下面是一个简单的示例代码,用于判断当前相机是否被使用: importandroid.hardware.Camera;publicclassCameraUtils{publicstaticbooleanisCameraInUse(){Cameracamera=null;try{camera=Camera.open();}catch(Exceptione){// 相机被其他应用程序使用,或者无法访问相机returntrue;}finally{if(camera!=null){camera.release();...
// Camera is not available (in use or does not exist) } return c; // returns null if camera is unavailable } Android 2.3之后,可以使用Camera.open(int)来获取特定的相机。 检查相机特性 可以使用Camera.getParameters()方法来检查相机的特性。 API Level 9之后,可以使用Camera.getCameraInfo()来查看相...
If your application can use a camera or camera feature for proper operation, but does not require it, you should specify this in the manifest by including the android:required attribute, and setting it to false: <uses-feature android:name="android.hardware.camera" android:required="false" />...
*/ public static Camera getCameraInstance(){ Camera c = null; try { c = Camera.open(); // attempt to get a Camera instance } catch (Exception e){ // Camera is not available (in use or does not exist) } return c; // returns null if camera is unavailable }12345678910111234567891011...
* example, if the camera is still in use by another process). */publicnativefinalvoidlock(); lock()方法是一个native方法 注释的大概意思是 调用这个方法重新锁定相机以防止其他进程访问它。系统默认的状态就是locked状态,可以调用unlock()或者reconnect()来使用 ...
open(); try { // 绑定摄像头和预览用SurfaceView myCamera.setPreviewDisplay(mySurfaceHolder); Log.d(TestTag, "camera create!"); }catch(Exception e) { if(null != myCamera) { myCamera.release(); myCamera = null; } Log.d(TestTag, "catch in surface created" + e.getMessage()); } ...
Camera c =null;try{ c = Camera.open();// attempt to get a Camera instance}catch(Exception e){// Camera is not available (in use or does not exist)}returnc;// returns null if camera is unavailable} 注意:使用Camera.open()时始终检查异常。如果相机正在使用或不存在,则无法检查异常,将导致...
int ERROR_CAMERA_SERVICE 由onError(CameraDevice, int)报告的错误代码,表明摄像机服务遇到了一个致命错误。 int ERROR_MAX_CAMERAS_IN_USE 由onError(CameraDevice, int)报告的错误代码,表明相机设备无法打开,因为有太多其他的开放相机设备。 回调方法解释 onClosed(CameraDevice camera) 当一个相机设备CameraDevice...
1. Use the Android Device Manager to set the Camera settings to Webcam0 UPDATE In Android Studio AVD: Open AVD Manager: Add/Edit AVD: Click Advanced Settings in the bottom of the screen: Set your camera of choice as the front/back cameras: 2. Launch the macOS Terminal 3. In th...
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