Question

I just started android and I tried below questions to get this answer before posting it here:

Android – Adding layout at runtime to main layout

Add button to a layout programmatically

Dynamically adding a child to LinearLayout with getting each child's position

And I am still not able to add a button to linear layout 🙁

Below is the code for activity, please let me know where I am wrong:

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        LinearLayout layout = (LinearLayout) View.inflate(this, R.layout.activity_main, null);

        Button btn = new Button(this);
        btn.setId(123);
        btn.setText("Welcome to WI FI World");
        layout.addView(btn);
    }

And xml looks like below:

<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" >

</LinearLayout>

Answer 1

Take the Id for LinearLayout in XML and in jave code use that id of LinearLayout from XML

<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/linear" >

</LinearLayout>

In onCreate():

LinearLayout linear=(LinearLayout)findViewById(R.id.linear);

 //Select widgets
 linear.addView()