RecycleView网络请求瀑布流

最新推荐文章于 2024-04-28 19:08:07 发布

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#RecycleView网络请求瀑布流

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本文详细介绍了如何在Android应用中使用RecyclerView实现动态加载数据并展示。通过具体的代码示例，展示了RecyclerView的依赖导入、布局设置、适配器创建及数据绑定过程。

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1，导依赖

implementation 'com.android.support:recyclerview-v7:28.0.0'

2，布局文件

<android.support.v7.widget.RecyclerView
    android:id="@+id/recy"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>

3，MainActivity

public class MainActivity extends AppCompatActivity {

    private RecyclerView recy;
    private String murl="http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
    private TextView tv;
    private List<result.DataBean> data=new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recy = findViewById(R.id.recy);
        asyncSend();
        MyAdapter adapter=new MyAdapter(data,MainActivity.this);
        recy.setAdapter(adapter);
        StaggeredGridLayoutManager staggeredGridLayoutManager=new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
        recy.setLayoutManager(staggeredGridLayoutManager);
        recy.setItemAnimator(new DefaultItemAnimator());


    }


   private void asyncSend() {
       OkHttpClient okHttpClient=new OkHttpClient();
        final Request request=new Request.Builder().url(murl).build();
        Call call = okHttpClient.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Toast.makeText(MainActivity.this,"错误",Toast.LENGTH_LONG).show();
            }
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                final String string = response.body().string();

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Gson gson=new Gson();
                        result result = gson.fromJson(string, result.class);
                        data.addAll(result.getData());
                    }
                });
            }
        });
    }

4，适配器

  public class MyAdapter extends Recycler

View.Adapter<MyAdapter.ViewHolder> {
    private List<result.DataBean> data;
    private Context context;
    public MyAdapter(List<result.DataBean> data, Context context) {
        this.data = data;
        this.context = context;
    }
    @NonNull
    @Override
    public MyAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view=LayoutInflater.from(context).inflate(R.layout.recy_item,viewGroup,false);
        ViewHolder holder=new ViewHolder(view);
         return holder;
    }
    @Override
    public void onBindViewHolder(@NonNull MyAdapter.ViewHolder viewHolder, int i) {
        result.DataBean dataBean = data.get(i);
        ViewGroup.LayoutParams layoutParams = viewHolder.itemView.getLayoutParams();
        Random random=new Random();
        int height=random.nextInt(300)+300;
        layoutParams.height=height;
        viewHolder.itemView.setLayoutParams(layoutParams);
        Glide.with(context).load(data.get(i).getPic_url()).into(viewHolder.img);
    }
    @Override
    public int getItemCount() {
        return data.size();
    }
    public class ViewHolder extends RecyclerView.ViewHolder {

        private final ImageView img;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            img = itemView.findViewById(R.id.img);
        }
    }
}