硬件系列（八）---------使用AccessibilityService服务进行无界面扫码枪扫码获取数据

一、DetectionService 服务类

public class DetectionService extends AccessibilityService {

    final static String TAG = "DetectionService";
    private ScanGun mScanGun = null;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }

    @Override
    public void onAccessibilityEvent(AccessibilityEvent arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onInterrupt() {
        // TODO Auto-generated method stub

    }

    @Override
    protected boolean onKeyEvent(KeyEvent event) {
        // TODO Auto-generated method stub
        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            int keyCode = event.getKeyCode();
            if (keyCode <= 6) {
                return false;
            }
            if (mScanGun.isMaybeScanning(keyCode, event)) {
                return true;
            }
        }
        return super.onKeyEvent(event);
    }

    @Override
    public void onCreate() {
        mScanGun = new ScanGun(new ScanGun.ScanGunCallBack() {

            @Override
            public void onScanFinish(String scanResult) {
                if (!TextUtils.isEmpty(scanResult)) {

                    Toast.makeText(DetectionService.this.getBaseContext(),
                            "无界面监听扫描枪数据:" + scanResult, Toast.LENGTH_SHORT).show();
                    LogUtil.e("无界面监听扫描枪数据:" + scanResult);
                }
            }
        });
        ScanGun.setMaxKeysInterval(50);
        super.onCreate();
    }

}

二、配置信息

<!--扫码配置-->
<service
    android:name=".hardware.service.DetectionService"
    android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
    <intent-filter>
        <action android:name="android.accessibilityservice.AccessibilityService" />
    </intent-filter>

    <meta-data
        android:name="android.accessibilityservice"
        android:resource="@xml/detection_service_config" />
</service>

• detection_service_config.xml文件

<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
    android:accessibilityEventTypes="typeAllMask"
    android:accessibilityFeedbackType="feedbackGeneric"
    android:accessibilityFlags="flagRequestFilterKeyEvents"
    android:canRequestFilterKeyEvents="true"
    android:canRetrieveWindowContent="true"
    android:description="@string/accessibility_service_description"
    android:notificationTimeout="100" />

<string name="accessibility_service_description">Listen to USB scanner input</string>

<!--扫码权限-->
<uses-permission
    android:name="android.permission.BIND_ACCESSIBILITY_SERVICE"
    tools:ignore="ProtectedPermissions" />

三、使用方法

Intent service = new Intent(this, DetectionService.class);
startService(service);

注意：使用这个服务，必须要系统设置--》无障碍--》服务  在服务中在到你的软件，要打开这个服务才能使用，要不就使用不了