Question

使用Camera2类时，我在调用openCamera()方法时遇到以下异常：

W/System.err: java.lang.SecurityException
W/System.err:     at android.os.BinderProxy.transactNative(Native Method)
W/System.err:     at android.os.BinderProxy.transact(Binder.java:503)
W/System.err:     at android.hardware.ICameraService$Stub$Proxy.connectDevice(ICameraService.java:364)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at android.hardware.camera2.utils.Decorator.invoke(Decorator.java:80)
W/System.err:     at java.lang.reflect.Proxy.invoke(Proxy.java:393)
W/System.err:     at $Proxy0.connectDevice(Unknown Source)
W/System.err:     at android.hardware.camera2.CameraManager.openCameraDeviceUserAsync(CameraManager.java:321)
W/System.err:     at android.hardware.camera2.CameraManager.openCamera(CameraManager.java:457)
....

以下是我的明确内容＆amp;实施代码。

的Manifest.xml

<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera2" />
<application>
//
</application>

打开相机的代码：

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
        try {
            String camIds[] = cameraManager.getCameraIdList();
            if (camIds.length > 0) {
                cameraManager.openCamera(camIds[0], new CameraDevice.StateCallback() {
                    @Override
                    public void onOpened(CameraDevice cameraDevice) {
                        Log.d(TAG, "Camera opened");
                    }

                    @Override
                    public void onDisconnected(CameraDevice cameraDevice) {
                        Log.d(TAG, "Camera disconnected");
                    }

                    @Override
                    public void onError(CameraDevice cameraDevice, int i) {
                        Log.d(TAG, "Error access camera");
                    }
                }, null);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
}

即使重新启动设备，代码也会引发异常。

我在Samsung Galaxy S6和Android 6.0.1。有人指出我错过了什么？

Answer 1

您的代码应为：

if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED) {
     ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, CAMERA_PERMISSION);
} else {
      try {
            String camIds[] = cameraManager.getCameraIdList();
            if (camIds.length > 0) {
                cameraManager.openCamera(camIds[0], new CameraDevice.StateCallback() {
                    @Override
                    public void onOpened(CameraDevice cameraDevice) {
                        Log.d(TAG, "Camera opened");
                    }

                    @Override
                    public void onDisconnected(CameraDevice cameraDevice) {
                        Log.d(TAG, "Camera disconnected");
                    }

                    @Override
                    public void onError(CameraDevice cameraDevice, int i) {
                        Log.d(TAG, "Error access camera");
                    }
                }, null);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
}

Camera2的openCamera（）抛出SecurityException

1 个答案: