問題描述

我試圖讓 onClickListener 在 Spinner 上觸發，但出現以下錯誤:

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

Java.lang.RuntimeException 是不要為 AdapterView 調用 setOnClickListener.您可能需要 setOnItemClickListener"

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

我確定我想調用 onClickListener 而不是 onItemClickListener.我在 Stack Overflow 上發現了其他人提出的問題，有沒有辦法將 setOnClickListener 與 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:

您必須設置 Click底層視圖上的監聽器(通常是一個帶有 id 的 TextView:android.R.id.text1) 的微調器.到這樣做:

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:

在構造函數(帶屬性)創建通過提供布局的微調器android.R.layout.simple_spinner_item做一個 findViewById(android.R.id.text1)獲取 TextView 現在設置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

我已經嘗試了那里提到的答案，但它似乎不起作用.執行 findViewById() 后，我得到一個指向 TextView 的空指針.

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().

這就是我正在做的:

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"/>

我做錯了什么?

我是 Stack Overflow 的新手，我沒有找到任何方法可以向其他線程發布附加問題(或評論，因為我需要很少的代表)所以我開始了一個新問題.

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.

根據建議，我嘗試了這個:

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 沒有顯示出有希望的結果.

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 級別 7 和 8 上對此進行了測試，結果相同.

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

推薦答案

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);
    }
}

讓我確切地知道您需要微調器的行為方式，我們可以制定出更好的解決方案.

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

這篇關于在 Android 中設置微調器 onClickListener()的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！