本文实例为大家分享了Android CameraManager类的具体代码，供大家参考，具体内容如下 先看代码： private SurfaceView mSurfaceView; private...SurfaceHolder mSurfaceHolder; private CameraManager cameraManager; cameraManager = new CameraManager...(mSurfaceHolder); cameraManager.startPreview(); } catch (IOException e) {...(); cameraManager.closeDriver(); } }); 自定义一个 CameraManager 类，在关闭当前页面，释放camera资源时偶尔报错...implements Camera.PreviewCallback { private static final String TAG = CameraManager.class.getName();
val cameraManager = activity.getSystemService(Context.CAMERA_SERVICE) as CameraManager val cameraId =...cameraManager.cameraIdList[0] cameraManager.openCamera(cameraId, object : CameraDevice.StateCallback...fun getFirstCameraIdFacing(cameraManager: CameraManager, facing: Int = CameraMetadata.LENS_FACING_BACK...fun filterCameraIdsFacing(cameraIds: Array, cameraManager: CameraManager,...: CameraManager, currCameraId: String?
camera.release(); 但在Android N（7.0）及以后，也许你就发现不灵了，那你就需要这样做了： 在Android（M）6.0 后，Android引入了新的API，对闪光灯的控制通过CameraManager...处理；首先简单的对两个类进行说明： （1）CameraManager.java： 可通过CameraManager manager = (CameraManager) getSystemService...手电筒操作 try { //获取CameraManager CameraManager mCameraManager = (CameraManager) MyApplication.getContext
) as CameraManager val cameraId = cameraManager.cameraIdList[0] cameraManager.openCamera(cameraId, object...检查摄像头列表和摄像头特性： val cameraIdList = cameraManager.cameraIdList // may be empty val characteristics = cameraManager.getCameraCharacteristics...我们可以将这样的一个逻辑包装成一个函数，它可以正确地处理上面提到的情况: fun getFirstCameraIdFacing(cameraManager: CameraManager,...Google 相机应用中切换摄像头按钮 要实现这个功能，尝试从CameraManager.getCameraIdList()提供的列表中选择下一个摄像头，但是这并不是个好的方式。...(CameraCharacteristics.LENS_FACING) == facing } } fun getNextCameraId(cameraManager: CameraManager
本课程内容由 @公众号：小驰笔记出品，欢迎关注公众号，获取更多交流信息 流程图： 1、获取当前设备支持摄像头颗数 CameraManager manager = (CameraManager) activity.getSystemService...(Context.CAMERA_SERVICE); manager.getCameraIdList(); 2、获取到对应摄像头的ID CameraManager manager = (CameraManager...& facing == CameraCharacteristics.LENS_FACING_BACK) { continue; } } 3、根据camera id打开摄像头 CameraManager...manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE); manager.openCamera(mCameraId...,获取camera服务 CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE)
示例： function isTorchSupported(cameraManager: camera.CameraManager): boolean { let isSupported = cameraManager.isTorchSupported...function isTorchModeSupported(cameraManager: camera.CameraManager, torchMode: camera.TorchMode): boolean...: camera.CameraManager): void { cameraManager.on('torchStatusChange', callback); } off('torchStatusChange...cameraManager 对象获取成功后可监听。...示例： function unregisterTorchStatusChange(cameraManager: camera.CameraManager): void { cameraManager.off
()); cameraManager.setCameraType(isSupportRecord ?...1 : 0); tv_flash.setVisibility(cameraManager.isSupportFlashCamera() ?...View.VISIBLE : View.GONE); rl_camera.setVisibility(cameraManager.isSupportFlashCamera() || cameraManager.isSupportFrontCamera...() || cameraManager.isSupportFrontCamera() ?...(CameraManager.class) { if (INSTANCE == null) { INSTANCE = new CameraManager(context); } } } return
public class MainActivity extends AppCompatActivity { protected boolean isopent = false; private CameraManager...super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); manager = (CameraManager...MainActivity extends AppCompatActivity { protected boolean isFlashLightOn = false; private CameraManager...isFlashLightOn); } }); } //callback成员变量初始化 private CameraManager.TorchCallback...mTorchCallback = new CameraManager.TorchCallback() { @Override public void onTorchModeChanged
核心类与组件： CameraManager：用于管理系统中的相机设备，提供了获取相机设备列表、打开指定相机以及获取相机特性等方法。...CameraCharacteristics：描述了特定相机设备所支持的各种特性，通过 CameraManager 获取。...使用步骤： 获取 CameraManager：首先需要获取 CameraManager 对象，这是进行所有相机操作的前提。...获取 CameraManager：通过Context.getSystemService(Context.CAMERA_SERVICE)获取 CameraManager 实例123。...cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE); try
/end } } //chch add start private void turnOffFlashLightIfNeed(){ try{ mCameraManager = (CameraManager...android.util.Log.d("chch", "camera error"); } } //chch end 前面要增加 import android.hardware.camera2.CameraManager...; 增加变量 CameraManager mCameraManager; String mCameraId; 总结 以上所述是小编给大家介绍的Android实现手电筒电源键关闭功能，希望对大家有所帮助
static boolean hasHighSpeedVideoConfigs(Context context, String cameraId) { try { CameraManager...cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE); CameraCharacteristics...characteristics = cameraManager.getCameraCharacteristics(cameraId); HighSpeedVideoConfiguration...cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE); CameraCharacteristics...characteristics = cameraManager.getCameraCharacteristics(cameraId); HighSpeedVideoConfiguration
CameraAccessException; import android.hardware.camera2.CameraCharacteristics; import android.hardware.camera2.CameraManager...; private SizeF getCameraResolution(int camNum) { SizeF size = new SizeF(0,0); CameraManager manager...= (CameraManager) getSystemService(Context.CAMERA_SERVICE); try { String[] cameraIds = manager.getCameraIdList
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, CAMERA_REQUEST_CODE); 获取目标Camera CameraManager...manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE); try { String...e.printStackTrace(); } 打开Camera: if (mCameraId == null) { return; } CameraManager...manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE); try { if (ActivityCompat.checkSelfPermission
初始化CameraManager在你的Activity或Fragment中，首先需要获取CameraManager的实例，这个类是用于管理设备上的相机资源：CameraManager cameraManager...= (CameraManager) getSystemService(Context.CAMERA_SERVICE);3....获取相机ID使用CameraManager的getCameraIdList()方法获取设备上所有可用的相机列表，并选择一个相机ID进行后续操作。...通常，后置摄像头的ID是"0"，前置摄像头的ID是"1"，但这不是绝对的，需要根据实际情况判断：try { String[] cameraIdList = cameraManager.getCameraIdList...打开相机使用CameraManager的openCamera()方法打开选定的相机。
一、写在前面 本文主要介绍在高通平台上，当设备枚举的Camera设备数超过2个的时候（我们正常的设备是前后摄2个，不过现在的手机基本都是3、4颗摄像头的了），那如何确保上层应用通过CameraManager...Conflicting Client Devices: {}) ] Allowed user IDs: 0 三、设置prop属性vendor.camera.aux.packagelist 在CameraManager.java...--------CameraManager.java public String[] getCameraIdList() { String[] cameraIds = null;...ICameraServiceListener.STATUS_ENUMERATING) continue; idCount++; } ...... } 从上面代码，我们可以看到，CameraManager
android和android-core的代码设计的不好，扩展性太差了（我在后期开发新需求的时候改修改了很多CameraManager的逻辑）。...6、设备兼容（针对低分辨率设备） CameraManager.java中有设置最小扫描框大小的参数MIN_FRAME_WIDTH和MIN_FRAME_HEIGHT。默认是320×240。...扫描框大小由CameraManager决定。修改的时候需要注意和CameraManager的配置关联起来，否则会出现扫描框和实际解码的区域不一致。...首先在CaptureActivity.java初始化cameraManager的地方，把 cameraManager = new CameraManager(getApplication()) 改为cameraManager...= new CameraManager(this) 这样做的目的是：传入了activity给CameraManager，使得后面在CameraManager中的调试内容可以直接输出在activity上
一、涉及到的关键类 CameraManager -------------- 获取连接的camera情况，执行打开摄像头的操作； CameraDevice -----------...height); configureTransform(width, height); Activity activity = getActivity(); CameraManager...manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE); try {...对Camera的操作，无非就是获取到硬件设备相关属性，比如当前挂载了哪些摄像头，摄像头支持哪些分辨率等属性，这个我们需要用到CameraManager来获取； 获取到Camera相关属性后，那么就需要对硬件设备进行操作...，操作就是打开Camera,获取预览数据这些了，通过CameraManager，我们能打开对应Id的camera,然后获取到该id对应的Camera设备实例，这个就是CameraDevice了； 那么接下来就是怎么怎么把
一、涉及到的关键类 CameraManager -------------- 获取连接的camera情况，执行打开摄像头的操作； CameraDevice...height); configureTransform(width, height); Activity activity = getActivity(); CameraManager...manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE); try {...对Camera的操作，无非就是获取到硬件设备相关属性，比如当前挂载了哪些摄像头，摄像头支持哪些分辨率等属性，这个我们需要用到CameraManager来获取； 获取到Camera相关属性后...，那么就需要对硬件设备进行操作，操作就是打开Camera,获取预览数据这些了，通过CameraManager，我们能打开对应Id的camera,然后获取到该id对应的Camera设备实例，这个就是CameraDevice
mHandler, mActivity.getCameraOpenErrorCallback()); // (1) public class CameraUtil { public static CameraManager.CameraProxy...openCamera( Activity activity, final int cameraId, Handler handler, final CameraManager.CameraOpenErrorCallback...CameraHolder { public synchronized CameraProxy open( Handler handler, int cameraId, CameraManager.CameraOpenErrorCallback...RELEASE_CAMERA); ………… return mCameraDevice; } } class AndroidCameraManagerImpl implements CameraManager...{ public CameraManager.CameraProxy cameraOpen( Handler handler, int cameraId, CameraOpenErrorCallback
CameraManager类中的getFramingRectInPreview()方法，将left， right， top， bottom改变。...至此，识别率已经很大程度上的提高了，若在要提高识别率，可通过修改CameraManager类中的MAX_FRAME_WIDTH和MAX_FRAME_HEIGHT来提高精度。
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