Android-RecyclerView如何在回收器视图中准备项目，使其可见？

Question

我的回收视图中有视频，我希望它们在成为visible.So用户之前加载，而不是等待它加载并像instagram那样没有延迟地播放。

有什么方法可以做到这一点吗？

例如：

recyclerView.loadItemsBeforeTheyBecomeVisible(int numberOfLoadingItem);

Answer 1

你需要创建一个异步任务来加载视频，一旦异步任务完成，执行你的方法来设置回收器视图，如下所示

YourActivityClass

      @Override
    protected void onCreate(Bundle savedInstanceState) {
         ..........
       YourASynctask yourasynctask = new YourASynctask (pass params if it's necessary);
       yourasynctask.execute();
}

在你的异步任务中

public class YourAsynctaskextends AsyncTask<Void,Void,List<ListaLineal>> {

private ProgressDialog progressDialog;

public YourAsynctask() {

}

@Override
protected void onPreExecute() {
    super.onPreExecute();
//show progressdialog
    progressDialog = ProgressDialog.show(activity,"Cargando","Espere por favor...",false,false);

}

@Override
protected < doInBackground(Void... voids) {

   //load video here and return whatever you need to

    return something;
}

@Override
protected void onPostExecute() {
    super.onPostExecute();
    progressDialog.dismiss();
    YourActivityClass.setupData();
}

最后，你需要在你的ActivityClass中留出一个空格来设置rv，比如

public void setupData(){
            yourRV = (RecyclerView) findViewById(R.id.recyclerid);
            yourRV.setLayoutManager(new LinearLayoutManager(this));
            rvAdapter = new CustomAdapter();
    yourRV.setAdapter(rvAdapter);
}