在加载片段时显示加载微调器 [英] Show a loading spinner while a fragment is loading
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);
fragmentTransaction.commit();
，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);
fragmentTransaction.commit();
}
});
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);
fragmentTransaction.commit();
}
});
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);
fragmentTransaction.commit();
}
});
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);
fragmentTransaction.commit();
}
});
// 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);
这篇关于在加载片段时显示加载微调器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
