英文:
Android with LibGDX get access to a file
问题
我在使用libGDX时遇到了读取Android文件的问题。
我使用的工具如下：
- Lib GDX 1.9.11
- Android Studio 4.2
- Java 1.8.0_261
- Android Gradle 4.0.1
- Gradle 6.6
- Android SDK 30-3
- Android 8.1 x86_64
首先，在XML文件中实现了权限：
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
其次，我请求用户允许访问存储：
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
while (this.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)
this.requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, WRITE_REQUEST_CODE);
while (this.checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)
this.requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, READ_REQUEST_CODE);
}
（一开始我使用了 while 循环来重新询问用户，如果他选择了拒绝，但这并没有起作用，我没有勾选“不再询问”，但对话框没有再次弹出）
它可以正常工作：https://i.stack.imgur.com/v57uG.png
为了创建文件夹和读/写文件，我使用了FileHandle：
public static boolean createFolder(String path) {
final FileHandle file = Gdx.files.local(path);
if (!file.exists()) {
file.mkdirs();
return true;
}
return false;
}
...
final FileHandle playerFile = Gdx.files.local("data/" + fileName + ".dat");
playerFile.writeString(content, false);
...
...
final FileHandle playerFile = Gdx.files.local("data/" + fileName + ".dat");
if (!playerFile.exists())
return null;
final Scanner reader = new Scanner(playerFile.file());
...
问题是读取/写入的访问被拒绝：
type=1400 audit(0.0:11): avc: denied { write } for comm=656374696F6E207072696D6172795D name="perfd" dev="dm-0" ino=7181 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:shell_data_file:s0 tclass=dir permissive=0
type=1400 audit(0.0:10): avc: denied { read } for name="u:object_r:serialno_prop:s0" dev="tmpfs" ino=4438 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:serialno_prop:s0 tclass=file permissive=0
我阅读了这个主题：https://stackoverflow.com/questions/35380746/cant-write-nor-read-to-from-external-storage-with-libgdx/44028465#44028465
但是我使用的是 local 文件，所以我不知道为什么会出现这个问题...
提前谢谢！
英文:
i have an issue to read android files with libGDX
I'm using :
- Lib GDX 1.9.11
- Android Studio 4.2
- Java 1.8.0_261
- Andoid Gradle 4.0.1
- Gradle 6.6
- Android SDK 30-3
- Android 8.1 x86_64
First, i've implemented permissions in the XML file :
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Second, i ask user to allow access to the storage :
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
while (this.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)
this.requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, WRITE_REQUEST_CODE);
while (this.checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)
this.requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, READ_REQUEST_CODE);
}
(At the beginning i've used while to re-ask user if he picked deny, but it doesn't work, i didn't check don't ask again but dialog box doesn't pop again)
It works correctly : https://i.stack.imgur.com/v57uG.png
To create folders and read/write files i'm using FileHandle :
public static boolean createFolder(String path) {
final FileHandle file = Gdx.files.local(path);
if (!file.exists()) {
file.mkdirs();
return true;
}
return false;
}
...
final FileHandle playerFile = Gdx.files.local("data/" + fileName + ".dat");
playerFile.writeString(content, false);
...
...
final FileHandle playerFile = Gdx.files.local("data/" + fileName + ".dat");
if (!playerFile.exists())
return null;
final Scanner reader = new Scanner(playerFile.file());
...
Problem is access to read / write is denied :
type=1400 audit(0.0:11): avc: denied { write } for comm=656374696F6E207072696D6172795D name="perfd" dev="dm-0" ino=7181 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:shell_data_file:s0 tclass=dir permissive=0
type=1400 audit(0.0:10): avc: denied { read } for name="u:object_r:serialno_prop:s0" dev="tmpfs" ino=4438 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:serialno_prop:s0 tclass=file permissive=0
I've read this topic : https://stackoverflow.com/questions/35380746/cant-write-nor-read-to-from-external-storage-with-libgdx/44028465#44028465
But i'm using local files so i don't know where it comes...
Thank you in advance 
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