android Fragment 懒加载布局

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当一个页面包含多个Fragment 时，你希望不可见的Fragment 延迟到可见时再加载，下面介绍一种方法，代码如下

public abstract class LazyLoadFragment extends BaseRequestFragment {    private FrameLayout mContentView;    private Bundle mSavedInstanceState;    private boolean mIsFirstLoad = true;    @Override    public final View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        mContentView = (FrameLayout)inflater.inflate(R.layout.fragment_base_lazy_load_layout, null);        mSavedInstanceState = savedInstanceState;        return mContentView;    }    public abstract View onLazyCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState);    public final void replaceLazyView() {        FrameLayout contentView = mContentView;        View lazyCreateView = onLazyCreateView(getActivity().getLayoutInflater(), contentView, mSavedInstanceState);        if (contentView.indexOfChild(lazyCreateView) < 0) {            contentView.removeAllViews();            contentView.addView(lazyCreateView);        }    }    @Override    public void setUserVisibleHint(boolean isVisibleToUser) {        super.setUserVisibleHint(isVisibleToUser);        if (isVisibleToUser && mIsFirstLoad) {            replaceLazyView();            mIsFirstLoad = false;        }    }}

然后需要延迟加载的页面就继承LazyLoadFragment，然后重写onLazyCreateView方法初始化你的布局

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