android - 查看数学运算的结果

Question

我想显示包含两个值相加结果的文本:一个来自 onespinner 所选项目，另一个来自 twospinner 所选项目。但是eclipse显示一行错误

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

怎么了？完整代码如下。

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_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) {


}
 }

Answer 1

getSelectedItem 是一种方法，但您像引用实例变量一样引用它。您需要将代码更改为:

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