分享一个没有bug的我修改改良过的Fragment懒加载代码

简书链接:分享一个没有bug的我修改改良过的Fragment懒加载代码
文章字数：284,阅读全文大约需要1分钟
很多时候 一个fragment可能放在不同地方，但是子类是做了某些刷新的封装，到第哪些需要懒加载哪些 不需要，或者需要但是 所嵌套的层次不同，都会出现不一样的毛病
比如子fragment,放在viewpager里面放在viewpager里面的 子fragment等等。如果出现问题了设置setOnStartNeedCheckData 为true即可。

package cn.qssq666.rapiddevelopframe.base.fragment;

import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.BuildConfig;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import cn.qssq666.rapiddevelopframe.global.SuperAppContext;
import cn.qssq666.rapiddevelopframe.utils.FragmentUtil;
import cn.qssq666.rapiddevelopframe.utils.Prt;

/**
 * Created by 情随事迁([email protected]) on 2017/2/22.
 */

public abstract class BaseLazyLoadFragment extends SuperFragment implements FragmentUtil.FragmentOnStartNeedCheckVisible<BaseLazyLoadFragment> {
    public final String TAG = this.getClass().getName();
    protected boolean mIsViewCreated;

    public View getView() {
        return mView;
    }

    private View mView;

    @Nullable
    @Override
    public final View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        if (mView == null || mIsViewCreated == false) {//mInitfalse则重新加载

            mView = onCreateViewFix(inflater, container, savedInstanceState);
        }
        return mView;

    }

    abstract protected View onCreateViewFix(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState);

    @Override
    public final void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        if (!mIsViewCreated) {
            mIsViewCreated = true;
            if (!isLazyLoadMode()) {
                if(cn.qssq666.rapiddevelopframe.BuildConfig.DEBUG){
                    Log.w(TAG,"LAZY-FRAGMENT-INIT-onViewCreatedFix-ABSTRACT");
                }
                onViewCreatedFix(view, savedInstanceState);
            } else {
                lazyLoad();//但是如果不可见也是没法调用的.
            }
        }
    }

    public abstract void onViewCreatedFix(View view, @Nullable Bundle savedInstanceState);

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        if (mView != null) {
            ViewGroup viewGroup = ((ViewGroup) mView.getParent());
            if (viewGroup != null) {
                viewGroup.removeView(mView);
            }
        }

    }


    /**
     * Fragment当前状态是否可见
     */
    protected boolean isVisible = false;
    protected boolean mIsLoadData;

    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);

        if (getUserVisibleHint()) {
            isVisible = true;
            onVisible();
        } else {
            isVisible = false;
            onInvisible();
        }
    }


    /**
     * 可见
     */
    protected void onVisible() {
        lazyLoad();
    }


    /**
     * 不可见
     */
    protected void onInvisible() {


    }

    @Override
    public void onStart() {
        super.onStart();
        isVisible = true;
        if (onStartNeedCheckData()) {

            if (!hasInitData() && isLazyLoadMode()) {//在viewpager里面没问题,但是单纯的fragment如 畅销故事需要写这个.可能是因为adapter适配器的不同导致的.
                lazyLoad();
            }
        }

    }

    public boolean onStartNeedCheckData() {
        return mOnStartNeedCheckData;
    }

    /**
     * 如果是fragment里面的fragment则需要。
     *
     * @param mOnStartNeedCheckData
     * @return
     */
    public BaseLazyLoadFragment setOnStartNeedCheckData(boolean mOnStartNeedCheckData) {
        this.mOnStartNeedCheckData = mOnStartNeedCheckData;
        return this;
    }

    boolean mOnStartNeedCheckData;

    @Override
    public void onStop() {
        super.onStop();
        isVisible = false;
    }

    public String getTAG() {
        return "BaseLazy";
    }

    protected boolean hasInitData() {
        return mIsLoadData;
    }

    /**
     * 延迟加载
     * 子类必须重写此方法
     */
    protected void lazyLoad() {
        if (isLazyLoadMode()) {

            if (!mIsViewCreated || !isVisible) {
                Log.w(TAG, "lazyLoad call return :init?" + mIsViewCreated + ",是否可见:" + isVisible);
                return;
            }
            if (getActivity() == null) {

                Prt.e(TAG, "activity为空" + this.getClass().getSimpleName());
                if (BuildConfig.DEBUG) {
                    SuperAppContext.showToast("" + "activity为空" + this.getClass().getSimpleName());
                }
                return;
            }
            if (mIsLoadData) {
                if(BuildConfig.DEBUG){
                Log.w(TAG, "页面已经加载了并显示过了,忽略init " + this.getClass());
                }
                return;
            }
            mIsLoadData = true;
            onViewCreatedFix(mView, null);

        }

    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (BuildConfig.DEBUG) {
            Prt.w(TAG, "onAttach");

        }
    }

    protected boolean isLazyLoadMode() {
        return lazyLoadMode;
    }

    public BaseLazyLoadFragment setLazyLoadMode(boolean lazyLoadMode) {
        this.lazyLoadMode = lazyLoadMode;
        return this;
    }

    boolean lazyLoadMode = true;


}