使用android camera2 API显示摄像头源

概述我正在尝试创建一个非常简单的应用程序,显示从显示器上的相机收到的图片.我正在使用camera2 API,因为我是新手,所以我尝试使用最新的技术. 我达到了我称之为createCaptureSession()的程度,但随后onConfigureFailed()被调用,我不知道问题是什么或如何找到它. 这是我的来源： SurfaceView mSurfaceView;@Overrideprote 我正在尝试创建一个非常简单的应用程序,显示从显示器上的相机收到的图片.我正在使用camera2 API,因为我是新手,所以我尝试使用最新的技术.

我达到了我称之为createCaptureSession()的程度,但随后onConfigureFailed()被调用,我不知道问题是什么或如何找到它.

这是我的来源：

SurfaceVIEw mSurfaceVIEw;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    Log.d(TAG,"onCreate() start");    setContentVIEw(R.layout.activity_main);    mSurfaceVIEw = (SurfaceVIEw) findVIEwByID(R.ID.surfaceVIEw);}protected voID onResume() {    super.onResume();    Log.d(TAG,"onResume() start");    initCamera();}private voID initCamera() {    Log.d(TAG,"initCamera() start");    CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);    Log.d(TAG,"acquired cameraManager: " + cameraManager);    String[] cameraIDList;    try {        cameraIDList = cameraManager.getCameraIDList();    } catch (CameraAccessException e) {        Log.e(TAG,"Couldn't get camera List",e);        return;    }    Log.d(TAG,"acquired cameraIDList: length: " + cameraIDList.length);    if (cameraIDList.length == 0) {        Log.w(TAG,"Couldn't detect a camera");        return;    }    String camera0ID = cameraIDList[0];    Log.d(TAG,"chosen camera: " + camera0ID);    try {        cameraManager.openCamera(camera0ID,deviceCallback,null);    } catch (CameraAccessException e) {        Log.e(TAG,"Couldn't open camera",e);    }    Log.d(TAG,"called cameraManager.openCamera()");}CameraDevice.StateCallback deviceCallback = new CameraDevice.StateCallback() {    @OverrIDe    public voID onopened(CameraDevice camera) {        Log.d(TAG,"deviceCallback.onopened() start");        Surface surface = mSurfaceVIEw.getHolder().getSurface();        Log.d(TAG,"surface: " + surface);        List<Surface> surfaceList = Collections.singletonList(surface);        try {            camera.createCaptureSession(surfaceList,sessionCallback,null);        } catch (CameraAccessException e) {            Log.e(TAG,"Couldn't create capture session for camera: " + camera.getID(),e);            return;        }    }    @OverrIDe    public voID ondisconnected(CameraDevice camera) {        Log.d(TAG,"deviceCallback.ondisconnected() start");    }    @OverrIDe    public voID onError(CameraDevice camera,int error) {        Log.d(TAG,"deviceCallback.onError() start");    }};CameraCaptureSession.StateCallback sessionCallback = new CameraCaptureSession.StateCallback() {    @OverrIDe    public voID onConfigured(CameraCaptureSession session) {        Log.i(TAG,"capture session configured: " + session);    }    @OverrIDe    public voID onConfigureFailed(CameraCaptureSession session) {        Log.e(TAG,"capture session configure Failed: " + session);    }};

输出是：

...﹕ onCreate() start...﹕ onResume() start...﹕ initCamera() start...﹕ acquired cameraManager: androID.harDWare.camera2.CameraManager@5d68786...﹕ acquired cameraIDList: length: 2...﹕ chosen camera: 0...﹕ called cameraManager.openCamera()...﹕ deviceCallback.onopened() start...﹕ surface: Surface(name=null)/@0x52c91e3...﹕ capture session configure Failed: androID.harDWare.camera2.impl.CameraCaptureSessionImpl@1a8c7a99

以下是我的AndroIDManifest.xml：

<uses-permission androID:name="androID.permission.CAMERA" /><uses-feature androID:name="androID.harDWare.camera" /><uses-feature androID:name="androID.harDWare.camera2" />

解决方法 你应该设置预览的大小

mSurfaceVIEw.getHolder().setFixedSize(prevIEwSize.getWIDth(),prevIEwSize.getHeight());

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