Android: How to set the colour of a Toast's text

You can achieve this very easily, without creating a custom layout by modifying the default Toast :

Toast toast = Toast.makeText(this, resId, Toast.LENGTH_SHORT);
TextView v = (TextView) toast.getView().findViewById(android.R.id.message);
v.setTextColor(Color.RED);
toast.show();

You can find the layout used by the default toast view in the Android SDK :

$ANDROID-SDK$/platforms/android-8/data/res/layout/transient_notification.xml

You can create a custom Toast view to suit your requirements. See the section titled "Creating a Custom Toast View" at http://developer.android.com/guide/topics/ui/notifiers/toasts.html

You may want to create a custom Toast

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/toast_layout_root"
          android:orientation="horizontal"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:padding="10dp"
          android:background="#DAAA"
          >
<ImageView android:id="@+id/image"
           android:layout_width="wrap_content"
           android:layout_height="fill_parent"
           android:layout_marginRight="10dp"
           />
<TextView android:id="@+id/text"
          android:layout_width="wrap_content"
          android:layout_height="fill_parent"
          android:textColor="#FFF"
          />
</LinearLayout>

-

LayoutInflater inflater = getLayoutInflater();
View layout = inflater.inflate(R.layout.toast_layout,
                           (ViewGroup) findViewById(R.id.toast_layout_root));

ImageView image = (ImageView) layout.findViewById(R.id.image);
image.setImageResource(R.drawable.android);
TextView text = (TextView) layout.findViewById(R.id.text);
text.setText("Hello! This is a custom toast!");

Toast toast = new Toast(getApplicationContext());
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(layout);
toast.show();

Source