Question

我有九个具有相同功能的微调器，输入值为int数组。

所以，我用＆＃39;编写了代码。环。我觉得这很有效。但它没有用。

当我执行此操作并检查微调器时，int数组没有变化。

如何使用＆＃39;为＆＃39;输入值到int数组？循环？

{ 
"dev": {
  "public": {
    "facebook": {
      "appId": "abc123"
     }
   },
  "private": {
    "facebook": {
      "secret": "456def789"
     }
   }
 },
"prod": {
  "public": {
    "facebook": {
      "appId": "def234"
     }
   },
  "private": {
    "facebook": {
      "secret": "789ghi101112"
     }
   }
}

Answer 1

这不起作用的原因

values [num] = position;

当事件侦听器触发时，num值始终为9。

您可以创建一个实现侦听器接口的内部类，并在构造函数上分配索引变量，如下所示：

    private class IndexedItemSelectedListener implements AdapterView.OnItemSelectedListener {

    private final int index;

    public IndexedItemSelectedListener(int index) {
        this.index = index;
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        values[index] = position;
    }

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

    }
}

并像这样使用它：

        //OnItemSelectedListener
    for (int i = 0; i < spinner.length; i++) {
        spinner[i].setOnItemSelectedListener(new IndexedItemSelectedListener(i));
    }

Answer 2

试试这个......

<强> 1。 activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent">

   <LinearLayout
       android:id="@+id/spinner_container"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_centerInParent="true"
       android:orientation="vertical"/>

   <TextView
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="Dynamic Spinner"
       android:id="@+id/textView3"
       android:textColor="#000000"
       android:textSize="18sp"
       android:layout_alignParentTop="true"
       android:layout_centerHorizontal="true"
       android:layout_marginTop="64dp" />

</RelativeLayout>

<强> 2.MainActivity.java

public class MainActivity extends AppCompatActivity {

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

    GenerateView();
}


private void GenerateView() {

    mContainer = (LinearLayout)findViewById(R.id.spinner_container);
    LinearLayout.LayoutParams mRowLayoutParams = new LinearLayout.LayoutParams(TableRow.LayoutParams.MATCH_PARENT,
            TableRow.LayoutParams.WRAP_CONTENT);
    mRowLayoutParams.gravity = Gravity.CENTER_HORIZONTAL;
    mRowLayoutParams.setMargins(8, 8, 8, 8);

    String[] ITEMS = {"Item 1", "Item 2", "Item 3", "Item 4", "Item 5", "Item 6"};
    ArrayAdapter<String> adapter0 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, ITEMS);
    adapter0.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    for (int i = 0; i < 9; i++) {
        Spinner spinner = new Spinner(this);
        spinner.setId(i);
        spinner.setAdapter(adapter0);
        spinner.setOnItemSelectedListener(mOnItemSelectedListener);
        spinner.setLayoutParams(mRowLayoutParams);
        mContainer.addView(spinner);
    }

}

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

        Spinner spinner = (Spinner) parent;

        switch (spinner.getId()) {
            case 0:
                shpwToast(spinner.getSelectedItem().toString());
                break;
            case 1:
                shpwToast(spinner.getSelectedItem().toString());
                break;
            case 3:
                shpwToast(spinner.getSelectedItem().toString());
                break;
            case 4:
                shpwToast(spinner.getSelectedItem().toString());
                break;
            case 5:
                shpwToast(spinner.getSelectedItem().toString());
                break;
            case 6:
                shpwToast(spinner.getSelectedItem().toString());
                break;
            case 7:
                shpwToast(spinner.getSelectedItem().toString());
                break;
            case 8:
                shpwToast(spinner.getSelectedItem().toString());
                break;
            case 9:
                shpwToast(spinner.getSelectedItem().toString());
                break;
        }
    }

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

    }
  };

  private void shpwToast(String content) {
    Toast.makeText(MainActivity.this, "Item Selected : " + content, Toast.LENGTH_SHORT).show();
   }

  }

第3。结果

快乐的编码......

我不能通过＆＃39;在＆＃39;中设置onItemSelectedListener。环

2 个答案: