Dialog With Transparent Background in Android

Dialog with transparent background in Android

Add this code

 dialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));

Or this one instead:

dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);

android - Dialog with transparent background (with any color)

Ok I got the solution

First make change in theme.
Don't make custome theme. Use android.R.style.Theme_Translucent_NoTitleBar_Fullscreen

final Dialog dialog = new Dialog(BookAppointmentActivity.this, android.R.style.Theme_Translucent_NoTitleBar_Fullscreen);

instead of custom theme, and add following:

window.setBackgroundDrawableResource(R.color.dialog_back);

Full code:

final Dialog dialog = new Dialog(context, android.R.style.Theme_Translucent_NoTitleBar_Fullscreen);

dialog.setContentView(R.layout.customedialog);
Window window = dialog.getWindow();

window.setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));

window.setBackgroundDrawableResource(R.color.dialog_back);
dialog.show();

Use color from your resource file color.xml and at last but not least don't forget to decrease the opacity of the color.

Custom dialog with white transparent background

Try this :

Use color code for white transperent : #B3ffffff

Dialog alertDialog = new Dialog(this);
        alertDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        alertDialog.setContentView(R.layout.photo_dialog);
        alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(mContext.getResources().getColor(R.color.white_transperent)));
        alertDialog.show();

You can adjust this hash code according your transparency requirement. use link

How can I set a background transparency to a Dialog in Android?

You can make use of this class. Change the color and transparency here Color.parseColor("#66F9B639")

public class LoadingDialog {

    private static LoadingDialog instance;
    private Dialog dialog;

    public static LoadingDialog getInstance() {
        if (instance == null) {
            synchronized (LoadingDialog.class) {
                if (instance == null) {
                    instance = new LoadingDialog();
                }
            }
        }
        return instance;
    }

    public void show(Context context) {
        if (dialog != null && dialog.isShowing())
            return;
        dialog = new Dialog(context);
        dialog.setCanceledOnTouchOutside(false);
        dialog.setCancelable(false);
        dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#6620314c")));
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.setContentView(R.layout.custom_loading);
        ViewGroup.LayoutParams params = dialog.getWindow().getAttributes();
        params.width = ViewGroup.LayoutParams.MATCH_PARENT;
        params.height = ViewGroup.LayoutParams.MATCH_PARENT;
        dialog.getWindow().setLayout(params.width, params.height);
        dialog.show();
    }

    public void dismiss() {
        if (dialog != null && dialog.isShowing()) {
            dialog.dismiss();
        }
    }
}

How do I add back the transparent background around my dialog activity with a custom theme

As @nima pointed out you can use getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT)); to make the background transparent.

This will introduce a couple of issues:

• Transparency of everything

  Fix this by setting a white background to the ConstraintLayout root layout.

• Transparent activity title

  Fix this by removing the title from the manifest and set it to an empty one in activity with setTitle(""); and add another TextView to represent the title in the layout:

Remove the title (android:label) from the activity in the manifest:
Also you should android:exported="true" as it seems that this activity should be exported to other apps:

<activity
    android:name=".activity.LockScreenActivity"
    android:theme="@style/Theme.AppCompat.DayNight.Dialog"/>

Set the title & background:

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

    getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
    setTitle("");

}

Layout:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="wrap_content"
    android:background="@color/white"
    android:paddingHorizontal="16dp"
    android:paddingTop="16dp"
    tools:context=".LockScreenActivity">

    <TextView
        android:id="@+id/textView1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="Application Blocked"
        android:textSize="22sp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="@id/textView2"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="214dp"
        android:layout_height="136dp"
        android:gravity="center_vertical"
        android:padding="20dp"
        android:text="@string/aplicacao_bloqueada_text"
        android:textAlignment="viewStart"
        android:textSize="16sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView1" />
</androidx.constraintlayout.widget.ConstraintLayout>

UPDATE:

When I use my custom theme, as opposed to Theme.AppCompat.DayNight.Dialog, I still get the black screen

This is because the android:backgroundDimAmount is set to 50 in your custom theme; the valid range for this attribute is 0 through 1; any value greater than that will be considered 1...

0 means there is no dimming (completely transparent, and 1 meaning 100% opaque/black.

So to fix this issue, I guess you mean by 50 as the half way, so you'd set it to 0.5 instead:

<style name="dialog_theme" parent="Theme.AppCompat.DayNight.Dialog">
        <item name="android:textColor">@color/white</item>
        <item name="android:windowBackground">@color/dark_gray</item>
        <item name="android:backgroundDimEnabled">true</item>
        <item name="android:backgroundDimAmount">0.5</item>
</style>

BottomSheetDialog with transparent background

So, I figured out 2 solutions.

Best one:

Create an activity with transparent background just for your bottom sheet.
Implement your own layout with a coordinator layout and a bottom sheet.
Set the margin you want.
Set the content you want.

Not tested yet.

Lazy one:

Extends BottomSheetDialogFragment, in onActivityCreated add:

    Resources resources = getResources();

    // Set margin for Landscape Mode. Maybe a more elegant solution will be to implements our own bottom sheet with our own margins.
    if (resources.getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
        assert getView() != null;
        View parent = (View) getView().getParent();
        CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) parent.getLayoutParams();
        layoutParams.setMargins(
                resources.getDimensionPixelSize(R.dimen.bottom_sheet_margin_left), // 64dp
                0,
                resources.getDimensionPixelSize(R.dimen.bottom_sheet_margin_right), // 64dp
                0
        );
        parent.setLayoutParams(layoutParams);
    }

How can I make the background of my dialog in android transparent?

Add this code where you are initializing your dialog

dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);

or you can also add this code instead

 dialog.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));

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