通过数组适配器以编程方式添加视图

Question

我正在使用数组适配器显示列表视图。对于每个列表项，我都会膨胀相同的 xml 文件。我能够很好地显示列表视图。但现在我有另一个要求。我想以编程方式将更多视图添加到我为每个列表项膨胀的同一个 xml 文件中。但是当我尝试这样做时，我没有收到任何错误。但不知何故，我以编程方式添加的视图没有显示出来......谁能帮助我。下面是xml布局和arrayadapter的代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/placeholder"
android:layout_width="match_parent"
android:layout_height="match_parent" 
android:background="@color/listitemcolor"
android:padding="10dip">

<LinearLayout
    android:layout_weight="1.0"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <TextView
            android:textColor="@android:color/black"
            android:id="@+id/locationitem_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Medium Text"
            android:textSize="16dp"
            android:textStyle="bold" />

        <LinearLayout
            android:layout_marginTop="5dip"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:drawableLeft="@drawable/like"
                android:textColor="#008000"
                android:id="@+id/textView2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Likes"
                android:textSize="12dp"
                android:textStyle="bold" />

            <TextView
                android:textColor="#008000"
                android:layout_marginLeft="5dip"
                android:id="@+id/number_of_likes"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="15"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:drawableLeft="@drawable/dislike"
                android:textColor="#FF0000"
                android:layout_marginLeft="10dip"
                android:id="@+id/textView3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Dislikes"
                android:textSize="12dp"
                android:textStyle="bold" />

            <TextView
                android:textColor="#FF0000"
                android:layout_marginLeft="5dip"
                android:id="@+id/number_of_dislikes"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="8"
                android:textAppearance="?android:attr/textAppearanceSmall" />

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

这是arrayadapter的代码：

 public class LocationItemAdapter extends ArrayAdapter<LocationItem> {

private Context context;
private ArrayList<LocationItem> items;

public LocationItemAdapter(Context context,
        List<LocationItem> objects) {
    super(context, R.layout.locationitem_listview_element, objects);

    this.context = context;
    items = (ArrayList<LocationItem>) objects;

}





/* (non-Javadoc)
 * @see android.widget.ArrayAdapter#getView(int, android.view.View, android.view.ViewGroup)
 */
@Override
public View getView(int position, View convertView, ViewGroup parent) {



    View rowview = null;
    if(convertView == null)
    {

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        rowview = inflater.inflate(R.layout.locationitem_listview_element, null);

    }
    else
    {
        rowview = convertView;
    }

    ((TextView)rowview.findViewById(R.id.locationitem_name)).setText(items.get(position).getName());
    ((TextView)rowview.findViewById(R.id.number_of_likes)).setText(String.valueOf(items.get(position).getLikes()));
    ((TextView)rowview.findViewById(R.id.number_of_dislikes)).setText(String.valueOf(items.get(position).getDislikes()));
    LayoutInflater inflater1 = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    TextView tv = new TextView(context);
    //TextView tv = (TextView)inflater1.inflate(R.layout.sample, null);
    tv.setText("My name is blah");
    tv.setTextColor(R.color.black);
    tv.setLayoutParams(new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.MATCH_PARENT));

    //tv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
    LinearLayout ll = (LinearLayout)rowview.findViewById(R.id.placeholder);
    //((LinearLayout)rowview.findViewById(R.id.placeholder)).addView(tv);
    ll.addView(tv);
    rowview.setTag(items.get(position));
    return rowview;
}

}

Answer 1

这对我来说是正确的。也许嵌入成功但不会占用屏幕空间？你能通过将它的背景颜色设置为粉红色或其他东西来验证占位符在屏幕上占用了一些可见空间吗？