How to Change the Background of Android Alert Dialogs

Change the background color of a pop-up dialog

If you just want a light theme and aren't particular about the specific color, then you can pass a theme id to the AlertDialog.Builder constructor.

AlertDialog.Builder(this, AlertDialog.THEME_HOLO_LIGHT)...

or

AlertDialog.Builder(this, AlertDialog.THEME_DEVICE_DEFAULT_LIGHT)...

Alert Dialog background theme/Color

Create your style in your styles.xml file as follows.

<style name="AlertDialogCustom" parent="@android:style/Theme.Dialog">
        <item name="android:textColor">@color/White</item>
        <item name="android:textStyle">bold</item>
        <item name="android:headerDividersEnabled">true</item>
        <item name="android:typeface">normal</item>
        <item name="android:background">@color/colorPrimaryDark</item>
    </style>

Then Create Alert Dialog using Builder as follows

AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(this/getActvity(), R.style.AlertDialogCustom));

Here passing the current class Context and style to the ContextThemeWrapper class constructor.

android how to change background colour in AlertDialog

finally i did it..created a custom dialog..,and its working

private void showdialog() {

    final Dialog dialog = new Dialog(RegisterScreen.this, R.style.CenterDialog);

    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog.setContentView(R.layout.custom_dialog_layout);
    dialog.setCancelable(true);

    final Spinner sp = (Spinner) dialog.findViewById(R.id.spinner);
    ArrayAdapter<String> adapter_chocolate = new ArrayAdapter<String>(RegisterScreen.this,
            android.R.layout.simple_spinner_item, CountryCodeArray);
    sp.setAdapter(adapter_chocolate);
    sp.setOnItemSelectedListener(new MyOnItemSelectedListener());

    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(RegisterScreen.this);
    //alertDialogBuilder.setTitle("Missing data");
    alertDialogBuilder.setCancelable(true); //if you set this false, the user will not be able to cancel the dialog by clicking BACK button
//  alertDialogBuilder.setMessage("You haven't set the quantity!");
    /*alertDialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
        }
    });

    alertDialogBuilder.show(); //don't forget to show the dialog! It is a common mistake.
   */

    Button btnCancel = (Button) dialog.findViewById(R.id.Button_Cancel);
    btnCancel.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            dialog.dismiss();
        }
    });

    dialog.show();

}

its working...:)

How to change the Android AlertDialog selection background color

See below code for style:

<style name="MyDialogTheme" parent="Theme.AppCompat.Light.Dialog.Alert">
    <item name="android:background">@color/myColor</item>
</style>

Now this style apply on dialog:

AlertDialog alertDialog = new AlertDialog.Builder(getContext(), R.style.MyDialogTheme)

Android: How can I change AlertDialog Title Text Color and Background Color without using custom layout?

You can use custom title to your alert dialog:

TextView textView = new TextView(context);
textView.setText("Select an option");
textView.setPadding(20, 30, 20, 30);
textView.setTextSize(20F);
textView.setBackgroundColor(Color.CYAN);
textView.setTextColor(Color.WHITE);

final CharSequence[] items = {"Visiting Card", "Prescription Letter"};
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setCustomTitle(textView);
builder.setItems(items, (dialog, item) -> {
    }).show();

custom alert dialog background color

try to set dialog theme like this in styles.xml

<style name="dialogTheme" parent="android:Theme.Holo.Dialog">
    <item name="android:windowMinWidthMajor">90%</item>
    <item name="android:windowMinWidthMinor">90%</item>
</style>

java code

Dialog dialog = new Dialog(activity, R.style.dialogTheme);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.your_dialog_layout);
activity.getWindow().setLayout(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);

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

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