Listview自定义适配器多项选择选择

Question

我正在尝试制作一个 multiple_choice ListView。
我正在使用自定义适配器和自定义布局。
但我没能做到。

活动（片段）：

public class RegisterGroupFragment extends Fragment {
@Override
public void onViewCreated(View view, Bundle savedInstanceState){
    super.onViewCreated(view, savedInstanceState);
    GroupRepository.getInstance(getActivity().getApplication()).getGroups().observe(getActivity(), new Observer<ArrayList<Group>>() {
        @Override
        public void onChanged(ArrayList<Group> groups) {
            populateList(groups,view);
        }
    });
}
private void populateList(ArrayList<Group> groups,View view){
    ArrayList<NormalListModel> models = new ArrayList<>();
    for(int i=0;i<groups.size();i++){
        Group gp = groups.get(i);
        models.add(gp);
    }
    NormalListAdapter listAdapter = new NormalListAdapter(this.getActivity(),R.layout.fragment_normal_checked_task_list_row, models);
    ListView listView = (ListView) view.findViewById(R.id.groups_listview);
    listView.setAdapter(listAdapter);

    listView.setItemsCanFocus(false);
    listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    //listView.setItemChecked(2,true);
    listView.setMultiChoiceModeListener(new ListView.MultiChoiceModeListener() {
        @Override
        public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) {
            mode.setTitle(""+listView.getCheckedItemCount()+" گروه انتخاب شده");
            Log.d("multiple","multiple changed"+listView.getCheckedItemCount());
        }
        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            MenuInflater menuInflater = mode.getMenuInflater();
            menuInflater.inflate(R.menu.menu_contextual_action_bar,menu);
            return true;
        }
        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            return false;
        }
        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            switch (item.getItemId()){
                case R.id.menu_confirm:
                //action on clicking contextual action bar menu item

                    SparseBooleanArray checkedItems = listView.getCheckedItemPositions();
                    for(int i =0;i<checkedItems.size();i++){

                        if(checkedItems.valueAt(i) == true){
                        }
                    }
                    mode.finish();
            }
            return true;
        }
        @Override
        public void onDestroyActionMode(ActionMode mode) {
        }
    });

    //for page #2
    /*listAdapter.setOnItemClickListener(new NormalListAdapter.OnItemClickListener() {
        @Override
        public void onItemClick(View view, int id) {
            //((RegisterActivity) RegisterGroupFragment.this.getActivity()).usrGroupSet(id);
            ArrayList<Integer> arr = new ArrayList<>();
            arr.add(id);
            registerViewModel.setGroupId(arr);
        }
    });*/
}
}

这是 NormalListAdapter：

public class NormalListAdapter extends ArrayAdapter {
//to reference the Activity
private final Activity context;

private ArrayList<NormalListModel> models;

private OnItemClickListener onItemClickListener;

public interface OnItemClickListener {
    void onItemClick(View view, int id);
}

public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
    this.onItemClickListener = onItemClickListener;
}

public NormalListAdapter(Activity context, ArrayList<NormalListModel> models){

    super(context, R.layout.fragment_normal_task_list_row, models);

    this.context=context;
    this.models = models;
}

public NormalListAdapter(Activity context,int layout, ArrayList<NormalListModel> models){

    super(context, layout, models);
    this.context=context;
    this.models = models;
}

public View getView(final int position, View view, ViewGroup parent) {
    LayoutInflater inflater=context.getLayoutInflater();
    View rowView=inflater.inflate(R.layout.fragment_normal_task_list_row, null,true);

    //this code gets references to objects in the listview_row.xml file
    TextView nameTextField = (TextView) rowView.findViewById(R.id.list_item_text_title);
    TextView infoTextField = (TextView) rowView.findViewById(R.id.list_item_text_info);
    ImageView imageView = (ImageView) rowView.findViewById(R.id.list_item_image);

    //this code sets the values of the objects to values from the arrays
    final NormalListModel model = models.get(position);

    nameTextField.setText(model.getTitle());
    infoTextField.setText(model.getInfo());
    if(model.is_local_img()){
        imageView.setImageResource(model.getImage());
    }else{
        Glide.with(parent)
                .load(model.getImageUrl())
                .diskCacheStrategy(DiskCacheStrategy.RESOURCE)
                .error(Glide.with(parent).load(R.drawable.fallback512).fitCenter().dontAnimate())
                .into(imageView);
    }

    //to every row listener, we will call a function
    // function has been initialized when adapter has been made
    if (onItemClickListener != null) {
        rowView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(final View v) {
                    onItemClickListener.onItemClick(v, model.getId());
            }
        });
    }
    return rowView;
}
}

这是自定义布局：

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layoutDirection="rtl"
    >
    <ImageView
        android:layout_width="@dimen/finger"
        android:layout_height="@dimen/finger"
        android:id="@+id/list_item_image"
        android:src="@drawable/ic_auth_confirm"
        android:layout_marginEnd="@dimen/text_title"
        />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/list_item_text_title"
            android:textSize="18sp"
            android:gravity="center_vertical"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/list_item_text_info"
            android:textSize="12sp"
            />
    </LinearLayout>
    <CheckedTextView
        android:id="@+id/text3"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:checkMark="?android:attr/listChoiceIndicatorSingle" />

    </LinearLayout>

这是在操作栏中显示的菜单：

    <?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <item
        android:id="@+id/menu_confirm"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="Delete"
        android:icon="@android:drawable/ic_menu_send"
        tools:ignore="AppCompatResource" />
</menu>

ListView 已正确显示，但 multiple_choice 不起作用。 我不知道我错过了什么？？！

Answer 1

创建一个列表

List<NormalListModel> selectedModel 

在您的getView()方法中。 每次用户点击列表视图的一个项目时，通过下面的方法将该项目添加到此列表中，并确保检查用户是否再次选择了所选项目，将其从 selectedModel 列表中删除。

rowView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(final View v) {
         if (selectedModel != null && selectedModel.contains(model) {
             selectedModel.remove(model);
         }
         else {
             selectedModel.add(model);
         }
    }
});