Android GridView多选

我有一个GridView实现并激活了

mGridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE_MODAL);

模式.现在,当我对一个项目执行长按时,我可以从网格中选择多个项目.我希望通过正常的短按实现此行为.这可能吗？

首先,我建议考虑这个用户场景是否是你一直在寻找的.默认情况下,在Android UX中选择您长按的内容,这是用户习惯的模式.所以,也许你应该重新考虑整个流程.

说,你真的需要GridView.CHOICE_MODE_MULTIPLE_MODAL吗？

您可以在适配器级别处理它,只需存储选定的位置并在onClick处理程序中更新此列表:

static final String[] numbers = new String[] {
        "A", "B", "C", "D", "E",....
        "U", "V", "W", "X", "Y", "Z"};

.....

gridView = (GridView) findViewById(R.id.gridView1);
final CustomAdapter adapter = new CustomAdapter(numbers);
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    public void onItemClick(AdapterView parent, View v,
                            int position, long id) {
        int selectedIndex = adapter.selectedPositions.indexOf(position);
        if (selectedIndex > -1) {
            adapter.selectedPositions.remove(selectedIndex);
            ((CustomView)v).display(false);
        } else {
            adapter.selectedPositions.add(position);
            ((CustomView)v).display(true);
        }
    }
});

自定义BaseAdapter显示自定义视图:

public class CustomAdapter extends BaseAdapter {
    private String[] strings;
    List selectedPositions = new ArrayList<>();

    CustomAdapter(String [] strings) {
        this.strings = strings;
    }

    @Override
    public int getCount() {
        return strings.length;
    }

    @Override
    public Object getItem(int position) {
        return strings[position];
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        CustomView customView = (convertView == null) ? 
                                    new CustomView(MainActivity.this) : (CustomView) convertView;
        customView.display(strings[position], selectedPositions.contains(position));
        return customView;
    }
}

自定义视图(在我的情况下 - 使用TextView的单元格).XML:

码:

class CustomView extends FrameLayout {

    TextView textView;

    public CustomView(Context context) {
        super(context);
        LayoutInflater.from(context).inflate(R.layout.custom_view, this);
        textView = (TextView)getRootView().findViewById(R.id.textView);
    }

    public void display(String text, boolean isSelected) {
        textView.setText(text);
        display(isSelected);
    }

    public void display(boolean isSelected) {
        textView.setBackgroundColor(isSelected? Color.RED : Color.LTGRAY);
    }
}