android捕捉全局异常文件

package com.hdtytech.video.util;

import java.io.File; import java.io.FileOutputStream; import java.io.PrintWriter; import java.io.StringWriter; import java.io.Writer; 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 com.hdtytech.video.MyApplication;

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;

/**

• Created by lnn */

public class CrashHandler implements Thread.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(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, "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();
    sb.append(result);
    try {
        long timestamp = System.currentTimeMillis();
        String time = formatter.format(new Date());
        String fileName = "crash-" + time + "-" + timestamp + ".log";
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            String path = MyApplication.APP_ROOT + "crash" + File.separator;
            File dir = new File(path);
            if (!dir.exists()) {
                dir.mkdirs();
            }
            FileOutputStream fos = new FileOutputStream(path + fileName);
            fos.write(sb.toString().getBytes());
            fos.close();
        }
        return fileName;
    } catch (Exception e) {
        Log.e(TAG, "an error occured while writing file...", e);
    }
    return null;
}

}