How can I let users access the internal storage directory of my app?

Question

My app stores files in its internal storage directory (/Android/data/com.mycompany.myapp/files, as returned by getFilesDir()), and I would like to allow users to access thos

Answer 1

add this to manifest

then add this in your activity:

private static final String RequieredPermission = Manifest.permission.READ_EXTERNAL_STORAGE;

then call HandlePermission() where your require to check for permission, usually in Oncreate method of an activity. These functions are then required:

@Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        Log.d("amir", "onRequestPermissionsResult: called");
        switch (requestCode) {
            case REQUEST_PERMISSION_READING_STATE:
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Toast.makeText(MainActivity.this, "Permission Granted!", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(MainActivity.this, "Permission Denied!", Toast.LENGTH_SHORT).show();
                }
        }

    }

    private void HandlePermission() {
        int permissionCheck = ContextCompat.checkSelfPermission(
                this, RequieredPermission);
        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    RequieredPermission)) {
                showExplanationaboutPermission("Permission Needed", "Rationale", RequieredPermission, REQUEST_PERMISSION_READING_STATE);
            } else {
                requestPermission(RequieredPermission, REQUEST_PERMISSION_READING_STATE);
            }
        } else {
            Toast.makeText(MainActivity.this, "Permission (already) Granted!", Toast.LENGTH_SHORT).show();
        }
    }

    private void showExplanationaboutPermission(String title,
                                                String message,
                                                final String permission,
                                                final int permissionRequestCode) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(title)
                .setMessage(message)
                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        requestPermission(permission, permissionRequestCode);
                    }
                });
        builder.create().show();
    }

    private void requestPermission(String permissionName, int permissionRequestCode) {
        ActivityCompat.requestPermissions(this,
                new String[]{permissionName}, permissionRequestCode);
    }