How can I change the color of AlertDialog title an

Question

I changed the color of an AlertDialog title using this command

alert.setTitle( Html.fromHtml("<font color='#FF7F27'>Set IP Address</font>"));

But I want to change the color of the line that appear under the title; how can I do that ?

Note: I don't want to use a custom layout

Answer 1

This will set the color for the title, icon, and divider. Bound to change with any new Android version.

public static void colorAlertDialogTitle(AlertDialog dialog, int color) {
    int dividerId = dialog.getContext().getResources().getIdentifier("android:id/titleDivider", null, null);
    if (dividerId != 0) {
        View divider = dialog.findViewById(dividerId);
        divider.setBackgroundColor(color);
    }

    int textViewId = dialog.getContext().getResources().getIdentifier("android:id/alertTitle", null, null);
    if (textViewId != 0) {
        TextView tv = (TextView) dialog.findViewById(textViewId);
        tv.setTextColor(color);
    }

    int iconId = dialog.getContext().getResources().getIdentifier("android:id/icon", null, null);
    if (iconId != 0) {
        ImageView icon = (ImageView) dialog.findViewById(iconId);
        icon.setColorFilter(color);
    }
}

Remember to call dialog.show() before calling this method.

Answer 2

Instead of using divider in dialog, use the view in the custom layout and set the layout as custom layout in dialog.

custom_popup.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">

    <com.divago.view.TextViewMedium
        android:id="@+id/txtTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:paddingBottom="10dp"
        android:paddingTop="10dp"
        android:text="AlertDialog"
        android:textColor="@android:color/black"
        android:textSize="20sp" />

    <View
        android:id="@+id/border"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_below="@id/txtTitle"
        android:background="@color/txt_dark_grey" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/border"
        android:scrollbars="vertical">

        <com.divago.view.TextViewRegular
            android:id="@+id/txtPopup"
            android:layout_margin="15dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </ScrollView>
</RelativeLayout>

activity.java:

public void showPopUp(String title, String text) {

    LayoutInflater inflater = getLayoutInflater();
    View alertLayout = inflater.inflate(R.layout.custom_popup, null);

    TextView txtContent = alertLayout.findViewById(R.id.txtPopup);
    txtContent.setText(text);

    TextView txtTitle = alertLayout.findViewById(R.id.txtTitle);
    txtTitle.setText(title);

    AlertDialog.Builder alert = new AlertDialog.Builder(this);
    alert.setView(alertLayout);
    alert.setCancelable(true);

    alert.setPositiveButton("Done", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });

    AlertDialog dialog = alert.create();
    dialog.show();
}