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LazyFragmentTest

Fragment may contain lots of heavy loading work, which will lead to slow loading in some cases.Using lazy loading can postpone the view initialization work to the time when activity get user focus. In this project, we try to implement Fragment lazy loading in two difference way.

The first way is using Inheritance. We use InheritedFakeFragment as base Fragment and the lazy load Fragment should override onLazyCreateView and onLazyViewCreated to replace onCreateView and onViewCreated. The lazy method will be called after base Fragment got user focus.

The second way is using Proxy. We create a proxy fragment ProxyFakeFragment and use it as a proxy to create the real Fragment.

Using InheritedFakeFragment example:

We need to change to OriginFragment to InheritedLazyFragment by changing onCreateView and onViewCreated.

public class InheritedLazyFragment extends InheritedFakeFragment {
    @Override
    public View onLazyCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_origin, container, false);
        TextView content = (TextView) view.findViewById(R.id.FragmentContent);
        content.setText(mFragmentMsg + mPos);
        Log.d("FragmentTest" + mPos, "Pos: " + mPos + " , " + "onLazyCreateView");
        return view;
    }
    
    @Override
    public void onLazyViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        Log.d("FragmentTest" + mPos, "Pos: " + mPos + " , " + "onLazyViewCreated");
    }
}

Fragment creation is the same as OriginFragment : return InheritedLazyFragment.newInstance("InheritedLazyFragment", position);.

Using ProxyFakeFragment example:

The OriginFragment don't need to change and the creation process need to use proxy as :

Bundle bundle = new Bundle();
bundle.putString(InheritedLazyFragment.FRAGMENT_MSG, "ProxyLazyFragment");
bundle.putInt(InheritedLazyFragment.FRAGMENT_POS, position);
return ProxyFakeFragment.newInstance(OriginFragment.class.getName(), bundle);

中文教程请参考：如何优化Androd App启动速度