Camera2使用方法例子代码

public class Cam2 {String tag = "seeker";CameraManager camMgr;String sCameraID = "";CameraDevice cam ;public void init(Context ctx){camMgr = (CameraManager) ctx.getSystemService(Context.CAMERA_SERVICE);try {//获取可用摄像头列表for (String cameraId : camMgr.getCameraIdList()) {//获取相机的相关参数CameraCharacteristics characteristics = camMgr.getCameraCharacteristics(cameraId);// 不使用前置摄像头。Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);Log.i(tag, "facing:" + facing);if (facing != null && facing == CameraCharacteristics.LENS_FACING_FRONT) {sCameraID = cameraId;break;}StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);if (map == null) {continue;}// 检查闪光灯是否支持。//Boolean available = characteristics.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);}} catch (CameraAccessException e) {e.printStackTrace();} catch (NullPointerException e) {//不支持Camera2API}imgReader = ImageReader.newInstance(640, 480, ImageFormat.YUV_420_888, 5);imgReader.setOnImageAvailableListener(new OnImageAvailableListener() {@Overridepublic void onImageAvailable(ImageReader reader) {Image image = reader.acquireNextImage();Log.i(tag, "-- " + image.getFormat() + " " + image);image.close();}}, null);}ImageReader imgReader = null;public void open(final Surface outputTarget){try {camMgr.openCamera(sCameraID, new StateCallback() {@Overridepublic void onOpened(CameraDevice camera) {// TODO Auto-generated method stubLog.i(tag, "cam onOpened:" + camera);cam = camera;try {final Builder builder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);builder.addTarget(outputTarget);builder.addTarget(imgReader.getSurface());// 自动对焦应builder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);camera.createCaptureSession(Arrays.asList(outputTarget, imgReader.getSurface()), new CameraCaptureSession.StateCallback() {@Overridepublic void onConfigured(CameraCaptureSession session) {try {// 开启相机预览并添加事件CaptureRequest mPreviewRequest = builder.build();//发送请求session.setRepeatingRequest(mPreviewRequest, null, null);} catch (CameraAccessException e) {e.printStackTrace();}}@Overridepublic void onConfigureFailed(CameraCaptureSession session) {}}, null);} catch (CameraAccessException e) {e.printStackTrace();}}@Overridepublic void onError(CameraDevice camera, int error) {// TODO Auto-generated method stubLog.i(tag, "cam onError:" + error);camera.close();cam = null;}@Overridepublic void onDisconnected(CameraDevice camera) {// TODO Auto-generated method stubLog.i(tag, "cam onDisconnected:" + camera);camera.close();cam = null;}}, new Handler(new Callback() {@Overridepublic boolean handleMessage(Message msg) {Log.i(tag, "cam msg:" + msg);return false;}}));} catch (CameraAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public void close(Surface outputTarget){if(cam != null){try {Builder builder = cam.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);builder.removeTarget(outputTarget);} catch (CameraAccessException e) {e.printStackTrace();}cam.close();}}
}

public class MainActivity extends Activity {private Cam2 cam2 = new Cam2();SurfaceView surfaceView ;SurfaceHolder surfaceHolder;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);surfaceView = (SurfaceView) findViewById(R.id.surface);surfaceHolder = surfaceView.getHolder();surfaceHolder.addCallback(surfaceCb);cam2.init(this);}SurfaceHolder.Callback surfaceCb = new Callback() {@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {cam2.close(holder.getSurface());}@Overridepublic void surfaceCreated(SurfaceHolder holder) {cam2.open(holder.getSurface());}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}};
}

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Camera2使用方法例子代码

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