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android app记录运行日志 捕获奔溃异常 ,存储日志到文件

程序员文章站 2022-05-12 14:20:17
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感恩原创:http://blog.csdn.net/u014763302/article/details/47422023

app在运行过程中,为了后期的维护升级,记录日志是一个非常好的方法。

为了读取到app运行时的日志,一般的作法是单独开一个线程,在app运行的启动线程,然后app退出时停掉线程。

然而我们更好的方法是开启一个service,然后在里面做日志记录,代码如下:

package com.hai.logcat;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;

import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.app.Service;
import android.content.Intent;
import android.os.Environment;
import android.os.IBinder;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

public class MyLogcat extends Service {
    Thread thread;
    boolean readlog = true;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d("hhp", "onCreate");
        thread = new Thread(new Runnable() {
            @Override
            public void run() {
                log2();//个人觉得这个方法更实用
            }
        });
    }

    @Override
    public void onStart(Intent intent, int startId) {
        thread.start();
        Log.d("hhp", "onStart");
        super.onStart(intent, startId);
    }

    /**
     * 方法1
     */
    private void log2() {
        Log.d("hhp", "log2 start");
        String[] cmds = { "logcat", "-c" };
        String shellCmd = "logcat -v time -s *:W "; // adb logcat -v time *:W
        Process process = null;
        Runtime runtime = Runtime.getRuntime();
        BufferedReader reader = null;
        try {
            runtime.exec(cmds).waitFor();
            process = runtime.exec(shellCmd);
            reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                if (line.contains(String.valueOf(android.os.Process.myPid()))) {
                    // line = new String(line.getBytes("iso-8859-1"), "utf-8");
                    writeTofile(line);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        Log.d("hhp", "log2 finished");
    }

    /**
     * 方法2
     */
    private void log() {
        Log.d("hhp", "log start");
        String[] cmds = { "logcat", "-c" };
        String shellCmd = "logcat -v time -s *:W ";// //adb logcat -v time *:W
        Process process = null;
        InputStream is = null;
        DataInputStream dis = null;
        String line = "";
        Runtime runtime = Runtime.getRuntime();
        try {
            runtime.exec(cmds);
            process = runtime.exec(shellCmd);
            is = process.getInputStream();
            dis = new DataInputStream(is);
            // String filter = GetPid();
            String filter = android.os.Process.myPid() + "";
            while ((line = dis.readLine()) != null) { //这里如果输入流没断,会一直循环下去。
                line = new String(line.getBytes("iso-8859-1"), "utf-8");
                if (line.contains(filter)) {
                    int pos = line.indexOf(":");
                    Log.d("hhp2", line + "");
                    writeTofile(line);
                }
            }
        } catch (Exception e) {
        }
        Log.d("hhp", "log finished");
    }

    private void writeTofile(String line) {
        String content = line + "\r\n";
        File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath()
                + "/logcat/myLog.txt");
        if (!file.exists()) {
            try {
                file.createNewFile();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        FileOutputStream fos;
        try {
            fos = new FileOutputStream(file, true);
            fos.write(content.getBytes());
            fos.flush();
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

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

代码比较简单,所以没怎么注视了。说下大概思路:在service开启的时候,就开启线程不停地从logcat中读取输入流,

把读到的信息存入文件中,service停止的时候线程stop,就这么简单。

当然要读入系统日志还需要添加权限:


android app记录运行日志 捕获奔溃异常 ,存储日志到文件

上面的代码基本可以记录本app运行中的日志,但如果中途有未捕获的异常导致app奔溃,那么这个未捕获的异常导致的奔溃上面代码就记录不到了。

因为这个异常导致app奔溃,虚拟机挂掉,那当然记录日志的线程也停了。那怎么捕获这类我们未捕获的异常(运行时异常)呢,幸好android这样

一个接口UncaughtExceptionHandler,当app奔溃前,它会先通知这个接口,这样我们就可以在app奔溃前做点自己想做的事了。

关于怎么捕获奔溃异常,我觉得这位哥们的一片博客写的不错http://blog.csdn.net/liuhe688/article/details/6584143#, 我借鉴着改了下:

package com.hai.logcat;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

public class CrashHandler implements UncaughtExceptionHandler {

    public static final String TAG = "CrashHandler";

    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    // CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    // 程序的Context对象
    private Context mContext;
    // 用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();

    // 用于格式化日期,作为日志文件名的一部分
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss  ");

    /** 保证只有一个CrashHandler实例 */
    private CrashHandler() {
    }

    /** 获取CrashHandler实例 ,单例模式 */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     * 
     * @param context
     */
    public void init(Context context) {
        mContext = context;
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : ", e);
            }
            // 退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     * 
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(final Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                ex.printStackTrace();
                Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();
        // 收集设备参数信息
        collectDeviceInfo(mContext);
        // 保存日志文件
        saveCrashInfo2File(ex);
        return true;
    }

    /**
     * 收集设备参数信息
     * 
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     * 
     * @param ex
     * @return 返回文件名称,便于将文件传送到服务器
     */
    private String saveCrashInfo2File(Throwable ex) {
        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        String time = formatter.format(new Date());
        sb.append(time + result);
        try {
            long timestamp = System.currentTimeMillis();
            String fileName = "crash.log";
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                String path =Environment.getExternalStorageDirectory().getAbsolutePath()+ "/logcat/";
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(path + fileName, true);
                fos.write((sb.toString()).getBytes());
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        return null;
    }
}

上面我们实现了这个接口,然后在奔溃前做了一些友好处理,如存储奔溃日志,主动杀死进程,不让弹出系统的强制关闭对话框。

然后我们在Application中这样引用即可

package com.hai;

import android.app.Application;

import com.hai.logcat.CrashHandler;

public class MyApplication extends Application {
    CrashHandler handler = null;

    @Override
    public void onCreate() {
        super.onCreate();
        handler = CrashHandler.getInstance();
        handler.init(getApplicationContext());
    }
}