android保存错误日志,android 收集错误log日志,并保存到sd卡上的实用类

在android 项目调试的时候,常常会出现崩溃,一些异常等,测试测的时候没有办法记录错误日志,我们在项目中写一个收集错误日志的类,方便了查看错误日志java

package util;

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.Locale;

import java.util.Map;

import com.v2application.V2Application;

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;

/**

*收集logcat，保存到SD卡

*/

public class CrashHandler implements UncaughtExceptionHandler {

public static final String TAG = CrashHandler.class.getSimpleName();

// 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 infos = new HashMap();

// 用于格式化日期,做为日志文件名的一部分

private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss", Locale.getDefault());

/** 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);

// catchNomalLogToFile();

}

/**

* 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) {

// 若是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(5000);

} catch (InterruptedException e) {

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

}

// 退出程序

System.exit(0);

}

}

/**

* 自定义错误处理,收集错误信息 发送错误报告等操做均在此完成.

*

* @param ex

* @return true:若是处理了该异常信息;不然返回false.

*/

private boolean handleException(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();

Toast.makeText(mContext, "程序出现异常", Toast.LENGTH_LONG).show();

Looper.loop();

}

}.start();

// 收集设备参数信息

collectDeviceInfo(mContext);

// 保存日志文件

saveCrashInfoToFile(ex);

// catchLog();

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, "collectDeviceInfo 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, "collectDeviceInfo an error occured when collect crash info", e);

}

}

}

private String saveCrashInfoToFile(Throwable ex){

StringBuffer sb = new StringBuffer();

for (Map.Entry 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();

sb.append(result);

try {

long timestamp = System.currentTimeMillis();

String time = formatter.format(new Date());

String fileName = "V2crash-" + time + "-" + timestamp + ".txt";

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

String path = V2Application.mLogSavePath;

File dir = new File(path);

File desFile;

if (!dir.exists()) {

boolean mkdirRes = dir.mkdirs();

if(mkdirRes){

desFile = new File(path + fileName);

if (!desFile.exists()) {

desFile.createNewFile();

}

} else {

desFile = new File(V2Application.mLogSavePath + fileName);

if (!desFile.exists()) {

desFile.createNewFile();

}

}

} else {

desFile = new File(path + fileName);

if (!desFile.exists()) {

desFile.createNewFile();

}

}

FileOutputStream fos = new FileOutputStream(desFile);

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

fos.close();

}

return fileName;

} catch (Exception e) {

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

}

return null;

}

// 把全部的log输出到文件

//@SuppressWarnings("unused")

//private void catchNomalLogToFile() {

// File createLogFile = new File(GlobalConfig.getGlobalCrashPath(mContext),

// new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss").format(new Date()) + ".txt");

// V2Log.d(TAG, "Catching log to " + createLogFile.getAbsolutePath());

String cmd = "logcat -v time -d -f " + createLogFile.getName();

//String cmd = "logcat -b system -b main -b events -b radio -v time -f " + createLogFile.getAbsolutePath();

//try {

//Runtime.getRuntime().exec(cmd);

//} catch (IOException e) {

//e.printStackTrace();

//}

//}

}

调用这个类时,用以下方法

// 收集错误信息，收集错误logcat保存到手机SD卡上

boolean sdExist = Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());

Log.i(TAG, "sdExist = "+sdExist);

if (sdExist) {

String mLogSavePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "V2_Meet7"

+ File.separator;

CrashHandler.getInstance().init(getApplicationContext());

Log.i(TAG, "错误logcat收集路径："+mLogSavePath);

}

是否是感受很简单,但愿可以帮助到你们