Question

So this is my main layout and I want to add items programmatically as they will be dynamic.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/mainlayout" >
</LinearLayout>

The problem is, when I look for the LinearLayout with;

LinearLayout layout = (LinearLayout)findViewById(R.id.mainlayout);

Immediately after super.onCreate(savedInstanceState); it returns null. Even if I wait until onStart() or onResume(), it doesn’t seem to be there. Any suggestions as to why this might be the case?

Answer 1

– Immediately after super.onCreate(savedInstanceState) you should use setContentView(R.layout.youLayout).

– Its only after the setContentView() method, one can assign ids to the Views, cause till then the Views aren’t initialized.