android - 复制微调器的问题 - Android Studio

Question

我在尝试复制微调器时遇到问题(按下按钮时)。以下是我的 create.java 代码和我的 MyListAdapter.java 代码。我的代码中是否遗漏了一些明显的东西？我一直在尝试追踪穆罕默德的所作所为 here .感谢您的帮助。

创建.java

public class create extends AppCompatActivity {


    Button buttontest;
    private LinearLayout mLinearLayout;

    private ArrayList<Spinner> mSpinners;





    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_create);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);




        mSpinners = new ArrayList<>();

        mLinearLayout = findViewById(R.id.my_linearLayout);

        mLinearLayout.addView(makeSpinner());    // First spinner

        Button duplicateSpinner = findViewById(R.id.bt_duplicate);
        duplicateSpinner.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Spinner spinner = makeSpinner();
                mLinearLayout.addView(spinner);      // Add another spinner

            }
        });

        Button getSpinner = findViewById(R.id.bt_getSpinner);
        getSpinner.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                for (int i = 0; i < mSpinners.size(); i++) {      // Read all spinners
                    Spinner spinner = mSpinners.get(i);
                    Log.i("TAG", spinner.getSelectedItem().toString());
                }
            }
        });
    }

    private Spinner makeSpinner() {


        //opens csv
        InputStream inputStream = getResources().openRawResource(R.raw.shopitems);
        CSVFile csvFile = new CSVFile(inputStream);
        List<String> itemList = csvFile.read();
        MyListAdapter adapter = new MyListAdapter(this, R.layout.listrow, R.id.txtid, itemList);
        Spinner spinner = (Spinner) findViewById(R.id.spinner);
        spinner.setAdapter(adapter);

        return spinner;



    }

    private class CSVFile {
        InputStream inputStream;

        public CSVFile(InputStream inputStream){
            this.inputStream = inputStream;
        }

        public List<String> read(){

            List<String> resultList = new ArrayList<String>();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            try {
                String line;
                while ((line = reader.readLine()) != null) {
                    String[] row = line.split(",");
                    resultList.add(row[1]);
                }
            }
            catch (IOException e) {
                Log.e("Main",e.getMessage());
            }
            finally {
                try {
                    inputStream.close();
                }
                catch (IOException e) {
                    Log.e("Main",e.getMessage());
                }
            }
            return resultList;
        }
    }}

mylistadapter代码

public class MyListAdapter extends ArrayAdapter<String> {
    int groupid;
    List<String> items;
    Context context;
    String path;

    public MyListAdapter(Context context, int vg, int id, List<String> items) {
        super(context, vg, id, (List<String>) items);
        this.context = context;
        groupid = vg;
        this.items = items;

    }

    static class ViewHolder {
        public TextView textid;
        public TextView textname;

    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        {





            View rowView = convertView;
            if (rowView == null) {
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                rowView = inflater.inflate(groupid, parent, false);
                ViewHolder viewHolder = new ViewHolder();
                viewHolder.textid = (TextView) rowView.findViewById(R.id.txtid);
                viewHolder.textname = (TextView) rowView.findViewById(R.id.txtname);
                rowView.setTag(viewHolder);
            }
            // Fill data in the drop down.
            ViewHolder holder = (ViewHolder) rowView.getTag();
            String row = items.get(position);
            //holder.textid.setText(row[0]); prints aisle number, dont need

            holder.textname.setText(row);


            return rowView;
        }

    }

}

Answer 1

如下更改您的 makeSpinner() 方法:

private Spinner makeSpinner() {
    //opens csv
    InputStream inputStream = getResources().openRawResource(R.raw.shopitems);
    CSVFile csvFile = new CSVFile(inputStream);
    List<String> itemList = csvFile.read();

    //Create new spinner
    Spinner spinner = new Spinner(this, Spinner.MODE_DROPDOWN);

    // Setup layout
    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT);
    spinner.setLayoutParams(layoutParams);
    MyListAdapter adapter = new MyListAdapter(this, R.layout.listrow, R.id.txtid, itemList);

    spinner.setAdapter(adapter);

    //Add it to your list of spinners so you can retrieve their data when you click the getSpinner button
    mSpinners.add(spinner);
    return spinner;
}

此外，此 R.id.spinner 目前无用。

编辑:回答评论中的问题:同时添加按钮或复选框

创建复选框方法:

private CheckBox makeCheckbox() {
    //Create new Checkbox
    CheckBox checkbox = new CheckBox(this);

    // Setup layout
    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT);
    checkbox.setLayoutParams(layoutParams);
    checkbox.setText("YourCheckboxText"); //TODO Change to what you want
    return checkbox
}

创建 AppCompatButton 方法:

private AppCompatButton makeButton() {
    //Create new Button
    AppCompatButton button = new AppCompatButton(this);

    // Setup layout
    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
            LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT);
    button.setLayoutParams(layoutParams);
    button.setText("YourButtonText"); //TODO Change to what you want
    return button;
}

每当您想添加按钮或复选框时，添加此代码:

    //Add a new button
    AppCompatButton newButton = makeButton();
    mLinearLayout.addView(newButton);      // Add another button

    //Add a new checkbox
    CheckBox newCheckbox = makeCheckbox();
    mLinearLayout.addView(newCheckbox);      // Add another checkbox