众星二维码扫描仪自动关闭冲洗灯

Question

我集成了Zxing QR扫描仪库。这是我的应用程序/版本。格拉德尔

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
})
    compile 'com.android.support:appcompat-v7:26.0.0-alpha1'
    testCompile 'junit:junit:4.12'

    compile 'com.journeyapps:zxing-android-embedded:3.4.0'
    compile 'com.google.android.gms:play-services-appindexing:8.4.0'
}

在onCreate（）方法中，我有

mCameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
    try {
        cameraId = mCameraManager.getCameraIdList();
    } catch (CameraAccessException e) {
        Log.d("camera", "error");
    }
    setFlushLight(cameraId[0], true);

所以，当应用程序启动时，冲洗灯打开。然后我按下“启动QR扫描仪”按钮，启动QR扫描仪，我得到了预期的解析结果。

这是用于解析二维码的代码：

private IntentIntegrator qrScan;

//Getting the scan results
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
    String latestScannedData;

    if (result != null) {
        if (result.getContents() == null) {
            //if qrcode has nothing in it
            Toast.makeText(this, "Result Not Found", Toast.LENGTH_LONG).show();
        } else {
            //if qr contains data
            latestScannedData = result.getContents();
            latestScannedTime = System.currentTimeMillis();
            if (latestScannedData.equals(previousData)) {
                //if this data equals previous data
                //tell to remove the card
                if (latestScannedTime - previousScanTime > n * 1000) {
                    //if last scan was more than n seconds ago
                    t1.speak("Please remove the card", TextToSpeech.QUEUE_FLUSH, null);
                    previousData = "";
                }
                qrScan.initiateScan();
            } else {
                t1.speak("Access granted", TextToSpeech.QUEUE_FLUSH, null);
                qrScan.initiateScan();
                previousData = latestScannedData;
                previousScanTime = System.currentTimeMillis();
            }
            Log.d("qrresult", result.getContents());
        }
    } else {
        super.onActivityResult(requestCode, resultCode, data);
    }
}

我的问题是：

ZXing QR扫描仪会自动关闭闪光灯（我的要求是在黑暗环境中扫描，因此必须有灯光）

我还发布了日志的一部分：

D/CameraPreview: resume()
D/CameraInstance: Opening camera
D/CameraInstance: Configuring camera
I/CameraManager: Camera Display Orientation: 90

I/CameraConfiguration: Requesting focus mode value from among: [auto]
I/CameraConfiguration: Supported focus mode values: [auto, infinity, fixed, macro, continuous-video, continuous-picture, manual]
I/CameraConfiguration: Can set focus mode to: auto
I/CameraConfiguration: Focus mode already set to auto
I/CameraConfiguration: Requesting flash mode value from among: [off]
I/CameraConfiguration: Supported flash mode values: [off, auto, on, torch]
I/CameraConfiguration: Can set flash mode to: off
I/CameraConfiguration: Flash mode already set to off
I/PreviewScalingStrategy: Viewfinder size: 1920x1080
I/CameraPreview: Starting preview
D/CameraInstance: Starting preview
D/OpenGLRenderer: endAllStagingAnimators on 0x55a98da7b0 (RippleDrawable) with handle 0x55a9894a00
I/AutoFocusManager: Current focus mode 'auto'; use auto focus? true

我怎样才能保持齐平灯打开？

Answer 1

IntentIntegrator包含手电筒的配置。但是这部分代码尚未发布，因此您必须使用来自master的快照构建。在所有已发布的版本上配置相机时，相机管理器似乎也会关闭手电筒灯。

在开始扫描之前，只需调用

qrScan.setTorchEnabled(true);

您甚至可以使用音量键控制火炬，此时up处于打开状态。

请注意，在任何扫描之后，焊炬可能会关闭，因此可能不要使用setFlushLight（cameraId[0]，true）进行处理，只确保扫描从焊炬标志开始。