java - 更新 Android ListView 中显示的 Firebase 记录

Question

到目前为止，我已经能够在 Android ListView 中显示节点维护的 Firebase 记录。不过，我希望更新这些记录的一部分。

单击记录时，将出现一个带有微调器 (spinnerProgress) 的 AlertDialog 对话框。通过更改此 spinner 上的选项并单击“确定”“按钮”，ListView 以及 Firebase 数据库将会更新。

* 编辑*

所以，我在这个问题上取得了一些进展。当我单击 buttonUpdateProgress 时，ListView 部分(progress)完美更新。

但是，它同时从 ListView 中删除了我的字符串 title 和 description。有什么想法可以让它只进步改变吗？

下面是我的代码:

listViewIssues.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            Maintenance maintenance = maintenanceList.get(position);

            showProgressDialog(maintenance.getMaintenanceId(), maintenance.getMaintenanceTitle(), maintenance.getMaintenanceDescription(), maintenance.getMaintenanceProperty(), maintenance.getMaintenanceProgress());
        }
    });

--

private void showProgressDialog(final String id, String title, String description, String property, String maintenanceTitle) {

        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);

        LayoutInflater inflater = getLayoutInflater();

        final View dialogView = inflater.inflate(R.layout.archive_maintenance, null);

        dialogBuilder.setView(dialogView);

        final Spinner spinnerProgress = (Spinner) dialogView.findViewById(R.id.spinnerProgress);
        final Button buttonUpdateProgress = (Button) dialogView.findViewById(R.id.buttonUpdateProgress);

        dialogBuilder.setTitle("Maintenance: " + maintenanceTitle);

        final AlertDialog alertDialog = dialogBuilder.create();
        alertDialog.show();

        buttonUpdateProgress.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String title = editTextTitle.getText().toString().trim();
                String desc = editTextDesc.getText().toString().trim();

                String progress = spinnerProgress.getSelectedItem().toString();
                String property = spinnerProperty.getSelectedItem().toString();

                updateProgress(title, desc, id, property, progress);

                alertDialog.dismiss();
            }
        });
    }

--

private boolean updateProgress (String title, String desc, String id, String property, String progress) {

        DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("maintenance").child(id);
        Maintenance maintenance = new Maintenance(id, title, desc, property, progress);

        FirebaseUser user = mAuth.getCurrentUser();
        String uid = user.getUid();

        databaseMaintenance.child(uid).child(id).setValue(maintenance);

        databaseReference.setValue(maintenance);

        Toast.makeText(this, "Maintenance Updated Updated Successfully", Toast.LENGTH_LONG).show();

        return true;

    }

Answer 1

Can you please try replacing this function with your function and try

一些解释:

ref.updateChildren(hashMap); // will let you update the only data you want to change

ref.setValue(model);  // will replace the existing data with the model you provided

替换函数

private boolean updateProgress (String title, String desc, String id, String property, String progress) {
    DatabaseReference databaseReference = FirebaseDatabase.getInstance()
                           .getReference().child("maintenance");
    FirebaseUser user = mAuth.getCurrentUser();
    String uid = user.getUid();

    Map<String, Object> params = new HashMap<>();

    params.put("progress", progress);  // put only params you want to update

    databaseReference.child(uid)
                     .child(id)
                     .updateChildren(params);

    Toast.makeText(this, "Maintenance Updated Updated Successfully", Toast.LENGTH_LONG).show();
    return true;
}

注意:仅放置您想要更新的参数，如下例所示，如果您想更改进度，则代码 fragment 将如下所示，

Map<String, Object> params = new HashMap<>();

params.put("progress", progress); 

ref.updateChildren(params);