AsyncTask进度对话框问题

Question

我有一个自定义的AsyncTask类，我想将其用于GCM注册以及在“我的服务器”上的注册。 注册是可以的，因为可以。 但是，如果我在AsyncTask中创建，则在注册仍在进行时无法显示进度对话框。 任务开始后，进度对话框消失。 但是，我只想在GCM注册完成，我的服务器注册完成并将一些数据上传到服务器后关闭它。 可能有人可以帮助我使这一切正常。 也许有人可以向我展示一些更适合这种情况的变体。 GCM类和注册方法取自gcm android示例。

My AsyncTask class code(just for screen rotation):

public abstract class GNCustomAsyncTask<TParams, TProgress, TResult> extends AsyncTask<TParams, TProgress, TResult> {
protected GNCommunityApplication mApp;
protected Activity mActivity;

public GNCustomAsyncTask(Activity activity) {
    mActivity = activity;
    mApp = (GNCommunityApplication) mActivity.getApplication();
}

public void setActivity(Activity activity) {
    mActivity = activity;
    if (mActivity == null) {
        onActivityDetached();
    } else {
        onActivityAttached();
    }
}

protected void onActivityAttached() {}

protected void onActivityDetached() {}

@Override
protected void onPreExecute() {
    mApp.addTask(mActivity, this);
}

@Override
protected void onPostExecute(TResult result) {
    mApp.removeTask(this);
}

@Override
protected void onCancelled() {
    mApp.removeTask(this);
}
}

注册短代码：

private static void checkRegistration(final Context context) {
    final String gid = GCMRegistrar.getRegistrationId(context);
    final Integer sid = CommonUtils.getSid(context);

    if (gid.equals("")) {
        // Automatically registers application on startup.
        GCMRegistrar.register(context, SENDER_ID);
    } else {
        // Device is already registered on GCM
        if (sid == null) {
            ServerUtils.register(context, gid, CommonUtils.getImsi(context));
        }
    }
}

我的AsyncTask：

private static class GetRegistrationIDTask extends GNCustomAsyncTask<Object, Integer, Integer> {

    private static final String TAG = "DoBackgroundTask";

    private ProgressDialog mProgress;
    private int mCurrProgress;
    private RegistrationActivity activity;

    public GetRegistrationIDTask(RegistrationActivity activity) {
        super(activity);
        this.activity = activity;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        showProgressDialog();
    }

    @Override
    protected void onActivityDetached() {
        if (mProgress != null) {
            mProgress.dismiss();
            mProgress = null;
        }
    }

    @Override
    protected void onActivityAttached() {
        showProgressDialog();
    }

    private void showProgressDialog() {
        mProgress = new ProgressDialog(mActivity);
        mProgress.setMessage("Registering...");
        mProgress.setCancelable(false);
        mProgress.setProgressStyle(ProgressDialog.STYLE_SPINNER );
        mProgress.show();
        mProgress.setProgress(mCurrProgress);
    }

    @Override
    protected Integer doInBackground(Object... params) {
        checkRegistration(activity);
        Integer sid = CommonUtils.getSid(activity);
        return sid;
    }

    @Override
    protected void onProgressUpdate(Integer... progress) {
        mCurrProgress = progress[0];
        if (mActivity != null) {
            mProgress.setProgress(mCurrProgress);
        }
        else {
            Log.d(TAG, "Progress updated while no Activity was attached.");
        }
    }

    @Override
    protected void onPostExecute(Integer sid) {
        super.onPostExecute(null);
        if (mActivity != null) {
            Toast.makeText(activity, "SID: " + sid, Toast.LENGTH_LONG).show();
            mProgress.dismiss();
            GCMRegistrar.unregister(activity);
        } else {
            Log.d(TAG, "AsyncTask finished while no Activity was attached.");
        }
    }

}

Answer 1

很简单，在GCMIntentService.onRegistered()方法中设置一个static boolean值true ，然后在AsyncTask's onPostExecute()方法中检查此布尔变量值。 如果false重复GCM注册过程，否则关闭进度对话框。