我正在使用Google视觉创建条形码读取应用程序,它还包含一个Flash On / Off功能。由于现在不赞成使用“ Camera”,因此我可以使用“ CameraManager”实现以下代码中的闪光灯。但是,当相机屏幕打开时,闪光灯不起作用。当相机冻结时(当检测到条形码时,停止camerasource),闪光灯正在工作。但是我想打开/关闭闪光灯而没有打开或关闭相机视图。我需要在不使用不推荐使用的API的情况下完成此操作。有人可以告诉我如何解决此问题。预先感谢。
private void setupBarcode(){
cameraPreview = (SurfaceView) findViewById(R.id.cameraPreview);
txtResult = findViewById(R.id.txtResult);
barcodeDetector = new BarcodeDetector.Builder(this)
.setBarcodeFormats(Barcode.ALL_FORMATS)
.build();
cameraSource = new CameraSource
.Builder(this, barcodeDetector)
.setAutoFocusEnabled(true)
.build();
//Add Event
cameraPreview.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
if (ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
//Request permission
ActivityCompat.requestPermissions(ScanActivity.this,
new String[]{Manifest.permission.CAMERA}, RequestCameraPermissionID);
return;
}
try {
cameraSource.start(cameraPreview.getHolder());
txtResult.setText("");
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
cameraSource.stop();
}
});
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
@Override
public void release() {
}
@Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
final SparseArray<Barcode> qrcodes = detections.getDetectedItems();
if (qrcodes.size() != 0) {
txtResult.post(new Runnable() {
@Override
public void run() {
okButton.setEnabled(true);
txtResult.setText(qrcodes.valueAt(0).displayValue);
cameraSource.stop();
}
});
}
}
});
}
private void flashLightOn() {
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
String cameraId = cameraManager.getCameraIdList()[0];
cameraManager.setTorchMode(cameraId, true);
} catch (CameraAccessException e) {
}
}
答案 0 :(得分:0)
使用项目中goole视觉库中的开源“ CameraSource.java”文件。 Get file from here
然后使用以下代码:
public void switchFlashLight(boolean status) {
cameraSource.setFlashMode(status ? Camera.Parameters.FLASH_MODE_TORCH : Camera.Parameters.FLASH_MODE_OFF);
}