android - Remove White Background in Bottom Sheet Dialog Fragment

Android - Remove White Background in Bottom Sheet Dialog Fragment

To remove the white background in a BottomSheetDialogFragment, you need to customize the background drawable of the bottom sheet. Here's how you can do it:

Step 1: Create a Custom Background Drawable

Create a custom drawable resource file that defines a transparent background.

Example: res/drawable/transparent_background.xml

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="@android:color/transparent" /> <corners android:radius="16dp" /> <!-- Optional: to round the corners --> </shape>

Step 2: Set the Custom Background Drawable in the BottomSheetDialogFragment

Override the onCreateDialog method in your BottomSheetDialogFragment to set the custom background drawable.

Example:

public class MyBottomSheetDialogFragment extends BottomSheetDialogFragment { @Override public Dialog onCreateDialog(Bundle savedInstanceState) { BottomSheetDialog dialog = (BottomSheetDialog) super.onCreateDialog(savedInstanceState); // Set the custom background drawable dialog.setOnShowListener(dialogInterface -> { BottomSheetDialog bottomSheetDialog = (BottomSheetDialog) dialogInterface; FrameLayout bottomSheet = bottomSheetDialog.findViewById(com.google.android.material.R.id.design_bottom_sheet); if (bottomSheet != null) { bottomSheet.setBackgroundResource(R.drawable.transparent_background); } }); return dialog; } }

Step 3: Customize the Theme (Optional)

You may also need to customize the theme of the BottomSheetDialogFragment to ensure that the background is fully transparent.

Example:

Add the custom theme in res/values/styles.xml:

<resources> <!-- Base application theme. --> <style name="AppTheme" parent="Theme.MaterialComponents.DayNight.DarkActionBar"> <!-- Customize your theme here. --> <item name="bottomSheetDialogTheme">@style/CustomBottomSheetDialogTheme</item> </style> <style name="CustomBottomSheetDialogTheme" parent="Theme.Design.Light.BottomSheetDialog"> <item name="bottomSheetStyle">@style/CustomBottomSheetStyle</item> </style> <style name="CustomBottomSheetStyle" parent="Widget.Design.BottomSheet.Modal"> <item name="android:background">@drawable/transparent_background</item> </style> </resources>

Apply the custom theme to your BottomSheetDialogFragment in AndroidManifest.xml (if needed):

<activity android:name=".YourActivity" android:theme="@style/CustomBottomSheetDialogTheme" />

Step 4: Inflate the Custom View

Ensure that your layout for the BottomSheetDialogFragment is inflated correctly.

Example:

@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_my_bottom_sheet_dialog, container, false); }

By following these steps, you can remove the white background from your BottomSheetDialogFragment and customize it as needed.

Examples

  1. How to set the background color of BottomSheetDialogFragment to transparent?

    • Description: Override the onCreateView method to set a transparent background for the bottom sheet.
    • Code:
      @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_bottom_sheet, container, false); view.setBackgroundColor(Color.TRANSPARENT); // Set transparent background return view; }

  2. How to remove the default white background in BottomSheetDialogFragment?

    • Description: Use a custom style for the dialog to remove the background.
    • Code:
      <!-- styles.xml --> <style name="CustomBottomSheetDialog" parent="Theme.Design.BottomSheetDialog"> <item name="backgroundColor">@android:color/transparent</item> </style>

  3. How to change the BottomSheetDialogFragment's background programmatically?

    • Description: Modify the background of the bottom sheet in onStart.
    • Code:
      @Override public void onStart() { super.onStart(); BottomSheetDialog dialog = (BottomSheetDialog) getDialog(); if (dialog != null) { View bottomSheet = dialog.findViewById(com.google.android.material.R.id.design_bottom_sheet); if (bottomSheet != null) { bottomSheet.setBackgroundColor(Color.TRANSPARENT); // Remove background } } }

  4. How to customize the background of BottomSheetDialogFragment using XML?

    • Description: Define a custom background drawable for the bottom sheet.
    • Code:
      <!-- bottom_sheet_background.xml --> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="@android:color/transparent"/> </shape>

  5. How to set a drawable as the background for BottomSheetDialogFragment?

    • Description: Use a drawable resource as the background for the bottom sheet.
    • Code:
      @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_bottom_sheet, container, false); view.setBackgroundResource(R.drawable.bottom_sheet_background); // Set custom drawable return view; }

  6. How to remove the elevation effect from BottomSheetDialogFragment?

    • Description: Set the elevation to zero to remove the shadow effect.
    • Code:
      @Override public void onStart() { super.onStart(); BottomSheetDialog dialog = (BottomSheetDialog) getDialog(); if (dialog != null) { dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); dialog.setCancelable(true); } }

  7. How to apply a custom theme to BottomSheetDialogFragment?

    • Description: Create a custom theme in styles.xml and apply it to the dialog.
    • Code:
      <!-- styles.xml --> <style name="CustomBottomSheetDialog" parent="Theme.MaterialComponents.Light.BottomSheetDialog"> <item name="backgroundColor">@android:color/transparent</item> </style>

  8. How to prevent BottomSheetDialogFragment from closing when clicking outside?

    • Description: Override the onTouchEvent method to handle touch events.
    • Code:
      @Override public void onStart() { super.onStart(); BottomSheetDialog dialog = (BottomSheetDialog) getDialog(); if (dialog != null) { dialog.setCanceledOnTouchOutside(false); // Prevent closing } }

  9. How to create a rounded corner effect for BottomSheetDialogFragment?

    • Description: Use a drawable with rounded corners for the background.
    • Code:
      <!-- rounded_bottom_sheet_background.xml --> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <corners android:radius="16dp"/> <solid android:color="@android:color/transparent"/> </shape>

  10. How to handle configuration changes in BottomSheetDialogFragment?

    • Description: Implement onSaveInstanceState to maintain the background during configuration changes.
    • Code:
      @Override public void onSaveInstanceState(@NonNull Bundle outState) { super.onSaveInstanceState(outState); outState.putInt("backgroundColor", Color.TRANSPARENT); // Save background color state }

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