如何将OnClickListener设置为RecyclerView中的两个按钮？

Question

在我的Android应用程序中,我有一个活动来显示RecyclerView,其中每行由TextView和2个按钮组成.就像那样:

好吧,经过互联网的许多解释,我已经制作了这个适配器:

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

    private LayoutInflater layoutInflater;
    protected Vector<List> lists;

    public ListAdapter(Context context, Vector lists) {
        layoutInflater = (LayoutInflater) 
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        this.lists = lists;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = layoutInflater.inflate(R.layout.listadapter, null);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        List list = lists.elementAt(position);
        holder.name.setText(list.getName());
        //holder.delete.set HOW DO I GET BUTTON HERE?
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder 
implements View.OnClickListener {
        public TextView name;
        public Button edit;
        public Button delete;

        public ViewHolder(View itemView) {
            super(itemView);
            name = (TextView) itemView.findViewById(R.id.listname);
            edit = (Button) itemView.findViewById(R.id.edit);
            delete = (Button) itemView.findViewById(R.id.delete);

            edit.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            switch (view.getId()) {
                case R.id.edit:
                    break;
                case R.id.delete:
                    break;
                default:
                    break;
            }
        }
    }
}

我没有找到在recyclerview的每个视图中有2个按钮(只有添加图像的例子)的例子,就像在第一张图片中一样.我的意思是,猜测我的RecyclerView中有10个List元素,我怎么能在每一个中都有一个带有List和2个按钮名称的TextView并处理clickListener？.如下图所示,我亲手为你看看我在说什么:

这是将显示recyclerView的活动; 不要把它考虑在内,因为我很确定方法是错的.我从sqlite数据库获取列表信息:

public class ShowListOfLists extends AppCompatActivity {

private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_show_list_of_lists);
    LocalDB localDB = new LocalDB(this, "localBD", null, 1);
    Vector <List> ListAdapter = localDB.getAllPrivateList();

    recyclerView = (RecyclerView) findViewById(R.id.recyclerviewlistas);
    recyclerView.setAdapter(new ListAdapter(this, ListAdapter));
    layoutManager = new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);
}

列表具有以下属性:

-idList int
-name String
-Description String
-creationDate Date
-active int (0 or 1)
-deactivationDate Date

先感谢您.

/*******************************编辑****************************************/

谢谢你我已经能够显示recyclerView并且它运行良好.但我明白了:

而不是:

这是适配器的XML代码和设计:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="60dp"
android:background="@drawable/rectangle_bg"
android:orientation="horizontal"
android:weightSum="1"
android:layout_marginTop="5dp">

<TextView
    android:id="@+id/listname"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="20dp"
    android:layout_weight="0.75"
    android:gravity="center_vertical"
    android:text="TextView"
    android:textSize="15sp"/>

<LinearLayout
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="0.25"
    android:gravity="end"
    android:orientation="vertical">

    <ImageButton
        android:id="@+id/delete"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:background="@android:color/transparent"
        android:contentDescription="Delete"
        app:srcCompat="@android:drawable/ic_menu_delete" />

    <ImageButton
        android:id="@+id/edit"
        android:layout_width="match_parent"
        android:layout_height="30dp"
        android:background="@android:color/transparent"
        android:contentDescription="Edit"
        app:srcCompat="@android:drawable/ic_menu_edit" />

    </LinearLayout>

</LinearLayout>

这是recyclerview的XML

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    tools:context="com.pc.kanayel.runoutof.ShowListOfLists"
    android:orientation="vertical"
    android:id="@+id/recyclerviewlistas">

</android.support.v7.widget.RecyclerView>

Answer 1

您只需要添加一些代码即可ListAdapter.它就在那里,您必须实施onClickListener.您的案例代码应如下所示.

您可以传递所需的任何参数.这取决于您想要实现的功能.这里我演示了传递列表中单击项目的顺序.

选项1(功率/性能效率)

那么,下面的代码究竟意味着什么呢？您已经创建ViewHolder并实现了OnClickListener.那是正确的.现在您需要设置OnClickListener两个按钮.但点击时这些按钮的作用是由interface我们在里面创建的ViewHolder.

当app运行时,RecyclerView将创建尽可能多的ViewHolders,因为它需要通过调用onCreateViewHolder()每个视图的方法来填充可用屏幕和列表项.向上/向下滚动时,这些ViewHolders将被重复使用.OnCreateViewHolder()未调用,仅onBindViewHolder()调用以更新viewholder的内容.下面的代码使得,当创建ViewHolder时,它还将创建一个MyClickListener将由OnClickListenerviewholder 使用,并且当重新使用viewholder时,它将不会创建新的OnClickListener.这意味着我们的方法具有高效性.

选项2(效率不高)

你也可以setOnClickListener()在里面onBindViewHolder().但是,正如我在上面的段落中所提到的,每次滚动以更新viewholder的内容时都会调用此方法.现在它OnClickListener每次都会创建新对象.虽然选项1具有OnClickListener在每个ViewHolder和它重用他们.

选项1的代码

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

    private LayoutInflater layoutInflater;
    protected Vector<List> lists;

    public ListAdapter(Context context, Vector lists) {
        layoutInflater = (LayoutInflater) 
        context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        this.lists = lists;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = layoutInflater.inflate(R.layout.listadapter, null);
        ViewHolder = holder = new ViewHolder(view, new ViewHolder.MyClickListener() {
            @Override
            public void onEdit(int p) {
                // Implement your functionality for onEdit here
            }

            @Override
            public void onDelete(int p) {
                // Implement your functionality for onDelete here
            }
        });
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        List list = lists.elementAt(position);
        holder.name.setText(list.getName());
    }

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

    public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        MyClickListener listener;

        TextView name;
        Button edit;
        Button delete;

        public ViewHolder(View itemView, MyClickListener listener) {
            super(itemView);
            name = (TextView) itemView.findViewById(R.id.listname);
            edit = (Button) itemView.findViewById(R.id.edit);
            delete = (Button) itemView.findViewById(R.id.delete);

            this.listener = listener;

            edit.setOnClickListener(this);
            delete.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            switch (view.getId()) {
                case R.id.edit:
                    listener.onEdit(this.getLayoutPosition());
                    break;
                case R.id.delete:
                    listener.onDelete(this.getLayoutPosition());
                    break;
                default:
                    break;
            }
        }

        public interface MyClickListener {
            void onEdit(int p);
            void onDelete(int p);
        }
    }
}

编辑第二个问题

为了让列表项采取一切宽度设置width你的recyclerview来match_parent.将它作为某种布局的子视图也更好.例如,如下所示.

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.pc.kanayel.runoutof.ShowListOfLists">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerviewlistas"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

<RelativeLayout>

并在适配器内更改此代码:

View view = layoutInflater.inflate(R.layout.listadapter, null);

对此:

View view = layoutInflater.inflate(R.layout.listadapter, parent, false);