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：

        <uses-permission android:name="android.permission.CAMERA" />
	<uses-feature android:name="android.hardware.camera" android:required="false" />
	<uses-feature android:name="android.hardware.camera.front" android:required="false" />
	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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

android 调用前摄像头进行拍照的方法及完整例子