Settings: DevicePicker: Adapt to S style

Change-Id: Idd83ad50070c0541136afe02502752e75d6b162d

AndroidManifest.xml

@@ -830,7 +830,8 @@
                 android:label="@string/device_picker"
                 android:configChanges="orientation|keyboardHidden|screenSize"
                 android:exported="true"
-                android:clearTaskOnLaunch="true">
+                android:clearTaskOnLaunch="true"
+                android:theme="@style/Theme.SubSettingsBase">
             <intent-filter>
                 <action android:name="android.bluetooth.devicepicker.action.LAUNCH" />
                 <category android:name="android.intent.category.DEFAULT" />

src/com/android/settings/bluetooth/DevicePickerActivity.java

@@ -20,15 +20,14 @@ import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTE
 
 import android.os.Bundle;
 
-import androidx.fragment.app.FragmentActivity;
-
 import com.android.settings.R;
+import com.android.settingslib.collapsingtoolbar.CollapsingToolbarBaseActivity;
 
 /**
  * Activity for Bluetooth device picker dialog. The device picker logic
  * is implemented in the {@link BluetoothPairingDetail} fragment.
  */
-public final class DevicePickerActivity extends FragmentActivity {
+public final class DevicePickerActivity extends CollapsingToolbarBaseActivity {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {