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Change custom title view at runtime. Android

Sometimes you are invited to update the string label of your title bar activity at runtime.



To do this,  we start by adding a new xml file of the  custom view  to be  use as  a new layout for the title bar view.

We use in this example a textView view  to update the title's string.

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/screen"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:orientation="vertical">
   
    <TextView android:id="@+id/custom_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
         />
</RelativeLayout>

In the main.xml  file, we use an EditView and a Button to simulate the update of the Acitivity title label.


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/screen"   
     android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="10px"
        android:baselineAligned="false"
        >
      
        <EditText
         android:id="@+id/edit_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:maxEms="10"
            android:minEms="10"
            android:layout_gravity="center_vertical"
            android:text="@string/custom_title_edit" />
                  
        <Button android:id="@+id/change_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:text="@string/custom_title_button"/>
           
    </LinearLayout>


Finally, in your Java file  use the Window.setfeatureInt method   to apply the new layout to the title bar view. 

@Override
    public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
       
    setContentView(R.layout.main);       
    getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title);
       
    final TextView customText = (TextView) findViewById(R.id.custom_text);
    final EditText textEdit = (EditText) findViewById(R.id.edit_text);
    Button Change_button = (Button) findViewById(R.id.change_button);
       
       
     Change_button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
             customText.setText(textEdit.getText());
            }
        });
       
    }
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