GridView(刷新加载更多)

Caihua_CN

于 2018-04-28 16:24:01 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/Caihua_CN/article/details/80136558

本文详细介绍了如何在Android应用中使用GridView组件实现下拉刷新和上滑加载更多的功能。通过结合Adapter和监听器，我们可以优雅地处理数据加载和更新，提升用户体验。

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bulid里面加入

compile 'com.github.userswlwork:pull-to-refresh:1.0.0'

public class OtherActivity extends AppCompatActivity {

    private PullToRefreshGridView gridView;
    private boolean b;//判断上拉还是下拉
    int index = 1;
    private List<Userbean.NewslistBean> newslists=new ArrayList<>();//定义集合。存放数据
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_other);

        gridView = findViewById(R.id.Grid);

        task();
        listen();

    }
//支持刷新
    private void listen() {
        gridView.setMode(PullToRefreshBase.Mode.BOTH);
        //设置拉动监听器
        gridView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<GridView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<GridView> pullToRefreshBase) {
                b=true;
                index=1;//上拉刷新初始化第一页
                task();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<GridView> pullToRefreshBase) {
                b=false;
                index++;
                task();
            }
        });
    }


    private void task() {

        Task Mytask= new Task();
        Mytask.execute("http://api.tianapi.com/meinv/?key=11ea949d63cdcfc91838cb62177c0f00&num=10&pager="+index);
    }

    class Task extends AsyncTask<String,Void,String>{
        @Override
        protected String doInBackground(String... strings) {

            OkHttpClient okHttpClient =  new OkHttpClient();
            Request request = new Request.Builder().url(strings[0]).build();
            try {
                Response response = okHttpClient.newCall(request).execute();
                if (response.code()==200){
                    String s = response.body().string();
                    return s;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Gson gson = new Gson();
            Userbean userbean = gson.fromJson(s, Userbean.class);
            List<Userbean.NewslistBean> newslist = userbean.getNewslist();
            //如果下拉刷新就清空大集合
            if (b){
                newslists.clear();
            }
            //停止刷新
            gridView.onRefreshComplete();
            //存放数据
            newslists.addAll(newslist);
            gridView.setAdapter(new Base(OtherActivity.this,newslists));
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.zhonghe.OtherActivity">

    <com.handmark.pulltorefresh.library.PullToRefreshGridView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:numColumns="2"
        android:id="@+id/Grid"
        >

    </com.handmark.pulltorefresh.library.PullToRefreshGridView>

</LinearLayout>

bulid里面加入

compile 'com.github.userswlwork:pull-to-refresh:1.0.0'