Why NullPointerException when programmatically add my text view?

Question

I programmatically created a linear layout in my Activity like the following:

LinearLayout myContent = new LinearLayout(this);
myContent.setOrientation(LinearLayout.VERTICAL);

Then, I defined a text view in xml (under res/layout/) like below:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/name_text"
    android:layout_width="80dp"
    android:layout_height="40dp"
    android:gravity="center"
/>

After that, I would like to add several TextView defined above to myContent linear layout programmatically like below:

//my content is a linear layout
LinearLayout myContent = new LinearLayout(this);
myContent.setOrientation(LinearLayout.VERTICAL);

for(int i=0; i<10; i++){
  //get my text view resource
  TextView nameField = (TextView)findViewById(R.id.name_text);


  nameField.setText("name: "+Integer.toString(i)); //NullPointerException here
}

myContent.addView();

I thought the above code should add 10 TextView with name into myContent linear layout. But I end up with a NullPointerException at nameField.setText(...); (see above code) Why?

P.S. (Update)

myContent Linear Layout is added to another linear layout which is defined in main.xml, and my activity has setContentView(R.layout.main)

Answer 1

If your R.id.name_text is in another layout, you have to inflate that layout and then attach it,
because when you refer to R.id.name_text, it cannot be found because your layout is not present unless its inflated.

e.g.

View child = getLayoutInflater().inflate(R.layout.child);
myContent.addView(child);