Question

我试图通过ListFragments实现子类别，并且我没有清除前一个片段列表的问题，并且onbackpress没有显示父列表片段。

示例这是我的父ListFragment：

package com.best.photo.now;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.ListFragment;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.best.photo.now.R;
import com.google.android.gms.analytics.GoogleAnalytics;
import com.google.android.gms.analytics.HitBuilders;
import com.google.android.gms.analytics.Tracker;

public class CategoryListFragment extends ListFragment {
    private static final String TAG = CategoryListFragment.class.getSimpleName();
    private Context mContext = null;
    private String[] mCategories = null;

    private CategoryListAdapter mAdapter = null;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        //send screen name to google
        Tracker t = ((WallpaperApplication) getActivity().getApplication()).getTracker();
        t.setScreenName(MainActivity.CATEGORY);
        t.send(new HitBuilders.AppViewBuilder().build());
        GoogleAnalytics.getInstance(getActivity()).dispatchLocalHits();

        mContext = getActivity();
        mCategories = getActivity().getResources().getStringArray(R.array.category_list);

        mAdapter = new CategoryListAdapter();
        setListAdapter(mAdapter);
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        System.out.println("Position onClick: "+position);


        if(position==2)
        {
            FragmentManager fm = getFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();
            ft.replace(R.id.fragment_container, new AbstractListFragment());

            ft.commit();


        }
        else
        {

        super.onListItemClick(l, v, position, id);
           ((OnCategoryListItemClickListern)getActivity()).onCategoryListItemClick(v);
        }

    }


    private class CategoryListAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            return mCategories.length;
        }

        @Override
        public Object getItem(int position) {
            return mCategories[position];
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View view, ViewGroup parent) {
            if(view == null) 
                view = View.inflate(mContext, R.layout.category_list_item, null);
            ((TextView)(view.findViewById(R.id.category_name))).setText(mCategories[position]);
            ((ImageView)(view.findViewById(R.id.category_image))).setImageResource(R.drawable.ic_launcher);
            view.setTag(mCategories[position]);


        return view;    
        }

    }


    public static interface  OnCategoryListItemClickListern{
        public  abstract void onCategoryListItemClick(View v);



    }
}

列表是所有类别最爱抽象动物

等......

在onListItemClick上，打开下一个片段

与第一个片段相同，除了它的onListItemClick有父母点击监听器。

package com.best.photo.now;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.ListFragment;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.best.photo.now.R;
import com.best.photo.now.CategoryListFragment.OnCategoryListItemClickListern;
import com.google.android.gms.analytics.GoogleAnalytics;
import com.google.android.gms.analytics.HitBuilders;
import com.google.android.gms.analytics.Tracker;

public class AbstractListFragment extends ListFragment {
    private static final String TAG = AbstractListFragment.class.getSimpleName();
    private Context mContext = null;
    private String[] mAbstract = null;
    private AbstractListAdapter mAdapter = null;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        //send screen name to google
        Tracker t = ((WallpaperApplication) getActivity().getApplication()).getTracker();
        t.setScreenName(MainActivity.CATEGORY);
        t.send(new HitBuilders.AppViewBuilder().build());
        GoogleAnalytics.getInstance(getActivity()).dispatchLocalHits();

        mContext = getActivity();

        mAbstract = getActivity().getResources().getStringArray(R.array.abstract_list);

        mAdapter = new AbstractListAdapter();
        setListAdapter(mAdapter);


    }


    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {

        super.onListItemClick(l, v, position, id);

         ((OnCategoryListItemClickListern)getActivity()).onCategoryListItemClick(v);



    }


    private class AbstractListAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            return mAbstract.length;
        }

        @Override
        public Object getItem(int position) {
            return mAbstract[position];
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View view, ViewGroup parent) {
            if(view == null) 
                view = View.inflate(mContext, R.layout.abstract_list_item, null);
            ((TextView)(view.findViewById(R.id.abstract_name))).setText(mAbstract[position]);
            ((ImageView)(view.findViewById(R.id.abstract_image))).setImageResource(R.drawable.ic_launcher);
            view.setTag(mAbstract[position]);


        return view;    
        }

    }


    public static interface  OnAbstractListItemClickListern{
        public  abstract void onAbstractListItemClick(View v);



    }


}

点击列表中的任何项目，查询来自flickr的搜索api并获取相关结果。哪个工作正常，但第二个片段列表未清除，并显示在图像结果的背景中。

此外，在背压时，我无法访问父列表碎片。

我在调用第二个片段时尝试使用addToBackStack（null），但它对我没用。

我在这里缺少什么？

此外，还有其他方法可以实现ListFragments的子类别，而不是为每个子类别类型创建多个ListFragments类/布局吗？

非常感谢任何帮助!!

谢谢， ARNAB

Answer 1

而不是替换尝试调用add function：

ft.add(R.id.fragment_container, new AbstractListFragment());
ft.addToBackStack(null); 
ft.commit();

从onListItemClick打开另一个ListFragment或在ListFragments中实现子类别的正确方法？

1 个答案: