等到加载视图后，再将加载的数据放入其中

Question

I have this small problem. My custom View takes to load from 100 ms to 1 s depending on how fast is the phone. The view is in Fragment but I'm loading data in the MainActivity . Sometimes the data is loaded faster than the View in Fragment which happens to be blank since the data is not present in the View.

How can I delay data input into the View ?

Answer 1

There are several ways to do that. Personally I would like to suggest you to use ProgressFragment for these purpose. Here's a nice library to show a default progress animation when the data is still being loaded.

The implementation of the library is quite simple.

Add this in your gradle dependancies.

dependencies {
    compile 'com.github.johnkil.android-progressfragment:progressfragment:1.4.+'
}

Now your Fragment should extend the ProgressFragment

public class MyProgressFragment extends ProgressFragment {
    // your code of fragment
}

Setup content view in onActivityCreate() method.

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    // Setup content view
    setContentView(R.layout.content);
}

Display of indeterminate progress indicator by calling in onActivityCreated

setContentShown(false);

When the data is available, jut make sure to display the associated View in the right place.

if (this.isAdded()) setContentShown(true);

One thing you need to remember while implementing this library that you need to have a parent layout for the View you want to show/hide which layout id will be android:id="@+id/content_container"

As I said earlier, there are some other ways too. If you go through the Fragment lifecycle , you'll definitely find a way to populate your data when the View is available. Just populating your data inside onActivityCreated should help you in this case too.