android - Android ProgressDialog未显示

下面是连接到对话框的代码部分。当他们按下按钮后，它应该出现，在出现之后，它应该处理数据，当它完成时，它应该隐藏起来。但它甚至没有出现？

ProgressDialog dialog = new ProgressDialog(this);
dialog.setMessage("Prosimo počakajte da naloži podatke.");
dialog.setIndeterminate(false);
dialog.setCancelable(false);
dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);

private Button.OnClickListener listener = new Button.OnClickListener() {
    public void onClick(View v){
        if(selectedClass >= 0){
            dialog.show();

            ... data processing ...

            Intent firstUpdate = new Intent(context, ConfigurationActivity.class);
            firstUpdate.setAction("android.appwidget.action.APPWIDGET_ENABLED");
            firstUpdate.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widget_id);
            context.sendBroadcast(firstUpdate);

            dialog.dismiss();
            setResult(RESULT_OK, firstUpdate);
            finish();
        } else {
            Log.i("Schedule", "Missing selections");
        }
    }
};

谢谢你的帮助。

最佳答案

多亏了“布拉格纳尼”，我才得以成功。以下是最终代码：

private class ProgressTask extends AsyncTask<String, Void, Boolean>
{
    private ProgressDialog dialog;
    private ConfigurationActivity activity;

    public ProgressTask(ConfigurationActivity activity)
    {
        this.activity = activity;
        context = activity;
        dialog = new ProgressDialog(context);
    }

    private Context context;

    protected void onPreExecute()
    {
        dialog = new ProgressDialog(context);
        dialog.setMessage("Prosimo počakajte da naloži podatke.");
        dialog.setIndeterminate(false);
        dialog.setCancelable(false);
        dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        dialog.show();
    }

    @Override
    protected void onPostExecute(final Boolean success)
    {
        if (dialog.isShowing())
                    {
            dialog.dismiss();
        }
        if (success)
                    {
            Toast.makeText(context, "OK", Toast.LENGTH_LONG).show();
        }
                    else
                    {
            Toast.makeText(context, "ERROR", Toast.LENGTH_LONG).show();
        }
    }

    @Override
    protected Boolean doInBackground(final String... args)
    {
        try {
            ... processing ...

            return true;
        } catch (Exception e){
            Log.e("Schedule", "UpdateSchedule failed", e);
            return false;
        }
    }

}

呼叫班级：

new ProgressTask(ConfigurationActivity.this).execute();

谢谢布拉纳尼！

关于android - Android ProgressDialog未显示，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/16152019/