAi/logcat/CarSolution/";
         else                         // 如果SD卡不存在，就保存到本应用的目录下
            PATH_LOGCAT = 
                    context.getFilesDir().getAbsolutePath() + File.separator + 
                            "SoundAi/logcat/CarSolution/";
        

        File file = new File(PATH_LOGCAT);
        if (!file.exists()) 
            file.mkdirs();
        
    


    //开始
    public synchronized void start() 
        stop();
        mLogDumper = new LogDumper(String.valueOf(mPId), PATH_LOGCAT);
        mLogDumper.start();
    

    //停止
    public synchronized void stop() 
        if (mLogDumper != null) 
            mLogDumper.stopLogs();
            mLogDumper = null;
        
    

    //是否在运行
    public boolean isRunning() 
        if (mLogDumper != null) 
            return mLogDumper.getThreadState();
         else 
            return false;
        
    

    //log
    private class LogDumper extends Thread 
        private Process logcatProc;
        private BufferedReader mReader = null;
        private boolean mRunning = true;
        String cmds = null;
        private String mPID;
        private FileOutputStream out = null;


        public LogDumper(String pid, String dir) 
            try 
                mPID = pid;
                File file = new File(dir + "/" + FileHelper.generateFileName(".log"));
                if (!file.exists()) 
                    file.createNewFile();
                
                out = new FileOutputStream(file);
             catch (FileNotFoundException e) 
                e.printStackTrace();
             catch (IOException e) 
                e.printStackTrace();
            

            cmds = "logcat -v time | grep " + mPID;
        

        public void stopLogs() 
            mRunning = false;
        

        public boolean getThreadState() 
            return mRunning;
        

        @Override
        public void run() 
            try 
                logcatProc = Runtime.getRuntime().exec(cmds);
                mReader =
                        new BufferedReader(new InputStreamReader(logcatProc.getInputStream()), 1024);
                String line = null;
                while (mRunning && (line = mReader.readLine()) != null) 
                    if (!mRunning) 
                        break;
                    
                    if (line.length() == 0) 
                        continue;
                    
                    if (out != null && line.contains(mPID)) 
                        out.write((line + "\\n").getBytes());
                    
                
             catch (IOException e) 
                e.printStackTrace();
             finally 
                if (logcatProc != null) 
                    logcatProc.destroy();
                    logcatProc = null;
                
                if (mReader != null) 
                    try 
                        mReader.close();
                        mReader = null;
                     catch (IOException e) 
                        e.printStackTrace();
                    
                
                if (out != null) 
                    try 
                        out.close();
                     catch (IOException e) 
                        e.printStackTrace();
                    
                    out = null;