通过单击Firebase数据库中的按钮来过滤ListView

时间:2019-02-25 15:37:23

标签: java android firebase firebase-realtime-database

我正在尝试从Firebase上获取数据(任务),当单击按钮时会遇到查询。我可以获取所有数据(任务),但是当我单击按钮以获取过滤的数据时,我没有收到预期的结果。

我已将非过滤适配器设置为当我单击按钮时将其清除,并且将filteredAdapter设置为无结果。

我接近正确了吗?

数据库结构

enter image description here

我的Firebase查询

final Query statusQuery = FirebaseDatabase.getInstance().getReference().child("Store 01").child("Task List")
            .orderByChild("Status")
            .equalTo("Complete");

用于获取过滤数据的代码

final ArrayAdapter<String> filterAdapter = new ArrayAdapter<String>(this, R.layout.tasks_layout, R.id.textTask, listTask);
    this.dbTasks.setAdapter(filterAdapter);

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

           statusQuery.addValueEventListener(new ValueEventListener() {
               @Override
               public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                   for (DataSnapshot ds : dataSnapshot.getChildren()) {
                       //adding the key to an Arraylist to be referenced when deleting records
                       filteredTasks.add(ds.getKey());
                       String name = ds.child("Name").getValue(String.class);
                       String date = ds.child("Date").getValue(String.class);
                       String assigned = ds.child("Assigned to").getValue(String.class);
                       String type = ds.child("Type").getValue(String.class);

                       queryTask.add(name  + "\n" + date + "\n" + assigned + "\n" + type);
                Log.d("TAG", name);
                   }//for
                   task_list.this.dbTasks.setAdapter(filterAdapter);
                   arrayAdapter.clear();
                   arrayAdapter.notifyDataSetChanged();
               }//onDataChange

               @Override
               public void onCancelled(@NonNull DatabaseError databaseError) {

               }//OnCancelled
           });
        }//OnClick
    });

用于提取未过滤数据的代码

ValueEventListener eventListener = new ValueEventListener() {
        //Searching the database and adding each task to list
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            for (DataSnapshot ds : dataSnapshot.getChildren()) {
                //adding the key to an Arraylist to be referenced when deleting records
                tasks.add(ds.getKey());
                String name = ds.child("Name").getValue(String.class);
                String date = ds.child("Date").getValue(String.class);
                String assigned = ds.child("Assigned to").getValue(String.class);
                String type = ds.child("Type").getValue(String.class);

                listTask.add(name  + "\n" + date + "\n" + assigned + "\n" + type);
                Log.d("TAG", name);
            }//for
            task_list.this.dbTasks.setAdapter(arrayAdapter);
        }//onDataChange

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }//OnCancelled
    };
    database.addListenerForSingleValueEvent(eventListener);

1 个答案:

答案 0 :(得分:0)

final ArrayAdapter<String> filterAdapter = new ArrayAdapter<String>(this, R.layout.tasks_layout, R.id.textTask, listTask);
this.dbTasks.setAdapter(filterAdapter);

新的阵列适配器指向错误的arrayList“ listTask”,我将其指向“ queryTask”,这解决了该问题。

filterAdapter = new ArrayAdapter<String>(this, R.layout.tasks_layout, R.id.textTask, queryTask);