在Android中设置微调器onClickListener（）

7 回答

• 2

  这是一个有效的解决方案：

  我们设置OnTouchListener和OnKeyListener，而不是设置微调器的OnClickListener .

  spinner.setOnTouchListener(Spinner_OnTouch);
  spinner.setOnKeyListener(Spinner_OnKey);
  

  和听众：

  private View.OnTouchListener Spinner_OnTouch = new View.OnTouchListener() {
      public boolean onTouch(View v, MotionEvent event) {
          if (event.getAction() == MotionEvent.ACTION_UP) {
              doWhatYouWantHere();
          }
          return true;
      }
  };
  private static View.OnKeyListener Spinner_OnKey = new View.OnKeyListener() {
      public boolean onKey(View v, int keyCode, KeyEvent event) {
          if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
              doWhatYouWantHere();
              return true;
          } else {
              return false;
          }
      }
  };
  

  回复于 2024-04-27T02:43:05+08:00
• 0

  首先，微调器不支持项目点击事件 . 调用此方法将引发异常 .

  您可以使用setOnItemSelectedListener：

  Spinner s1;
  s1 = (Spinner)findViewById(R.id.s1);
  int selectionCurrent = s1.getSelectedItemPosition();
  
  spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
          @Override
          public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
              if (selectionCurrent != position){
                  // Your code here
              }
              selectionCurrent= position;
          }
      }
  
      @Override
      public void onNothingSelected(AdapterView<?> parentView) {
          // Your code here
      }
  });
  

  回复于 2024-04-27T02:43:05+08:00
• 11

  每当您必须在Android中单击Spinner时执行某些操作，请使用以下方法 .

  mspUserState.setOnTouchListener(new OnTouchListener() {
  
      @Override
      public boolean onTouch(View v, MotionEvent event) {
          if (event.getAction() == MotionEvent.ACTION_UP) {
              doWhatIsRequired();
          }
          return false;
      }
  });
  

  One thing to keep in mind is always to return False while using the above method. If you will return True then the dropdown items of the spinner will not be displayed on clicking the Spinner.

  回复于 2024-04-27T02:43:05+08:00
• 54

  Spinner类实现了 DialogInterface.OnClickListener ，从而有效地劫持了标准 View.OnClickListener .

  如果您没有使用子类Spinner或不打算使用，请选择其他答案 .

  否则，只需将以下代码添加到自定义Spinner：

  @Override
  /** Override triggered on 'tap' of closed Spinner */
  public boolean performClick() {
      // [ Do anything you like here ]
      return super.performClick();
  }
  

  示例：每当打开微调器时，通过Snackbar显示预先提供的提示：

  private String sbMsg=null;      // Message seen by user when Spinner is opened.
  public void setSnackbarMessage(String msg) { sbMsg=msg; }
  @Override
  /** Override triggered on 'tap' of closed Spinner */
  public boolean performClick() {
      if (sbMsg!=null && !sbMsg.isEmpty()) { /* issue Snackbar */ }
      return super.performClick();
  }
  

  

  自定义Spinner是在整个项目中以编程方式标准化Spinner外观的绝佳起点 .

  如果有兴趣，请看here

  回复于 2024-04-27T02:43:05+08:00
• 4

  我建议Spinner的所有事件都分为两种类型：

  • 用户事件（您的意思是“点击”事件） .

  • 计划活动 .

  我还建议，当你想要捕获用户事件时，你只想摆脱“程序事件” . 所以这很简单：

  private void setSelectionWithoutDispatch(Spinner spinner, int position) {
      AdapterView.OnItemSelectedListener onItemSelectedListener = spinner.getOnItemSelectedListener();
      spinner.setOnItemSelectedListener(null);
      spinner.setSelection(position, false);
      spinner.setOnItemSelectedListener(onItemSelectedListener);
  }
  

  关键时刻：你需要setSelection（position，false） . 动画参数中的“false”会立即触发事件 . 默认行为是将事件推送到事件队列 .

  回复于 2024-04-27T02:43:05+08:00
• 24

  就个人而言，我用它：

  final Spinner spinner = (Spinner) (view.findViewById(R.id.userList));
      spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
          @Override
          public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {                
  
              userSelectedIndex = position;
          }
  
          @Override
          public void onNothingSelected(AdapterView<?> parent) {
          }
      });
  

  回复于 2024-04-27T02:43:05+08:00
• 5

  以下是你想要的方式，但它并不理想 .

  public class Tester extends Activity {
  
      String[] vals = { "here", "are", "some", "values" };
      Spinner spinner;
  
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
          spinner = (Spinner) findViewById(R.id.spin);
          ArrayAdapter<String> ad = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, vals);
          spinner.setAdapter(ad);
          Log.i("", "" + spinner.getChildCount());
          Timer t = new Timer();
          t.schedule(new TimerTask() {
  
              @Override
              public void run() {
                  int a = spinner.getCount();
                  int b = spinner.getChildCount();
                  System.out.println("Count =" + a);
                  System.out.println("ChildCount =" + b);
                  for (int i = 0; i < b; i++) {
                      View v = spinner.getChildAt(i);
                      if (v == null) {
                          System.out.println("View not found");
                      } else {
                          v.setOnClickListener(new View.OnClickListener() {
  
                              @Override
                              public void onClick(View v) {
                                          Log.i("","click");
                                          }
                          });
                      }
                  }
              }
          }, 500);
      }
  }
  

  让我确切地知道您需要微调器的行为，我们可以找到更好的解决方案 .

  回复于 2024-04-27T02:43:05+08:00