Java 如何在一个活动中使用不同列表的addOnScrollListener

在我的应用程序中，有两种方法

getData

和

getItemsByLabel

。通过改进回调方法，每个项目都得到了不同的列表，我使用了NavigationItemSelected上的导航抽屉方法

onNavigationItemSelected

，这样每当用户单击特定项目时，

RecyclerView

中就会显示不同的列表

问题是我使用了一种方法

addOnScrollListener

来检测

RecyclerView

上任何列表的滚动行为，这会导致显示列表中的项目重叠

因此，出现向下滚动时，主列表中的项目与所选类别/项目的列表重叠

这是我的密码

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

    Fabric.with(this, new Crashlytics());

    // Crashlytics.logException(new Exception("My first Android non-fatal error"));
    // I'm also creating a log message, which we'll look at in more detail later
    // Crashlytics.log("MainActivity started");

    swipeRefreshLayout = findViewById(R.id.swipeRefreshLayout);
    recyclerView = findViewById(R.id.recyclerView);
    manager = new LinearLayoutManager(this);
    emptyView = (TextView) findViewById(R.id.empty_view);
    progressBar = findViewById(R.id.spin_kit);
    adapter = new PostAdapter(this, items);
    recyclerView.setLayoutManager(manager);
    recyclerView.setAdapter(adapter);
    toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayShowTitleEnabled(false);
    toolbar.setTitle(R.string.home);

    DrawerLayout drawer = findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();
    NavigationView navigationView = findViewById(R.id.nav_view);
    navigationView.getMenu().getItem(0).setChecked(true);
    navigationView.setNavigationItemSelectedListener(this);
    swipeRefreshLayout.setColorSchemeColors(getResources().getColor(R.color.colorPrimaryGreen));
    swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            if (navigationView.getMenu().getItem(0).isChecked()) {
                if (Utils.hasNetworkAccess(MainActivity.this)) {
                    getData();
                } else {
                    Toast.makeText
                            (MainActivity.this, "You must connect to the Internet to update the list"
                                    , Toast.LENGTH_LONG).show();
                }
            } else {
                for (int i = 1; i < 7; i++) {
                    if (navigationView.getMenu().getItem(i).isChecked()) {
                        getItemsByLabel(navigationView.getMenu().getItem(i).getTitle().toString());
                    }
                }
            }

            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    swipeRefreshLayout.setRefreshing(false);
                }
            }, 3000);
        }

    });

    recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);
            if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
                isScrolling = true;
                if (!recyclerView.canScrollVertically(1)) {
                    progressBar.setVisibility(View.GONE);
                }
            }
        }

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            if (dy > 0) {
                currentItems = manager.getChildCount();
                totalItems = manager.getItemCount();
                scrollOutItems = manager.findFirstVisibleItemPosition();
                if (isScrolling && (currentItems + scrollOutItems == totalItems)) {
                    isScrolling = false;
                    getData(); // This is where I call getData <--
                }
            }
        }
    });

    if (Utils.hasNetworkAccess(this)) {
        getData();
    } else {
        if (runtimeExceptionDaoItems == null || runtimeExceptionDaoItems.queryForAll().isEmpty()) {
            Toast.makeText(this, "There's no data", Toast.LENGTH_LONG).show();
        } else {
            items.addAll(runtimeExceptionDaoItems.queryForAll());
            Toast.makeText(this, "From Database", Toast.LENGTH_LONG).show();
        }
    }
}

long lastPress;
Toast backpressToast;

@Override
public void onBackPressed() {
    DrawerLayout drawer = findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        long currentTime = System.currentTimeMillis();
        if (currentTime - lastPress > 5000) {
            backpressToast = Toast.makeText(getBaseContext(), "Press back again to exit", Toast.LENGTH_LONG);
            backpressToast.show();
            lastPress = currentTime;
        } else {
            if (backpressToast != null) backpressToast.cancel();
            super.onBackPressed();
        }
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    SearchManager searchManager = (SearchManager) getSystemService(SEARCH_SERVICE);
    SearchView searchView = (SearchView) menu.findItem(R.id.app_bar_search).getActionView();
    searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
    searchView.setQueryHint(getResources().getString(R.string.searchForPosts));
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String keyword) {
            getItemsBySearch(keyword);
            return false;
        }

        @Override
        public boolean onQueryTextChange(String keyword) {
            return false;
        }
    });

    searchView.setOnCloseListener(() -> {
        emptyView.setVisibility(View.GONE);
        recyclerView.setVisibility(View.VISIBLE);
        getData();
        return false;
    });

    return true;
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    // Handle navigation view item clicks here.

    switch (item.getItemId()) {
        case R.id.home:
            getData();
            break;
        case R.id.accessory:
            toolbar.setTitle(R.string.accessory);
            getItemsByLabel("Accessory");
            break;
        case R.id.arcade:
            toolbar.setTitle(R.string.arcade);
            getItemsByLabel("Arcade");
            break;
        case R.id.fashion:
            toolbar.setTitle(R.string.fashion);
            getItemsByLabel("Fashion");
            break;
        case R.id.food:
            toolbar.setTitle(R.string.food);
            getItemsByLabel("Food");
            break;
        case R.id.heath:
            toolbar.setTitle(R.string.heath);
            getItemsByLabel("Heath");
            break;
        case R.id.lifeStyle:
            toolbar.setTitle(R.string.lifestyle);
            getItemsByLabel("Lifestyle");
            break;
        case R.id.sports:
            toolbar.setTitle(R.string.sports);
            getItemsByLabel("Sports");
            break;
        case R.id.settings:
            break;
    }

    DrawerLayout drawer = findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

private void getData() {
    progressBar.setVisibility(View.VISIBLE);
    String url = BloggerAPI.BASE_URL + "?key=" + BloggerAPI.KEY;

    if (token != "") {
        url = url + "&pageToken=" + token;
    }
    if (token == null) {
        return;
    }

    final Call<PostList> postList = BloggerAPI.getService().getPostList(url);
    postList.enqueue(new Callback<PostList>() {
        @Override
        public void onResponse(@NonNull Call<PostList> call, @NonNull Response<PostList> response) {
            if (response.isSuccessful()) {
                progressBar.setVisibility(View.GONE);
                PostList list = response.body();
                if (list != null) {
                    token = list.getNextPageToken();
                    items.addAll(list.getItems());
                    adapter.notifyDataSetChanged();
            } else {
                progressBar.setVisibility(View.GONE);
                recyclerView.setVisibility(View.GONE);
                emptyView.setVisibility(View.VISIBLE);

                int sc = response.code();
                switch (sc) {
                    case 400:
                        Log.e("Error 400", "Bad Request");
                        break;
                    case 404:
                        Log.e("Error 404", "Not Found");
                        break;
                    default:
                        Log.e("Error", "Generic Error");
                }
            }
        }

        @Override
        public void onFailure(@NonNull Call<PostList> call, @NonNull Throwable t) {
            Toast.makeText(MainActivity.this, "Error occured", Toast.LENGTH_LONG).show();
            Log.e(TAG, "onFailure: " + t.toString());
            Log.e(TAG, "onFailure: " + t.getCause());
            progressBar.setVisibility(View.GONE);
            recyclerView.setVisibility(View.GONE);
            emptyView.setVisibility(View.VISIBLE);
        }
    });
}

//=============================================================================================

public void getItemsByLabel(String label) {
    progressBar.setVisibility(View.VISIBLE);
    String url = BloggerAPI.BASE_URL + "search?q=label:" + label + "&key=" + BloggerAPI.KEY;

    Log.e("Label :", url);

    if (token != "") {
        url = url + "&pageToken=" + token;
    }
    if (token == null) {
        return;
    }

    final Call<PostList> postList = BloggerAPI.getService().getPostList(url);
    postList.enqueue(new Callback<PostList>() {
        @Override
        public void onResponse(@NonNull Call<PostList> call, @NonNull Response<PostList> response) {
            if (response.isSuccessful()) {
                progressBar.setVisibility(View.GONE);
                items.clear();
                recyclerView.swapAdapter(adapter, false);
                PostList list = response.body();
                if (list != null) {
                    token = list.getNextPageToken();
                    items.addAll(list.getItems());
                    adapter.notifyDataSetChanged();
                }
            } else {
                progressBar.setVisibility(View.GONE);
                recyclerView.setVisibility(View.GONE);
                emptyView.setVisibility(View.VISIBLE);
                int sc = response.code();
                switch (sc) {
                    case 400:
                        Log.e("Error 400", "Bad Request");
                        break;
                    case 404:
                        Log.e("Error 404", "Not Found");
                        break;
                    default:
                        Log.e("Error", "Generic Error");
                }
            }
        }

        @Override
        public void onFailure(@NonNull Call<PostList> call, @NonNull Throwable t) {
            Toast.makeText(MainActivity.this, "Error occured", Toast.LENGTH_LONG).show();
            Log.e(TAG, "onFailure: " + t.toString());
            Log.e(TAG, "onFailure: " + t.getCause());
            progressBar.setVisibility(View.GONE);
            recyclerView.setVisibility(View.GONE);
            emptyView.setVisibility(View.VISIBLE);
        }
    });
}

@覆盖
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
Fabric.with（this，newcrashlytics（））；
//logException（新的异常（“我的第一个Android非致命错误”）；
//我还创建了一个日志消息，稍后我们将更详细地了解它
//Crashlytics.log（“主活动已启动”）；
swipeRefreshLayout=findViewById（R.id.swipeRefreshLayout）；
recyclerView=findViewById（R.id.recyclerView）；
经理=新的LinearLayoutManager（本）；
emptyView=（TextView）findViewById（R.id.empty\u视图）；
progressBar=findViewById（R.id.spin_套件）；
适配器=新的PostAdapter（此，项）；
recyclerView.setLayoutManager（管理器）；
recyclerView.setAdapter（适配器）；
toolbar=findviewbyd（R.id.toolbar）；
设置支持操作栏（工具栏）；
getSupportActionBar（）.setDisplayShowTitleEnabled（false）；
toolbar.setTitle（R.string.home）；
抽屉布局抽屉=findViewById（R.id.抽屉布局）；
ActionBarDrawerToggle切换=新建ActionBarDrawerToggle(
这，抽屉，工具栏，R.string.navigation\u drawer\u open，R.string.navigation\u drawer\u close）；
抽屉。添加抽屉链接器（切换）；
toggle.syncState（）；
NavigationView NavigationView=findViewById（R.id.nav_视图）；
navigationView.getMenu（）.getItem（0）.setChecked（true）；
navigationView.setNavigationItemSelectedListener（此）；
swipeRefreshLayout.setColorSchemeColors（getResources（）.getColor（R.color.colorPrimaryGreen））；
swipeRefreshLayout.setOnRefreshListener（新的swipeRefreshLayout.OnRefreshListener（））{
@凌驾
公共void onRefresh（）{
if（navigationView.getMenu（）.getItem（0.isChecked（））{
if（Utils.hasNetworkAccess（MainActivity.this））{
getData（）；
}否则{
Toast.makeText
（MainActivity.this，“您必须连接到Internet才能更新列表”
，Toast.LENGTH_LONG）show（）；
}
}否则{
对于（int i=1；i<7；i++）{
if（navigationView.getMenu（）.getItem（i）.isChecked（））{
getItemsByLabel（navigationView.getMenu（）.getItem（i.getTitle（）.toString（））；
}
}
}
new Handler（）.postDelayed（new Runnable（））{
@凌驾
公开募捐{
swipeRefreshLayout.setRefreshing（false）；
}
}, 3000);
}
});
recyclerView.addOnScrollListener（新的recyclerView.OnScrollListener（）{
@凌驾
CrollStateChanged上的公共无效（RecyclerView RecyclerView，int newState）{
super.onScrollStateChanged（recyclerView、newState）；
if（newState==AbsListView.OnScrollListener.SCROLL\u STATE\u TOUCH\u SCROLL）{
isScrolling=true；
如果（！recyclerView.CanScrollVertical（1））{
progressBar.setVisibility（View.GONE）；
}
}
}
@凌驾
已填空的公共空间（RecyclerView RecyclerView、int dx、int dy）{
super.onScrolled（recyclerView、dx、dy）；
如果（dy>0）{
currentItems=manager.getChildCount（）；
totalItems=manager.getItemCount（）；
scrollOutItems=manager.findFirstVisibleItemPosition（）；
if（isScrolling&&（currentItems+scrollOutItems==totalItems））{
IsCrolling=假；
getData（）；//这是我调用getData 5000的地方）{
backpressToast=Toast.makeText（getBaseContext（），“再次按back退出”，Toast.LENGTH\u LONG）；
backpressToast.show（）；
lastPress=当前时间；
}否则{
如果（backpressToast！=null）backpressToast.cancel（）；
super.onBackPressed（）；
}
}
}
@凌驾
公共布尔onCreateOptions菜单（菜单）{
//为菜单充气；这会将项目添加到操作栏（如果存在）。
getMenuInflater（）.充气（R.menu.main，menu）；
SearchManager SearchManager=（SearchManager）getSystemService（搜索服务）；
SearchView SearchView=（SearchView）菜单.findItem（R.id.app_bar_search）.getActionView（）；
searchView.setSearchableInfo（searchManager.getSearchableInfo（getComponentName（））；
setQueryHint（getResources（）.getString（R.string.searchForPosts））；
searchView.setOnQueryTextListener（新的searchView.OnQueryTextListener（）{
@凌驾
公共布尔值onQueryTextSubmit（字符串关键字）{
getItemsBySearch（关键字）；
返回false；
}
@凌驾
公共布尔值onQueryTextChange（字符串关键字）{
返回false；
}
});
searchView.setOnCloseListener（（）->{
emptyView.setVisibility（View.GONE）；
recyclerView.setVisibility（View.VISIBLE）；
getData（）；
返回false；
});
返回true；
}
@SuppressWarnings（“StatementWithEmptyBody”）
@凌驾
公共布尔值onNavigationItemSelected（@NonNull Me
private boolean getItemsByLabelCalled = false; 

private void getData() {
    if(getItemsByLabelCalled) return;

    // Other statements are the same as before
}

public void getItemsByLabel(String label) {

    // Here is the change
    if(getItemsByLabelCalled) return; 
    else getItemsByLabelCalled = true;

    progressBar.setVisibility(View.VISIBLE);
    String url = BloggerAPI.BASE_URL + "search?q=label:" + label + "&key=" + BloggerAPI.KEY;

    Log.e("Label :", url);

    if (token != "") {
        url = url + "&pageToken=" + token;
    }
    if (token == null) {
        return;
    }

    final Call<PostList> postList = BloggerAPI.getService().getPostList(url);
    postList.enqueue(new Callback<PostList>() {
        @Override
        public void onResponse(@NonNull Call<PostList> call, @NonNull Response<PostList> response) {
            if (response.isSuccessful()) {
                progressBar.setVisibility(View.GONE);
                items.clear();
                recyclerView.swapAdapter(adapter, false);
                PostList list = response.body();
                if (list != null) {
                    token = list.getNextPageToken();
                    items.addAll(list.getItems());
                    adapter.notifyDataSetChanged();
                }

                // Reset again here
                getItemsByLabelCalled = false;
            } else {
                // Reset again here
                getItemsByLabelCalled = false;

                progressBar.setVisibility(View.GONE);
                recyclerView.setVisibility(View.GONE);
                emptyView.setVisibility(View.VISIBLE);
                int sc = response.code();
                switch (sc) {
                    case 400:
                        Log.e("Error 400", "Bad Request");
                        break;
                    case 404:
                        Log.e("Error 404", "Not Found");
                        break;
                    default:
                        Log.e("Error", "Generic Error");
                }
            }
        }

        @Override
        public void onFailure(@NonNull Call<PostList> call, @NonNull Throwable t) {
            Toast.makeText(MainActivity.this, "Error occured", Toast.LENGTH_LONG).show();
            Log.e(TAG, "onFailure: " + t.toString());
            Log.e(TAG, "onFailure: " + t.getCause());
            progressBar.setVisibility(View.GONE);
            recyclerView.setVisibility(View.GONE);
            emptyView.setVisibility(View.VISIBLE);

            // Reset again here
            getItemsByLabelCalled = false;
        }
    });
}

    protected void getRefreshView() {
    int childs = getChildCount();
    if (childs > 0) {
        View childView = getChildAt(0);
        if (childView instanceof RecyclerView) {
            mRecyclerView = (RecyclerView) childView;
            mRecyclerView.setOnScrollListener(mScrollListener);
            mRecyclerView.setOnScrollListener(new OnScrollListener() {
            });
        }
    }
}