【发布时间】：2014-03-01 18:12:55
【问题描述】：
我在我的 Android 应用中创建了一个自定义相机活动，但我遇到了图像根据拍摄设备旋转 90 度的问题。这只发生在特定设备上，我似乎无法弄清楚为什么。
我在应用中所做的是
- 更新变量“mOrientation”，以度 (0-360) 为单位保存手机的当前方向
- 当用户点击快门按钮时，我会检查上次保存的方向，并在保存之前相应地旋转图像。
我在两种不同的设备上进行了测试，华为手机和三星 Galaxy S II。我发现虽然我能够确定手机的方向正在正确更新并且两者都有默认的纵向方向，但它们需要不同的“mOrientation”值，偏移 90 度，以便保存时方向正确。
这是我检查当前方向的方法：
public void onOrientationChanged(int orientation) {
if(cameraPreview.getDeviceDefaultOrientation() == Configuration.ORIENTATION_PORTRAIT){
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;
}
}
}else{
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 { // orientation <135 && orientation > 45
if (mOrientation != ORIENTATION_PORTRAIT_NORMAL) {
mOrientation = ORIENTATION_PORTRAIT_NORMAL;
}
}
}
这是我保存图像的方式：
private PictureCallback myPictureCallback_JPG = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera cam) {
Log.d(TAG, "saving picture");
Log.d(TAG, "portrait image? " + Boolean.toString(cameraPreview.getDeviceDefaultOrientation() == Configuration.ORIENTATION_PORTRAIT));
Log.d(TAG, "mOrientaiton: " + mOrientation);
//Degrees to rotate image by when saving
int degree = 0;
// do not rotate image, just put rotation info in
if(cameraPreview.getDeviceDefaultOrientation() == Configuration.ORIENTATION_PORTRAIT){
switch (mOrientation) {
case ORIENTATION_LANDSCAPE_INVERTED:
Log.d(TAG, "orientation landscape inverted");
degree = 90;
break;
case ORIENTATION_PORTRAIT_NORMAL:
Log.d(TAG, "orientation portrait normal");
degree = 0;
break;
case ORIENTATION_LANDSCAPE_NORMAL:
Log.d(TAG, "orientation landscape normal");
degree = 270;
break;
case ORIENTATION_PORTRAIT_INVERTED:
Log.d(TAG, "orientation portrait inverted");
degree = 180;
break;
}
}else{
switch (mOrientation) {
case ORIENTATION_LANDSCAPE_INVERTED:
degree = 270;
break;
case ORIENTATION_PORTRAIT_NORMAL:
degree = 180;
break;
case ORIENTATION_LANDSCAPE_NORMAL:
degree = 0;
break;
case ORIENTATION_PORTRAIT_INVERTED:
degree = 90;
break;
}
}
Bitmap bMap;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 6;
options.inDither = false; // Disable Dithering mode
options.inPurgeable = true; // Tell to gc that whether it needs free
// memory, the Bitmap can be cleared
options.inInputShareable = true; // Which kind of reference will be
// used to recover the Bitmap
// data after being clear, when
// it will be used in the future
options.inTempStorage = new byte[32 * 1024];
options.inPreferredConfig = Bitmap.Config.RGB_565;
bMap = BitmapFactory.decodeByteArray(data, 0, data.length, options);
if(degree != 0){
bMap = rotate(bMap, degree);
}
//Getting the picture's unique file to be added to the folder
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
/*
* This catches errors when creating the output file to put the picture in
*/
if (pictureFile == null) {
Log.d(TAG,"Error creating media file, check storage permissions");
//After the camera has finished taking the picture
handler.post(new Runnable(){
@Override
public void run() {
//Remove white border from preview
Log.d(TAG, "removing white background from preview");
cameraPreview.setBackgroundResource(0);
}
});
//Setting the onclicklistener back on the shutter
shutter.setOnClickListener(shutterClickListener);
//Restarting the preview as soon as picture is done
camera.startPreview();
Toast.makeText(getApplicationContext(), "Error saving file. Try restarting the camera.", Toast.LENGTH_LONG).show();
return;
}
FileOutputStream out = null;
try {
//Saving the image
out = new FileOutputStream(pictureFile);
bMap.compress(Bitmap.CompressFormat.JPEG, 90, out);
if (bMap != null) {
bMap.recycle();
bMap = null;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}finally{
try {
//Assuring we always close the output stream
if(out!=null){
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
myHorizontalLayout.add(Uri.parse(pictureFile.getPath()));
MediaScannerConnection.scanFile(getApplicationContext(), new String[] { Environment.getExternalStorageDirectory().toString() }, null, new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri)
{
Log.i("ExternalStorage", "Scanned " + path + ":");
Log.i("ExternalStorage", "-> uri=" + uri);
camera.startPreview();
if(myHorizontalLayout.getItemList().size() == 1){
//Have added the first item to the pictures set check to green
MenuItem check = menu.findItem(R.id.save);
}
//After the camera has finished taking the picture
handler.post(new Runnable(){
@Override
public void run() {
//Remove white border from preview
Log.d(TAG, "removing white background");
cameraPreview.setBackgroundResource(0);
}
});
//Setting the onclicklistener back on the shutter
shutter.setOnClickListener(shutterClickListener);
}
});
}
};
如果有人能帮我解决这个问题，我将不胜感激。此外，如果有人对如何在无需拥有许多不同品牌的手机的情况下跨 Android 设备测试相机配置有一般性建议，我也将不胜感激。
【问题讨论】：
标签： android camera rotation android-camera