Preventing my Activity to change orientation depending on its content

Question

In my app MainActivity contains a BottomNavigation, so it can display different tabs. Now my intention was, to force some of them to stay in portrait orientation, regardless of how the user holds the device.

MainActivity.java:

public class MainActivity extends AppCompatActivity {

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

    BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);
    bottomNav.setOnNavigationItemSelectedListener(navListener);
    getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new OverviewFragment()).commit();
}

private BottomNavigationView.OnNavigationItemSelectedListener navListener =
        new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                Fragment selectedFragment = null;

                switch (item.getItemId()) {
                    case R.id.nav_overview:
                        selectedFragment = new OverviewFragment();
                        break;
                    case R.id.nav_reports:
                        selectedFragment = new ReportsFragment();
                        break;
                    case R.id.nav_settings:
                        selectedFragment = new SettingsFragment();
                        break;
                }
                getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, selectedFragment).commit();
                return true;
            }
        };

}

activity_main.xml

<RelativeLayout 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=".MainActivity">

<FrameLayout
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_above="@id/bottom_navigation"/>

<android.support.design.widget.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:background="?android:attr/windowBackground"
    app:menu="@menu/bottom_navigation"/>

At least one tab should be displayable in portrait AND in landscape mode. Do I have to add some stuff into the xml, or do some java magic? Thanks in advance!

Answer 1

You can set screenOrientation in AndroidManifest.xml.

<activity
    android:name="yourActivity"
    android:screenOrientation="portrait"/>

This activity will remain portrait always.

If you need it programatically then you can use this.

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

Edit If i understood right, you want make different layout for different orientation.

Then create a layout-land directory and place the landscape layout XML file in that directory.