public class CrashHandler implements Thread.UncaughtExceptionHandler {
    private final String TAG = "CrashHandler";

    //系統預設的UncaughtException處理類       
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    //CrashHandler例項
    private static CrashHandler instance;
    //程式的Context物件
 
    private Context mContext;

    //用來儲存裝置資訊和異常資訊
    private Map<String, String> mInfos = new HashMap<>();
    private DateFormat mFormat = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

    /**
     * 保證只有一個CrashHandler例項
     */
    private CrashHandler() {
    }

    /**
     * 獲取CrashHandler
 
例項 ,單例模式
     */
    public static CrashHandler getInstance() {
        if (instance == null)
            instance = new CrashHandler();
        return instance;
    }

    /**
     * 初始化
     */
    public void init(Context context) {
        mContext = context.getApplicationContext();
        //獲取系統預設的
 
UncaughtException處理器      
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        //設定該CrashHandler為程式的預設處理器      
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 當UncaughtException發生時會轉入該函式來處理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        Log.e(TAG, "uncaughtException: " + thread.toString(), ex);
        if (!handleException(ex) && mDefaultHandler != null) {
            //如果使用者沒有處理則讓系統預設的異常處理器來處理      
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : ", e);
            }
            //退出程式

            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 自定義錯誤處理,收集錯誤資訊 傳送錯誤報告等操作均在此完成.
     *
     * @param ex
     * @return true:如果處理了該異常資訊;否則返回false.
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        //使用Toast來顯示異常資訊
        new Thread() {
            @Override
            public void run() {

		//這句是關鍵
                TntApplication.appExit();//先把所有開啟的activity關閉掉，才能退出app
                Looper.prepare();
                LogUtils.e("出現異常了,退出程式");
                //Toast.makeText(mContext, "很抱歉,程式出現異常,即將退出.", Toast.LENGTH_SHORT).show();
                Looper.loop();
            }
        }.start();


        //儲存日誌檔案
        if (Config.LOG) {
            saveCatchInfo2File(ex);
        }
        return true;
    }

    /**
     * 儲存錯誤資訊到檔案中
     *
     * @param ex
     * @return 返回檔名稱, 便於將檔案傳送到伺服器
     */
    private void saveCatchInfo2File(Throwable ex) {
        //儲存相關的字串資訊
        StringBuffer sb = new StringBuffer();
        //將成員變數 Map<String, String> mInfos  中的資料 儲存到 StringBuffer sb 中
        for (Map.Entry<String, String> entry : this.mInfos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        //將 StringBuffer sb 中的字串寫出到檔案中
        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 = mFormat.format(new Date(timestamp));
            String fileName = "crash-" + time + "-" + timestamp + ".txt";
            if (Environment.getExternalStorageState().equals(
                    Environment.MEDIA_MOUNTED)) {
                //獲取檔案輸出路徑
                String path = Environment.getExternalStorageDirectory()
                        + "/crashinfo/";
                //建立資料夾和檔案
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                //建立輸出流
                FileOutputStream fos = new FileOutputStream(path + fileName);
                //向檔案中寫出資料
                fos.write(sb.toString().getBytes());
                fos.close();

                Log.d(TAG, "save crash log:" + path + fileName);
            }
            //return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        //return null;
    }

    /**
     * 將捕獲的導致崩潰的錯誤資訊傳送給開發人員
     * <p>
     * 目前只將log日誌儲存在sdcard 和輸出到LogCat中，並未傳送給後臺。
     */
    private void sendCrashLog2PM(String fileName) {
        if (!new File(fileName).exists()) {
            Toast.makeText(mContext, "日誌檔案不存在！", Toast.LENGTH_SHORT).show();
            return;
        }
        FileInputStream fis = null;
        BufferedReader reader = null;
        String s = null;
        try {
            fis = new FileInputStream(fileName);
            reader = new BufferedReader(new InputStreamReader(fis, "GBK"));
            while (true) {
                s = reader.readLine();
                if (s == null) break;
                //由於目前尚未確定以何種方式傳送，所以先打出log日誌。  
                Log.i("info", s.toString());
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {   // 關閉流
            try {
                reader.close();
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}