Question

我目前有一个Android ListView，用于显示Firebase数据库中的数据。当我点击ListView中的数据记录时，会显示Alert Dialog和存档Button。

我希望将选定的记录转移到我的应用程序中的另一个活动中的另一个ListView，即“已归档”。

我知道这意味着要为我的Firebase数据库创建一个archive节点。

以下是调出Alert Dialog的方法，其中包含Button来执行我的方法archiveMaintenance。然而，我被困在哪里，从哪里开始放入archiveMaintenance。

showProgressDialog

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();
        }
    });

    buttonUpdateArchive.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            archiveMaintenance(id);
        }
    });

}

archivedMaintenance

private void archiveMaintenance(String id) {

        DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
        DatabaseReference recordsRef = rootRef.child("maintenance");
        DatabaseReference recordIdRef = recordsRef.child(id);
        DatabaseReference archivedRecordsRef = rootRef.child("archive");
        ValueEventListener valueEventListener = new ValueEventListener() {

            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                MaintenanceList maintenanceList = dataSnapshot.getValue(MaintenanceList.class); //First step
                archivedRecordsRef.child(id).setValue(maintenanceList); //Second step
                dataSnapshot.getRef().removeValue(); //Third step

            }

            @Override
            public void onCancelled(DatabaseError databaseError) {}
        };

        recordIdRef.addListenerForSingleValueEvent(valueEventListener);
    }

MaintenanceList

public class MaintenanceList extends ArrayAdapter<Maintenance> {

    private Activity context;
    private List<Maintenance> maintenanceList;

    public MaintenanceList(Activity context, List<Maintenance> maintenanceList) {

        super(context, R.layout.maintenance_list_layout, maintenanceList);
        this.context = context;
        this.maintenanceList = maintenanceList;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        LayoutInflater inflater = context.getLayoutInflater();

        View listViewItem = inflater.inflate(R.layout.maintenance_list_layout, null, true);

        TextView textViewTitle = (TextView) listViewItem.findViewById(R.id.textViewTitle);
        TextView textViewDesc = (TextView) listViewItem.findViewById(R.id.textViewDesc);
        TextView textViewProperty = (TextView) listViewItem.findViewById(R.id.textViewProperty);
        TextView textViewProgress = (TextView) listViewItem.findViewById(R.id.textViewProgress);

        Maintenance maintenance = maintenanceList.get(position);

        textViewTitle.setText(maintenance.getMaintenanceTitle());
        textViewDesc.setText(maintenance.getMaintenanceDescription());
        textViewProperty.setText(maintenance.getMaintenanceProperty());
        textViewProgress.setText(maintenance.getMaintenanceProgress());

        return listViewItem;
    }
}

我已经创建了ListView并准备好接收数据的活动 - ArchiveList。

对此的任何想法/指示都将非常感激。

Answer 1

在archiveMaintenance(id)方法中，您需要添加可帮助您将记录从某个位置移动到另一个位置的代码。假设您有一个records节点，其中存在所有记录，archivedRecords节点存在所有存档记录。假设您有一个名为RecordModel的帮助程序类，要将记录从一个位置移动到另一个位置，您需要按照以下步骤操作：

获取记录
将记录添加到新位置
从旧位置删除记录

您的方法应如下所示：

private void archiveMaintenance(String recordId) {
    DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
    DatabaseReference recordsRef = rootRef.child("records");
    DatabaseReference recordIdRef = recordsRef.child(recordId);
    DatabaseReference archivedRecordsRef = rootRef.child("archivedRecords");
    ValueEventListener valueEventListener = new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            RecordModel recordModel = dataSnapshot.getValue(RecordModel.class); //First step
            archivedRecordsRef.child(recordId).setValue(recordModel); //Second step
            dataSnapshot.getRef().removeValue(); //Third step
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {}
    };
    recordIdRef.addListenerForSingleValueEvent(valueEventListener);
}

是否可以“存档”Firebase记录

1 个答案: