使用LibGDX无法读写外部存储器 [英] Cant write nor read to/from external storage with LibGDX
问题描述
我的 create
方法如下:
@Override
public void create () {
batch = new SpriteBatch();
FileHandle file = Gdx.files.external("file.txt");
file.writeString("My god, it's full of stars", false);
}
我还包括:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
我得到的例外是:
02-13 14:45:51.858 12439-12466/com.snowdevs.tweetiebirds E/AndroidRuntime: FATAL EXCEPTION: GLThread 1120
Process: com.snowdevs.tweetiebirds, PID: 12439
com.badlogic.gdx.utils.GdxRuntimeException: Error writing file: file.txt (External)
at com.badlogic.gdx.files.FileHandle.writeString(FileHandle.java:353)
at com.badlogic.gdx.files.FileHandle.writeString(FileHandle.java:339)
at com.snowdevs.tweetiebirds.TweetieBirdsGame.create(TweetieBirdsGame.java:22)
at com.badlogic.gdx.backends.android.AndroidGraphics.onSurfaceChanged(AndroidGraphics.java:254)
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1519)
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1240)
Caused by: com.badlogic.gdx.utils.GdxRuntimeException: Error writing file: file.txt (External)
at com.badlogic.gdx.files.FileHandle.writer(FileHandle.java:330)
at com.badlogic.gdx.files.FileHandle.writeString(FileHandle.java:350)
at com.badlogic.gdx.files.FileHandle.writeString(FileHandle.java:339)
at com.snowdevs.tweetiebirds.TweetieBirdsGame.create(TweetieBirdsGame.java:22)
at com.badlogic.gdx.backends.android.AndroidGraphics.onSurfaceChanged(AndroidGraphics.java:254)
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1519)
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1240)
Caused by: java.io.FileNotFoundException: /storage/emulated/0/file.txt: open failed: EACCES (Permission denied)
at libcore.io.IoBridge.open(IoBridge.java:452)
at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
at com.badlogic.gdx.files.FileHandle.writer(FileHandle.java:322)
at com.badlogic.gdx.files.FileHandle.writeString(FileHandle.java:350)
at com.badlogic.gdx.files.FileHandle.writeString(FileHandle.java:339)
at com.snowdevs.tweetiebirds.TweetieBirdsGame.create(TweetieBirdsGame.java:22)
at com.badlogic.gdx.backends.android.AndroidGraphics.onSurfaceChanged(AndroidGraphics.java:254)
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1519)
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1240)
Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
at libcore.io.IoBridge.open(IoBridge.java:438)
at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
at com.badlogic.gdx.files.FileHandle.writer(FileHandle.java:322)
at com.badlogic.gdx.files.FileHandle.writeString(FileHandle.java:350)
at com.badlogic.gdx.files.FileHandle.writeString(FileHandle.java:339)
at com.snowdevs.tweetiebirds.TweetieBirdsGame.create(TweetieBirdsGame.java:22)
at com.badlogic.gdx.backends.android.AndroidGraphics.onSurfaceChanged(AndroidGraphics.java:254)
at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1519)
at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1240)
我使用带有Android 6棉花糖的Nexus 5进行测试.我经过搜索发现,Android 6使用了 Run Time Permissions ,但是 LibGDX
开发人员说它甚至可以在Android 6上运行.是否有修复程序,无论是否安装了运行时间权限?
I use a Nexus 5 with Android 6 Marshmallow for testing.
I searched and found that Android 6 uses Run Time Permissions, but the LibGDX
developers say that it works even on Android 6. Is there a fix, either with or without Run Time Permissions?
推荐答案
我通过以下方法解决了该问题:检查用户是否已授予外部存储的权限,如果未通过以下方式授予用户请求的权限:
I solved the problem by checking if the user has granted permission of external storage and request permision if not granted by using:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (this.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
this.requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, WRITE_REQUEST_CODE);
}
所有这些都是特定于android的代码,因此位于 AndroidLauncher
类中.
All of this is android-specific code and thus resides in the AndroidLauncher
class.
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