我想使用文件选择器意图选择CSV文件，并使用CSV阅读器读取它，并将数据存储在Firebase数据库中。我该怎么做？

Question

我试图将数据存储在firebase数据库中，而我必须从csv文件中获取数据。我正在使用文件选择器意图选择csv文件。我正在使用CSVReader从csv文件读取数据。

public class CSV_UploadActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btnUpload;

    public static final int PICKFILE_RESULT_CODE = 1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_csv__upload);

        btnUpload = (Button) findViewById(R.id.btnUpload);

        btnUpload.setOnClickListener(this);

    }

    @Override
    public void onClick(View view) {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType("text/csv");
        startActivityForResult(Intent.createChooser(intent, "Open CSV"), 1);
    }


    @Override
    protected void onActivityResult ( int requestCode, int resultCode, Intent data){
        if(resultCode == RESULT_OK) {
            onImport(new File(data.getData().getPath()));
        }
    }


    public void onImport(File files) {
        try {
            CSVReader dataRead = new CSVReader(new FileReader(files));
            String[] nextLine;
            try {
                while ((nextLine = dataRead.readNext()) != null) {

                    // nextLine[] is an array of values from the line
                    String AEMAIL = nextLine[0];
                    String BRANCH = nextLine[1];
                    String DOB = nextLine[2];
                    String GENDER = nextLine[3];
                    String MOBILE_NO = nextLine[4];
                    String NAME = nextLine[5];
                    RegStudInfo StudInfo = new RegStudInfo(AEMAIL,BRANCH,DOB,GENDER,MOBILE_NO,NAME);
                    System.out.println(StudInfo.getBRANCH());
                    try {
                        DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference("users/CE");
                        String KeyValue = mDatabase.push().getKey();
                        mDatabase.child(KeyValue).setValue(StudInfo);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    Toast.makeText(getApplicationContext(), "Data inserted into table...", Toast.LENGTH_SHORT).show();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }catch (IOException e) {
            e.printStackTrace();
        }
    }
}