Android 10写入文件到公共DCIM目录，NON DEPRECATED方法

Question

我们有一个Android应用程序，现场工作人员拍摄的照片存储在他们的手机上，并通过web api上传。如果上传失败，他们确实有重试机制，但有时他们需要把照片从手机上拉下来。为了将应用程序升级到Android 10版本而不弃用，我被迫将图像写入应用程序内部目录。问题是，当他们升级应用程序时，他们会从应用程序中丢失照片。(我也复制图像到备份目录，但这看起来有点笨拙)

我想写的图像到:/存储/模拟/0/DCIM GoTrialImages

相反，他们将:/存储/模拟/0/Android/数据/au.come.aceware.ktr.ktr/文件/DCIM/GoTrialImages/photoIntent(其中photoIntent是这个发生在其中的activity)

下面是我从一篇在线文章中复制和调整的代码:

String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String fileName = "JPEG_" + timeStamp + ".jpg";
File mediaStorageDir = new File(getExternalFilesDir(Environment.DIRECTORY_DCIM + File.separator +"GoTrialPhotos"), TAG);
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists() && !mediaStorageDir.mkdirs()){
Log.d(TAG, "failed to create directory");
}
// Return the file target for the photo based on filename
File file = new File(mediaStorageDir.getPath() + File.separator + fileName);
Uri bmpUri = FileProvider.getUriForFile(this, BuildConfig.APPLICATION_ID + ".provider", file);

下面是我在manifest中的文件提供程序条目:

android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths" />
</provider>```
and here is @xml/provider_paths:

```<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="external_files" path="."/>
</paths>```

1) Is it possible to do what I am seeking to do ?
2) How do I do it without using deprecated code
Many thanks in advance
Tony
Following the suggestion to use media store I kept most of the code for creating the app internal file name 
(mainly because I wanted the randomised display name):
private File createImageFileV2() throws IOException
{
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
imageFileNameToUseAtWebServerEnd = strTrial + "_" + timeStamp + "_" + strUserId + ".jpg";
File[] storageDir = getExternalMediaDirs();
File image = File.createTempFile(
imageFileName,  /* prefix */
".jpg",         /* suffix */
storageDir[0]     /* directory */
);
return image;
}
I then passed the file object in to the following code:
public Uri testgetPhotoFileUri2(File f)
{
Uri uri = null;
String strDisplayName = f.getName();
final ContentValues values = new ContentValues();
values.put(MediaStore.MediaColumns.DISPLAY_NAME, strDisplayName);
values.put(MediaStore.MediaColumns.MIME_TYPE, "image/jpeg");
values.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_DCIM );
final ContentResolver resolver = thisContext.getContentResolver();
try
{
final Uri contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
uri = resolver.insert(contentUri, values);
if (uri == null)
throw new IOException("Failed to create new MediaStore record.");
return uri;
}
catch (IOException e)
{
if (uri != null) {
// Don't leave an orphan entry in the MediaStore
resolver.delete(uri, null, null);
}
}
return uri;
}
I then used the resulting uri as my camera uri:
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, cameraUri);
However, when the OnActivityResult calls HandleBigCameraPhoto and attempts to extract the bitmap using the CameraUri:
private void handleBigCameraPhoto() {
Bitmap bitmap = null;
if (cameraUri != null)
{
if (Build.VERSION.SDK_INT >= 29) {
ImageDecoder.Source source = ImageDecoder.createSource(getApplicationContext().getContentResolver(), cameraUri);
try {
bitmap = ImageDecoder.decodeBitmap(source);
} catch (IOException e) {
e.printStackTrace();
}
It error traps to "no such file or directory"
Does this mean that I need to most of my work (image resizing, rotation, etc) using my app private file only and then as a last step insert the bitmap in to media store (and then delete the app private file so the user does not see the file name twice under gallery, recents)?

Answer 1

不能使用已弃用的函数:

File file = new File(getExternalFilesDir(null)
.getParentFile()
.getParentFile()
.getParentFile()
.getParentFile(), "DCIM");

; -)。