小编Yun*_*dar的帖子

我在使用Android支持设计库25时使用BottomNavigationView.但是当我切换选项卡时,其他选项卡的标题正在隐藏.但实际的底部导航视图没有隐藏问题.但我的藏匿.

但我希望它看起来像那样.有没有想过这样做？我错过了什么？

这是我的代码:

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.yunus.ototakip.MainActivity">

<FrameLayout
    android:id="@+id/main_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@+id/bottom_navigation"
    android:layout_alignParentTop="true">
</FrameLayout>

<android.support.design.widget.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    app:itemBackground="@color/colorPrimary"
    app:itemIconTint="@color/beyaz"
    app:itemTextColor="@color/beyaz"
    app:menu="@menu/bottombar_menu" />

bottom_bar_menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
 <item
android:id="@+id/bb_menu_arac"
android:enabled="true"
android:icon="@drawable/icon_car"
android:title="@string/araclarim"
app:showAsAction="ifRoom" />
 <item
android:id="@+id/bb_menu_yakin"
android:enabled="true"
android:icon="@drawable/icon_yer"
android:title="@string/yakinimdakiler"
app:showAsAction="ifRoom" />
  <item
android:id="@+id/bb_menu_yaklasan"
android:enabled="true"
android:icon="@drawable/icon_takvim"
android:title="@string/yaklasanlar"
app:showAsAction="ifRoom" />

<item
    android:id="@+id/bb_menu_ipucu"
    android:enabled="true"
    android:icon="@drawable/icon_ipucu"
    android:title="@string/ipuclari"
    app:showAsAction="ifRoom" />
 </menu>

我在我的应用程序上集成了Bottom Bar导航栏.但是当我滑动时,标签的颜色不会改变.因为我有选择器文件,这很奇怪.有什么想法解决这个问题吗？

Activity.java

BottomNavigationView bottomNavigationView = (BottomNavigationView)
            findViewById(R.id.bottom_navigation);


    bottomNavigationView.setOnNavigationItemSelectedListener(
            new BottomNavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                    switch (item.getItemId()) {
                        case R.id.bb_menu_arac:
                            fragment = new AraclarimFragment();
                            break;
                        case R.id.bb_menu_yaklasan:
                            fragment = new YaklasanlarFragment();
                            break;
                        case R.id.bb_menu_yakin:
                            fragment = new Yakinimdakiler();
                            break;

                    }
                    final FragmentTransaction transaction = fragmentManager.beginTransaction();
                    transaction.replace(R.id.main_container, fragment).commit();
                    return true;
                }


            });

selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="@color/beyaz" android:state_enabled="true" />
<item android:color="@color/colorPrimaryDark" android:state_enabled="false" />
</selector>

activiy.xml

<android.support.design.widget.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    app:itemBackground="@color/colorPrimary"
    app:itemIconTint="@color/beyaz"
    app:itemTextColor="@color/beyaz"
    app:menu="@menu/bottombar_menu" …

我想从我的函数返回一个字符串值.但我不知道如何处理它？我尝试了最终的单阵列解决方案,但它没有成功.

这是我的代码:

public String revealCourtPlace(String courtID)
{

    BaseService.getInstance().getUniqueCourt(Session.getToken(),courtID).enqueue(new Callback<JsonObject>()
    {
        @Override
        public void onResponse(Call<JsonObject> call, Response<JsonObject> response)
        {

            JsonObject object = response.body();
            boolean success = object.get("success").getAsBoolean(); //json objesinde dönen success alan? true ise
            if (success)
            {
                JsonArray resultArray = object.get("data").getAsJsonObject().get("result").getAsJsonArray();
                for (int i = 0; i < resultArray.size(); i++)
                {
                    JsonObject jsonInfoResult = resultArray.get(i).getAsJsonObject();
                    String courtName=jsonInfoResult.get("name").getAsString();
                }

            }

        }

        @Override
        public void onFailure(Call<JsonObject> call, Throwable t)
        {

        }

    });

    //return ?
}

我想从Firebase数据库中提取数据.我的表名是"cardornek".我设置了读/写权限.

但我得到这个"java.util.ArrayList.size()"对空对象引用"错误.任何的想法？

RecyclerViewAdapter.java

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {

private ArrayList<String> values=null;
RecyclerViewAdapter(ArrayList<String> values) {
    this.values = values;
}
@Override
public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    return new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_view_item,parent,false));
}


@Override
public void onBindViewHolder(RecyclerViewAdapter.ViewHolder holder, int position)
{
    holder.name.setText(values.get(position));
}

@Override
public int getItemCount() {
    return values.size();
}

public class ViewHolder extends RecyclerView.ViewHolder
{
    private TextView name;
    ViewHolder(View itemView) {
        super(itemView);
        name = (TextView) itemView.findViewById(R.id.list_item_text);
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;

@Override
protected …