我使用以下XML作为列表项布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="@+id/currentUserIndicator"
android:layout_width="30dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="@color/blue" />
<TextView
android:id="@+id/workerName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/currentUserIndicator"
android:padding="30dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
它看起来像那样:
现在的问题是,当我在列表适配器上使用它时:
adapter = new ArrayAdapter<WorkerUser>(this, R.layout.list_item_worker, workerList) {
@Override
public View getView(final int position, final View convertView, final ViewGroup parent) {
final View container;
if (convertView == null) {
container = inflater.inflate(R.layout.list_item_worker, parent, false);
} else {
container = convertView;
}
final TextView view = (TextView) container.findViewById(R.id.workerName);
final View indicator = container.findViewById(R.id.currentUserIndicator);
final WorkerUser item = getItem(position);
view.setText(item.firstname + " " + item.lastname);
return container;
}
};
它只是不起作用,左边的蓝色矩形不会显示!有谁知道为什么?
答案 0 :(得分:2)
您已关闭其中包含0个孩子的RelativeLayout
。因为它有0个孩子,所以它的高度设置为zero
,因此它已经消失了。您需要在其中放置一些元素才能显示或设置dp
中的高度
我猜你试图将TextView
放在RelativeLayout
内,如果是这样的话就试试吧
<RelativeLayout
android:id="@+id/currentUserIndicator"
android:layout_width="30dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="@color/blue" >
<TextView
android:id="@+id/workerName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/currentUserIndicator"
android:padding="30dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>