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android - 在 recyclerview Android 中从 Spinner 获取所有选定的项目

问题描述

我在Recyclerview中使用了Spinner。我在 Mainactivity 中有一个按钮。当我单击该按钮时，我需要从 recyclerview 的每一行中获取所有选定的项目。getSelectedItem()方法将从微调器返回所选项目，但我认为它仅适用于单个项目。我认为不需要使用setOnItemSelectedListener。

我的代码是：

public class MainActivity extends AppCompatActivity {


RecyclerView recycler_view;
Button button;

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

    recycler_view=findViewById(R.id.recycler_view);
    button = findViewById(R.id.button);

    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);
    recycler_view.setLayoutManager(mLayoutManager);
    setAdapter();
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

        }
    });
}





private void setAdapter( ) {

        recycler_view.setVisibility(View.VISIBLE);
        StudentsListAdapter studentsListAdapter = new StudentsListAdapter(this);
        recycler_view.setAdapter(studentsListAdapter);
        // runLayoutAnimation(recycler_view, mSelectedItem);


}
}

适配器：

public class StudentsListAdapter extends RecyclerView.Adapter<StudentsListAdapter.MyViewHolder> {


String[] list={"Microbiology","Pharmacology","Microbiology","Forensic Medicine"};

String[] studentsName={"Student1","Student2","Studen3","Student4"};

Context ctx;

private ArrayAdapter<String> dataAdapter;

    public class MyViewHolder extends RecyclerView.ViewHolder {



    @BindView(R.id.text_name)
    TextView text_name;


    @BindView(R.id.spinner1)
    Spinner spinner1;

    MyViewHolder(View view) {
        super(view);
        ButterKnife.bind(this, view);
    }
}

public StudentsListAdapter(Context ctx ) {
    this.ctx = ctx;

}

@NonNull
@Override
     public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.student_list_item, parent, false);

    return new MyViewHolder(itemView);
}

@SuppressLint("SetTextI18n")
@Override
public void onBindViewHolder(@NonNull final MyViewHolder holder, @SuppressLint("RecyclerView") final int position) {

    holder.text_name.setText(studentsName[position]);


    dataAdapter = new ArrayAdapter<String>(ctx, R.layout.spinner_item, list);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    holder.spinner1.setAdapter(dataAdapter);
    Log.d("Holder ",""+ holder.spinner1.getSelectedItem());
}

@Override
public int getItemCount() {
    return studentsName.length;
}

 }

标签： androidandroid-recyclerviewandroid-spinner

解决方案

我想您需要添加一个复选框才能知道选择了哪些项目。

Arraylist selectedStudent = new Arraylist();

    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder holder, @SuppressLint("RecyclerView") final int position) {

        holder.text_name.setText(studentsName[position]);


        dataAdapter = new ArrayAdapter<String>(ctx, R.layout.spinner_item, list);
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        holder.spinner1.setAdapter(dataAdapter);
            Log.d("Holder ",""+ holder.spinner1.getSelectedItem());

        //checkbox listener
        holder.checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        if (isChecked){
            selectedStudent.add(studentsName[position]);
        }
    }

});
        }

在您的活动中，您可以访问您的变量 selectedStudent

 StudentsListAdapter studentListAdapter;

    button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
              for (int i = 0; i < studentListAdapter.selectedStudent.size()-1 ; i++) {
              Log.d("studentSelected".""+studentListAdapter.selectedStudent.get(i));
        }
            }
        });

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