通过阵列适配器以编程方式添加视图

Question

我使用arrayadapter显示了一个listview。对于每个listitem我膨胀相同的XML文件。我能够显示列表视图fine.but现在我有另一个要求。我想以编程方式添加一些更多的视图到我为每个列表项目充气的同一个xml文件。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......任何人都可以请帮助我。以下是XML布局和一个ArrayAdapter

<?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> 

代码这是arrayadapter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

这看起来正确的给我。也许嵌入是成功的，但会在屏幕上没有空间？你可以通过将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定量的可见空间吗？