BottomSheetDialog Unable to use AppCompatDelegate.setDefaultNightMode() to change background style

Question

like this

[picture][1]https://imgtu.com/i/Lk0ARs

Beginners searched the Internet and couldn't find the results they wanted, so I came here to ask everyone, I'm sorry to trouble you!

What I want to do is that when I manually change the MODE_NIGHT using AppCompatDelegate.setDefaultNightMode(), the bottomsheetdialog can also follow the manual changes instead of still following the system.

---

layout

• activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="follow_system" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="MODE_NIGHT_NO" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="MODE_NIGHT_yes" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="show_dialog" />
</LinearLayout>

• dialog_date_picker.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/bottomSheetContainer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:background="@drawable/dialog_date_picker_backdround"
    android:orientation="horizontal"
    android:padding="10dp">


    <LinearLayout
        android:id="@+id/number_picker_height"
        android:layout_width="match_parent"
        android:layout_height="270dp"
        android:layout_gravity="center"
        android:gravity="center"
        android:orientation="horizontal">

    </LinearLayout>
</LinearLayout>

java code

• MainActivity.java

public class MainActivity extends AppCompatActivity {

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

        BottomSheetDialog bottomSheetDialog = new BottomSheetDialog(this, R.style.BottomSheetDialogTheme);
        View bottomSheetView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.dialog_date_picker, findViewById(R.id.bottomSheetContainer));
        bottomSheetDialog.setContentView(bottomSheetView);

        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
                recreate();
            }
        });

        findViewById(R.id.button2).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
                recreate();
            }
        });
        findViewById(R.id.button3).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
                recreate();
            }
        });
        findViewById(R.id.button4).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                bottomSheetDialog.show();
            }
        });
    }
}

• color.xml

values/color.xml
<color name="Choose_Year_Month_BottomSheetDialog_background">#FFFFFF</color>

values-night/color.xml
<color name="Choose_Year_Month_BottomSheetDialog_background">#000000</color>

• dialog_date_picker_backdround.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <solid android:color="@color/Choose_Year_Month_BottomSheetDialog_background" />
    <corners
        android:bottomLeftRadius="0dp"
        android:bottomRightRadius="0dp"
        android:topLeftRadius="20dp"
        android:topRightRadius="20dp" />

</shape>

<style name="BottomSheetDialogTheme" parent="Theme.MaterialComponents.Light.BottomSheetDialog">
        <item name="bottomSheetStyle">@style/BottomSheetStyle</item>
        <item name="android:backgroundDimEnabled">false</item>
    </style>

    <style name="BottomSheetStyle" parent="Widget.Design.BottomSheet.Modal">
        <item name="android:background">@android:color/transparent</item>
    </style>