public void showDialog(final String title, final String message,
                       final OnClickListener onClickPositive,
                       final OnClickListener onCLickNegative, final String positiveButton,
                       final String negativeButton, final boolean cancelable) {
    if (!isFinishing()) {
        runOnUiThread(new Runnable() {

            @Override
            public void run() {

                if (dialog != null && dialog.isShowing()) {
                    dialog.cancel();
                }

                Builder builder;
                if (android.os.Build.VERSION.SDK_INT >= 14) {
                    builder = new AlertDialog.Builder(new ContextThemeWrapper(
                            MyActivity.this,
                            android.R.style.Theme_DeviceDefault_Light_Dialog));
                } else {
                    builder = new Builder(MyActivity.this);
                }

                if (title != null) {
                    builder.setTitle(title);
                }
                if (message != null) {
                    builder.setMessage(message);
                }

                if (positiveButton != null) {
                    builder.setPositiveButton(positiveButton, onClickPositive);
                }
                if (negativeButton != null) {
                    builder.setNegativeButton(negativeButton, onCLickNegative);
                }
                builder.setCancelable(cancelable);

                dialog = builder.show();
                colorizeDialog(dialog);
            }
        });
    }
}

//theme-xml
<style name="Theme.DeviceDefault.Light.Dialog" parent="Theme.Holo.Light.Dialog" >
    <item name="android:windowTitleStyle">@android:style/DialogWindowTitle.DeviceDefault.Light</item>
    <item name="android:windowAnimationStyle">@android:style/Animation.DeviceDefault.Dialog</item>

    <item name="android:buttonBarStyle">@android:style/DeviceDefault.Light.ButtonBar.AlertDialog</item>
    <item name="borderlessButtonStyle">@android:style/Widget.DeviceDefault.Light.Button.Borderless.Small</item>

    <item name="textAppearance">@android:style/TextAppearance.DeviceDefault.Light</item>
    <item name="textAppearanceInverse">@android:style/TextAppearance.DeviceDefault.Light.Inverse</item>
</style>