Question

我在这里阅读了很多关于列表视图和复选框的主题。他们中的很多人使用CheckedTextView或扩展它。我想在android邮件应用程序（Gingerbread，ICS）上实现带有复选框行为的自定义列表视图：只有复选框可以检查而不是整行。另外，在ICS上，操作栏指示已检查列表项的数量。

任何人都可以向我展示一些代码或指出我正确的方向吗？谢谢！

Answer 1

在API演示列表16多选模式中查看示例

public class List16 extends ListActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ListView lv = getListView();
    lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
    lv.setMultiChoiceModeListener(new ModeCallback());
    setListAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_activated_1, 
            Cheeses.sCheeseStrings));
}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    getActionBar().setSubtitle("Long press to start selection");
}

private class ModeCallback implements ListView.MultiChoiceModeListener {

    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.list_select_menu, menu);
        mode.setTitle("Select Items");
        return true;
    }

    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        return true;
    }

    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        switch (item.getItemId()) {
        case R.id.share:
            Toast.makeText(List16.this, "Shared " + getListView().
            getCheckedItemCount() +
                    " items", Toast.LENGTH_SHORT).show();
            mode.finish();
            break;
        default:
            Toast.makeText(List16.this, "Clicked " + item.getTitle(),
                    Toast.LENGTH_SHORT).show();
            break;
        }
        return true;
    }

    public void onDestroyActionMode(ActionMode mode) {
    }

    public void onItemCheckedStateChanged(ActionMode mode,
            int position, long id, boolean checked) {
        final int checkedCount = getListView().getCheckedItemCount();
        switch (checkedCount) {
            case 0:
                mode.setSubtitle(null);
                break;
            case 1:
                mode.setSubtitle("One item selected");
                break;
            default:
                mode.setSubtitle("" + checkedCount + " items selected");
                break;
        }
    }

}
}

自定义列表视图，其复选框行为与gmail应用相似

1 个答案: