一、拍照照片被旋转上篇分享了Android调用系统相机和相册，但是由于国内Android机型繁多，各家都自己的rom，调用系统的还是会出现不少问题：
这种情况是使用Camera拍照以后，得到的照片会被自动旋转（90°、180°、270°）。解决方案：
1、读取图片的旋转属性
/**
* 读取图片的旋转的角度
*
* @param path
* 图片绝对路径
* @return 图片的旋转角度
*/private int getBitmapDegree(String path) {
int degree = 0;
try {
ExifInterface exifInterface = new ExifInterface(path);
int orientation = exifInterface.
getAttributeInt(ExifInterface.
TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
degree = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
degree = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
degree = 270;
break;
}
} catch (IOException e) {
e.printStackTrace();
} return degree;
}2、将图片按照某个角度进行旋转
/**
* 将图片按照某个角度进行旋转
*
* @param bm
* 需要旋转的图片
* @param degree
* 旋转角度
* @return 旋转后的图片
*/public static Bitmap rotateBitmapByDegree(Bitmap bm, int degree) {
Bitmap returnBm = null;
Matrix matrix = new Matrix();
matrix.postRotate(degree);
try {
returnBm = Bitmap.createBitmap(bm,
0, 0, bm.getWidth(), bm.getHeight(), matrix, true);
} catch (OutOfMemoryError e) {
} if (returnBm == null) {
returnBm = bm;
} if (bm != returnBm) {
bm.recycle();
} return returnBm;
}详见博客：https://www.baidufe.com/item/4bb733d9999c53cb8fed.html
二、调用系统相册，拿不到绝对路径上篇的方法，我在大部分手机测试是可行，但是一些机型还是拿不到，解决方案：
public class AbsolutePathUtil {
public static String getAbsolutePath(final Context context
, final Uri uri) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
&& DocumentsContract.isDocumentUri(context, uri)) {
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract
.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
}
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"),
Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
}
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract
.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images
.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video
.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio
.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[]{
split[1]
};
return getDataColumn(context, contentUri , selection, selectionArgs);
}
}
else if ("content".equalsIgnoreCase(uri.getScheme())) {
return getDataColumn(context, uri, null, null);
}
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
public static String getDataColumn(Context context , Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {
column
}; try {
cursor = context.getContentResolver()
.query(uri, projection, selection, selectionArgs,null);
if (cursor != null && cursor.moveToFirst()) {
final int column_index = cursor
.getColumnIndexOrThrow(column);
return cursor.getString(column_index);
}
} finally {
if (cursor != null)
cursor.close();
} return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents" .equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents" .equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents" .equals(uri.getAuthority());
}
}详见stackoverflow：http://stackoverflow.com/questions/13209494/how-to-get-the-full-file-path-from-uri
三、裁剪拿到图片的绝对路径，有可能需要对它进行裁剪，这里当然也可以调用系统的裁剪，不过我推荐UCrop，功能好强大，简单的使用方法：
/**
* 启动裁剪
*/public static String startUCrop(Activity activity, String sourceFilePath, int requestCode, float aspectRatioX, float aspectRatioY) {
Uri sourceUri = Uri.fromFile(new File(sourceFilePath));
File outDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
if (!outDir.exists()) {
outDir.mkdirs();
}
File outFile = new File(outDir,
System.currentTimeMillis() + ".jpg");
String cameraScalePath = outFile.getAbsolutePath();
Uri destinationUri = Uri.fromFile(outFile);
UCrop uCrop = UCrop.of(sourceUri, destinationUri);
UCrop.Options options = new UCrop.Options();
options.setAllowedGestures(UCropActivity.SCALE,
UCropActivity.ROTATE, UCropActivity.ALL);
options.setHideBottomControls(true);
options.setFreeStyleCropEnabled(true);
uCrop.withOptions(options);
uCrop.withAspectRatio(aspectRatioX, aspectRatioY);
uCrop.start(activity, requestCode);
return cameraScalePath;
}详见github：https://github.com/Yalantis/uCrop
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