android 调用前摄像头进行拍照的方法及完整例子

android调用camera时，可以自己写一个activity，赋上相关参数，打开前camera就可以了；

需要申请的permission，在AndroidManifest.xml中添加：

主要功能，打开前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;}

根据打开时的横竖屏方向来调整preview角度

//根据横竖屏自动调节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.ROTATION_270: degrees = 270; break;          }             int result;         if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT)       {                   result = (info.orientation + degrees) % 360;                result = (360 - result) % 360;  // compensate the mirror          }        else        {         // back-facing                 result = (info.orientation - degrees + 360) % 360;          }            camera.setDisplayOrientation(result);  }

本博文关联的源码下载： http://download.csdn.net/detail/changliangdoscript/7446287

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