android 检测外接键盘并设置输入法布局

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-permission android:name="android.permission.SET_KEYBOARD_LAYOUT" />
<!-- 开机自动启动 -->
<receiver android:name=".Receiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
    <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.DEFAULT"/> 
            </intent-filter>
        </receiver>
<!-- 监听服务 -->
  <service android:name=".KeyboardService">
            <intent-filter>
    <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/> 
            </intent-filter>
        </service>

import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import com.zed.keyboardDeviceReceiver.*;
public class Receiver extends BroadcastReceiver {
  @Override
  public void onReceive(Context context, Intent intent) {
  // TODO Auto-generated method stub
  Intent i = new Intent(context, KeyboardService.class);
  i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  context.startService(i);
  }
}
import android.app.Service;
import android.os.IBinder;
import android.content.Context;
import android.view.InputDevice;
import android.os.Handler;
import android.content.Intent;
import android.os.Message;
import android.content.res.Configuration;
import android.hardware.input.InputManager;
public class KeyboardService extends Service implements InputManager.InputDeviceListener{
  private InputManager mIm;
  private Context context;
  public void onCreate(){
  super.onCreate();
  context = getApplicationContext();
  }
  @Override
  public void onStart(Intent intent, int startId) {
  // TODO Auto-generated method stub
  super.onStart(intent, startId);
   mIm = (InputManager)context.getSystemService(Context.INPUT_SERVICE);
   mIm.registerInputDeviceListener(this, null);//添加监听
  int[] ids = mIm.getInputDeviceIds();//非常重要, 决定后续是否能监听到状态变化
  }
  @Override
  public void onConfigurationChanged(Configuration newConfig) {
  // TODO Auto-generated method stub
  //doNothing
android.util.Log.d("KeyboardService", "0410 onConfigurationChanged");
  }
  public void onDestroy(){
  super.onDestroy();
  mIm.unregisterInputDeviceListener(this);//注销监听
  }
  public IBinder onBind(android.content.Intent intent){
  return null;
  }
    public void onInputDeviceAdded(int deviceId){
android.util.Log.d("KeyboardService", "0410 > onInputDeviceAdded()");
  final int[] devices = InputDevice.getDeviceIds();//获取设备
  for (int i = 0; i < devices.length; i++) {//遍历查找
          InputDevice device = InputDevice.getDevice(devices[i]);
                if (device != null
                        && !device.isVirtual()
                        && device.isFullKeyboard()) {
                    final String inputDeviceDescriptor = device.getDescriptor();
                    final String keyboardLayoutDescriptor =
                            mIm.getCurrentKeyboardLayoutForInputDevice(inputDeviceDescriptor);
                    mIm.addKeyboardLayoutForInputDevice(inputDeviceDescriptor,
                            "com.android.inputdevices/com.android.inputdevices.InputDeviceReceiver/keyboard_layout_french");//添加布局
      mIm.setCurrentKeyboardLayoutForInputDevice(inputDeviceDescriptor,
                        "com.android.inputdevices/com.android.inputdevices.InputDeviceReceiver/keyboard_layout_french");//更改布局
                }
            }
  }
    public void onInputDeviceRemoved(int deviceId){
  android.util.Log.d("KeyboardService", "0410 > onInputDeviceRemoved()");
  }
    public void onInputDeviceChanged(int deviceId){
  android.util.Log.d("KeyboardService", "0410 > onInputDeviceChanged()");
  }
}