【发布时间】：2012-08-18 08:31:26
【问题描述】：
我的相机应用有问题。相机活动处于纵向模式。所以我给了
camera.setDisplayOrientation(90);
根据 SO 中的不同帖子，这将在纵向模式下正常工作。
但它在不同的设备上永远无法正常工作。问题是，预览向左或向右旋转 90 度。在 Htc 中没关系。但是对于银河系列，它不起作用。
谁能帮帮我？
【问题讨论】：
标签： android orientation android-camera
【发布时间】：2012-08-18 08:31:26
【问题描述】：
按以下不同方式设置方向和预览，按要求使用：
第一种方法：
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
{
if (isPreviewRunning)
{
mCamera.stopPreview();
}
Parameters parameters = mCamera.getParameters();
Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
if(display.getRotation() == Surface.ROTATION_0)
{
parameters.setPreviewSize(height, width);
mCamera.setDisplayOrientation(90);
}
if(display.getRotation() == Surface.ROTATION_90)
{
parameters.setPreviewSize(width, height);
}
if(display.getRotation() == Surface.ROTATION_180)
{
parameters.setPreviewSize(height, width);
}
if(display.getRotation() == Surface.ROTATION_270)
{
parameters.setPreviewSize(width, height);
mCamera.setDisplayOrientation(180);
}
mCamera.setParameters(parameters);
previewCamera();
}
和
public void previewCamera()
{
try
{
mCamera.setPreviewDisplay(mSurfaceHolder);
mCamera.startPreview();
isPreviewRunning = true;
}
catch(Exception e)
{
Log.d(APP_CLASS, "Cannot start preview", e);
}
}
第二种方式：
private Camera mCamera;
private OrientationEventListener mOrientationEventListener;
private int mOrientation = -1;
private static final int ORIENTATION_PORTRAIT_NORMAL = 1;
private static final int ORIENTATION_PORTRAIT_INVERTED = 2;
private static final int ORIENTATION_LANDSCAPE_NORMAL = 3;
private static final int ORIENTATION_LANDSCAPE_INVERTED = 4;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// force Landscape layout
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR | ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
/*
Your other initialization code here
*/
}
@Override
protected void onResume() {
super.onResume();
if (mOrientationEventListener == null) {
mOrientationEventListener = new OrientationEventListener(this, SensorManager.SENSOR_DELAY_NORMAL) {
@Override
public void onOrientationChanged(int orientation) {
// determine our orientation based on sensor response
int lastOrientation = mOrientation;
if (orientation >= 315 || orientation < 45) {
if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {
mOrientation = ORIENTATION_PORTRAIT_NORMAL;
}
}
else if (orientation < 315 && orientation >= 225) {
if (mOrientation != ORIENTATION_LANDSCAPE_NORMAL) {
mOrientation = ORIENTATION_LANDSCAPE_NORMAL;
}
}
else if (orientation < 225 && orientation >= 135) {
if (mOrientation != ORIENTATION_PORTRAIT_INVERTED) {
mOrientation = ORIENTATION_PORTRAIT_INVERTED;
}
}
else { // orientation <135 && orientation > 45
if (mOrientation != ORIENTATION_LANDSCAPE_INVERTED) {
mOrientation = ORIENTATION_LANDSCAPE_INVERTED;
}
}
if (lastOrientation != mOrientation) {
changeRotation(mOrientation, lastOrientation);
}
}
};
}
if (mOrientationEventListener.canDetectOrientation()) {
mOrientationEventListener.enable();
}
}
@Override protected void onPause() {
super.onPause();
mOrientationEventListener.disable();
}
/**
* Performs required action to accommodate new orientation
* @param orientation
* @param lastOrientation
*/
private void changeRotation(int orientation, int lastOrientation) {
switch (orientation) {
case ORIENTATION_PORTRAIT_NORMAL:
mSnapButton.setImageDrawable(getRotatedImage(android.R.drawable.ic_menu_camera, 270));
mBackButton.setImageDrawable(getRotatedImage(android.R.drawable.ic_menu_revert, 270));
Log.v("CameraActivity", "Orientation = 90");
break;
case ORIENTATION_LANDSCAPE_NORMAL:
mSnapButton.setImageResource(android.R.drawable.ic_menu_camera);
mBackButton.setImageResource(android.R.drawable.ic_menu_revert);
Log.v("CameraActivity", "Orientation = 0");
break;
case ORIENTATION_PORTRAIT_INVERTED:
mSnapButton.setImageDrawable(getRotatedImage(android.R.drawable.ic_menu_camera, 90));
mBackButton.setImageDrawable(getRotatedImage(android.R.drawable.ic_menu_revert, 90));
Log.v("CameraActivity", "Orientation = 270");
break;
case ORIENTATION_LANDSCAPE_INVERTED:
mSnapButton.setImageDrawable(getRotatedImage(android.R.drawable.ic_menu_camera, 180));
mBackButton.setImageDrawable(getRotatedImage(android.R.drawable.ic_menu_revert, 180));
Log.v("CameraActivity", "Orientation = 180");
break;
}
}
/**
* Rotates given Drawable
* @param drawableId Drawable Id to rotate
* @param degrees Rotate drawable by Degrees
* @return Rotated Drawable
*/
private Drawable getRotatedImage(int drawableId, int degrees) {
Bitmap original = BitmapFactory.decodeResource(getResources(), drawableId);
Matrix matrix = new Matrix();
matrix.postRotate(degrees);
Bitmap rotated = Bitmap.createBitmap(original, 0, 0, original.getWidth(), original.getHeight(), matrix, true);
return new BitmapDrawable(rotated);
}
然后在您的 PictureCallback 中设置元数据以指示旋转级别：
private Camera.PictureCallback mJpegCallback = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
try {
// Populate image metadata
ContentValues image = new ContentValues();
// additional picture metadata
image.put(Media.DISPLAY_NAME, [picture name]);
image.put(Media.MIME_TYPE, "image/jpg");
image.put(Media.TITLE, [picture title]);
image.put(Media.DESCRIPTION, [picture description]);
image.put(Media.DATE_ADDED, [some time]);
image.put(Media.DATE_TAKEN, [some time]);
image.put(Media.DATE_MODIFIED, [some time]);
// do not rotate image, just put rotation info in
switch (mOrientation) {
case ORIENTATION_PORTRAIT_NORMAL:
image.put(Media.ORIENTATION, 90);
break;
case ORIENTATION_LANDSCAPE_NORMAL:
image.put(Media.ORIENTATION, 0);
break;
case ORIENTATION_PORTRAIT_INVERTED:
image.put(Media.ORIENTATION, 270);
break;
case ORIENTATION_LANDSCAPE_INVERTED:
image.put(Media.ORIENTATION, 180);
break;
}
// store the picture
Uri uri = getContentResolver().insert(
Media.EXTERNAL_CONTENT_URI, image);
try {
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0,
data.length);
OutputStream out = getContentResolver().openOutputStream(
uri);
boolean success = bitmap.compress(
Bitmap.CompressFormat.JPEG, 75, out);
out.close();
if (!success) {
finish(); // image output failed without any error,
// silently finish
}
现在，当基于横向的设备出现时，需要在 OrientationEventListener 中对其进行额外检查。
Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
if (display.getOrientation() == Surface.ROTATION_0) {
// landscape oriented devices
} else {
// portrait oriented device
}
完整代码（LC有点浪费，但很容易演示该方法）
@Override
public void onOrientationChanged(int orientation) {
// determine our orientation based on sensor response
int lastOrientation = mOrientation;
Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
if (display.getOrientation() == Surface.ROTATION_0) { // landscape oriented devices
if (orientation >= 315 || orientation < 45) {
if (mOrientation != ORIENTATION_LANDSCAPE_NORMAL) {
mOrientation = ORIENTATION_LANDSCAPE_NORMAL;
}
} else if (orientation < 315 && orientation >= 225) {
if (mOrientation != ORIENTATION_PORTRAIT_INVERTED) {
mOrientation = ORIENTATION_PORTRAIT_INVERTED;
}
} else if (orientation < 225 && orientation >= 135) {
if (mOrientation != ORIENTATION_LANDSCAPE_INVERTED) {
mOrientation = ORIENTATION_LANDSCAPE_INVERTED;
}
} else if (orientation <135 && orientation > 45) {
if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {
mOrientation = ORIENTATION_PORTRAIT_NORMAL;
}
}
} else { // portrait oriented devices
if (orientation >= 315 || orientation < 45) {
if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {
mOrientation = ORIENTATION_PORTRAIT_NORMAL;
}
} else if (orientation < 315 && orientation >= 225) {
if (mOrientation != ORIENTATION_LANDSCAPE_NORMAL) {
mOrientation = ORIENTATION_LANDSCAPE_NORMAL;
}
} else if (orientation < 225 && orientation >= 135) {
if (mOrientation != ORIENTATION_LANDSCAPE_INVERTED) {
mOrientation = ORIENTATION_LANDSCAPE_INVERTED;
}
} else if (orientation <135 && orientation > 45) {
if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {
mOrientation = ORIENTATION_PORTRAIT_NORMAL;
}
}
} else { // portrait oriented devices
if (orientation >= 315 || orientation < 45) {
if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {
mOrientation = ORIENTATION_PORTRAIT_NORMAL;
}
} else if (orientation < 315 && orientation >= 225) {
if (mOrientation != ORIENTATION_LANDSCAPE_NORMAL) {
mOrientation = ORIENTATION_LANDSCAPE_NORMAL;
}
} else if (orientation < 225 && orientation >= 135) {
if (mOrientation != ORIENTATION_PORTRAIT_INVERTED) {
mOrientation = ORIENTATION_PORTRAIT_INVERTED;
}
} else if (orientation <135 && orientation > 45) {
if (mOrientation != ORIENTATION_LANDSCAPE_INVERTED) {
mOrientation = ORIENTATION_LANDSCAPE_INVERTED;
}
}
}
if (lastOrientation != mOrientation) {
changeRotation(mOrientation, lastOrientation);
}
}
第三种方式：
private Bitmap adjustImageOrientation(Bitmap image) {
ExifInterface exif;
try {
exif = new ExifInterface(picturePath);
int exifOrientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
int rotate = 0;
switch (exifOrientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
rotate = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotate = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
rotate = 270;
break;
}
if (rotate != 0) {
int w = image.getWidth();
int h = image.getHeight();
// Setting pre rotate
Matrix mtx = new Matrix();
mtx.preRotate(rotate);
// Rotating Bitmap & convert to ARGB_8888, required by tess
image = Bitmap.createBitmap(image, 0, 0, w, h, mtx, false);
}
} catch (IOException e) {
return null;
}
return image.copy(Bitmap.Config.ARGB_8888, true);
}
【讨论】：
我给这个answer 提供了一个类似的问题，但正如你所说，它是在 HTC 设备上。我建议您在旋转代码中添加断点并在物理旋转设备时检查变量 - 这可能有助于识别 Galaxy 模型的不同之处。
【讨论】：
检查是否在手机设置中选中了“自动旋转屏幕”选项（设置 > 显示或屏幕 - 取决于 android 版本）。
【讨论】：
刚刚发布了一个对我有用的新解决方案。
基本上你可以从 Camera.CameraInfo 中获取方向值。这将告诉您需要在 setDisplayOrientation 上使用的度数，以便正确显示图像。使用后置摄像头时，您可以简单地使用 setDisplayOrientation 并检索到值，但是当使用前置摄像头时，您需要稍微调整一下，因为 Android 系统会翻转图像，使其看起来像镜子。
以下代码对我有用，并在 4 种不同的设备上进行了测试，包括 Nexus6 和 Galaxy。
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
int cameraCount = Camera.getNumberOfCameras();
int camIdx = 0; // DO your logic to get front or back camera...or loop through all avaialable.
Camera.getCameraInfo(camIdx, cameraInfo);
try {
mCamera = Camera.open(camIdx);
// If using back camera then simply rotate what CameraInfo tells you.
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK)
mCamera.setDisplayOrientation(cameraInfo.orientation);
else
// If using front camera note that image might be flipped to give users the impresion the are looking at a mirror.
mCamera.setDisplayOrientation( (360 - cameraInfo.orientation) % 360);
} catch (Exception e) {
e.printStackTrace();
}
【讨论】：