让Camera在portrait模式下不旋转90度
由于Android自身的关系，camera必须在landscape模式下才可以显示正常，如果是在portrait模式下，就要把脖子转90度才能“正常”观看了
听说Android的SDK升级到1.5(cupcake)后已经可以解决这个问题了，就上网找了一下，发现有些人说可以尝试使用parameters.set("rotation", 90)，试了一下，无效。
最近由于项目原因，继续研究了下，找到了一个“曲线救国”的方法
parameters.set("orientation", "portrait");
由于这个方法没有出现在Android的官方的api文档中，所以可能会有些问题。。。吧
谁知道呢，先用着再说
（哎，这个方法被2.0毙了）
-----------------------更新-----------------------
通过反射，貌似可以解决预览
1.5 - OK
1.6 - OK
2.2 - OK
2.3 - OK
4.0 - OK
其余的没有测试，希望有能力的朋友帮忙测一下，然后给个结果
public class CameraView extends SurfaceView implements SurfaceHolder.Callback {/** * This is a holder that holding a display surface. */private SurfaceHolder mHolder = null;private int sdk = 3;/** * This is a camera object using for connect/disconnect with the camera * service,and so on. */private Camera mCamera;/** * Perform inflation from XML and apply a class-specific base style. This * constructor of View allows subclasses to use their own base style when * they are inflating. * * @param context * The Context the view is running in, through which it can * access the current theme, resources, etc. * @param attrs * The attributes of the XML tag that is inflating the view. * @param defStyle * The default style to apply to this view. If 0, no style will * be applied (beyond what is included in the theme). This may * either be an attribute resource, whose value will be retrieved * from the current theme, or an explicit style resource. */public CameraView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init();}/** * Constructor that is called when inflating a view from XML. This is called * when a view is being constructed from an XML file, supplying attributes * that were specified in the XML file. This version uses a default style of * 0, so the only attribute values applied are those in the Context's Theme * and the given AttributeSet. * * @param context * The Context the view is running in, through which it can * access the current theme, resources, etc. * @param attrs * The attributes of the XML tag that is inflating the view. */public CameraView(Context context, AttributeSet attrs) {super(context, attrs);init();}/** * Simple constructor to use when creating a view from code. * * @param context * The Context the view is running in, through which it can * access the current theme, resources, etc. */public CameraView(Context context) {super(context);init();}public void init() {if (mHolder == null) {mHolder = getHolder();mHolder.addCallback(this);mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);sdk = getSDKInt();}}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {try {// rotate camera 90 degree on portrait modeif (getContext().getResources().getConfiguration().orientation == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {if (sdk <= 4) {// 1.5 & 1.6Camera.Parameters parameters = mCamera.getParameters();parameters.set("orientation", "portrait");mCamera.setParameters(parameters);} else {setDisplayOrientation(mCamera, 90);}}} catch (Exception e) {e.printStackTrace();}startPreview();}/** * rotate camera with any degree, only available for SDK 5 and later * * @param camera * @param angle */private void setDisplayOrientation(Camera camera, int angle) {Method downPolymorphic;if (sdk <= 4)return;try {if (sdk > 4 && sdk < 8) {// parameters for pictures created by a Camera service.Camera.Parameters parameters = mCamera.getParameters();// 2.0, 2.1downPolymorphic = parameters.getClass().getMethod("setRotation", new Class[] { int.class });if (downPolymorphic != null)downPolymorphic.invoke(parameters, new Object[] { angle });// Sets the Parameters for pictures from this Camera// service.mCamera.setParameters(parameters);} else {downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });if (downPolymorphic != null)downPolymorphic.invoke(camera, new Object[] { angle });}} catch (Exception e) {}}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// get Camera object.try {mCamera = Camera.open();mCamera.setPreviewDisplay(holder);} catch (RuntimeException e) {e.printStackTrace();releaseCamera();} catch (IOException e) {e.printStackTrace();releaseCamera();}}public void stopPreview() {if (mCamera != null) {mCamera.stopPreview();}}public void startPreview() {if (mCamera != null) {mCamera.startPreview();}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {releaseCamera();}private void releaseCamera() {if (mCamera != null) {mCamera.stopPreview();mCamera.release();}mCamera = null;System.gc();}private int getSDKInt() {// this is safe so that we don't need to use SDKInt which is only// available after 1.6try {return Integer.parseInt(Build.VERSION.SDK);} catch (Exception e) {return 3; // default to target 1.5 cupcake}}} 1 楼 biAji 2010-03-21 http://code.google.com/p/android/issues/detail?id=1193 2 楼 dai_lm 2010-03-29 biAji 写道http://code.google.com/p/android/issues/detail?id=1193