Bedingte Spinner

Question

Ich habe ein Problem. Ich habe Spinner erstellt, und alles App läuft, ohne abzustürzen, aber es wird nicht Wert von int Preis ändern, weder setText funktioniert nicht

public class MainActivity extends AppCompatActivity implements View.OnClickListener { 

Button calculateBtn; 
EditText userEcts; 
TextView ectsPrice; 
TextView summary; 
Spinner courses; 
String cors; 
int price = 200; 

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

    userEcts = (EditText) findViewById(R.id.ects_input); 
    summary = (TextView) findViewById(R.id.text_summary); 
    courses = (Spinner) findViewById(R.id.course_spinner); 

    calculateBtn = (Button) findViewById(R.id.calculate); 
    calculateBtn.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
      //When the button is clicked, call the calculate method. 
      calculate(); 
     } 
    }); 

    final String[] courseArray = new String[4]; 
    { 
     courseArray[0] = "Preddiplomski studij Menadžment"; 
     courseArray[1] = "Preddiplomski studij Promet"; 
     courseArray[2] = "Preddiplomski Upravni studij"; 
     courseArray[3] = "Specijalistički studij Menadžment"; 
    } 

    ArrayAdapter courseAdapter = new ArrayAdapter(this, 
      android.R.layout.simple_spinner_item, courseArray); 
    courseAdapter.setDropDownViewResource(android.R.layout.select_dialog_singlechoice); 
    courses.setAdapter(courseAdapter); 

    courses.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){ 

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

      //Get item from Spinner and store in string conductorSize........ 
      cors = parent.getItemAtPosition(pos).toString(); 
      if (cors.equals(0)) { 
       ectsPrice.setText("200"); 
       price = 200; 
      } else if (cors.equals(1)) { 
       ectsPrice.setText("250"); 
       price = 250; 
      } else if (cors.equals(2)) { 
       ectsPrice.setText("300"); 
       price = 300; 
      } else if (cors.equals(3)) { 
       ectsPrice.setText("350"); 
       price = 350; 
      } else { 
       //Do nothing 
      } 
     } 

     public void onNothingSelected(AdapterView parent) { 
      // Do nothing. 
     } 
    }); 
} 

public void calculate() { 
    //gets entered text from the EditText,and convert to integers. 
    if (!TextUtils.isEmpty(userEcts.getText().toString())) { 
     Double ects = Double.parseDouble(userEcts.getText().toString()); 
     //do the calculation 
     Double calculatedPrice = ects * price; 
     //set the value to the TextView, to display on screen. 
     summary.setText("Ukupno za platit: " + Double.toString(calculatedPrice) + "kn"); 
    } else { 
     Toast.makeText(this, "Niste unijeli broj bodova", Toast.LENGTH_SHORT).show(); 
    } 
} 

@Override 
public void onClick(View v) { 
    calculate(); 
} 

}

Also, bei der Auswahl Artikel auf Position 0 Ich möchte Text auf einen bestimmten Text setzen und den Preis ändern. Kann jemand helfen?

Answer 1

Verwenden Sie die Positionsnummer, um den Zustand zu überprüfen.

String[] courseArray = new String[4]; 
    { 
     courseArray[0] = "Preddiplomski studij Menadžment"; 
     courseArray[1] = "Preddiplomski studij Promet"; 
     courseArray[2] = "Preddiplomski Upravni studij"; 
     courseArray[3] = "Specijalistički studij Menadžment"; 
    } 

    ArrayAdapter courseAdapter = new ArrayAdapter(this, 
      android.R.layout.simple_spinner_item, courseArray); 
    courseAdapter.setDropDownViewResource(android.R.layout.select_dialog_singlechoice); 
    courses.setAdapter(courseAdapter); 

    courses.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){ 

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

      //Get item from Spinner and store in string conductorSize........ 
      cors = parent.getItemAtPosition(pos).toString(); 
      if (cors.equals(courseArray[0])) { 
       ectsPrice.setText("200"); 
       price = 200; 
      } else if (cors.equals(courseArray[1])) { 
       ectsPrice.setText("250"); 
       price = 250; 
      } else if (cors.equals(courseArray[2])) { 
       ectsPrice.setText("300"); 
       price = 300; 
      } else if (cors.equals(courseArray[3])) { 
       ectsPrice.setText("350"); 
       price = 350; 
      } else { 
       //Do nothing 
      } 
     } 

     public void onNothingSelected(AdapterView parent) { 
      // Do nothing. 
     } 
    }); 
} 

Answer 2

eine Switch-Anweisung verwenden:

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

     switch(pos){ 
      case 0: 
       ectsPrice.setText("200"); 
       price = 200; 
       break; 
      case 1: 
       ectsPrice.setText("250"); 
       price = 250; 
       break; 
      case 2: 
       ectsPrice.setText("300"); 
       price = 300; 
       break; 
      case 3: 
       ectsPrice.setText("350"); 
       price = 350; 
       break; 
     } 
    }