How to Make Custom Dialog with Rounded Corners in Android

How to make custom dialog with rounded corners in android

Create an XML file in drawable, say dialog_bg.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid
        android:color="@color/white"/>
    <corners
        android:radius="30dp" />
    <padding
        android:left="10dp"
        android:top="10dp"
        android:right="10dp"
        android:bottom="10dp" />
</shape>

set it as the background in your layout XML:

android:background="@drawable/dialog_bg"

Set the background of the dialog's root view to transparent, because Android puts your dialog layout within a root view that hides the corners in your custom layout.

Java:

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

Kotlin:

dialog.window?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))

Rounded corners for custom AlertDialog

Please take a look at this guide for how to customize dialogs.

In short, you need to create a dialog like normal, but set the background resource before you show it:

val builder = AlertDialog.Builder(context)
builder.setView(R.layout.item_dialog)
val dialog = builder.create()
dialog.window?.decorView?.setBackgroundResource(R.drawable.dialog_background) // setting the background
dialog.show()

where dialog_background is defined like so:

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <corners android:radius="16dp" />
    <solid android:color="?android:colorBackground" />
</shape>

Android Dialog with rounded corners - still showing the background without corners radius

Solution with AlertDialog with same layout (tested On Kitkat).

 AlertDialog.Builder dialogBuilder= new AlertDialog.Builder(this);
 dialogBuilder.setView(R.layout.temp);
 final AlertDialog alertDialog= dialogBuilder.create();
 alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
 alertDialog.show();

To appear Dialog as same you need set the width of dialog. Here is a reference. Otherwise it will take the Content width . Do all dialog.getWindow() operation before setting Content view to Dialog.

How to set round corners for a custom Dialog?

You can use the MaterialAlertDialogBuilder included in the Material Components library:

import androidx.fragment.app.DialogFragment;

public class CustomDialog extends DialogFragment {

    //...

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {

        return  new MaterialAlertDialogBuilder(getActivity(),R.style.MaterialAlertDialog_rounded)
                .setTitle("Title")
                .setMessage("Message")
                .setPositiveButton("OK", null)
                .create();

    }
}

with:

<style name="MaterialAlertDialog_rounded" parent="@style/ThemeOverlay.MaterialComponents.MaterialAlertDialog">
    <item name="shapeAppearanceOverlay">@style/ShapeAppearanceOverlay.MyApp.Dialog.Rounded</item>
</style>

<style name="ShapeAppearanceOverlay.MyApp.Dialog.Rounded" parent="">
    <item name="cornerFamily">rounded</item>
    <item name="cornerSize">8dp</item>
</style>

Dialog with rounded corner in android

If you want rounded corner you can try apply custom shape using xml to your custom dialog backgroud. Following code will help you out.

<shape xmlns:android="http://schemas.android.com/apk/res/android">

     <solid android:color="#FFFFFF" />
        <corners
            android:radius="10dp"/>

    </shape>

You can remove cardview as top element because dialog has its on shadow and depth.
Add this line before you set contentview to dialog

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

Android AlertDialog with rounded corners

You can do it using the following code:

CustomDialog.java:

public class MainActivity extends Activity{

    private static final int ALERT_DIALOG = 1;

    @Override
    public void onCreate( Bundle savedInstanceState )
    {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.main );

        ( (Button) findViewById( R.id.button1 ) )
            .setOnClickListener( new OnClickListener()
                {
                    public void onClick( View v )
                    {
                        showDialog( ALERT_DIALOG );
                    }
                }
            );
    }

    @Override
    protected Dialog onCreateDialog( int id ){
        Dialog dialog = null;
        if ( id == ALERT_DIALOG )
        {
            ContextThemeWrapper ctw = new ContextThemeWrapper( this, R.style.MyTheme );
            AlertDialog.Builder builder = new AlertDialog.Builder( ctw );
            builder.setMessage( "Hello World" )
                .setTitle( "Alert Dialog" )
                .setIcon( android.R.drawable.ic_dialog_alert )
                .setCancelable( false )
                .setPositiveButton( "Close", new DialogInterface.OnClickListener()
                    {
                        public void onClick( DialogInterface dialog, int which )
                           {
                                dialog.dismiss();
                           }
                        } 
                    );
            dialog = builder.create();
        }
        if ( dialog == null )
        {
            dialog = super.onCreateDialog( id );
        }
        return dialog;
     }
 }

dialog_title.xml

<?xml version="1.0" encoding="utf-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android" android:insetBottom="-1dp">
    <shape android:shape="rectangle">
        <solid android:color="#000000" />
        <corners android:topLeftRadius="20dp" android:topRightRadius="20dp" />
        <stroke android:color="#7F7F7F" android:width="1dp" />
    </shape>
</inset>

dialog_footer.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#7F7F7F" />
    <corners android:bottomLeftRadius="20dp" android:bottomRightRadius="20dp" />
    <stroke android:color="#7F7F7F" android:width="1dp" />
</shape>

Just change the radius amount in:

dialog_title.xml

and

dialog_footer.xml

and that'll generate the following output:

hope this will help you.

---

UPDATE:
I'm not an expert but this is what I found. It may be right or wrong.
After many attempts I ended up with the following:

1- ContextThemeWrapper is not applicable for API 14, it works fine on Gingerbread and older versions but with API > 10 it doesn't work.

2- to overcome the above issue and make it work on API > 10 as requested, I replace this line:

ContextThemeWrapper ctw = new ContextThemeWrapper( this, R.style.MyTheme );
AlertDialog.Builder builder= new AlertDialog.Builder( ctw );

with this:

AlertDialog.Builder builder= new AlertDialog.Builder( this,R.style.MyTheme );

but you need to change:

android:minSdkVersion="8"  

to

android:minSdkVersion="11" 

the result will be as shown in the following image on ICS (API 14):

This image is from a Samsung Galaxy S3 running ICS.

Note: modified project initiated with API 14 SO manifest sdk will be:

<uses-sdk
  android:minSdkVersion="11"
  android:targetSdkVersion="15" />

---

FINAL WORD:
As my little knowledge in Android development (I'm not an expert),

1- custom alert dialog runs smoothly in API < 10 but not > 10 with the same Java code,

if we want it to run in ICS with the same effect as appeared in API < 10, we need to modify the code, so it will run on ICS but will not run in any version down API 11.

2- even the result in ICS is not satisfactory, the round corner applies only to the title but not the footer.

---

SECOND UPDATE:
FINALLY I get all corners round,

JUST apply padding to dialog_footer.xml as follows:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
    <solid android:color="#7F7F7F" />
    <corners android:bottomLeftRadius="20dp" android:bottomRightRadius="20dp" />
    <stroke android:color="#7F7F7F" android:width="1dp" />
    <padding android:left="10dp" android:top="10dp" android:right="10dp"
android:bottom="10dp" /> 
</shape>

Output image:

This image is from a Samsung Galaxy S3 running ICS.

Making a rounded custom alert dialog: tinted area is incorrect

I had the same problem. Making the background transparent can solve this problem .

<style name="Theme_Dialog" parent="Theme.AppCompat.Light.Dialog">

  <item name="android:background">@android:color/transparent</item>
</style>

Add this style while initialing your dialog .

val dialog = Dialog(context, R.style.Theme_Dialog)

Not sure about your @drawable/rounded_corners". Instead, you can have card view and put this constraint layout inside card view . With app:cardCornerRadius="@dimen/space_18" you have set the radius as required .

<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:toots="http://schemas.android.com/tools"
android:orientation="vertical"
android:background="@color/white_color"
app:cardCornerRadius="@dimen/space_18">

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

  ..

</androidx.constraintlayout.widget.ConstraintLayout>

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