在Android 10及以上的版本中,应用程序需要明确请求授予存储权限才能访问外部存储设备。这可能导致应用程序在运行时遇到存储权限问题,如在设备上读取或写入文件。以下是一些代码示例,可帮助您解决此问题:
if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { // Request the permission ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_STORAGE); } else { // Permission has already been granted // Do storage-related work }
@Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { switch (requestCode) { case PERMISSION_REQUEST_STORAGE: { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { // Permission was granted // Do storage-related work } else { // Permission denied } return; } } }
Android 10及更高版本引入了沙盒存储,这是一种更安全的文件存储方式,不需要请求存储权限即可访问。以下是一个示例:
// Get the directory for the app-specific files File directory = getContext().getFilesDir();
// Get the file path relative to the app-specific directory String filePath = "myFile.txt";
// Create a file object File file = new File(directory, filePath);
// Write data to the file try (FileOutputStream outputStream = new FileOutputStream(file)) { String data = "Hello, world!"; outputStream.write(data.getBytes()); } catch (IOException e) { e.printStackTrace(); }
这些示例可帮助您解决在Android 10及更高版本上的存