5

我正在为列表视图构建一个自定义适配器 - 我希望这个适配器为列表视图提供交替的背景颜色。

boolean alternate = false;

@Override
public View getView(int position, View convertView, ViewGroup parent) {

        if (alternate)
        {
            // set background colour of this item?
        }

        alternate = !alternate;

        // lots of other stuff here

        return convertView;     }

如何在上下文中设置列表视图项的背景?

4

7 回答 7

16

备用列表项背景

这些是下面要做的步骤。Step1.1) 对奇偶位置列表项使用两个选择器

艺术家列表背景色.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item
 android:state_selected="false"
    android:state_pressed="false"
    android:drawable="@color/grey" />
<item android:state_pressed="true"
    android:drawable="@color/itemselected" />
<item android:state_selected="true"
 android:state_pressed="false"
    android:drawable="@color/itemselected" />
</selector>

步骤 1.2) Artists_list_background_alternate.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 <item
 android:state_selected="false"
    android:state_pressed="false"
    android:drawable="@color/sign_out_color" />
<item android:state_pressed="true"
    android:drawable="@color/login_hover" />
<item android:state_selected="true"
 android:state_pressed="false"
    android:drawable="@color/login_hover" />
</selector>

Step2) 颜色.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <color name="survey_toplist_item">#EFEDEC</color>
    <color name="survey_alternate_color">#EBE7E6</color>
    <color name="grey">#ffffff</color>
    <color name="itemselected">#EDEDED</color>
    <color name="login_hover">#E5F5FA</color>
    <color name="sign_out_color">#e84040</color>

</resources>

步骤 3) 在 Arrayadapter 中:

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;
        if (view == null) {
            view = lInflater.inflate(R.layout.listitem, parent, false);
        }

        if (position % 2 == 0) {
            view.setBackgroundResource(R.drawable.artists_list_backgroundcolor);
        } else {
            view.setBackgroundResource(R.drawable.artists_list_background_alternate);
        }

        ((TextView) view.findViewById(R.id.heading)).setText(data.get(position));

        return view;
    }

有关更多详细信息,请通过 belog 链接

http://amitandroid.blogspot.in/2013/03/android-listview-with-alternate-list.html

于 2013-09-20T12:58:19.420 回答
3

您没有朝着正确的方向前进,就好像视图被重复使用一样,您可能会得到意想不到的结果,因为一些回收的视图将具有不同的颜色,而另一些则没有。

而不是上面,根据位置设置背景。就像是:

if(position % 2 == 0) {
    // set some color
} else {
    // set the other color
}
于 2013-09-20T12:56:13.243 回答
2

您可以使用以下代码:

 if (position % 2 == 0) {
            holder.image.setBackgroundResource(R.drawable.image1);
        } else {
           holder.image.setBackgroundResource(R.drawable.image2);
        }
于 2013-09-20T13:20:13.927 回答
0

你可以在你的适配器中做

   public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView == null) {
            inflater = ((Activity) context).getLayoutInflater();
            convertView = inflater.inflate(resourceId, parent, false);
        }
       Person user = getItem(position);

       if(user.isCharged)
       convertView.setBackgroundColor(Color.BLUE);
    }

这将应用于您的所有项目

于 2015-02-16T20:26:37.490 回答
0

如果我错了,请纠正我,但我是这样做的:

@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
        convertView = ((LayoutInflater) this._ctx
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE))
                .inflate(this._resource, parent, false);

    }

   switch(position % 3){
      case 0: convertView.setBackgroun....
          break;
      .... (case 1; case 2;)

   }

return convertView;

}
于 2013-09-20T12:57:28.673 回答
0
 private int[] colors = new int[] { 0xffD3D3D3, 0xffA9A9A9 };

    inside getView refer the id
     holder._linear_text_active_release_date = (LinearLayout) convertView.findViewById(R.id.relative_text_active_release_date);

holder._linear_text_active_release_status = (LinearLayout) convertView.findViewById(R.id.linear_text_active_release_status); 
add these lines in the getView to set the colour for layout row

holder._linear_text_active_release_status.setBackgroundColor(Color.LTGRA;
            holder._linear_text_active_release_pass.setBackgroundColor(ContextCompat.getColor(context,R.color.amber));
于 2016-12-07T09:59:48.490 回答
0

在此处输入图像描述 我想强调解决方案,以免人们感到困惑。

如果您想要颜色/图像,或者在绘制时对列表视图进行的任何更改,您需要在 getView 中设置它,如下所示,但如果您希望它在点击时显示,您需要在 onClick 方法中进行,如下所示。

    @Override
    public View getView(int position, View view, ViewGroup parent) {
        if(view == null) {
            view = inflater.inflate(R.layout.dashboard_item, parent, false);
        }

        if(selected[position]) {
            view.setBackgroundColor(Color.LTGRAY);
        } else {
            selected[position] = false;
            view.setBackgroundColor(Color.WHITE);
        }
        return view;
    }

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            //this is just my custom object..you could also assign your boolean here to see if it is "highlighted"
            Item o = (Item)listView.getItemAtPosition(position);
            if(adapter.selected[position] == true) {
                adapter.selected[position] = false;
                view.setBackgroundColor(Color.WHITE);
            } else {
                adapter.selected[position] = true;
                view.setBackgroundColor(Color.LTGRAY);
            }
     }

我的布尔检查只是一个布尔数组

private boolean[] selected;

我在 ArrayAdapter 构造函数的子类中初始化它。

selected = new boolean[objects.size()];
Arrays.fill(selected, Boolean.FALSE);
于 2019-07-02T13:19:42.767 回答