android調用camera時，可以自己寫一個activity，賦上相關參數，打開前camera就可以了； 需要申請的permission，在AndroidManifest.xml中添加： 主要功能，打開前camera private Camera openFrontFacingCameraGingerbread() { int cameraCount = 0; Camera cam = null; Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); cameraCount = Camera.getNumberOfCameras(); for (int camIdx = 0; camIdx < cameraCount; camIdx++) { Camera.getCameraInfo(camIdx, cameraInfo); if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) { try { cam = Camera.open(camIdx); mCurrentCamIndex = camIdx; } catch (RuntimeException e) { Log.e(TAG, "Camera failed to open: " + e.getLocalizedMessage()); } } } return cam; } 根據打開時的橫豎屏方向來調整preview角度 //根據橫豎屏自動調節preview方向，Starting from API level 14, this method can be called when preview is active. private static void setCameraDisplayOrientation(Activity activity,int cameraId, Camera camera) { Camera.CameraInfo info = new Camera.CameraInfo(); Camera.getCameraInfo(cameraId, info); int rotation = activity.getWindowManager().getDefaultDisplay().getRotation(); //degrees the angle that the picture will be rotated clockwise. Valid values are 0, 90, 180, and 270. //The starting position is 0 (landscape). int degrees = 0; switch (rotation) { case Surface.ROTATION_0: degrees = 0; break; case Surface.ROTATION_90: degrees = 90; break; case Surface.ROTATION_180: degrees = 180; break; case Surface.R