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To view a result of mathematical action

开发者 https://www.devze.com 2023-04-10 07:00 出处:网络
I\'d like to show the text containing result of addition of two values: one from onespinner selected item, and another from twospinner selected item. But eclipse shows an error in line

I'd like to show the text containing result of addition of two values: one from onespinner selected item, and another from twospinner selected item. But eclipse shows an error in line

text.setText(onespinner.getSelectedItem + twospinner.getSelectedItem);

What's the matter? Full code goes below.

public class photographer extends Activity implements OnItemSelectedListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Spinner onespinner = (Spinner) findViewById(R.id.spinner1);
    ArrayAdapter<CharSequence> unitadapter = ArrayAdapter.createFromResource(
            this, R.array.onespinner, android.R.layout.simple_spinner_item);
    unitadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    onespinner.setAdapter(unitadapter);
    onespinner.setOnItemSelectedListener(this);

    Spinner twospinner = (Spinner) findViewById(R.id.spinner2);
    ArrayAdapter<CharSequence> courseadapter = ArrayAdapter.createFromResource(
            this, R.array.twospinner, android.R.layout.simple_spinner_item);
    courseadapter.setDropDownViewResource(android.R.layout.simple_开发者_开发百科spinner_dropdown_item);
    twospinner.setAdapter(courseadapter);
    twospinner.setOnItemSelectedListener(this);



}

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

    TextView text = (TextView)findViewById(R.id.result);
    text.setText(onespinner.getSelectedItem + twospinner.getSelectedItem);

}

@Override
public void onNothingSelected(AdapterView<?> parent) {


}
 }


getSelectedItem is a method, but you are referencing it like an instance variable. You need to change your code to:

text.setText(onespinner.getSelectedItem() + twospinner.getSelectedItem());


You haven't posted the exact error, but I'm guessing that your problem is that you are trying to make a reference to onespinner and twospinner in onItemSelected and those two objects are not in the scope of that function; they are declared in onCreate.

Now, the View view argument of onItemSelected is the spinner that was clicked, but you need a reference to both spinners (not just the one that was selected). Easiest way to do this is to globally declare oneSpinner and twoSpinner and that should solve your problem.

EDIT: Also what Ted Hopp said.

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