在加载片段时显示加载微调器

本文介绍了在加载片段时显示加载微调器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我已经开发了一个基于片段的应用程序.

I have developed a fragment-based app.

我有一个带有按钮的菜单片段，这些按钮每个都打开一个新片段，以替换最后一个片段.

I have a menu fragment with buttons,these buttons open a new fragment each one, replacing the last one.

问题是，某些片段在打开时会花费一些时间，因为它会调用asynctasks并填充一些列表视图.

The issue is, that some fragment takes a while in opening cause it does some calls to asynctasks and populates some listviews.

因此，当我按下菜单片段中的按钮时，它会保持冻结 2 秒，直到出现新片段替换菜单片段.

So when I press the button in the menu fragment, it keeps freezed 2 seconds until the new fragment appears replacing the menu fragment.

我希望那时出现一个微调器或正在加载..."对话框.

I would like that a spinner or "loading.." dialog appears in that time.

我已经测试过

private progressDialog progressDialog; progressDialog = new ProgressDialog(this); progressDialog.setIndeterminate(true); progressDialog.setMessage("Loading..."); progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); progressDialog.show();

此代码显示对话框，但是在冻结屏幕时从不显示该对话框.

This code show the dialog but it never shows it when the screen is freezed.

我应该在哪里放置该代码?在包含所有片段的活动中还是在菜单片段中?还是在加载的片段中?

Where I should place that code? in the activity which contains all fragments or in the menu fragment? or maybe in the fragment which is loaded?

我没有做到这一点，所以当我在菜单片段中按下按钮时，我将执行以下代码.

I dont get to accomplish this so when in my menu fragment I press the button I do the following code.

NewAppointmentFragment fragment = new NewAppointmentFragment(); android.support.v4.app.FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.fragment_container, fragment, "NewAppointmentFragment"); fragmentTransaction.addToBackStack(null); fragmentTransactionmit();

，但是要花费2秒才能加载此新片段并出现冻结 2 秒您可以看到按下按钮的菜单片段

but it takes 2 seconds until this new fragment is loaded and appears The freezed 2 seconds you can see the menu fragment with the button pressed

可能是因为在新片段中我调用了所有异步任务和操作来填充 OnCreateView 中的列表视图?

我该如何解决此问题?

预先感谢

我的菜单片段

@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); nextAppointmentsButton = (Button) rootView.findViewById(R.id.nextAppointmentsButton); nuevaCitaButton = (Button) rootView.findViewById(R.id.nuevaCitaButton); nearbyPharmaciesButton = (Button) rootView.findViewById(R.id.nearbyPharmaciesButton); ourLocationButton = (Button) rootView.findViewById(R.id.ourLocationButton); nextAppointmentsButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { UpcomingAppointmentsFragment fragment = new UpcomingAppointmentsFragment(); android.support.v4.app.FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.fragment_container, fragment); fragmentTransaction.addToBackStack(null); fragmentTransactionmit(); } }); nuevaCitaButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { ((MainActivity)getActivity()).showProgressDialog(); NewAppointmentFragment fragment = new NewAppointmentFragment(); android.support.v4.app.FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.fragment_container, fragment, "NewAppointmentFragment"); fragmentTransaction.addToBackStack(null); fragmentTransactionmit(); } }); nearbyPharmaciesButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { NearbyPharmaciesFragment fragment = new NearbyPharmaciesFragment(); android.support.v4.app.FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.fragment_container, fragment); fragmentTransaction.addToBackStack(null); fragmentTransactionmit(); } }); ourLocationButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { OurLocationMapFragment fragment = new OurLocationMapFragment(); android.support.v4.app.FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.fragment_container, fragment); fragmentTransaction.addToBackStack(null); fragmentTransactionmit(); } }); // Inflate the layout for this fragment return rootView; }

当我按下菜单按钮时，我的新片段已加载

My new Fragment loaded when I press the menu button

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_new_appointment, container, false); // **Calls to asynctasks ** // **Populate operations ListViews** return rootView; }

推荐答案

我建议您在布局中放置一个ProgressBar小部件:

I suggest that you put a ProgressBar widget inside your layout:

<ProgressBar android:id="@+id/progress_bar" style="@style/Base.Widget.AppCompat.ProgressBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:indeterminate="true" android:visibility="visible" />

然后在您的片段中

ProgressBar mProgressBar; public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment, container, false); mProgressBar = (ProgressBar) view.findViewById(R.id.progress_bar); //other references return view; }

当您完成http请求时:

When you finish your http request:

mProgressBar.setVisibility(View.GONE);