从Uri类型android创建文件
我正在尝试从库中选择图像然后将此图像转换为文件并通过HttpPost发送它，但我总是得到FileNotFoundException 。 我的代码：
选择照片
public void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == Activity.RESULT_OK) { if (requestCode == 1) { // currImageURI is the global variable I'm using to hold the content: currImageURI = data.getData(); //Save the currImageUri (URI type) to global variable. photosHolder.getInstance().setOneIm(currImageURI); } } }
转换照片
// First Try File myFile = new File((photosHolder.getInstance().getOneIm()).toString()); params.put("visit_report[photos_attributes][0][file]",myFile); **The exception Raised here // second try File myFile2 = new File((photosHolder.getInstance().getOneIm()).getPath()); params.put("visit_report[photos_attributes][1][file]",myFile2); ** Also here
在调试时，这些是myFiles Value：
mFile : content:/com.android.providers.media.documents/document/image%3A19143 myFile2 : /document/image:19143
那有什么帮助吗？
更新我也试过这个解决方案：
//get The real path from uri then save it (and then use it to create the file) photosHolder.getInstance().setUriString(getRealPathFromURI(currImageURI)); //Convert the image URI to the direct file system path of the image file private String getRealPathFromURI(Uri contentURI) { String result = ""; try { Cursor cursor = getActivity().getContentResolver().query(contentURI, null, null, null, null); if (cursor == null) { // Source is Dropbox or other similar local file path result = contentURI.getPath(); } else { cursor.moveToFirst(); int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); result = cursor.getString(idx); // Exception raised HERE cursor.close(); } } catch (Exception e) { e.printStackTrace(); } return result; }
但是我得到了java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it并将idx var ==设置为-1 java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it
我也试过@Praneeth Kalluri解决方案，但结果总是返回null。
Uri currImageURI = data.getData();
打印currImageURI会给你一些这样的事情：
content://media/external/images/media/47
但我们需要的是特定图像的绝对路径。 所以我们需要从uri获得真正的路径
public String getRealPathFromURI(Context context, Uri contentUri) { Cursor cursor = null; try { String[] proj = { MediaStore.Images.Media.DATA }; cursor = context.getContentResolver().query(contentUri, proj, null, null, null); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(column_index); } finally { if (cursor != null) { cursor.close(); } } }
现在修改你的代码就像
public void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == Activity.RESULT_OK) { if (requestCode == 1) { // currImageURI is the global variable I'm using to hold the content: currImageURI = data.getData(); //Save the currImageUri (URI type) to global variable. photosHolder.getInstance().setOneIm(getRealPathFromURI(getActivity(),currImageURI)); } } } public String getRealPathFromURI(Context context, Uri contentUri) { Cursor cursor = null; try { String[] proj = { MediaStore.Images.Media.DATA }; cursor = context.getContentResolver().query(contentUri, proj, null, null, null); int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); cursor.moveToFirst(); return cursor.getString(column_index); } finally { if (cursor != null) { cursor.close(); } } }