Android-以编程方式选择GridView的项目？

Question

我想在setAdapter()方法后点击一个项目.

考虑一下,如果您已在Activity中声明并初始化了一个Button,那么您可以从该活动的任何范围以编程方式对其执行单击,并且侦听器将起作用.我想要类似的东西,能够点击我的GridView的任何项目.

到目前为止,我已经逐一尝试了以下所有方法,但它们似乎都没有工作,我尝试了不同的堆栈问题但是甚至没有一个答案对我有效. iconsGrid.setSelection(2);, iconsGrid.setSelected(true);, iconsGrid.performClick();, iconsGrid.performItemClick(iconsGrid, 2, 2);, iconsGrid.performItemClick(iconsGrid, 2, iconsGrid.getItemIdAtPosition(2));,

//Activity
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mTextView = (TextView) findViewById(R.id.txt);
    Integer[] resource_icons = { 
            R.drawable.ic_attachment,
            R.drawable.ic_attachment,
            R.drawable.ic_attachment,
            R.drawable.ic_attachment,
            R.drawable.ic_attachment,
            R.drawable.ic_attachment };

    GridView iconsGrid = (GridView) findViewById(R.id.gv_icons);
    IconGridAdapter iconAdapter = new IconGridAdapter(this, resource_icons);
    iconsGrid.setAdapter(iconAdapter);
   /*
    * I want to perform a click here
    */
}

//Adapter
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater li;
    View grid;
    if (convertView == null) {
        grid = new View(mContext);
        li = ((Activity) mContext).getLayoutInflater();
        grid = li.inflate(R.layout.grid_cell_imageview, parent, false);
    } else {
        grid = (View) convertView;
    }

    ImageView imageView = (ImageView) grid.findViewById(R.id.image);
    imageView.setImageResource(imageId[position]);

    return grid;
}

Answer 1

好吧,让我们这样做

声明你的适配器中的一个字段说

private int selectedPosition=-1;

现在为此创建一个setter

private void setSelectedPosition(int position)
{
selectedPosition=position;
}

现在在你的getView方法中

if(position==selectedPosition)
    {
    grid.setSelected(true);

    //OR

    grid.setBackgroundColor(<Some Color>);
    }

现在设置适配器后

adapter.setSelectedPosition(<your desired selected item position>);

adapter.notifyDataSetChanged();