android 检测外接键盘并设置输入法布局

需求:

接入外接键盘后, 系统输入语言自动变更为法语键盘

实现:

监听外接设备变更 > 查询是否包含全键盘设备 > 变更输入法布局

<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>

开机启动服务:

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 {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubIntent 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();}@Overridepublic void onStart(Intent intent, int startId) {// TODO Auto-generated method stubsuper.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}@Overridepublic void onConfigurationChanged(Configuration newConfig) {// TODO Auto-generated method stub//doNothingandroid.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()");}}

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