从图像类Java android创建firebase vision图像
因此,我试图用谷歌ML工具包创建一个条形码扫描仪,该扫描仪使用android内置摄像头扫描二维码,但FirebasevisionImage类获取了一个media.image,我不知道如何创建它。这是我的密码 公共类QrActivity扩展了AppCompatActivity实现了SurfaceHolder.Callback{从图像类Java android创建firebase vision图像,java,android,image,barcode-scanner,firebase-mlkit,Java,Android,Image,Barcode Scanner,Firebase Mlkit,因此,我试图用谷歌ML工具包创建一个条形码扫描仪,该扫描仪使用android内置摄像头扫描二维码,但FirebasevisionImage类获取了一个media.image,我不知道如何创建它。这是我的密码 公共类QrActivity扩展了AppCompatActivity实现了SurfaceHolder.Callback{ private static final String TAG = "QrActivity"; SurfaceView surfaceView = findViewByI
private static final String TAG = "QrActivity";
SurfaceView surfaceView = findViewById(R.id.cameraView);
SurfaceHolder holder = surfaceView.getHolder();
CameraManager cameraManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_qr);
}
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
surfaceHolder = this.holder ;
try {
Image myimage = cameraManager.openCamera(1,);
getRotationCompensation(getCameraId(),QrActivity.this,getApplicationContext());
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent,1);
FirebaseVisionImage image = FirebaseVisionImage.fromMediaImage(reader, getRotationCompensation(getCameraId(),QrActivity.this,getApplicationContext()));
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
还有一个获取和返回相机id的方法,并创建一个sparseInt数组来获取相机旋转
private String getCameraId(){
String mCameraId = null;
CameraManager cameraManager =(CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
for(String cameraId:cameraManager.getCameraIdList()){
CameraCharacteristics cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
if(cameraCharacteristics.get(CameraCharacteristics.LENS_FACING)==1){
mCameraId = cameraId;
return mCameraId;
}
}
} catch (CameraAccessException e) {
e.printStackTrace();
}
return mCameraId;
}
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_90, 0);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
但我想知道的是如何使条形码扫描仪与设备摄像头配合使用
参考看起来您使用的是android.hardware.camera2 API,设置起来确实有点困难。请参阅camera2文档,但简而言之,您可以使用android.media.ImageReader并要求camera2 API将图像渲染到其“表面”,并从ImageReader.OnImageAvailableListener获取媒体.image
ML Kit正在改进Quick Start应用程序,使其包含camera2示例代码。请继续关注。谢谢。Thank you@Isabella。实际上,我使用google vision api使其正常工作,该api很快就会被弃用,但它现在已经完成了工作。