Inserimento eseguito programmaticamente di LinearLayout esterno in un LinearLayout creato programmaticamente.

Ora provo a inserire programmaticamente un LinearLayout figlio in un LinearLayout creato programmaticamente.
Devo fare uso dell'inflater.

hills.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/hills"
    android:orientation="vertical" >
</LinearLayout> 

Parto dal presupposto che i LayoutParams siano già definiti nel layout esterno...

public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  
  LinearLayout ll=new LinearLayout(this);
  ll.setOrientation(LinearLayout.HORIZONTAL);
  ll.setBackground(getResources().getDrawable(R.drawable.sky));
  LayoutParams llParams=new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
  setContentView(ll,llParams); 
  
  LayoutInflater inflater=(LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  LinearLayout child=(LinearLayout)inflater.inflate(R.layout.hills, null);
  
  ll.addView(child);
  
 }

E ottengo questo:

Evidentemente devo creare i LayoutParams programmaticamente...

public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  
  LinearLayout ll=new LinearLayout(this);
  ll.setOrientation(LinearLayout.HORIZONTAL);
  ll.setBackground(getResources().getDrawable(R.drawable.sky));
  LayoutParams llParams=new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
  setContentView(ll,llParams); 
  
  LayoutInflater inflater=(LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  LinearLayout child=(LinearLayout)inflater.inflate(R.layout.hills, null);
  LayoutParams childParams = new LayoutParams(0,LayoutParams.MATCH_PARENT,1);
  ll.addView(child,childParams);
  
 }

E ottengo...

Creo un altro layout figlio programmaticamente e lo affianco:

public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  
  LinearLayout ll=new LinearLayout(this);
  ll.setOrientation(LinearLayout.HORIZONTAL);
  ll.setBackground(getResources().getDrawable(R.drawable.sky));
  LayoutParams llParams=new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
  setContentView(ll,llParams); 
  
  LayoutInflater inflater=(LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  LinearLayout child=(LinearLayout)inflater.inflate(R.layout.hills, null);
  LayoutParams childParams = new LayoutParams(0,LayoutParams.MATCH_PARENT,1);
  ll.addView(child,childParams);
  
  LinearLayout child1=new LinearLayout(this);
  child1.setBackground(getResources().getDrawable(R.drawable.w));
  ll.addView(child1,childParams);
  
 }

...e okay: