PullTorefreshGridView网络数据展示

原创于 2018-11-22 15:24:53 发布 · 150 阅读

CC 4.0 BY-SA版权

本文介绍如何在Android应用中使用PullTorefreshGridView组件来展示从网络获取的数据。首先，需要导入相关依赖，然后在MainActivity中设置并初始化组件。接着，创建GridAdapter用于填充数据，最后，实现数据加载和刷新的逻辑。

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导依赖

    implementation project(':library')
    implementation 'com.google.code.gson:gson:2.8.5'
    implementation 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'

MainAcitivty单纯的展示

public class MainActivity extends AppCompatActivity {

    private PullToRefreshGridView gridView;
    private GridAdapter adapter;
    private int mpage=1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        gridView=findViewById(R.id.gridview);

        adapter = new GridAdapter(MainActivity.this);

        gridView.setAdapter(adapter);
        gridView.setMode(PullToRefreshBase.Mode.BOTH);
        GridView refreshableView = gridView.getRefreshableView();
        refreshableView.setNumColumns(2);//设置展示个数
        gridView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<GridView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) {
                mpage=1;
                getData();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<GridView> refreshView) {
                getData();
            }
        });
        getData();
    }
    public void getData(){
        NetUtil.getIntance().requestData("http://api.expoon.com/AppNews/getNewsList/type/1/p/" + mpage, ContentBean.class, new NetUtil.CallBack<ContentBean>() {
            @Override
            public void onsuccess(ContentBean contentBean) {
                if(mpage==1){
                    adapter.setMlist(contentBean.getData());
                }else{
                    adapter.addMlist(contentBean.getData());
                }
                mpage++;
                gridView.onRefreshComplete();
            }
        });
    }
}

GridAdapter

public class GridAdapter extends BaseAdapter {

    private Context context;
    private List<ContentBean.DataBean> mlist;

    public GridAdapter(Context context) {
        this.context = context;
        mlist=new ArrayList<>();
    }

    public void setMlist(List<ContentBean.DataBean> mlist) {
        this.mlist = mlist;
        notifyDataSetChanged();
    }
    public void addMlist(List<ContentBean.DataBean> list){
        if(list!=null){
            mlist.addAll(list);
        }
        notifyDataSetChanged();
    }
    @Override
    public int getCount() {
        return mlist.size();
    }

    @Override
    public ContentBean.DataBean getItem(int position) {
        return mlist.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Viewholder viewholder;
        if(convertView==null){
            viewholder=new Viewholder();
            convertView=LayoutInflater.from(context).inflate(R.layout.item,parent,false);
            viewholder.imageView=convertView.findViewById(R.id.image);
            viewholder.textView=convertView.findViewById(R.id.text);
            convertView.setTag(viewholder);
        }else{
            viewholder= (Viewholder) convertView.getTag();
        }
        ImageLoader.getInstance().displayImage(getItem(position).getPic_url(),viewholder.imageView);
        viewholder.textView.setText(getItem(position).getNews_title());
        return convertView;
    }
    class Viewholder{
        ImageView imageView;
        TextView textView;
    }
}

工具类就不写了