Android输入法扩展之远程输入法

近年来，互联网电视开始火热，乐视TV，小米TV，最近爱奇艺也在大肆的招人做爱奇艺电视，当然还有更被关注的苹果电视。其实，这个趋势很正常，也很合理，传统单纯的接收电视节目的电视已经太传统了，是该被革命了。乐视为代表的新一代互联网电视采取互联网的营销方式，不需要实体店，不需要实体工厂，只需方案，服务，网上预约，直接快递等方式大大降低了成本，同时也可以控制库存，预防风险。同时他们都坚持硬件不赚钱，服务收费，更看重电视用户对象这一潜在价值。用户多了，干啥都方便，当然还有更大的智能家居大概念。

       除了苹果电视，其他无一不是采用Android系统。但是各种互联网电视说到底它还是电视，不像手机，平板，PC等这些电子产品，用户离它是有距离的，用户是没法直接触摸屏幕等方式来输入的，因此Android软键盘方式实在是不够好的输入交互方式。对于英语系的国家，这个电视的输入还好解决，只需通过外接键盘直接输入，但是对于类似中文这种需要转换的语种来说，就麻烦了。这是因为Android外接键盘只能输入英文字符，同时输入法又没法获取外接键盘(只支持触摸软键盘的字符)的输入将其转化为中文。这就让我想到标题的“远程输入法”。

       一个很通用的场景就是：电视安装了爱踢门的远程输入法，该输入法连接上了手机的远程输入端，然后用户在远程输入程序中用自身的输入法(搜狗输入法)输入，然后输入的内容就实时的传送到电视里的程序中了。

远程输入法机制

        远程输入法的机制很简单：做一个特殊的输入法，该输入法不再通过触摸软键盘获得输入字符，而是通过网络直接从网络的另一端获取字符(这个字符可以是英文，也可以是中文，任意语系都可以)，然后将这个字符发送给应用程序。输入的核心是两个:InputConnection的commitText和sendKeyEvent两个接口，如下代码实现：

     

[java] view plaincopy

1. private void sendText(String text) {  
2.     if (!isShow()) {  
3.         Log.d(TAG, "ime is hidden");  
4.        return;  
5.     }  
6.      final InputConnection ic = getCurrentInputConnection();  
7.      if(ic == null) {  
8.         Log.d(TAG, "ic null");  
9.          return;  
10.      }  
11.      //将中文等任一语系文本发送给程序  
12.      ic.commitText(text, text.length());  
13.  }  
14.    
15.  public void sendDownUpKeyEvents(int keyEventCode) {  
16.      InputConnection ic = getCurrentInputConnection();  
17.      if (ic == null) return;  
18.      long eventTime = SystemClock.uptimeMillis();  
19.      //发送delete，backspace删除字符等特殊输入，特殊输入是通过key来实现的哦  
20.      ic.sendKeyEvent(new KeyEvent(eventTime, eventTime,  
21.              KeyEvent.ACTION_DOWN, keyEventCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,  
22.              KeyEvent.FLAG_SOFT_KEYBOARD|KeyEvent.FLAG_KEEP_TOUCH_MODE));  
23.      ic.sendKeyEvent(new KeyEvent(SystemClock.uptimeMillis(), eventTime,  
24.              KeyEvent.ACTION_UP, keyEventCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,  
25.              KeyEvent.FLAG_SOFT_KEYBOARD|KeyEvent.FLAG_KEEP_TOUCH_MODE));  
26.  }  

       

     然后就是代码的大头，网络模块：实现局域网搜索服务，自动连接，网络数据发送。

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