Question

我有一个微调器（只是代码的相关部分）......

protected void onCreate(Bundle savedInstanceState) {

   Spinner to_spinner = (Spinner) findViewById(R.id.to_spinner);
   List<Unit> list = myDbHelper.getAllUnits();
   SpinnerUnitAdapter tUnitAdapter tUnitAdapter = new SpinnerUnitAdapter(this, android.R.layout.simple_spinner_item, list);

   to_spinner.setAdapter(tUnitAdapter);
   to_spinner.setOnItemSelectedListener(onItemSelectedListenerTo);
}

使用onItemSelectedListener

AdapterView.OnItemSelectedListener onItemSelectedListenerTo = new     AdapterView.OnItemSelectedListener() {

    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view,
                               int position, long id) {

        // do stuff
    }

    @Override
    public void onNothingSelected(AdapterView<?> adapter) {
    }
};

当选择一个项目时（即它说：＆＃34;做东西＆＃34;），我想设置/更改所选微调项目的文本。（注意，与设置微调器位置不一样（使用setSelection（））。

我想用

做这件事

tUnitAdapter.getView(position, ?, ?).setText("new text");

我是否在正确的轨道上？在getView中放置第二个（＆＃34; convertView＆＃34;）和第三个（＆＃34; parent＆＃34;）参数的内容。我的微调器适配器看起来像：

public class SpinnerUnitAdapter extends ArrayAdapter<Unit> {
     ...
     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         TextView label = new TextView(mContext);
         label.setTextColor(Color.BLACK);                        
       label.setTextSize(mContext.getResources().getDimension(R.dimen.list_row_font_size));
         label.setGravity(Gravity.CENTER);
         label.setText(getItem(position).getName());

         return label;
    }
}

Answer 1

Am I on the right track?

No. You should do the following steps: (in the onItemSelected method)

Update your model (the array of items you passed to the adapter) so that the item at position index takes the new name.
Issue notifyDataSetChanged on the adapter object. Alternatively, you can do this manually by ((TextView) view).setText(new_name);

Note: In onItemSelected method, adapterView points to your spinner view and view points to the row view just selected.

UPDATE #1

public void onItemSelected(AdapterView<?> adapterView, View view, int position, long id) {
    ((TextView) view).setText("new name");
}

UPDATE #2

For this, you should use Java interface to implement a callback which is called once the dialog is closed.

public void onItemSelected(AdapterView<?> adapterView, final View view, int position, long id) {
    Dialog dialog = new MyDialog(context, new MyDialog.OnItemSelectListener(){
        @Override
        public void onItemSelected(String newName){
            ((TextView) view).setText(newName);
        }
    });
    dialog.show();
}

And declare interface OnItemSelectListener in your MyDialog class.

Answer 2

您可以在单击每个项目时更改微调器的文本，以便实现onClickListener

public class SpinnerUnitAdapter extends ArrayAdapter<Unit> {
         ...
         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
             TextView label = new TextView(mContext);
             ...
             label.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                  // change label text here
                  // label.setText(...);
                }
             });
             return label;
        }
    }

希望这个帮助

Answer 3

I think I found the solution. I can just do:

public void onItemSelected(AdapterView<?> adapterView, View view,
                               int position, long id) {
    TextView tv = (TextView) adapterView.getSelectedView();
    tv.setText("new text");
}

设置微调器选定的项目文本

3 个答案: