捕捉异常

在于设备不好链接的情况下，我们最好选择将异常生成log下来。这样就会方便许多。
package com.home.exception;

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.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;




import com.android.util.CommonToast;
import com.android.util.GetFileSize;
import com.redbull.log.Logger;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Handler;
import android.os.Looper;

public class CrashHandler implements UncaughtExceptionHandler {

    /**
     * 记录错误日志文件到本地路径
     */
    public static String logEPath = "mnt/sdcard/Android/logE";

    // CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    // 程序的Context对象
    private Context mContext;
    GetFileSize getSize;
    // int count = 0;
    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;

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

    private CrashHandler() {

    }

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

    /**
     * 初始化
     * 
     * @param context
     */
    public void init(Context context) {

        mContext = context;
        getSize = new GetFileSize(logEPath);
        // 获取系统默认的UncaughtException
        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(3 * 1000);
            } catch (Exception e) {
                Logger.e("Error","error:" + e.getMessage() + "," + e.toString());
            }
            // 退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            myHandler.sendEmptyMessage(1);
            System.exit(0);
            // to restart the project

        }
    }

    Handler myHandler = new Handler() {

        public void handleMessage(android.os.Message msg) {
            toReRoot();
        };
    };

    public void toReRoot() {

        // VLCApplication.EditShare(false);
        // Intent i = new Intent().setClass(mContext, BeforePreActivity.class);
        // /**
        // * i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); the sentence is to over
        // * whole the activity of the process
        // * */
        // i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        // mContext.startActivity(i);
        PackageManager manager = mContext.getPackageManager();
        Intent it = manager.getLaunchIntentForPackage("com.example.clock");
        it.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP
                | Intent.FLAG_ACTIVITY_NEW_TASK);
        mContext.startActivity(it);

    }

    /**
     * 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 处理了该异常信息返回true，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();
                CommonToast toast = new CommonToast(mContext);
                toast.setDuration(1000);
                toast.setText("很抱歉，程序获取数据受阻，将为您重新加载。。");
                toast.show();
                Looper.loop();
                super.run();
            }

        }.start();
        getSize.toDoFile();
        // 保存日志文件到本地
        saveCrashInfo(ex);
        return true;
    }

    /**
     * 保存错误信息到文件中
     * 
     * @param ex
     * @return
     */
    private File saveCrashInfo(Throwable ex) {
        File Lfile = new File(logEPath);

        StringBuffer sb = new StringBuffer();

        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());

            File dir = new File(logEPath);

            String fileName = "homecrash-" + time + "-" + timestamp + ".log";
            if (!dir.exists()) {
                System.out.println("dir.mkdirs();");
                dir.mkdirs();
            }

            File file = new File(dir, fileName);
            if (!file.exists()) {
                file.createNewFile();
            }
            FileOutputStream fos = new FileOutputStream(file);

            fos.write(sb.toString().getBytes());
            System.out.println("fos is==>" + fos);
            fos.close();

            return file;
        } catch (Exception e) {
            Logger.e("an error occured while writing file...", "" + e);
        }
        return null;
    }

}