Question

我正在创建一个应用，要求安装后直接启动时从设备存储中读取xml文件。我遇到一个问题，在运行时询问“ Manifest.permission.READ_EXTERNAL_STORAGE”权限（并授予它）后，“ new File（Environment.getExternalStorageDirectory（））。canRead（）”在我重新启动应用程序之前始终返回false。重新启动后，一切正常，但这不是我需要的。奇怪的是，在收到授予的权限后，如果我检查应用程序是否已设置权限，一切都会很好

ContextCompat.checkSelfPermission(getContext(), Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;  -> always returns true after granting the permission

这是我的代码：

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                       @NonNull int[] grantResults) {
    if (requestCode == AddServerFragment.EXTERNAL_STORAGE_READ_PREMISSION) {
        if (permissions.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            Logger.log(LOG_TAG, android.Manifest.permission.READ_EXTERNAL_STORAGE + " has been granted", Log.VERBOSE);
            ((AddServerFragment) getSupportFragmentManager().findFragmentByTag(getAttachedFragmentTag())).parseServerConfigFile();
        } else {
            Logger.log(LOG_TAG, android.Manifest.permission.READ_EXTERNAL_STORAGE + " has been denied", Log.INFO);
        }
        return;
    }
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}

ParseServerConfigFile（）

void parseServerConfigFile() {
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) ||
            Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED_READ_ONLY)) {
        File serverSetupFile = new File(Environment.getExternalStorageDirectory(), getString(R.string.server_ini_file_name));
        ConfigureServerAsyncTask configureServerAsyncTask = new ConfigureServerAsyncTask(this);
        configureServerAsyncTask.execute(serverSetupFile);
    } else {
        Logger.log(LOG_TAG, "Storage not available at the moment", Log.INFO);
        Toast.makeText(getContext(), "Storage not available", Toast.LENGTH_SHORT).show();
    }
}

Logcat： 07-21 10：34：55.320 25272-25272 / com.mdmobile.cyclops V / LoginActivity：android.permission.READ_EXTERNAL_STORAGE已被授予 07-21 10：36：01.277 25272-25335 / com.mdmobile.cyclops V / FA：使用测量服务连接到远程服务 07-21 10：36：01.290 25272-25335 / com.mdmobile.cyclops V / FA：活动已恢复，时间：22213849 07-21 10：36：01.291 25272-25272 / com.mdmobile.cyclops I / ConfigureServerAsyncTask：找不到ServerSetup.xml文件

有人见过吗？

Answer 1

就像大卫·迈克尔（David Michael）指出的那样可能的解决方案虽然很难看（看起来像个错误），但一旦接受许可，就可以看到应用程序重新加载：

@Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        if (requestCode == AddServerFragment.EXTERNAL_STORAGE_READ_PREMISSION) {
            if (permissions.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Logger.log(LOG_TAG, android.Manifest.permission.READ_EXTERNAL_STORAGE + " has been granted \n app restart required",
                        Log.INFO);
                //READ STORAGE PERMISSION requires application restart as it is a linux permission
                Intent i = getBaseContext().getPackageManager()
                        .getLaunchIntentForPackage(getBaseContext().getPackageName());
                if (i != null) {
                    i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(i);
                    System.exit(0);
                }
            } else {
                Logger.log(LOG_TAG, android.Manifest.permission.READ_EXTERNAL_STORAGE + " has been denied", Log.INFO);
            }
            return;
        }

重新启动应用程序之前未分配READ_EXTERNAL_STORAGE

1 个答案: