Android 如何在活动中处理RecyclerView外部的开关小部件（或按钮）

我用带有cardview的recyclerview加载数据，有两列，代码工作正常，但我需要用switch小部件隐藏第一列。我尝试了一些代码，但没有一个适合我。有人能帮我吗。我是android新手。谢谢

这是截图

下面是我的代码

MyFragment.java

public class MyFragment extends Fragment {

    public MyFragment() {

    }

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup viewGroup,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_recyclerview, viewGroup, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mobile = getResources().getStringArray(R.array.mobile);
        desktop = getResources().getStringArray(R.array.desktop);

        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

        MyAdapter adapter = new MyAdapter(getContext());
        recyclerView.setAdapter(adapter);

        // this code below didn't work. i thought it's because different 
        // layout between fragment and adapter but i don't know to solve it
        final TextView tvMobile = (TextView) view.findViewById(R.id.tv_mobile);
        Switch mSwitch = (Switch) view.findViewById(R.id.switch_item);
        mSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    tvMobile.setVisibility(View.GONE);
                } else {
                    tvMobile.setVisibility(View.VISIBLE);
                }
            }
        });
    }
}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    private LayoutInflater inflater;

    public static String[] mobile;
    public static String[] desktop;

    public MyAdapter(Context context) {
        inflater = LayoutInflater.from(context);
    }

    @NonNull
    @Override
    public MyAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.item_cardview, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyAdapter.MyViewHolder holder, int position) {
        holder.tvMobile.setText(mobile[position]);
        holder.tvDesktop.setText(desktop[position]);
    }

    @Override
    public int getItemCount() {
        return mobile.length;
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        private TextView tvMobile;
        private TextView tvDesktop;

        MyViewHolder(View itemView) {
            super(itemView);
            tvMobile = (TextView) itemView.findViewById(R.id.tv_mobile);
            tvDesktop = (TextView) itemView.findViewById(R.id.tv_desktop);
        }
    }
}

MyAdapter.java

public class MyFragment extends Fragment {

    public MyFragment() {

    }

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup viewGroup,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_recyclerview, viewGroup, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        mobile = getResources().getStringArray(R.array.mobile);
        desktop = getResources().getStringArray(R.array.desktop);

        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

        MyAdapter adapter = new MyAdapter(getContext());
        recyclerView.setAdapter(adapter);

        // this code below didn't work. i thought it's because different 
        // layout between fragment and adapter but i don't know to solve it
        final TextView tvMobile = (TextView) view.findViewById(R.id.tv_mobile);
        Switch mSwitch = (Switch) view.findViewById(R.id.switch_item);
        mSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    tvMobile.setVisibility(View.GONE);
                } else {
                    tvMobile.setVisibility(View.VISIBLE);
                }
            }
        });
    }
}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    private LayoutInflater inflater;

    public static String[] mobile;
    public static String[] desktop;

    public MyAdapter(Context context) {
        inflater = LayoutInflater.from(context);
    }

    @NonNull
    @Override
    public MyAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.item_cardview, parent, false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull MyAdapter.MyViewHolder holder, int position) {
        holder.tvMobile.setText(mobile[position]);
        holder.tvDesktop.setText(desktop[position]);
    }

    @Override
    public int getItemCount() {
        return mobile.length;
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        private TextView tvMobile;
        private TextView tvDesktop;

        MyViewHolder(View itemView) {
            super(itemView);
            tvMobile = (TextView) itemView.findViewById(R.id.tv_mobile);
            tvDesktop = (TextView) itemView.findViewById(R.id.tv_desktop);
        }
    }
}

公共类MyAdapter扩展了RecyclerView.Adapter{ 私人充气机； 公共静态字符串[]移动； 公共静态字符串[]桌面； 公共MyAdapter（上下文）{ 充气器=充气器。从（上下文）； } @非空 @凌驾 public MyAdapter.MyViewHolder onCreateViewHolder（@NonNull ViewGroup父级，int-viewType）{ 视图=充气机。充气（R.layout.item_cardview，父项，false）； 返回新的MyViewHolder（视图）； } @凌驾 public void onBindViewHolder（@NonNull MyAdapter.MyViewHolder，int位置）{ holder.tvMobile.setText（移动[位置]）； holder.tvDesktop.setText（桌面[位置]）； } @凌驾 public int getItemCount（）{ 返回移动长度； } 类MyViewHolder扩展了RecyclerView.ViewHolder{ 私有文本视图tvMobile； 私人文本视图电视桌面； MyViewHolder（查看项目视图）{ 超级（项目视图）； tvMobile=（TextView）itemView.findviewbyd（R.id.tv\u mobile）； tvDesktop=（TextView）itemView.findViewById（R.id.tv_桌面）； } } } fragment\u recyclerview.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background_light"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="end"
        android:background="#dfe7f2"
        android:gravity="end"
        android:orientation="horizontal"
        android:paddingBottom="5dp"
        android:paddingRight="16dp"
        android:paddingTop="5dp">

        <Switch
            android:id="@+id/switch_item"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="Hide Mobile Row"
            android:textColor="@color/text_color"
            android:textSize="18sp" />
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/color_divider" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:paddingBottom="16dp"
        android:paddingTop="16dp" />
</LinearLayout>

<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/card_view"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_gravity="center"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"
    card_view:cardBackgroundColor="@color/background_dark">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:orientation="horizontal"
        android:weightSum="2">

        <TextView
            android:layout_width="5dp"
            android:layout_height="match_parent"
            android:background="@drawable/bg_card_view" />

        <TextView
            android:id="@+id/tv_mobile"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:paddingLeft="10dp"
            android:text="romaji"
            android:textColor="@color/black_1"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/tv_desktop"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:paddingLeft="10dp"
            android:text="arti"
            android:textColor="@color/black_1"
            android:textSize="16sp" />
    </LinearLayout>
</android.support.v7.widget.CardView>

item_cardwiew.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background_light"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="end"
        android:background="#dfe7f2"
        android:gravity="end"
        android:orientation="horizontal"
        android:paddingBottom="5dp"
        android:paddingRight="16dp"
        android:paddingTop="5dp">

        <Switch
            android:id="@+id/switch_item"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="Hide Mobile Row"
            android:textColor="@color/text_color"
            android:textSize="18sp" />
    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/color_divider" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:paddingBottom="16dp"
        android:paddingTop="16dp" />
</LinearLayout>

<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:id="@+id/card_view"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_gravity="center"
    android:layout_marginBottom="8dp"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"
    card_view:cardBackgroundColor="@color/background_dark">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:orientation="horizontal"
        android:weightSum="2">

        <TextView
            android:layout_width="5dp"
            android:layout_height="match_parent"
            android:background="@drawable/bg_card_view" />

        <TextView
            android:id="@+id/tv_mobile"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:paddingLeft="10dp"
            android:text="romaji"
            android:textColor="@color/black_1"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/tv_desktop"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:paddingLeft="10dp"
            android:text="arti"
            android:textColor="@color/black_1"
            android:textSize="16sp" />
    </LinearLayout>
</android.support.v7.widget.CardView>

---

在您的适配器中更改如下

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

public static boolean isMobileHided = false; //add this flag

@Override
public void onBindViewHolder(@NonNull MyAdapter.MyViewHolder holder, int position) {
    holder.tvMobile.setText(mobile[position]);
    holder.tvDesktop.setText(desktop[position]);
    if (isMobileHided) {
        holder.tvMobile.setVisblity(View.GONE);
    }
    else{
        holder.tvMobile.setVisblity(View.VISIBLE);
    }
}
}

---

工作，先生，谢谢。因此，每次更改ViewHolder都应该使用这个方法notifyDataSetChanged（）。是的，我们需要为每次更新使用notifyDataSetChanged（）。如果答案是否定的，请在答案上打勾works@RanjithKumar谢谢你，老兄，你救了我这么多头痛！哈哈D