Android Visibility save/restore: Quick gist to demonstrate the fact that the visibility of views is not preserved across screen rotation or other save/restore cycles.

layout.xml

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    
    <TextView
        android:id="@+id/tv_hello"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
    />
    
    <Button
        android:id="@+id/btn_toggle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Toggle"
        android:onClick="toggle"
    />
    
</LinearLayout>

MainActivity.java

public class MainActivity extends Activity {

    private TextView tvHello;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        setContentView(R.layout.layout);
        tvHello = (TextView) findViewById(R.id.tv_hello);
    }
    
    public void toggle(View v) {
        tvHello.setVisibility(View.GONE);
    }
}