[IL34] Introduce InputLogicHandler

Bug: 8636060
Change-Id: I5d08ed5d69cdb03bd188e36b7014de03f04fa72f

java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java

@@ -71,6 +71,8 @@ public final class InputLogic {
     // TODO : Remove this member when we can.
     private final LatinIME mLatinIME;
 
+    private InputLogicHandler mInputLogicHandler;
+
     // TODO : make all these fields private as soon as possible.
     // Current space state of the input method. This can be any of the above constants.
     public int mSpaceState;
@@ -105,6 +107,7 @@ public final class InputLogic {
         mWordComposer = new WordComposer();
         mEventInterpreter = new EventInterpreter(latinIME);
         mConnection = new RichInputConnection(latinIME);
+        mInputLogicHandler = null;
     }
 
     /**
@@ -119,12 +122,15 @@ public final class InputLogic {
      * @param restarting whether input is starting in the same field as before.
      */
     public void startInput(final boolean restarting) {
+        mInputLogicHandler = new InputLogicHandler();
     }
 
     /**
      * Clean up the input logic after input is finished.
      */
     public void finishInput() {
+        mInputLogicHandler.destroy();
+        mInputLogicHandler = null;
     }
 
     /**

java/src/com/android/inputmethod/latin/inputlogic/InputLogicHandler.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.inputlogic;
+
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Message;
+
+/**
+ * A helper to manage deferred tasks for the input logic.
+ */
+// TODO: Make this package private
+public class InputLogicHandler implements Handler.Callback {
+    final Handler mNonUIThreadHandler;
+
+    public InputLogicHandler() {
+        final HandlerThread handlerThread = new HandlerThread(
+                InputLogicHandler.class.getSimpleName());
+        handlerThread.start();
+        mNonUIThreadHandler = new Handler(handlerThread.getLooper(), this);
+    }
+
+    public void destroy() {
+        mNonUIThreadHandler.getLooper().quit();
+    }
+
+    /**
+     * Handle a message.
+     * @see android.os.Handler.Callback#handleMessage(android.os.Message)
+     */
+    @Override
+    public boolean handleMessage(final Message msg) {
+        return true;
+    }
+}