MediaStore.MediaColumns.DATA 常量在 API 级别 Q 中已弃用。
应用程序可能没有直接访问此路径的文件系统权限。应用程序不应尝试直接打开此路径,而应使用 ContentResolver#openFileDescriptor(Uri, String) 来获得访问权限。对于面向 Build.VERSION_CODES.Q 或更高版本的应用,此值将始终为 NULL。
最佳答案
这是真的,我们无法获得真正的路径。只是简单的方法用 contentResolver() 打开流并将文件的全部内容复制到新文件中,为了获取文件信息,我们需要调用 getContentResolver().query() 的 query() 方法,然后我们可以获得文件的 DISPLAY_NAME以及更多信息,例如 FILE_SIZE。
对问题投赞成票的人的简单代码示例:
public class MainFragment extends Fragment {
private Button openGallery;
private File selectedFile;
private Context context;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
context = container.getContext();
return inflater.inflate(R.layout.fragment_question, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
openGallery = view.findViewById(R.id.openGallery);
openGallery.setOnClickListener(v->browseFile());
}
private void browseFile() {
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
openFiles();
} else {
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 786);
}
}
private void openFiles() {
deleteFileFromCacheDir();
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
intent.addCategory(Intent.CATEGORY_OPENABLE);
if (intent.resolveActivity(context.getPackageManager()) != null) {
startActivityForResult(intent, 786);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 786 && resultCode == -1 && data != null) {
Uri uri = data.getData();
openStreamAndCopyContent(uri); // Here i am just copy the content of file and paste it into my new file. You can check the type of the file image/video/audio & do it whatever you want
// Now here is your file
if (selectedFile != null && selectedFile.exists()){
// Do it whatever you want Or send it to server
}
}
}
private void openStreamAndCopyContent(Uri uri) {
try {
String fileName = "temp" + System.currentTimeMillis() + "." + MimeTypeMap.getSingleton().getExtensionFromMimeType(context.getContentResolver().getType(uri));
selectedFile = new File(context.getCacheDir().getAbsolutePath() + File.separator + fileName);
InputStream inputStream = context.getContentResolver().openInputStream(uri);
if (inputStream != null) {
Utility.copy(inputStream, selectedFile);
}
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 786) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
openFiles();
} else if (grantResults[0] == PackageManager.PERMISSION_DENIED && getActivity() != null) {
if (!ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE)) {
new AlertDialog.Builder(context).setTitle(R.string.permission_required).setMessage(R.string.permission_message)
.setPositiveButton(R.string.open_settings, (dialog, which) ->
context.startActivity(new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
Uri.parse("package:" + BuildConfig.APPLICATION_ID)))).setNegativeButton(R.string.close, null).show();
}
}
}
}
private void deleteFileFromCacheDir() {
if (selectedFile != null && selectedFile.exists()) {
if (selectedFile.delete()) {
selectedFile = null;
}
}
}
@Override
public void onDestroyView() {
deleteFileFromCacheDir();
super.onDestroyView();
}
}
关于android - 如何从 Android Q 中的 contentResolver.openFileDescriptor(Uri uri, String s) 获取媒体项 real_Path?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55796224/