更改ImageView基於點擊的微調項目它不工作

Question

我有2個兩個圖像（item1.png和item2.png），我想在單擊微調項目上的項目時在ImageView中顯示每個圖像。當選擇微調控制器中的「item1」時，我想顯示「item1.png」圖像和「item2」相同的圖像。

我試圖用下面的代碼做到這一點，但它沒有工作。你知道什麼是問題嗎？

在MainActivity：

public class MainActivity extends AppCompatActivity { 

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

     Spinner spinner = (Spinner) findViewById(R.id.spinner2); 
     String string = String.valueOf(spinner.getSelectedItem()); 


     final ImageView image = (ImageView)findViewById(R.id.image); 
     int image1 = R.drawable.item1; 
     int image2 = R.drawable.item2; 

     spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
      //spinner. 
      @Override 
      public void onItemSelected(AdapterView<?> arg0, View arg1, 
             int arg2) { 
       if (arg2 == 0) { 

        image.setImageResource(R.drawable.item1); 
       } else { 
        image.setImageResource(R.drawable.item2); 
       } 
      } 
     } 
    } 
} 

活動的xml：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="com.example.ricardorei.tpc.MainActivity"> 

    <Button 
     android:id="@+id/button3" 
     android:layout_width="0dp" 
     android:layout_height="48dp" 
     android:text="Button" 
     app:layout_constraintTop_toTopOf="parent" 
     android:layout_marginTop="199dp" 
     android:layout_marginRight="58dp" 
     app:layout_constraintRight_toRightOf="parent" 
     android:layout_marginEnd="58dp" /> 

    <ImageView 
     android:id="@+id/image" 
     android:layout_width="0dp" 
     android:layout_height="220dp" 
     android:layout_marginBottom="8dp" 
     android:layout_marginEnd="8dp" 
     android:layout_marginLeft="8dp" 
     android:layout_marginRight="8dp" 
     android:layout_marginStart="8dp" 
     app:layout_constraintBottom_toBottomOf="parent" 
     app:layout_constraintHorizontal_bias="0.501" 
     app:layout_constraintLeft_toLeftOf="parent" 
     app:layout_constraintRight_toRightOf="parent" 
     app:srcCompat="@drawable/item1" /> 

    <TextView 
     android:id="@+id/textView2" 
     android:layout_width="321dp" 
     android:layout_height="28dp" 
     android:layout_marginBottom="32dp" 
     android:layout_marginLeft="32dp" 
     android:layout_marginRight="32dp" 
     android:text="Are Awesome!" 
     app:layout_constraintBottom_toTopOf="@+id/imageView2" 
     app:layout_constraintHorizontal_bias="0.517" 
     app:layout_constraintLeft_toLeftOf="parent" 
     app:layout_constraintRight_toRightOf="parent" 
     android:layout_marginStart="32dp" 
     android:layout_marginEnd="32dp" /> 

    <TextView 
     android:id="@+id/textView3" 
     android:layout_width="295dp" 
     android:layout_height="28dp" 
     android:text="TextView" 
     app:layout_constraintBaseline_toBaselineOf="@+id/button3" 
     android:layout_marginLeft="32dp" 
     app:layout_constraintLeft_toLeftOf="parent" 
     android:layout_marginStart="32dp" /> 

    <Spinner 
     android:id="@+id/spinner2" 
     android:layout_width="200dp" 
     android:layout_height="30dp" 
     android:layout_marginLeft="8dp" 
     android:layout_marginRight="134dp" 
     android:layout_marginStart="16dp" 
     android:layout_marginTop="32dp" 
     android:entries="@array/spinner_values" 
     app:layout_constraintHorizontal_bias="0.522" 
     app:layout_constraintLeft_toLeftOf="parent" 
     app:layout_constraintRight_toRightOf="parent" 
     app:layout_constraintTop_toTopOf="parent" 
     /> 



</android.support.constraint.ConstraintLayout> 

Answer 1

試圖改變OnItemSelectedListener類似下面：

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
      @Override 
      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
       switch (position) { 
        case 0: 
         image.setImageResource(R.drawable.item1); 
         break; 
        case 1: 
         image.setImageResource(R.drawable.item2); 
         break; 
        default: 
         //Default image 
         //image.setImageResource(R.drawable.item2); 
         break; 

       } 
      } 

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

      } 
     });