anddroid异常处理之UncaughtException

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.
1.java文件

public class CrashHandler implements Thread.UncaughtExceptionHandler {    public static final String TAG = "CrashHandler";    // CrashHandler 实例    private static CrashHandler INSTANCE = new CrashHandler();    // 程序的 Context 对象    private Context mContext;    // 系统默认的 UncaughtException 处理类    private Thread.UncaughtExceptionHandler mDefaultHandler;    // 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(2000);            } catch (InterruptedException e) {                Log.e(TAG, "error : ", e);            }            //捕获异常后退出整个应用程序            App.application.RemoveActivity();          // 结束线程，一般与移除所有Activity配合使用            android.os.Process.killProcess(android.os.Process.myPid());           // System.exit(0);        }    }    /**     * 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 (PackageManager.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());                fos.close();            }            return fileName;        } catch (Exception e) {            Log.e(TAG, "an error occured while writing file...", e);        }        return null;    }}

2.定义自己的application类，进行异常处理CrashHandler 初始化

public class App extends Application {    /**     * 全局Application，方便调用     */    public static App application;    public SharedPreferences SP;    public SharedPreferences.Editor EDIT;    public static List<Activity> list_activity; public void onCreate() {        super.onCreate();        application = this;        list_activity=new ArrayList<Activity>();        SP = getSharedPreferences("config", MODE_PRIVATE);        EDIT = SP.edit();     CrashHandler crashHandler = CrashHandler.getInstance();      crashHandler.init(application);    }    /**     * 清空退款任务栈，需要在开启每一个activity之后把其加入到list_activity集合中     */    public static void RemoveActivity(){        if(!list_activity.isEmpty()){            //list集合不为空，移除activity            for(Activity activity: list_activity){                activity.finish();            }        }    }    }

3.清单文件中声明自己的application类，添加这句话
android:name=”.自己的application类”