java.io.FileNotFoundException打开失败:EEXIST(文件存在)Android 11

Question

我试图从服务器下载一个图像并将其保存在外部内存中，但在Android 11中，当我试图创建文件时，它会给我一个错误。我已授予访问外部存储器的权限。

我在网上搜索了一下，他们建议我把这个代码放在清单中，但它不适用于android 11

android:requestLegacyExternalStorage="true"

清单

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:requestLegacyExternalStorage="true"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.TestDwonloadImgApp"
android:usesCleartextTraffic="true">
<activity android:name=".MainActivity2">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity">
</activity>
</application>

主要活动

public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView img = findViewById(R.id.img);
ImmagineInterface ii = RetrofitManager.retrofit.create(ImmagineInterface.class);
Call<ResponseBody> call = ii.downloadFile("/immaginimusei/arte-scienza.jpg");
call.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
if (response.code() == 200) {
boolean result = writeResponseBody(response.body(), "/immaginimusei/arte-scienza.jpg");
if(result) {
Bitmap bitmap = BitmapFactory.decodeFile(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString() + "/ArtHunter/immaginimusei/arte-scienza.jpg");
img.setImageBitmap(bitmap);
}
}
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
Bitmap bitmap = BitmapFactory.decodeFile(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString() + "/ArtHunter/immaginimusei/arte-scienza.jpg");
img.setImageBitmap(bitmap);
}
});
}
}

writeResponseBody

public static boolean writeResponseBody(ResponseBody body, String dir1) {
try {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// todo change the file location/name according to your needs
String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString() + "/ArtHunter";
String path1 = path + dir1;
File f = new File(path1);
String path2 = f.getPath();
String nome = f.getName();
path2 = path2.replaceAll("/" + nome, "");
File directory = new File(path2);
if (!directory.exists())
directory.mkdirs();
File img = new File(path2, nome);
if (img.exists())
return true;
img.createNewFile();
InputStream inputStream = null;
FileOutputStream outputStream = null;
try {
byte[] fileReader = new byte[4096];
inputStream = body.byteStream();
outputStream = new FileOutputStream(img); //error here!
while (true) {
int read = inputStream.read(fileReader);
if (read == -1) {
break;
}
outputStream.write(fileReader, 0, read);
}
outputStream.flush();
return true;
} catch (IOException e) {
e.printStackTrace();
return false;
} finally {
if (inputStream != null) {
inputStream.close();
}
if (outputStream != null) {
outputStream.close();
}
}
}
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}

错误

/System.err: java.io.FileNotFoundException: /storage/emulated/0/Download/ArtHunter/immaginimusei/arte-scienza.jpg: open failed: EEXIST (File exists)
W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:492)
at java.io.FileOutputStream.<init>(FileOutputStream.java:236)
at java.io.FileOutputStream.<init>(FileOutputStream.java:186)
at com.theapplegeek.testdwonloadimgapp.MainActivity.writeResponseBody(MainActivity.java:93)
at com.theapplegeek.testdwonloadimgapp.MainActivity$1.onResponse(MainActivity.java:47)
at retrofit2.DefaultCallAdapterFactory$ExecutorCallbackCall$1.lambda$onResponse$0$DefaultCallAdapterFactory$ExecutorCallbackCall$1(DefaultCallAdapterFactory.java:89)
at retrofit2.-$$Lambda$DefaultCallAdapterFactory$ExecutorCallbackCall$1$hVGjmafRi6VitDIrPNdoFizVAdk.run(Unknown Source:6)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:245)
at android.app.ActivityThread.main(ActivityThread.java:8004)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:631)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:978)
Caused by: android.system.ErrnoException: open failed: EEXIST (File exists)
at libcore.io.Linux.open(Native Method)
at libcore.io.ForwardingOs.open(ForwardingOs.java:166)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:254)
W/System.err:     at libcore.io.ForwardingOs.open(ForwardingOs.java:166)
at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:7865)
at libcore.io.IoBridge.open(IoBridge.java:478)
... 13 more

Answer 1

在Android 11中，android:requestLegacyExternalStorage="true"将被简单地忽略，因为它是Android的特别解决方案<11不要破坏旧的应用程序。现在，你必须使用

<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>

此外，您可以使用SAF来避免所有这些"权限"的麻烦。这是谷歌为那些不需要管理大多数内部存储数据的应用程序推荐的。请参阅：https://developer.android.com/guide/topics/providers/document-provider

然而，如果你不想破坏你的应用程序并失去所有的努力，可以考虑

if(Environment.isExternalStorageManager())
{
internal = new File("/sdcard");
internalContents = internal.listFiles();
}
else
{
Intent permissionIntent = new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
startActivity(permissionIntent);
}

这将打开一个设置页面，您可以在其中授予应用程序的存储访问权限。如果该应用程序已经具有权限，那么您将能够访问该目录。在设置布局资源之后，将其放在onCreate()方法的最开始。

对于您将来构建的任何应用程序，最好不要这样做。

Answer 2

转到您的移动设置->应用程序->选择您的应用程序->权限->存储->选择"允许管理所有文件">

它对我有用。

Answer 3

Android在创建文件夹时变得过于复杂。

如果你想避免这么多问题，不使用android:requestLegacyExternalStorage="true"之类的东西，也不添加MANAGE_EXTERNAL_STORAGE、READ_EXTERNAL_STORAGE、WRITE_EXTERNAL_STORAGE之类的权限，这可能是一场噩梦，即使是在向市场发布应用程序时也是如此。

除此之外，从Android版本30起，您可以NOT扩展android:requestLegacyExternalStorage="true"。所以你会再次遇到问题。

建议您开始将录音保存在应用程序专用文件夹中，因为在未来的Android将不再允许您创建文件夹，即使使用传统方法也是如此。您可以使用标准目录来放置任何文件，如DIRECTORY_MUSIC、DIRECT Y_PICTURES等。

例如，我在Android33中创建了自己的保存录音的方法，效果非常好。我不需要向我的Manifest添加任何内容。

override fun startRecording(): Boolean {
try {
val recordingStoragePath = "${app.getExternalFilesDir(Environment.DIRECTORY_MUSIC)}"
recordingFilePath = "$recordingStoragePath/${fileRecordingUtils.generateFileName()}"
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC)
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)
// Audio Quality Normal
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB)
mediaRecorder.setAudioSamplingRate(8000)
// Set path
mediaRecorder.setOutputFile(recordingFilePath)
mediaRecorder.prepare()
mediaRecorder.start()
Toast.makeText(app, "Recording Started", Toast.LENGTH_SHORT).show()
} catch (e: IOException) {
Toast.makeText(app, "Recording Failed. Problem accessing storage.", Toast.LENGTH_SHORT).show()
mediaRecorder.reset()
return false
} catch (e: Exception) {
mediaRecorder.reset()
return false
}
return true
}