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这个想法很简单:我的应用程序应该创建一个摄像头对象,显示预览并拍照(不按任何按钮),然后关闭摄像头。不幸的是,它甚至没有拍照。 (意思是:我的回调代码应在拍摄照片后执行)永远不会达到。)android:摄像头不拍摄
我正在为android相机api使用一个小包装类。我的活动代码如下所示:
camera = new SurveillanceCamera(this, layoutForPreview);
camera.start();
camera.takePicture();
包装类:
public SurveillanceCamera(Context context, LinearLayout previewLayout) {
cameraInstance = Camera.open(findBackFacingCamera());
pictureCallback = getPictureCallback();
cameraPreview = new CameraPreview(context, cameraInstance);
this.previewLayout = previewLayout;
this.previewLayout.addView(cameraPreview);
cameraInstance.startPreview();
}
public void takePicture() {
//this code is reached
cameraInstance.takePicture(null, null, pictureCallback);
}
public void start() {
if (cameraInstance == null) {
cameraInstance = Camera.open(findBackFacingCamera());
pictureCallback = getPictureCallback();
cameraPreview.setCamera(cameraInstance);
cameraInstance.startPreview();
}
}
private PictureCallback getPictureCallback() {
PictureCallback picture = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
Log.e(TAG, "Jey picture was taken...");
// refresh camera to continue preview
cameraPreview.refreshCamera(cameraInstance);
}
};
return picture;
}
private int findBackFacingCamera() {
int cameraId = -1;
// Search for the back facing camera
// get the number of cameras
int numberOfCameras = Camera.getNumberOfCameras();
// for every camera check
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
cameraId = i;
break;
}
}
return cameraId;
}
没有例外的代码中引发,但在onPictureTaken的Log.e()不显示。看起来,相机预览显示,但没有任何反应。是否有可能,执行camera.takePicture()时,预览未完全加载?有什么建议么?
http://examples.javacodegeeks.com/android/core/hardware/camera-hardware/android-camera-example/&http://www.tutorialspoint.com/android/android_camera.htm –
对不起,但那是不是一个非常有用的答案。我已经检查了很多教程。我的相机正在拍照,如果我只是使用一个按钮来触发camera.takePicture()方法。但如果我试图直接拍摄照片,如上所示,它不起作用。为什么?以及如何在没有按钮触发事件的情况下拍照? –