Do not allow draw on top for default sms picker.

Fixes: 120484087
Test: manual
Change-Id: I4be265565678302fad207839216d5cd65dcb6e94

src/com/android/settings/SmsDefaultDialog.java

@@ -16,6 +16,8 @@
 
 package com.android.settings;
 
+import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
+
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -30,6 +32,8 @@ import android.text.TextUtils;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.Window;
+import android.view.WindowManager;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;
@@ -59,6 +63,21 @@ public final class SmsDefaultDialog extends AlertActivity implements
         }
     }
 
+    @Override
+    protected void onStart() {
+        super.onStart();
+        getWindow().addSystemFlags(SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
+    }
+
+    @Override
+    protected void onStop() {
+        super.onStop();
+        final Window window = getWindow();
+        final WindowManager.LayoutParams attrs = window.getAttributes();
+        attrs.privateFlags &= ~SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
+        window.setAttributes(attrs);
+    }
+
     @Override
     public void onClick(DialogInterface dialog, int which) {
         switch (which) {