java - 如果显示recyclerView，如何停止显示加载？

Question

如果显示回收器，我想停止显示进度条

 ProgressBar progressBar = findViewById(R.id.progressbar);
    if (recyclerView.isShown()){
        progressBar.setVisibility(View.GONE);
    }
    else {
        progressBar.setVisibility(View.VISIBLE);
    }

这是我在 android studio 中的 xml

<ProgressBar
    android:id="@+id/progressbar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true" />

 <androidx.recyclerview.widget.RecyclerView
    android:id="@+id/all_user_post_list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/search_posts" />

我希望适配器位于主要 Activity 中，并且适配器将在主要 Activity 中显示，好吧，我猜就是这样

public class MainActivity extends AppCompatActivity {
EditText search;
String currentUserID;
private RecyclerView recyclerView;
private List<Posts> postList;
private AdapterPost adapterPost;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    MultiDex.install(this);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    recyclerView = findViewById(R.id.all_user_post_list);

    LinearLayoutManager layoutManager = new 
    LinearLayoutManager(MainActivity.this);
    layoutManager.setStackFromEnd(true);
    layoutManager.setReverseLayout(true);
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.setHasFixedSize(true);
    postList = new ArrayList<>();

    LoadEveryUsersPosts();

Answer 1

试试这个代码:

    View recyclerview= (RecyclerView) findViewById(R.id.all_user_post_list);
    recyclerview.getViewTreeObserver()
                    .addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                        @Override
                        public void onGlobalLayout() {
                              progressBar.setVisibility(View.GONE);
                              recyclerview.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                        //prevent infinite loop
                                }
                            });