diff --git a/core/java/com/android/internal/util/StateMachine.java b/core/java/com/android/internal/util/StateMachine.java
index 58d4aa7199e05..e547f238b770f 100644
--- a/core/java/com/android/internal/util/StateMachine.java
+++ b/core/java/com/android/internal/util/StateMachine.java
@@ -1601,6 +1601,19 @@ public class StateMachine {
         smh.sendMessage(obtainMessage(what, obj));
     }
 
+    /**
+     * Enqueue a message to this state machine.
+     *
+     * Message is ignored if state machine has quit.
+     */
+    public final void sendMessage(int what, int arg1, int arg2, Object obj) {
+        // mSmHandler can be null if the state machine has quit.
+        SmHandler smh = mSmHandler;
+        if (smh == null) return;
+
+        smh.sendMessage(obtainMessage(what, arg1, arg2, obj));
+    }
+
     /**
      * Enqueue a message to this state machine.
      *
@@ -1640,6 +1653,20 @@ public class StateMachine {
         smh.sendMessageDelayed(obtainMessage(what, obj), delayMillis);
     }
 
+    /**
+     * Enqueue a message to this state machine after a delay.
+     *
+     * Message is ignored if state machine has quit.
+     */
+    public final void sendMessageDelayed(int what, int arg1, int arg2, Object obj,
+            long delayMillis) {
+        // mSmHandler can be null if the state machine has quit.
+        SmHandler smh = mSmHandler;
+        if (smh == null) return;
+
+        smh.sendMessageDelayed(obtainMessage(what, arg1, arg2, obj), delayMillis);
+    }
+
     /**
      * Enqueue a message to this state machine after a delay.
      *
@@ -1681,6 +1708,20 @@ public class StateMachine {
         smh.sendMessageAtFrontOfQueue(obtainMessage(what));
     }
 
+    /**
+     * Enqueue a message to the front of the queue for this state machine.
+     * Protected, may only be called by instances of StateMachine.
+     *
+     * Message is ignored if state machine has quit.
+     */
+    protected final void sendMessageAtFrontOfQueue(int what, int arg1, int arg2, Object obj) {
+        // mSmHandler can be null if the state machine has quit.
+        SmHandler smh = mSmHandler;
+        if (smh == null) return;
+
+        smh.sendMessageAtFrontOfQueue(obtainMessage(what, arg1, arg2, obj));
+    }
+
     /**
      * Enqueue a message to the front of the queue for this state machine.
      * Protected, may only be called by instances of StateMachine.