Question

我正在试图弄清楚如何实现

的相同效果

mListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

在RecyclerView实现中。请帮忙。

Answer 1

对RecyclerView的“选择模式”结构没有内置支持。您可以选择自行滚动或使用提供它的第三方库。 DynamicRecyclerView library提供了选择模式，但我还没试过。

This sample app演示了自己实现它，在这种情况下使用激活状态来指示哪个是当前选择。整体模式是：

让RecyclerView.ViewHolder检测到一个表明选择的UI操作（点击一行？点击行中的RadioButton等等。）
跟踪RecyclerView.Adapter级别的选择。在我的情况下，ChoiceCapableAdapter会与实施SingleChoiceMode策略的ChoiceMode类一起处理。
进行选择时，更新新选择的行以反映选项和更新先前选择的行以反映不再选择它。 findViewHolderForPosition()上的RecyclerView可以在此处提供帮助 - 如果您跟踪最后一个选项的position，findViewHolderForPosition()可以为您提供ViewHolder选项，那么您可以“取消选择”它。
通过将其置于管理RecyclerView的活动或片段的已保存实例状态，跟踪配置更改的选择。

Answer 2

我为这种应用于RecyclerView的选择模式创建了一个库，也许它可以提供帮助：

描述

创建此库是为了帮助将多项选择集成到RecyclerView

实施

与Gradle的集成非常简单，您只需要jcenter存储库和库：

repositories {
    jcenter()
}
...

dependencies {
    compile 'com.davidecirillo.multichoicerecyclerview:multichoicerecyclerview:1.0.1'
}

使用的主要步骤

将MultiChoiceRecyclerView添加到xml文件

<com.davidecirillo.multichoicesample.MultiChoiceRecyclerView
    android:id="@+id/multiChoiceRecyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

提供对象并连接视图

MultiChoiceRecyclerView mMultiChoiceRecyclerView = (MultiChoiceRecyclerView) findViewById(R.id.multiChoiceRecyclerView);

将适配器扩展到MultiChoiceAdapter并按正常用法将其添加到RecyclerView

public class MyAdapter extends MultiChoiceAdapter<MyViewHolder> {

    public MyAdapter(ArrayList<String> stringList, Context context) {
        this.mList = stringList;
        this.mContext = context;
    }

    ...
} 

MyAdapter myAdapter = new MyAdapter(mList, getApplicationContext());
mMultiChoiceRecyclerView.setAdapter(myAdapter);

有关更多信息和自定义： https://github.com/dvdciri/MultiChoiceRecyclerView

Answer 3

你可以这样说：

- 数据（字符串名称，选择布尔值）

- 带有itemClickListener的适配器

- 活动或片段

- activity_main（recyclerView）

- list_item（TextView，CheckBox）

数据

public class MultipleData {

    private String mTitle;
    private boolean mBoolean;

    public MultipleData(String title, boolean mBoolean) {
        this.mTitle = title;
        this.mBoolean = mBoolean;
    }

    public String getTitle() {
        return mTitle;
    }

    public void setTitle(String mTitle) {
        this.mTitle = mTitle;
    }

    public boolean isBoolean() {
        return mBoolean;
    }

    public void setBoolean(boolean mBoolean) {
        this.mBoolean = mBoolean;
    }
}

您的观点activity_main.xml（recyclerView）

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.thedeveloperworldisyours.fullrecycleview.multiple.MultipleFragment">

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

</FrameLayout>

和list_item.xml（TextView，CheckBox）

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/multiple_list_item_text"
        android:layout_width="match_parent"
        android:layout_height="90dp"
        android:text="@string/app_name"
        android:typeface="monospace"
        android:layout_toLeftOf="@+id/multiple_list_item_check_button"
        android:gravity="center"
        android:textSize="@dimen/multiple_list_item_size_rock_stars"/>

    <RadioButton
        android:id="@+id/multiple_list_item_check_button"
        android:layout_width="wrap_content"
        android:layout_height="90dp"
        android:layout_alignParentRight="true"
        android:checked="false"
        android:clickable="false"
        android:focusable="false" />

</RelativeLayout>

使用ClickListener

的适配器

public class MultipleRecyclerViewAdapter extends RecyclerView
        .Adapter<MultipleRecyclerViewAdapter
        .DataObjectHolder> {

    private List<MultipleData> mList;
    private static MultipleClickListener sClickListener;

    MultipleRecyclerViewAdapter(List<MultipleData> mList) {
        this.mList = mList;
    }

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

        TextView mTextView;
        RadioButton mRadioButton;

         DataObjectHolder(View itemView) {
            super(itemView);
            mTextView = (TextView) itemView.findViewById(R.id.multiple_list_item_text);
            mRadioButton = (RadioButton) itemView.findViewById(R.id.multiple_list_item_check_button);
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            sClickListener.onItemClick(getAdapterPosition(), v);
        }
    }

    void changedData(int position) {
            if (mList.get(position).isBoolean()) {
                mList.get(position).setBoolean(false);
            } else {
                mList.get(position).setBoolean(true);
            }
        notifyDataSetChanged();
    }

    void setOnItemClickListener(MultipleClickListener myClickListener) {
        this.sClickListener = myClickListener;
    }

    @Override
    public DataObjectHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.multiple_list_item, parent, false);

        DataObjectHolder dataObjectHolder = new DataObjectHolder(view);
        return dataObjectHolder;
    }

    @Override
    public void onBindViewHolder(DataObjectHolder holder, int position) {
        holder.mTextView.setText(mList.get(position).getTitle());
        holder.mRadioButton.setChecked(mList.get(position).isBoolean());
    }

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

    interface MultipleClickListener {
        void onItemClick(int position, View v);
    }


}

活动或片段

public class MultipleFragment extends Fragment implements MultipleRecyclerViewAdapter.MultipleClickListener{

    MultipleRecyclerViewAdapter mAdapter;

    public MultipleFragment() {
        // Required empty public constructor
    }

    public static MultipleFragment newInstance() {
        return new MultipleFragment();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.multiple_fragment, container, false);

        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.multiple_fragment_recycler_view);

        MultipleData hendrix = new MultipleData("Jimi Hendrix", false);
        MultipleData bowie = new MultipleData("David Bowie", false);
        MultipleData morrison = new MultipleData("Jim Morrison", false);

        MultipleData presley = new MultipleData("Elvis Presley", false);
        MultipleData jagger = new MultipleData("Mick Jagger", false);
        MultipleData cobain = new MultipleData("Kurt Cobain", false);

        MultipleData dylan = new MultipleData("Bob Dylan", false);
        MultipleData lennon = new MultipleData("John Lennon", false);
        MultipleData mercury = new MultipleData("Freddie Mercury", false);

        MultipleData elton = new MultipleData("Elton John", false);
        MultipleData clapton = new MultipleData("Eric Clapton", false);

        List<MultipleData> list = new ArrayList<>();
        list.add(0, hendrix);
        list.add(1, bowie);
        list.add(2, morrison);

        list.add(3, presley);
        list.add(4, jagger);
        list.add(5, cobain);

        list.add(6, dylan);
        list.add(7, lennon);
        list.add(8, mercury);

        list.add(9, elton);
        list.add(10, clapton);

        mAdapter = new MultipleRecyclerViewAdapter(list);
        recyclerView.setAdapter(mAdapter);
        recyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());

        recyclerView.setLayoutManager(layoutManager);
        mAdapter.setOnItemClickListener(this);

        return view;
    }

    @Override
    public void onItemClick(int position, View v) {
        mAdapter.changedData(position);
    }
}

您可以看到this example in GitHub和this post for multiple choice以及this post for single choice快乐代码!!!

RecyclerView中的选择模式？

3 个答案:

描述

实施

使用的主要步骤