java - Android EACCES(权限被拒绝)仅在某些设备上

Question

这个问题已经有答案了:

FileNotFoundException: /storage/emulated/0/Android (2 个回答)

java.io.FileNotFoundException: /storage/emulated/0/New file.txt: open failed: EACCES (Permission denied) (5 个回答)

已关闭 3 年前。

我需要在外部存储中创建一个文件夹并解压缩一个文档。在某些设备上，如荣耀 10、三星 J7 和小米 A2，它可以完美运行，但在其他设备上，如华为 Mate 20 和三星 S8，既不能创建文件夹，也不能解压缩。

这些是 AndroidManifest.xml 中请求的权限

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

他们在<application>之外标签

在 MainActivity 中我请求权限

private boolean checkPermissions() {
        if (ActivityCompat.checkSelfPermission(ActivityCompat.checkSelfPermission(this,
            Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == 
            PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        requestPermissions();
        return false;
}

private void requestPermissions() {
        ActivityCompat.requestPermissions(
                this,
                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, 
                             Manifest.permission.WRITE_EXTERNAL_STORAGE},
                             PERMISSION_ID
        );
}

@Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == LOCATION_PERMISSION_ID) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                setFiles();
            }
        }
    }

获得权限后，我执行 setFiles();这将创建文件夹、.nomedia 文件并将videos.zip 解压到创建的文件夹中

public void setFiles(){
        createFolder();
        unzip();
    }

    private void createFolder() {
        //Create Folder
        File folder = new File(Environment.getExternalStorageDirectory().toString()+"/.videoFiles");
        folder.mkdirs();

        //Save the path as a string value
        extStorageDirectory = folder.toString();

        createNomedia();
    }

    private void createNomedia() {
        String filepath = extStorageDirectory;

        File file = new File(filepath+ "/.nomedia");
        try {
            file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private boolean unzip() {
        String zipFile = Environment.getExternalStorageDirectory().toString() + "/videos.zip";
        try{
            FileUnzipper.unzip(zipFile, extStorageDirectory);
            unzipComplete = true;
        } catch (IOException ex){
            Log.e("unzipping", "unzip Exception" + ex);
            unzipComplete = false;

        }
    }

这是 FileUnzipper 类:

import android.util.Log;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import static android.content.ContentValues.TAG;

public class FileUnzipper{

    final static int BUFFER_SIZE = 2048;

    public static void unzip(String zipFile, String location) throws IOException {
        int size;
        byte[] buffer = new byte[BUFFER_SIZE];

        try {
            if ( !location.endsWith(File.separator) ) {
                location += File.separator;
            }
            File f = new File(location);
            if(!f.isDirectory()) {
                f.mkdirs();
            }
            ZipInputStream zin = new ZipInputStream(new BufferedInputStream(new FileInputStream(zipFile), BUFFER_SIZE));
            try {
                ZipEntry ze = null;
                while ((ze = zin.getNextEntry()) != null) {
                    String path = location + ze.getName();
                    File unzipFile = new File(path);

                    if (ze.isDirectory()) {
                        if(!unzipFile.isDirectory()) {
                            unzipFile.mkdirs();
                        }
                    } else {
                        // check for and create parent directories if they don't exist
                        File parentDir = unzipFile.getParentFile();
                        if ( null != parentDir ) {
                            if ( !parentDir.isDirectory() ) {
                                parentDir.mkdirs();
                            }
                        }

                        // unzip the file
                        FileOutputStream out = new FileOutputStream(unzipFile, false);
                        BufferedOutputStream fout = new BufferedOutputStream(out, BUFFER_SIZE);
                        try {
                            while ( (size = zin.read(buffer, 0, BUFFER_SIZE)) != -1 ) {
                                fout.write(buffer, 0, size);
                            }

                            zin.closeEntry();
                        }
                        finally {
                            fout.flush();
                            fout.close();
                        }
                    }
                }
            }
            finally {
                zin.close();
            }
        }
        catch (Exception e) {
            Log.e(TAG, "Unzip exception", e);
        }
    }
}

现在在某些设备上这一切都有效，文件夹和 .nomedia 文件已创建，videos.zip 已解压缩，在其他设备上我得到:

E/ContentValues: Unzip exception
      java.io.FileNotFoundException: /storage/emulated/0/videos.zip: open failed: EACCESS (Permission denied)
           at libcore.io.IOBridge.open(IoBridge.java:496)
           at java.io.FileInputStream.<init>(FileInputStream.java:159)
           at java.io.FileInputStream.<init>(FileInputStream.java:115)
           at com.example.test.FileUnzipper.unzip(FileUnzipper.java:32)

FileUnzipper.java:32 是 ZipInputStream zin = new ZipInputStream(new BufferedInputStream(new FileInputStream(zipFile), BUFFER_SIZE));

我不明白为什么它在某些设备上不起作用，而且我也不知道如何修复它......

Answer 1

尝试使用 requestLegacyExternalStorage 选择退出范围存储:

<manifest ... >
  <application android:requestLegacyExternalStorage="true" ... >
    ...
  </application>
</manifest>

并参见 data and file storage overview .