Android CrashHandler

package jason.android.utils;

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;

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;

/**

 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.

 *

 * @author user

 *

 */

public class MyCrashHandler implements UncaughtExceptionHandler {

    public static final String TAG = "MyCrashHandler";

    //系统默认的UncaughtException处理类

    private Thread.UncaughtExceptionHandler mDefaultHandler;

    //CrashHandler实例

    private static MyCrashHandler INSTANCE = new MyCrashHandler();

    //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 MyCrashHandler() {

    }

    /** 获取CrashHandler实例 ,单例模式 */

    public static MyCrashHandler 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 = "/sdcard/crash/";

                File dir = new File(path);

                if (!dir.exists()) {

                    dir.mkdirs();

                }

                FileOutputStream fos = new FileOutputStream(path + fileName);

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

                Log.e("ytr",sb.toString());

                fos.close();

            }

            return fileName;

        } catch (Exception e) {

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

        }

        return null;

    }

}