java - 如何处理多个微调器所选项目的比较？

Question

当两个微调器选择的值彼此相等时，我试图让我的应用程序显示文本或图像。

public class MainActivity extends AppCompatActivity {

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

        Spinner sp1 =(Spinner)findViewById(R.id.sp1);
        String txtFromSpinner1 = sp1.getSelectedItem().toString();

        Spinner sp2 = (Spinner)findViewById(R.id.sp2);
        String txtFromSpinner2 = sp2.getSelectedItem().toString();

        if (txtFromSpinner1.equals(1)&& txtFromSpinner2.equals(2)){

            TextView textElement = (TextView)findViewById(R.id.txResult);
            textElement.setText("3");

        }
    }
}

Answer 1

试试这个:

Spinner sp1 =(Spinner)findViewById(R.id.sp1);
Spinner sp2 = (Spinner)findViewById(R.id.sp2);
TextView textElement = (TextView)findViewById(R.id.txResult);              
Button showResult = (Button)findViewById(R.id.btnShowResult);

showResult.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
           String txtFromSpinner1 = sp1.getSelectedItem().toString();
         String txtFromSpinner2 = sp2.getSelectedItem().toString();

         if (txtFromSpinner1.equals("1")&& txtFromSpinner2.equals("2"))
                textElement.setText("3");


        }
    });