Android实现多次闪退清除数据

public class CrashHandler implements ReportSender {
  @Override
  public void send(Context context, CrashReportData errorContent) throws ReportSenderException {
    Timber.i("闪退,检查是否需要清空数据");
    new CrashModel().checkAndClearData();
  }
}

public class CrashModel {

  private static final String KEY_CRASH_TIMES = "crash_times";
  private static final String CRASH_TIME_FILE_NAME = "crash_time";
  //不能通过App.getPackageName来获取包名，否则会有问题，只能默认为cn.campusapp.campus。所以对于debug或者运营版本，清数据会把release的清掉
  private static final String FILE_DIR = String.format("/data/data/%s/", BuildConfig.APPLICATION_ID);
  private static final String ACCOUNT_FILE_NAME = String.format("%s%s", FILE_DIR, "shared_prefs/account_pref.xml");
  private static ArrayList<String> FILES_DONTNEED_DELETE = new ArrayList<>(); //该目录中的文件不会被删除

  static {
    FILES_DONTNEED_DELETE.add(ACCOUNT_FILE_NAME); //目前账号信息文件不会被删除，但是会手动改变数据，只保留userId accessToken 和school
  }

  protected ArrayList<Long> mCrashTimes;
  Gson gson = new Gson();
  private File mFileDir;

  public CrashModel() {
    mFileDir = new File(FILE_DIR);
    mCrashTimes = readCrashTimes();
    if (mCrashTimes == null) {
      mCrashTimes = new ArrayList<>();
      storeCrashTimes(mCrashTimes);
    }
  }


  public void checkAndClearData() {
    long timeNow = System.currentTimeMillis();

    if (checkClearData(timeNow, new ArrayList<>(mCrashTimes))) {
      Timber.i("已经在5分钟之内有三次闪退，需要清理数据");
      try {
        clearData();
      } catch (Exception e) {
        Timber.e(e, "清空所有数据失败");
      }
    } else {
      mCrashTimes.add(timeNow);
      storeCrashTimes(mCrashTimes);
      Timber.i("此次不需要清空数据, %s", gson.toJson(mCrashTimes));
    }
  }

  private void storeCrashTimes(ArrayList<Long> crashTimes) {
    try {
      String str = gson.toJson(crashTimes);
      Files.writeToFile(mFileDir, CRASH_TIME_FILE_NAME, str);
    } catch (Exception e) {
      Timber.e(e, "保存闪退时间失败");
    }

  }

  private ArrayList<Long> readCrashTimes() {
    try {
      String timeStr = Files.readFileContent(mFileDir, CRASH_TIME_FILE_NAME);
      return gson.fromJson(timeStr, new TypeToken<ArrayList<Long>>() {
      }.getType());
    } catch (Exception e) {
      Timber.e(e, "读取闪退时间失败");
    }
    return null;
  }

  /**
   * 检查是否需要清空数据，目前的清空策略是在5分钟之内有三次闪退的就清空数据，也就是从后往前遍历，只要前两次闪退发生在5分钟之内，就清空数据
   *
   * @return
   */
  private boolean checkClearData(long time, ArrayList<Long> crashTimes) {
    Timber.i(gson.toJson(crashTimes));
    int count = 0;
    for (int i = crashTimes.size() - 1; i >= 0; i--) {
      long crashTime = crashTimes.get(i);
      if (time - crashTime <= 5 * 60 * 1000) {
        count++;
        if (count >= 2) {
          break;
        }
      }
    }
    if (count >= 2) {
      //在5分钟之内有三次闪退，这时候需要清空数据
      return true;
    } else {
      return false;
    }
  }

  /**
   * 清空数据，包括数据库中的和SharedPreferences中的
   *
   * @throws Exception
   */
  private void clearData() throws Exception {
    Timber.i("开始清理数据");
    Files.deleteFilesExceptSomeInDirectory(mFileDir, FILES_DONTNEED_DELETE);
  }


}

@ReportsCrashes(
  //一些ACRA的设置，具体参考ACRA文档，因为我们使用自定义Sender，所以这里完全可以不用设置
    //mailTo = "bugs@treeholeapp.cn",
    //mode = ReportingInteractionMode.TOAST,
    //resToastText = R.string.crash_toast_text
)
public class App extends Application {

  @Override
  public void onCreate() {
   if (!BuildConfig.DEBUG) { //这里我判断只有在非DEBUG下才清除数据，主要是为了在开发过程中能够保留线程。
        ACRA.init(APPLICATION_CONTEXT);
        CrashHandler handler = new CrashHandler();
        ACRA.getErrorReporter().setReportSender(handler); //在闪退时检查是否要清空数据
    }

  }
}