Android 连接蓝牙扫码器无输入框的实现

@Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        InputDevice inputDevice = event.getDevice();
        if (inputDevice != null) {
            int keyboardType = event.getDevice().getKeyboardType();
            String deviceName = event.getDevice().getName();
            boolean isVirtual = event.getDevice().isVirtual();
            //可以根据输入设备信息判断是否为特定扫码器输入
            if (!isVirtual) {
                scannerHelper.onScanerInput(event);
            }
        }
    }

public class ScannerHelper {
    private String buffer ="";
    private MainOneActivity mainOneActivity;
    public ScannerHelper(MainOneActivity mainOneActivity){
        this.mainOneActivity = mainOneActivity;
    }
    public void onScanerInput(KeyEvent event){
        if(event.getKeyCode() == KeyEvent.KEYCODE_ENTER){
            mainOneActivity.onScannerResult(buffer);//回调扫码结果
            buffer="";
        }else{
            if (event.getAction() == KeyEvent.ACTION_UP && event.isPrintingKey()){
                buffer +=  (char)event.getUnicodeChar();
            }
        }
    }
}