android 拉取刷新recyclerview

Android RecyclerView的下拉刷新实现

xml
    android:id="@+id/fl_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
            android:id="@+id/rv_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
            android:id="@+id/rl_refresh"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="10dp"
        android:visibility="gone">
                    android:id="@+id/iv_arrow"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_arrow_down" />
                    android:id="@+id/progress_bar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/iv_arrow" />
                    android:id="@+id/tv_status"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/progress_bar"
            android:text="@string/pull_to_refresh" />
    

java
RecyclerView recyclerView = findViewById(R.id.rv_list);
RelativeLayout refreshLayout = findViewById(R.id.rl_refresh);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        
        if (!recyclerView.canScrollVertically(-1)) {
            // 当滚动到顶部时，显示下拉刷新布局
            refreshLayout.setVisibility(View.VISIBLE);
        }
    }
});

java
public interface OnRefreshListener {
    void onRefresh();
}
public class MainActivity extends AppCompatActivity implements OnRefreshListener {
    private RecyclerView recyclerView;
    private RelativeLayout refreshLayout;
    private ProgressBar progressBar;
    private TextView statusTextView;
    private boolean isRefreshing = false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclerView = findViewById(R.id.rv_list);
        refreshLayout = findViewById(R.id.rl_refresh);
        progressBar = findViewById(R.id.progress_bar);
        statusTextView = findViewById(R.id.tv_status);
        // 设置下拉刷新监听器
        setOnRefreshListener(this);
    }
    @Override
    public void onRefresh() {
        if (!isRefreshing) {
            isRefreshing = true;
            // 显示刷新状态
            progressBar.setVisibility(View.VISIBLE);
            statusTextView.setText(R.string.refreshing);
            // 模拟刷新操作
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    // 更新RecyclerView的数据
                    // ...
                    // 刷新完成，隐藏刷新布局
                    progressBar.setVisibility(View.GONE);
                    statusTextView.setText(R.string.pull_to_refresh);
                    refreshLayout.setVisibility(View.GONE);
                    isRefreshing = false;
                }
            }, 2000); // 2秒后执行刷新操作
        }
    }
}