Disable navbar searchlight if search assist not available.

Bug:7506441
Change-Id: I55c740d4c3a45b9f7fdfa38346d1bc3fb1299153

Author: John Spurlock

core/java/android/app/SearchManager.java

@@ -858,6 +858,9 @@ public Intent getAssistIntent(Context context) {
      */
     public Intent getAssistIntent(Context context, int userHandle) {
         try {
+            if (mService == null) {
+                return null;
+            }
             ComponentName comp = mService.getAssistIntent(userHandle);
             if (comp == null) {
                 return null;

policy/src/com/android/internal/policy/impl/keyguard/KeyguardViewMediator.java

@@ -22,6 +22,7 @@
 import android.app.ActivityManagerNative;
 import android.app.AlarmManager;
 import android.app.PendingIntent;
+import android.app.SearchManager;
 import android.app.StatusBarManager;
 import android.content.BroadcastReceiver;
 import android.content.ContentResolver;
@@ -166,6 +167,9 @@ public class KeyguardViewMediator {
     /** UserManager for querying number of users */
     private UserManager mUserManager;
 
+    /** SearchManager for determining whether or not search assistant is available */
+    private SearchManager mSearchManager;
+
     /**
      * Used to keep the device awake while to ensure the keyguard finishes opening before
      * we sleep.
@@ -527,6 +531,7 @@ public KeyguardViewMediator(Context context, LockPatternUtils lockPatternUtils)
      * Let us know that the system is ready after startup.
      */
     public void onSystemReady() {
+        mSearchManager = (SearchManager) mContext.getSystemService(Context.SEARCH_SERVICE);
         synchronized (this) {
             if (DEBUG) Log.d(TAG, "onSystemReady");
             mSystemReady = true;
@@ -1313,6 +1318,9 @@ private void adjustStatusBarLocked() {
                     // showing secure lockscreen; disable ticker.
                     flags |= StatusBarManager.DISABLE_NOTIFICATION_TICKER;
                 }
+                if (!isAssistantAvailable()) {
+                    flags |= StatusBarManager.DISABLE_SEARCH;
+                }
             }
 
             if (DEBUG) {
@@ -1410,4 +1418,8 @@ public void handleShowAssistant() {
         mKeyguardViewManager.showAssistant();
     }
 
+    private boolean isAssistantAvailable() {
+        return mSearchManager != null
+                && mSearchManager.getAssistIntent(mContext, UserHandle.USER_CURRENT) != null;
+    }
 }