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Android github XListView 分析（2-3）

热度：558   发布时间：2016-04-28 02:42:30.0
Android 演示 Android ListView 和 github XListView（3-3）

本文内容

  • 环境
  • 项目结构
  • 演示 1：简单 XListView
  • 演示 2：XListView + Fragment
  • 演示 3：XListView + ViewPager + Fragment

本文三个演示，循序渐进。

  • 演示 1 是 GitHub 上的 XListView 控件，具备“下拉更新”和“上拉加载”功能，使用它自己的示例；
  • 演示 2 是将 XListView 控件封装到 Fragment 中，个人认为，这种封装在实际项目还是比较常用的；
  • 演示 3 是进一步将 XListView 与 ViewPager 和 Fragment 相结合。也就是在演示 2 基础上，每个 ViewPager 的页都是 XListView 和 Fragment。

下载 Demo

更多 Demo

环境

  • Windows 2008 R2 64 位
  • Eclipse ADT V22.6.2，Android 4.4.2（API 19）
  • SAMSUNG GT-8618，Android OS 4.1.2

项目结构

2015-01-20_143505_副本1

图 1 项目结构和主程序界面

演示 1：简单 XListView

这是 github 上的一个项目。本演示，只是简单说明它的功能。

2

图 2 演示 1

package com.wallace.xlistview.ui;
 
import java.util.ArrayList;
 
import com.wallace.xlistview.R;
import com.wallace.xlistview.widget.XListView;
import com.wallace.xlistview.widget.XListView.IXListViewListener;
 
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Toast;
 
public class XListSimpleActivity extends Activity implements IXListViewListener {
    private XListView mListView;
    private ArrayAdapter<String> mAdapter;
    private ArrayList<String> items = new ArrayList<String>();
    private Handler mHandler;
    private int start = 0;
    private static int refreshCnt = 0;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_simple);
 
        geneItems();
 
        initClass();
 
        initControl();
 
        initXList();
 
    }
 
    private void geneItems() {
        for (int i = 0; i != 20; ++i) {
            items.add("refresh cnt " + (++start));
        }
    }
 
    private void initClass() {
        mHandler = new Handler();
    }
 
    private void initControl() {
        mListView = (XListView) findViewById(R.id.xListView_a);
        mAdapter = new ArrayAdapter<String>(this, R.layout.xlist_simpleitem,
                items);
    }
 
    private void initXList() {
        mListView.setPullLoadEnable(true);
        mListView.setPullRefreshEnable(true);
        mListView.setAdapter(mAdapter);
        mListView.setXListViewListener(this);
        mListView.setOnItemClickListener(new OnItemClickListener() {
 
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
 
                Toast.makeText(getApplicationContext(), items.get(position),
                        Toast.LENGTH_SHORT).show();
            }
        });
        mListView.setOnItemSelectedListener(new OnItemSelectedListener() {
 
            @Override
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                Toast.makeText(getApplicationContext(), items.get(position),
                        Toast.LENGTH_SHORT).show();
            }
 
            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });
    }
 
    private void onLoad() {
        mListView.stopRefresh();
        mListView.stopLoadMore();
        mListView.setRefreshTime("刚刚");
    }
 
    // Refresh
    @Override
    public void onRefresh() {
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                start = ++refreshCnt;
                items.clear();
                geneItems();
                // mAdapter.notifyDataSetChanged();
                mAdapter = new ArrayAdapter<String>(XListSimpleActivity.this,
                        R.layout.xlist_simpleitem, items);
                mListView.setAdapter(mAdapter);
                onLoad();
            }
        }, 2000);
    }
 
    // LoadMore
    @Override
    public void onLoadMore() {
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                geneItems();
                mAdapter.notifyDataSetChanged();
                onLoad();
            }
        }, 2000);
    }
}

演示 2：XListView + Fragment

接下来，我就在想，如何将 XListView 放到 Fragment 中，毕竟实际项目中，这种情况可能会多点，这样，就能将 Fragment 放到 FrameLayout 里。顺便把数据换成自己的。

3

图 3 演示 2

package com.wallace.xlistview.view;
 
import java.util.ArrayList;
import java.util.List;
 
import com.wallace.xlistview.R;
import com.wallace.xlistview.dao.MusicDao;
import com.wallace.xlistview.entity.MusicItemEntity;
import com.wallace.xlistview.utils.ImageLoader;
import com.wallace.xlistview.widget.XListView;
import com.wallace.xlistview.widget.XListView.IXListViewListener;
 
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
 
@SuppressLint({ "ValidFragment", "HandlerLeak" })
public class MusicXListFragment extends Fragment implements IXListViewListener {
 
    protected List<MusicItemEntity> musics = null;
    private MusicDao musicDao;
    protected Activity mActivity;
    protected XListView listview;
    protected NewXListFragmentAdapter mAdapter;
    protected View view;
    public LayoutInflater mInflater;
    private Handler mHandler;
 
    public MusicXListFragment(Activity c, List<MusicItemEntity> list) {
        this.mActivity = c;
 
        if (list != null) {
            this.musics = list;
        }
    }
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mHandler = new Handler();
        musicDao = new MusicDao(this.mActivity);
    }
 
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        mInflater = inflater;
        view = inflater.inflate(R.layout.xlist_main, null);
        listview = (XListView) view.findViewById(R.id.xListView_b);
        listview.setPullLoadEnable(true);
        listview.setPullRefreshEnable(true);
        listview.setXListViewListener(this);
        mAdapter = new NewXListFragmentAdapter(mActivity, this.musics);
        listview.setAdapter(mAdapter);
        return view;
    }
 
    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
    }
 
    protected void onLoad() {
        listview.stopRefresh();
        listview.stopLoadMore();
        listview.setRefreshTime("刚刚");
    }
 
    /**
     * onRefresh
     */
    @Override
    public void onRefresh() {
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                new MyTask().execute(musicDao);
                onLoad();
            }
        }, 2000);
    }
 
    /**
     * onLoadMore
     */
    @Override
    public void onLoadMore() {
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                new MyTask().execute(musicDao);
                onLoad();
            }
        }, 2000);
    }
 
    class NewXListFragmentAdapter extends BaseAdapter {
 
        private Activity activity;
        private LayoutInflater inflater = null;
        public ImageLoader imageLoader;
        private List<MusicItemEntity> musics;
 
        public NewXListFragmentAdapter(List<MusicItemEntity> lists) {
 
            musics = lists;
            inflater = (LayoutInflater) activity
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            imageLoader = new ImageLoader(activity.getApplicationContext());
        }
 
        public NewXListFragmentAdapter(Activity a, List<MusicItemEntity> lists) {
            activity = a;
            musics = lists;
            inflater = (LayoutInflater) activity
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            imageLoader = new ImageLoader(activity.getApplicationContext());
        }
 
        public void appendToList(List<MusicItemEntity> lists) {
 
            if (lists == null) {
                return;
            }
            if (musics == null) {
                musics = new ArrayList<MusicItemEntity>();
            }
            musics.addAll(lists);
            notifyDataSetChanged();
        }
 
        public int getCount() {
            return musics == null ? 0 : musics.size();
        }
 
        public Object getItem(int position) {
            return position;
        }
 
        public long getItemId(int position) {
            return position;
        }
 
        public View getView(int position, View convertView, ViewGroup parent) {
            View vi = convertView;
            if (convertView == null)
                vi = inflater.inflate(R.layout.xlist_row, null);
 
            MusicItemEntity song = null;
 
            ImageView image = (ImageView) vi.findViewById(R.id.imagethumb);
            TextView tvartist = (TextView) vi.findViewById(R.id.artist);
            TextView tvtitle = (TextView) vi.findViewById(R.id.title);
            TextView tvduration = (TextView) vi.findViewById(R.id.duration);
 
            song = musics.get(position);
            imageLoader.DisplayImage(song.getThumbUrl(), image);
            tvartist.setText(song.getArtist());
            tvtitle.setText(song.getTitle());
            tvduration.setText(song.getDuration());
 
            return vi;
        }
    }
    
    /**
     * MyTask
     */
    public class MyTask extends
            AsyncTask<MusicDao, String, List<MusicItemEntity>> {
 
        public MyTask() {
        }
 
        public MyTask(boolean useCache) {
        }
 
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }
 
        @Override
        protected List<MusicItemEntity> doInBackground(MusicDao... params) {
            MusicDao dao = params[0];
            List<MusicItemEntity> list = dao.getMore();
            return list;
        }
 
        @Override
        protected void onPostExecute(List<MusicItemEntity> result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            mAdapter.appendToList(result);
            mAdapter.notifyDataSetChanged();
        }
    }
}

说明：当然，你也可以把 NewXListFragmentAdapter 类单独写成一个 .java 文件，这里只是为了演示方便，但是 Demo 里是独立的。

演示 3：XListView + ViewPager + Fragment

然后再想，在演示 2 基础上，每个 Fragment 如何变成 ViewPager 的一页。

4

图 4 演示 3

package com.wallace.xlistview.ui;
 
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
import com.wallace.xlistview.R;
//import com.wallace.xlistview.adapter.NewXListPageFragmentAdapter;
import com.wallace.xlistview.dao.MusicDao;
import com.wallace.xlistview.entity.CategorysEntity;
import com.wallace.xlistview.entity.MusicList;
import com.wallace.xlistview.view.HttpErrorFragment;
import com.wallace.xlistview.view.MusicXListFragment;
 
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.ViewGroup;
import android.view.Window;
 
public class XListPagerFragmentActivity extends FragmentActivity {
 
    private ViewPager mViewPager;
    private NewXListPageFragmentAdapter mBasePageAdapter;
    private PagerTabStrip mPagerTabStrip;
    private List<MusicList> categoryList;
    private MusicDao musicDao;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_viewpager);
 
        initClass();
 
        initControl();
 
        initViewPager();
    }
 
    private void initControl() {
        mViewPager = (ViewPager) findViewById(R.id.above_pager);
        mPagerTabStrip = (PagerTabStrip) findViewById(R.id.myPagerTabStrip);
    }
 
    private void initClass() {
        musicDao = new MusicDao(this);
        mBasePageAdapter = new NewXListPageFragmentAdapter(
                this.getSupportFragmentManager());
        mBasePageAdapter.setActvity(XListPagerFragmentActivity.this);
    }
 
    private void initViewPager() {
        mPagerTabStrip.setTabIndicatorColor(getResources()
                .getColor(R.color.red));
        mPagerTabStrip.setDrawFullUnderline(false);
        mPagerTabStrip.setBackgroundColor(getResources()
                .getColor(R.color.green));
        // mPagerTabStrip.setTextSpacing(50);
 
        mViewPager.setOffscreenPageLimit(0);
        mViewPager.setAdapter(mBasePageAdapter);
 
        new MyTask().execute(musicDao);
    }
 
    /* execute after killed */
    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
    }
 
    class NewXListPageFragmentAdapter extends FragmentStatePagerAdapter {
 
        public ArrayList<Fragment> mFragments = new ArrayList<Fragment>();
        public List<CategorysEntity> tabs = new ArrayList<CategorysEntity>();
 
        private Activity mActivity;
 
        public NewXListPageFragmentAdapter(FragmentManager fragmentManager) {
            // TODO Auto-generated constructor stub
            super(fragmentManager);
        }
 
        public void setActvity(Activity a) {
            this.mActivity = a;
        }
 
        public void addFragment(List<CategorysEntity> mList,
                List<MusicList> listObject) {
            tabs.addAll(mList);
            for (int i = 0; i < listObject.size(); i++) {
                MusicList musics = listObject.get(i);
                addTab(new MusicXListFragment(mActivity, musics.getMusics()));
            }
        }
 
        /**
         * only load listview, donot include tabs
         * 
         * @param listObject
         */
        public void addFragment(List<MusicList> listObject) {
            for (int i = 0; i < listObject.size(); i++) {
                MusicList musics = listObject.get(i);
                addTab(new MusicXListFragment(mActivity, musics.getMusics()));
            }
        }
 
        public void addNullFragment() {
            CategorysEntity cate = new CategorysEntity();
            cate.setName("connect error");
            tabs.add(cate);
            addTab(new HttpErrorFragment());
        }
 
        public void Clear() {
            mFragments.clear();
            tabs.clear();
        }
 
        public void addTab(Fragment fragment) {
            mFragments.add(fragment);
            notifyDataSetChanged();
        }
 
        @Override
        public CharSequence getPageTitle(int position) {
            Log.d("vp-getPageTitle", tabs.get(position).getName());
            return tabs.get(position).getName();
        }
 
        @Override
        public Fragment getItem(int arg0) {
            Log.d("vp-getItem", String.format("%s", arg0));
            return mFragments.get(arg0);
        }
 
        // 初始化每个页卡选项
        @Override
        public Object instantiateItem(ViewGroup arg0, int position) {
            Log.d("vp-instantiateItem", String.format("%s", position));
            return super.instantiateItem(arg0, position);
        }
 
        @Override
        public int getCount() {
            Log.d("vp-instantiateItem", String.format("%s", mFragments.size()));
            return mFragments.size();
        }
 
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            // TODO Auto-generated method stub
            super.destroyItem(container, position, object);
        }
    }
 
    public class MyTask extends
            AsyncTask<MusicDao, String, Map<String, Object>> {
 
        public MyTask() {
        }
 
        public MyTask(boolean useCache) {
        }
 
        @Override
        protected void onPreExecute() {
            mViewPager.removeAllViews();
            mBasePageAdapter.Clear();
            super.onPreExecute();
        }
 
        @Override
        protected Map<String, Object> doInBackground(MusicDao... params) {
            MusicDao dao = params[0];
            List<CategorysEntity> categorys = new ArrayList<CategorysEntity>();
            Map<String, Object> map = new HashMap<String, Object>();
 
            if ((categoryList = dao.getClassEntity()) != null) {
                categorys = dao.getCategorys();
                map.put("tabs", categorys);
                map.put("list", categoryList);
            }
 
            return map;
            // return null;
        }
 
        @SuppressWarnings("unchecked")
        @Override
        protected void onPostExecute(Map<String, Object> result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            mBasePageAdapter.Clear();
            mViewPager.removeAllViews();
            if (result != null && !result.isEmpty()) {
                mBasePageAdapter.addFragment(
                        (List<CategorysEntity>) result.get("tabs"),
                        (List<MusicList>) result.get("list"));
            } else {
                mBasePageAdapter.addNullFragment();
            }
            mBasePageAdapter.notifyDataSetChanged();
            mViewPager.setCurrentItem(0);
        }
    }
}

说明：当然，你也可以把 NewXListPageFragmentAdapter 类单独写成一个 .java 文件，这里只是为了演示方便，但是 Demo 里是独立的。

注意：演示 3 是有问题的，不知道为什么 ViewPager 每页的名字显示不出来。

 

Android 演示 Android ListView 和 github XListView（1-3）

Android github XListView 分析（2-3）

 

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