java - Zxing 二维码扫描仪自动关闭冲洗灯

Question

我已经集成了Zxing QR扫描仪库。这是我的 app/build.gradle

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);

因此，应用程序启动时，同花灯会打开。然后，我按下“启动 QR 扫描仪”按钮，启动 QR 扫描仪，然后我会得到预期的解析结果。

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扫描仪自动关闭冲洗灯(我的要求是在黑暗环境中扫描，所以灯是强制性的)

我还发布了我的日志的一部分:

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

如何保持同光灯打开？

Answer 1

IntentIntegrator 包含 torch 的配置。但这部分代码尚未发布，因此您必须使用 master 的快照构建。在所有发布的版本上配置相机时，CameraManager 似乎还会关闭手电筒灯。

未发布的方法

在开始扫描之前，只需调用

qrScan.setTorchEnabled(true);

您甚至可以使用音量键来操作手电筒，其中向上键打开。

请注意，手电筒可能会在任何扫描后关闭，因此可能不要使用 setFlushLight(cameraId[0], true) 处理它，而仅确保扫描以 torch 旗。