底部有demo 地址***************************

需要提前知道一些只是

RecyclerView.SCROLL_STATE_IDLE 是RecyclerView 滑動停止狀態

findFirstVisibleItemPosition 可見界面第一個item 的position

smoothScrollToPosition(0) 滑動到頂部

下面看下代碼

public class RecyActivity extends AppCompatActivity{private RecyclerView recyclerView;RecyclerViewAdapter adapter;List<String> list = new ArrayList<>();private TextView back_txt;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.recy_activity_layout);back_txt = findViewById(R.id.back_txt);recyclerView = findViewById(R.id.recy);for (int i=0;i<30;i++){list.add("");}recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));adapter = new RecyclerViewAdapter(this,R.layout.recy_item_layout,list);recyclerView.setAdapter(adapter);recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {@Overridepublic void onScrollStateChanged(@NonNull final RecyclerView recyclerView, int newState) {super.onScrollStateChanged(recyclerView, newState);//獲得recyclerView的線性布局管理器LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager();int firstVisibleItemPosition = manager.findFirstVisibleItemPosition();Log.i("------first", String.valueOf(firstVisibleItemPosition));//判斷不滑動的情況if (newState ==RecyclerView.SCROLL_STATE_IDLE){// 判斷是否滾動超過一屏if (firstVisibleItemPosition ==0){  //沒有超過一屏幕//這里隱藏是為了滑動之后顯示了,在手動滑動到首頁了,就隱藏back_txt.setVisibility(View.GONE);}else{back_txt.setVisibility(View.VISIBLE);back_txt.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {recyclerView.smoothScrollToPosition(0);
//                                recyclerView.scrollToPosition(0);back_txt.setVisibility(View.GONE);}});}}}});}
}

?

demo 參考地址

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