在 Android 中设置微调器 onClickListener()

2022-01-09 00:00:00 spinner onclick android java

我试图让 onClickListener 在 Spinner 上触发，但出现以下错误:

I'm trying to get an onClickListener to fire on a Spinner, but I get the following error:

Java.lang.RuntimeException 是不要为 AdapterView 调用 setOnClickListener.您可能需要 setOnItemClickListener"

Java.lang.RuntimeException is "Don't call setOnClickListener for an AdapterView. You probably want setOnItemClickListener instead,"

我确定我想调用 onClickListener 而不是 onItemClickListener.我在 Stack Overflow 上发现了其他人提出的问题，有没有办法将 setOnClickListener 与 Android Spinner 一起使用?

I'm sure I want to call onClickListener and NOT onItemClickListener. I found a question asked by someone else on Stack Overflow, Is there a way to use setOnClickListener with an Android Spinner?

答案是:

您必须设置 Click底层视图上的监听器(通常是一个带有 id 的 TextView:android.R.id.text1) 的微调器.到这样做:

You will have to set the Click listener on the underlying view (normally a TextView with id: android.R.id.text1) of the spinner. To do so:

在构造函数(带属性)创建通过提供布局的微调器android.R.layout.simple_spinner_item做一个 findViewById(android.R.id.text1)获取 TextView 现在设置onClickListener 到 TextView

Create a custom Spinner In the constructor (with attributes) create the spinner by supplying the layout android.R.layout.simple_spinner_item Do a findViewById(android.R.id.text1) to get the TextView Now set the onClickListener to the TextView

我已经尝试了那里提到的答案，但它似乎不起作用.执行 findViewById() 后，我得到一个指向 TextView 的空指针.

I have tried the answer noted there, but it doesn't seem to work. I get a null pointer to the TextView after I do the findViewById().

这就是我正在做的:

Spinner spinner = (Spinner) findViewById(R.id.spinner);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.layoutspinner,dataArray);

spinner.setAdapter(adapter);

TextView SpinnerText = (TextView)findViewById(R.id.spinnerText);
if (SpinnerText == null) {
    System.out.println("Not found");
}
else {
    SpinnerText.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            //Do something
        }
    });
}

文件 layoutspinner.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
                  android:id="@+id/spinnerText"
                  android:singleLine ="true"
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:textSize="6pt"
                  android:gravity="right"/>

我做错了什么?

我是 Stack Overflow 的新手，我没有找到任何方法可以向其他线程发布附加问题(或评论，因为我需要很少的代表)所以我开始了一个新问题.

I'm new to Stack Overflow, I didn't find any way to post an aditional question to the other thread (or comment since I have to little rep) so I started a new question.

根据建议，我尝试了这个:

Per recomendation I tried this:

int a = spinnerMes.getCount();
int b = spinnerMes.getChildCount();
System.out.println("Count = " + a);
System.out.println("ChildCount = " + b);
for (int i = 0; i < b; i++) {
    View v = spinnerMes.getChildAt(i);
    if (v == null) {
        System.out.println("View not found");
    }
    else {
        v.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Click code
            }
        });
    }
}

但是 LogCat 没有显示出有希望的结果.

But LogCat isn't showing promising results.

10-14 16:09:08.127: INFO/System.out(3116): Count = 7
10-14 16:09:08.127: INFO/System.out(3116): ChildCount = 0

我在 API 级别 7 和 8 上对此进行了测试，结果相同.

I have tested this on API levels 7 and 8 with the same results.

推荐答案

以下是你想要的，但并不理想.

The following works how you want it, but it is not ideal.

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方式，我们可以制定出更好的解决方案.

Let me know exactly how you need the spinner to behave, and we can work out a better solution.

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