Fixed several dialog theming issues

Change-Id: I8e83e5a35acaae63a70bef48f543e3fd82ced354

core/java/com/android/internal/app/AlertController.java

@@ -30,6 +30,7 @@ import android.os.Handler;
 import android.os.Message;
 import android.text.TextUtils;
 import android.util.AttributeSet;
+import android.util.TypedValue;
 import android.view.Gravity;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
@@ -165,6 +166,13 @@ public class AlertController {
         }
     }
 
+    private static boolean shouldCenterSingleButton(Context context) {
+        TypedValue outValue = new TypedValue();
+        context.getTheme().resolveAttribute(com.android.internal.R.attr.alertDialogCenterButtons,
+                outValue, true);
+        return outValue.data != 0;
+    }
+
     public AlertController(Context context, DialogInterface di, Window window) {
         mContext = context;
         mDialogInterface = di;
@@ -508,16 +516,18 @@ public class AlertController {
             whichButtons = whichButtons | BIT_BUTTON_NEUTRAL;
         }
 
-        /*
-         * If we only have 1 button it should be centered on the layout and
-         * expand to fill 50% of the available space.
-         */
-        if (whichButtons == BIT_BUTTON_POSITIVE) {
-            centerButton(mButtonPositive);
-        } else if (whichButtons == BIT_BUTTON_NEGATIVE) {
-            centerButton(mButtonNeutral);
-        } else if (whichButtons == BIT_BUTTON_NEUTRAL) {
-            centerButton(mButtonNeutral);
+        if (shouldCenterSingleButton(mContext)) {
+            /*
+             * If we only have 1 button it should be centered on the layout and
+             * expand to fill 50% of the available space.
+             */
+            if (whichButtons == BIT_BUTTON_POSITIVE) {
+                centerButton(mButtonPositive);
+            } else if (whichButtons == BIT_BUTTON_NEGATIVE) {
+                centerButton(mButtonNeutral);
+            } else if (whichButtons == BIT_BUTTON_NEUTRAL) {
+                centerButton(mButtonNeutral);
+            }
         }
         
         return whichButtons != 0;

core/res/res/values/attrs.xml

@@ -351,6 +351,7 @@
         <eat-comment />
         <attr name="alertDialogStyle" format="reference" />
         <attr name="alertDialogButtonGroupStyle" format="reference" />
+        <attr name="alertDialogCenterButtons" format="boolean" />
 
         <!-- ============ -->
         <!-- Panel styles -->

core/res/res/values/themes.xml

@@ -143,6 +143,7 @@
         <item name="dialogTheme">@android:style/Theme.Dialog</item>
         <item name="alertDialogTheme">@android:style/Theme.Dialog.Alert</item>
         <item name="alertDialogButtonGroupStyle">?android:attr/buttonGroupStyle</item>
+        <item name="alertDialogCenterButtons">true</item>
         
         <!-- Panel attributes -->
         <item name="panelBackground">@android:drawable/menu_background</item>
@@ -590,7 +591,7 @@
     </style>
 
     <!-- @hide -->
-    <style name="Theme.Dialog.AppError">
+    <style name="Theme.Dialog.AppError" parent="Theme.Holo.Dialog">
         <item name="windowFrame">@null</item>
         <item name="windowTitleStyle">@android:style/DialogWindowTitle</item>
         <item name="windowBackground">@android:color/transparent</item>
@@ -754,6 +755,7 @@
         <item name="dialogTheme">@android:style/Theme.Holo.Dialog</item>
         <item name="alertDialogTheme">@android:style/Theme.Holo.Dialog.Alert</item>
         <item name="alertDialogButtonGroupStyle">@android:style/Widget.Holo.ButtonGroup.AlertDialog</item>
+        <item name="alertDialogCenterButtons">false</item>
         
         <!-- Panel attributes -->
         <item name="panelBackground">@android:drawable/menu_background</item>