Question

我开发了一个基于片段的应用程序。

我有一个带按钮的菜单片段，这些按钮每个按钮打开一个新片段，替换最后一个片段。

问题是，某些片段在开放时需要一段时间，因为它会对asynctasks进行一些调用并填充一些列表视图。

因此，当我按下菜单片段中的按钮时，它会一直冻结2秒，直到新片段出现，取代菜单片段。

我想要一个微调器或者＃34;装载......＆＃34;对话框出现在那个时间。

我已经测试了这个

        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在屏幕冻结时从不显示该对话框。

我应该放置那些代码？在包含所有片段的活动中还是在菜单片段中？或者可能在加载的片段中？

我没有完成这个，所以当我在菜单片段中按下按钮时，我会执行以下代码。

         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();

但是这个新片段加载并显示需要2秒钟冻结2秒，你可以看到按下按钮的菜单片段

可能是新片段中的原因我调用了所有的asynctasks和操作来填充OnCreateView中的listviews吗？

我该如何解决这个问题？

提前致谢

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;
        }

按下菜单按钮

时加载了我的新片段

      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;
      }

Answer 1

private ProgressDialog mProgressDialog;

mProgressDialog = new ProgressDialog(this);

mProgressDialog.setMessage("Working ...");

private void doSomeWorkMethod() {

mProgressDialog.show();

doSomeWork . . .

mProgressDialog.dismiss();

Snackbar.make(v, "Work Complete.", Snackbar.LENGTH_LONG)
  .setAction("Action", null).show();
}

Answer 2

我建议您在布局中放置一个ProgressBar小部件：

<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" />

然后在你的片段中：

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;
}

完成http请求后：

mProgressBar.setVisibility(View.GONE);

Answer 3

如果您按照这些步骤操作，则不应冻结用户界面：

加载新片段
启动异步任务
在要加载数据的Progressdialog构造函数中初始化AsyncTask
使用Progressdialog

onPreExecute()

AsyncTask

使用dialog.show()

Progressdialog

onPostExecute()

AsyncTask

更新UI /将新数据设置为适配器等。

片段加载时显示加载微调器

3 个答案: