List/GridView中的选择器未显示

Question

我有一个带有自定义适配器的GridView,当我从列表中选择一个项目时,选择器会显示一秒钟并消失.我想自定义适配器会导致它,我尝试使用它和选择器,但无济于事.

这是我的适配器(基于"Hello,Views"中的网格视图示例):

package shira.android.paintdroid;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ImageView;

class PaintActionsAdapter extends BaseAdapter
{
private Context context;
private int[] actionsImagesResources;

public PaintActionsAdapter(Context context)
{
    if (context==null)
        throw new IllegalArgumentException("The context must be non-null!");
    this.context=context;
    /*actionsImagesResources=context.getResources().getIntArray(R.array.
            actions_images);*/
    actionsImagesResources=new int[6];
    for (int counter=0;counter<actionsImagesResources.length;counter++)
        actionsImagesResources[counter]=R.drawable.pencil;
}

public int getCount() { return actionsImagesResources.length; }

public long getItemId(int position)
{ return actionsImagesResources[position]; }

public Object getItem(int position) 
{ return actionsImagesResources[position]; }

public View getView(int position,View convertView,ViewGroup parent)
{
    ImageView actionImageView;
    if (convertView==null)
    {
        actionImageView=new ImageView(context);
        AbsListView.LayoutParams layoutParams=new AbsListView.LayoutParams(
                ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.
                FILL_PARENT);
        actionImageView.setLayoutParams(layoutParams);
        //actionImageView.setAlpha(0);
    }
    else actionImageView=(ImageView)convertView;
    actionImageView.setImageResource(actionsImagesResources[position]);
    return actionImageView;
}
}

这是布局:

<GridView android:id="@+id/paint_actions_grid" android:layout_width="0dip"
        android:layout_height="fill_parent" android:numColumns="2" 
        android:layout_weight="0.15" android:drawSelectorOnTop="true"/> <!-- android:background="@color/ui_background_color"/> --> 
        <!-- android:listSelector="@drawable/actions_list_selector"/> -->

谢谢你的帮助.

这是GridView现在看起来如何的图像捕获(目前,所有项目都具有相同的图像).我希望在所选图像周围绘制一些颜色的框架,但是我得到一个橙色矩形,在一秒钟之后消失,正如我所说的那样.

Answer 1

这是因为在触摸模式下没有选择的东西.请参阅此处的文档.

您可以通过将网格单元布局设置为可单击android:clckickable="true",然后按照此处所述创建ColorStateList来解决此问题.

您想要使用的状态是activated.在选择器xml中使用该状态.

<selector xmlns:android="http://schemas.android.com/apk/res/android"> 
   <item android:state_activated="true" android:color="@color/your_activated_color" />  
    <item android:color="@color/your_standard_color"/> 
</selector>

然后将选择器xml设置为gridview单元格布局的背景.这应该达到预期的效果.