generating a LayoutParams based on the type of parent

I find myself needing to create a View completely in Java without knowing what concrete type the parent is.

example:

public View getView(int position, View convertView, ViewGroup parent){
    if(null == convertView){
        convertView = new TextView(parent.getContext());
    }
    ((TextView) convertView).setText(getItem(position).getName());
}

Now suppose I wanted to change this so that the convertView was wrap_content in both directions. Since this is an Adapter, I'd like to avoid coupling the Adapter with the concrete type of the parent, but the LayoutParams I give it in setLayoutParams() has to be the correct concrete type otherwise the app will crash (i.e. if parent is a ListView it has to be ListView.LayoutParams, if it's a LinearLayout it must be a LinearLayout.LayoutParams, etc.). I don't want to use a switch statement either since that's just a more flexible form of coupling, and if I attach this adapter to a view I didn't anticipate I still end up with a crash. Is there a generic way to do this?

Solution

You can do this using the following code:

LayoutParams params = parent.generateLayoutParams(null);

EDIT: The method above doesn't work because ViewGroup.generateLayoutParams() requires android:layout_width and android:layout_height to be set in the passed AttributeSet.

~~If you use ViewGroup.LayoutParams with any layout then everything will work fine. But if you use LinearLayout.LayoutParams with RelativeLayout for example, then an exception will be thrown.~~

EDIT: There's one working solution for this problem which I don't really like. The solution is to call generateLayoutParams() with valid AttributeSet. You can create an AttributeSet object using at least two different approaches. One of them I've implemented:

res\layout\params.xml:

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

<view xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="20dip" />

SomeActivity.java:

private void addView(ViewGroup viewGroup, View view) {
    viewGroup.addView(view);
    view.setLayoutParams(generateLayoutParams(viewGroup));
}

private ViewGroup.LayoutParams generateLayoutParams(ViewGroup viewGroup) {
    XmlResourceParser parser = getResources().getLayout(R.layout.params);
    try {
        while(parser.nextToken() != XmlPullParser.START_TAG) {
            // Skip everything until the view tag.
        }
        return viewGroup.generateLayoutParams(parser);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

Another way to create an AttributeSet object is to implement AttributeSet interface and make it return android:layout_width, android:layout_height and other layout attributes you need.