A fragment can be lazy.

LazyFragment.java

import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import butterknife.ButterKnife;
import butterknife.Unbinder;

/**
 * A fragment can be lazy.
 * Created by tysheng
 * Date: 2016/11/17 21:35.
 * Email: tyshengsx@gmail.com
 */

public abstract class LazyFrament extends Fragment {
    protected View mRootView;
    protected Context mContext;
    private Unbinder mBinder;
    /**
     * flag isLazyInitialized
     */
    private boolean isLazyInitialized;
    /**
     * flag isViewCreated
     */
    private boolean isViewCreated;

    private boolean isLazyMode;


    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContext = getContext();
        setLazyMode(true);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        mRootView = inflater.inflate(getLayoutId(), container, false);
        mBinder = ButterKnife.bind(this, mRootView);
        initView();
        return mRootView;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        if (!isLazyMode) initData();
        isViewCreated = true;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        mBinder.unbind();
        isLazyInitialized = false;
        isViewCreated = false;
    }

    /**
     * whether to open lazy mode.
     * <p>
     * set it in initView() or before
     *
     * @param lazyMode
     */
    public void setLazyMode(boolean lazyMode) {
        isLazyMode = lazyMode;
    }

    /**
     * Key method to lazy init data
     */
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if (getUserVisibleHint() && !isLazyInitialized && isViewCreated && isLazyMode) {
            isLazyInitialized = true;
            initData();
        }
    }

    protected abstract void initView();

    protected abstract void initData();

    protected abstract int getLayoutId();

}