Add shell command to trigger ECBM mode
Fix EmergencyCallBackMode dialog Overlaid issue

Test: manual
Bug: 178821491
Change-Id: I731531d2d717e18e17f035262cd92d58d1f39ff9
Merged-In: I731531d2d717e18e17f035262cd92d58d1f39ff9
diff --git a/src/com/android/phone/EmergencyCallbackModeExitDialog.java b/src/com/android/phone/EmergencyCallbackModeExitDialog.java
index 591f435..adba850 100644
--- a/src/com/android/phone/EmergencyCallbackModeExitDialog.java
+++ b/src/com/android/phone/EmergencyCallbackModeExitDialog.java
@@ -16,6 +16,8 @@
 
 package com.android.phone;
 
+import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
+
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.Dialog;
@@ -74,7 +76,7 @@
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-
+        getWindow().addPrivateFlags(SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
         mPhone = PhoneGlobals.getInstance().getPhoneInEcm();
         // Check if phone is in Emergency Callback Mode. If not, exit.
         if (mPhone == null || !mPhone.isInEcm()) {