android - android代码我想尝试计算但是当我在itemselection listener case0中初始化cal1（）方法时它崩溃了请告诉我解决方案

Question

public class MainActivity extends AppCompatActivity {



    Spinner s1,s2;
    TextView t1,t2,t3;
    String ops1,ops2;
    String[] op1={"Inclusive","+3%","+5%","+12%","+18%","+28%"};
    String[] op2={"Exclusive","-3%","-5%","-12%","-18%","-28%"};
ArrayAdapter<String> adapter,adapter2;
EditText e1,et1,et2,et3;
Button b1;
double a,b,c,x;

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

        s1 = (Spinner) findViewById(R.id.s1);
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, op1);
        s1.setAdapter(adapter);


        s2 = (Spinner) findViewById(R.id.s2);
        adapter2 = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, op2);
        s2.setAdapter(adapter2);

        t1=(TextView)findViewById(R.id.tc);
        t2=(TextView)findViewById(R.id.ts);
        t3=(TextView)findViewById(R.id.ti);


        e1=(EditText)findViewById(R.id.e1) ;
        et1=(EditText)findViewById(R.id.et1);
        et2=(EditText)findViewById(R.id.et2);
        et3=(EditText)findViewById(R.id.et3);




        b1=(Button)findViewById(R.id.bt1);
        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                t1.setText("CGST");
                t2.setText("SGST");
                t3.setText("IGST");

            }
        });

      s1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
          @Override
          public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

              switch (position)
              {
                  case 0:

                      t1.setText("CGST(1.5%)");
                      t2.setText("SGST(1.5%)");
                      t3.setText("IGST(3%)");

                      cal1(); //error pop due to this

                      break;
                  case 1:

                      t1.setText("CGST(2.5%)");
                      t2.setText("SGST(2.5%)");
                      t3.setText("IGST(5%)");
                      break;
                  case 2:

                      t1.setText("CGST(6%)");
                      t2.setText("SGST(6%)");
                      t3.setText("IGST(12%)");

                      break;
                  case 3:
                      t1.setText("CGST(9%)");
                      t2.setText("SGST(9%)");
                      t3.setText("IGST(18%)");
                      break;
                  case 4:

                      t1.setText("CGST(14%)");
                      t2.setText("SGST(14%)");
                      t3.setText("IGST(28%)");
                      break;
              }



          }

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

          }
      });


      s2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
          @Override
          public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

              switch (position)
              {
                  case 0:

                      t1.setText("CGST(-1.5%)");
                      t2.setText("SGST(-1.5%)");
                      t3.setText("IGST(-3%)");
                      break;
                  case 1:

                      t1.setText("CGST(-2.5%)");
                      t2.setText("SGST(-2.5%)");
                      t3.setText("IGST(-5%)");
                      break;
                  case 2:

                      t1.setText("CGST(-6%)");
                      t2.setText("SGST(-6%)");
                      t3.setText("IGST(-12%)");

                      break;
                  case 3:
                      t1.setText("CGST(-9%)");
                      t2.setText("SGST(-9%)");
                      t3.setText("IGST(-18%)");
                      break;
                  case 4:

                      t1.setText("CGST(-14%)");
                      t2.setText("SGST(-14%)");
                      t3.setText("IGST(-28%)");
                      break;
              }
          }

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

          }
      });

    }

    private void cal1()
    {

        x=Double.parseDouble(e1.getText().toString()); //from here

    }


}

请查看//错误，就像它使应用程序崩溃一样我想计算但当我在项目选择侦听器案例中初始化 cal1() 方法时：0 它崩溃请告诉我解决方案获得解决方案后请给出一定的建议采用不同的方法后，它再次崩溃

标签： android

Answer 1

-> 在您的代码中，将您的开关案例从 {0,1,2,3,4} 更改为 {1,2,3,4,5}，因为位置 0 是数组的第 0 个索引。

 s1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
          @Override
          public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

              switch (position)
              {
                  case 1:

                      t1.setText("CGST(1.5%)");
                      t2.setText("SGST(1.5%)");
                      t3.setText("IGST(3%)");

                      cal1(); //error pop due to this

                      break;
                  case 2:

                      t1.setText("CGST(2.5%)");
                      t2.setText("SGST(2.5%)");
                      t3.setText("IGST(5%)");
                      break;
                  case 3:

                      t1.setText("CGST(6%)");
                      t2.setText("SGST(6%)");
                      t3.setText("IGST(12%)");

                      break;
                  case 4:
                      t1.setText("CGST(9%)");
                      t2.setText("SGST(9%)");
                      t3.setText("IGST(18%)");
                      break;
                  case 5:

                      t1.setText("CGST(14%)");
                      t2.setText("SGST(14%)");
                      t3.setText("IGST(28%)");
                      break;
              }



          }

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

          }
      });


      s2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
          @Override
          public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

              switch (position)
              {
                  case 1:

                      t1.setText("CGST(-1.5%)");
                      t2.setText("SGST(-1.5%)");
                      t3.setText("IGST(-3%)");
                      break;
                  case 2:

                      t1.setText("CGST(-2.5%)");
                      t2.setText("SGST(-2.5%)");
                      t3.setText("IGST(-5%)");
                      break;
                  case 3:

                      t1.setText("CGST(-6%)");
                      t2.setText("SGST(-6%)");
                      t3.setText("IGST(-12%)");

                      break;
                  case 4:
                      t1.setText("CGST(-9%)");
                      t2.setText("SGST(-9%)");
                      t3.setText("IGST(-18%)");
                      break;
                  case 5:

                      t1.setText("CGST(-14%)");
                      t2.setText("SGST(-14%)");
                      t3.setText("IGST(-28%)");
                      break;
              }
          }

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

          }
      });

-> 总是尝试调试你的代码并找出错误。这将有助于轻松找出您的错误。