I have created two layouts for portrait and landscape mode, My scenario is I want to change the Text of TextView based on the orientation changes. here is my code:-

AndroidManifest.xml:

```
<activity android:name=".MainActivity"
        android:configChanges="orientation|screenSize|keyboardHidden">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

```

activity\_main.xml (portrait)

```
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.demo.textdemo.MainActivity">
<TextView
    android:id="@+id/textViewHello"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    android:layout_gravity="center"
    android:gravity="center"
    android:textSize="20dp" />

```

activity\_main.xml (landscape):

```
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.demo.textdemo.MainActivity">

<TextView
    android:id="@+id/textViewHello"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="Hello World!"
    android:layout_gravity="center"
    android:gravity="center"
    android:textSize="20dp"
    />

```

MainActivity:

```
public class MainActivity extends AppCompatActivity {

TextView textViewHello;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    textViewHello = (TextView)findViewById(R.id.textViewHello);
    Configuration newConfig = getResources().getConfiguration();
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
        textViewHello.setText("ORIENTATION LANDSCAPE");
    }else {

        textViewHello.setText("ORIENTATION PORTRAIT");
    }

}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
        Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
        setContentView(R.layout.activity_main);

        textViewHello.setText("ORIENTATION LANDSCAPE");

    } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
        Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
        setContentView(R.layout.activity_main);
        textViewHello.setText("ORIENTATION PORTRAIT");
    }
}

```

}

For the First Time, it shows the change in TextView according to the Orientation but when I change the Orientation it shows "Hello World!" , which define in activity\_main.xml, I don't know why ??