Android捕获异常时候的log信息

来源：互联网发布：淘宝关键词排列顺序编辑：程序博客网时间：2024/05/20 10:14

我们在开发android应用的时候经常有这样一个情景：程序用着用着在某个地方崩溃了，每次的情况都不尽相同，这时候我们没有在电脑旁边，有电脑的时候去看代码的时候总是觉着哪儿都不可能出错。这时候我们就想如果我们能得到异常退出时候的log信息就好了。

这时候下面这一段代码就可能相当有用了：

package com.test.application;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

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;

importandroid.content.pm.PackageManager.NameNotFoundException;

import android.os.Build;

import android.os.Environment;

import android.os.Looper;

import android.util.Log;

import android.widget.Toast;

import com.duole.fm.utils.Constants;

public class CrashHandler implements UncaughtExceptionHandler{

//系统默认的UncaughtException处理类

privateThread.UncaughtExceptionHandler mDefaultHandler;

// CrashHandler实例

private staticCrashHandler instance;

// 程序的Context对象

private ContextmContext;

// 用来存储设备信息和异常信息

private Map infos = newHashMap();

//用于格式化日期,作为日志文件名的一部分

private DateFormatformatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

private CrashHandler(){

}

public staticCrashHandler getInstance() {

if (instance == null)

instance =new CrashHandler();

return instance;

}

public void init(Contextcontext) {

mContext = context;

Log.e(Constants.TAG, "error : ");

// 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);

}

@Override

public voiduncaughtException(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(Constants.TAG, "error :", e);

}

//退出程序

android.os.Process.killProcess(android.os.Process.myPid());

System.exit(1);

}

private booleanhandleException(Throwable ex) {

if (ex == null) {

returnfalse;

}

// 收集设备参数信息

collectDeviceInfo(mContext);

// 使用Toast来显示异常信息

new Thread() {

@Override

publicvoid run() {

Looper.prepare();

Toast.makeText(mContext,"很抱歉,程序出现异常,即将退出.", Toast.LENGTH_SHORT).show();

Looper.loop();

}

}.start();

// 保存日志文件

try {

saveCatchInfo2File(ex);

} catch (Exception e) {

e.printStackTrace();

}

return true;

}

public voidcollectDeviceInfo(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(Constants.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(Constants.TAG,field.getName() + " : " + field.get(null));

} catch(Exception e) {

Log.e(Constants.TAG, "anerror occured when collect crash info", e);

}

private StringsaveCatchInfo2File(Throwable ex) {

StringBuffer sb = new StringBuffer();

for (Map.Entry entry : infos.entrySet()) {

String key= entry.getKey();

Stringvalue = entry.getValue();

sb.append(key + "=" + value + "\n");

}

Writer writer = new StringWriter();

PrintWriter printWriter = newPrintWriter(writer);

ex.printStackTrace(printWriter);

Throwable cause = ex.getCause();

while (cause != null) {

cause.printStackTrace(printWriter);

cause =cause.getCause();

}

printWriter.close();

String result = writer.toString();

sb.append(result);

try {

longtimestamp = System.currentTimeMillis();

Stringtime = formatter.format(new Date());

StringfileName = "crash-" + time + "-" + timestamp + ".log";

if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){

String path =Constants.SDPATH + "/crash/";

File dir = newFile(path);

if (!dir.exists()) {

dir.mkdirs();

}

FileOutputStream fos = newFileOutputStream(path + fileName);

fos.write(sb.toString().getBytes());

// 发送给开发人员

sendCrashLog2PM(path +fileName);

fos.close();

}

returnfileName;

} catch (Exception e) {

Log.e(Constants.TAG, "an error occured while writing file...",e);

}

return null;

}

private voidsendCrashLog2PM(String fileName) {

if (!new File(fileName).exists()) {

Toast.makeText(mContext, "日志文件不存在！",Toast.LENGTH_SHORT).show();

return;

}

FileInputStream fis = null;

BufferedReader reader = null;

String s = null;

try {

fis = newFileInputStream(fileName);

reader =new BufferedReader(new InputStreamReader(fis, "GBK"));

while(true) {

s = reader.readLine();

if (s == null)

break;

//由于目前尚未确定以何种方式发送，所以先打出log日志。

Log.i("info",s.toString());

}

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally { // 关闭流

try{

reader.close();

fis.close();

} catch(IOException e) {

e.printStackTrace();

}

在Application里面加上下面这句：

CrashHandler catchHandler =CrashHandler.getInstance();

catchHandler.init(getApplicationContext());

这样就可以随时得到crash时候的log信息了

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