Android 11 外部存储权限适配指南及方案 - 简书 

//https://www.jianshu.com/p/e94cea26e213<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" /><applicationandroid:requestLegacyExternalStorage="true">if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {// 先判断有没有权限if (Environment.isExternalStorageManager()) {writeFile();} else {Intent intent = new Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION);intent.setData(Uri.parse("package:" + context.getPackageName()));startActivityForResult(intent, REQUEST_CODE);}} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {// 先判断有没有权限if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED &&ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {writeFile();} else {ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CODE);}} else {writeFile();}