codice Java
AlertDialog.Builder builder =
new AlertDialog.Builder(SecondActivity.this, R.style.AppCompatAlertDialogStyle);
builder.setTitle("SCRUM");
builder.setMessage("In the SCRUM methodology a sprint is the basic unit of development. Each sprint is preceded by a planning meeting, where the tasks for the sprint are identified and an estimated commitment for the sprint goal is made, and followed by a review or retrospective meeting where the progress is reviewed and lessons for the next sprint are identified. During each sprint, the team creates finished portions of a product.....");
builder.setPositiveButton("OK", null);//second parameter used for onclicklistener
builder.setNegativeButton("Cancel", null);
builder.show();
utilizzare questo tema
<style name="AppCompatAlertDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
<item name="colorAccent">#FFCC00</item>
<item name="android:textColorPrimary">#FFFFFF</item>
<item name="android:background">#5fa3d0</item>
</style>
Importa supporto v7 avviso dialogo
import android.support.v7.app.AlertDialog;
output come questo,

fonte
2015-06-22 08:20:14
Vedere la mia risposta alla tua altra domanda che sarà probabilmente funziona per te http://stackoverflow.com/questions/26595128/appcompat-dialog-theme-with-mis-colored-titlebar -bug/27069935 – Mick