无法使用 LibGDX 向外部存储写入或读取

Question

我的create方法如下所示：

@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"/>

我得到的例外是这样的：

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。我搜索并发现Android 6使用运行时权限，但LibGDX开发人员表示它甚至可以在Android 6上运行。是否有修复程序，无论是否具有运行时权限？

Answer 1

我通过检查用户是否已授予外部存储的权限来解决问题，如果未授予，则使用以下方法请求权限：

            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，因此驻留在 AndroidLauncher 类中。

Answer 2

我不相信Nexus 5有外部存储(SD卡(。

用这个来测试找出 -

boolean isExtAvailable = Gdx.files.isExternalStorageAvailable();

您可以在此处找到更多信息。

Answer 3

我遇到了同样的情况(Android 6，Nexus 4 No SD Card，libGDX 1.9.3(：
我检查了外部存储

Gdx.files.isExternalStorageAvailable() // returns true

然后获取文件句柄

FileHandle file = Gdx.files.external("file.txt"); // no exception

然后打电话

file.writeString("text",false); // throws GdxRuntimeException

所以我在安卓端检查了外部存储是否真的可以使用此代码：

Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()); // returns true

这也返回了 true。所以这不是libGDX的问题，而是Android的问题。

然后我通过捕获异常并在这种情况下将文件写入本地存储来解决它。