android logcat日志保存到文件中

最新推荐文章于 2025-05-15 12:15:15 发布

wyyother

最新推荐文章于 2025-05-15 12:15:15 发布

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本文链接：https://blog.youkuaiyun.com/wyyother/article/details/31564467

本文介绍如何在Android应用中获取权限并保存logcat日志到本地文件，便于日志分析和问题排查。

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package com.android.write;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class SaveLog extends Thread {

   private String shell = "logcat";
   private String logpath = "/mnt/sdcard2/logcat.txt";
   private BufferedReader mReader;
   private Process process = null;
   private FileOutputStream fos = null;
   private InputStream inputStream= null;
   private boolean mRunning = true;
   private BufferedWriter bw = null;
   private File file = null;

   public SaveLog() {
       file = new File(logpath);
       try {
           if (!file.exists()) {
               file.createNewFile();
           }
           fos = new FileOutputStream(file, true);
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

   }

   public void run() {
       try {

           process = Runtime.getRuntime().exec(shell);
           inputStream = process.getInputStream();
           mReader = new BufferedReader(new InputStreamReader(inputStream));
           String line = null;
           while ((line = mReader.readLine()) != null){
               file = new File(logpath);
               if (!file.exists()) {
                   file.createNewFile();
                   fos = new FileOutputStream(file, true);
               }
               if (file.length() > 1 * 1024 * 1024) {
                   FileOutputStream fos = new FileOutputStream(file);
                   fos.write("".getBytes());
                   fos.close();
                   clearLogCache();
               }
               if (line.length() == 0) {
                   continue;
               }
               if (fos != null) {
                   fos.write((line + "\n").getBytes());
               }

           }

       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

   }


      private void clearLogCache() {
          Process proc = null;
          List<String> commandList = new ArrayList<String>();
          commandList.add("logcat");
          commandList.add("-c");
          //commandList.add("*:E");// 过滤所有的错误信息
          try {
           proc = Runtime.getRuntime().exec(
                      commandList.toArray(new String[commandList.size()]));
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

      }

}

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