在Android中设置微调器onClickListener()

Question

我试图让一个onClickListener在Spinner上触发,但是我收到以下错误:

Java.lang.RuntimeException是"不要为AdapterView调用setOnClickListener.你可能需要setOnItemClickListener,"

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

答案说:

您必须在微调器的基础视图(通常是带有id:android.R.id.text1的TextView)上设置Click侦听器.为此:

创建自定义Spinner在构造函数(带属性)中通过提供布局android.R.layout.simple_spinner_item来创建微调器.执行findViewById(android.R.id.text1)以获取TextView现在将onClickListener设置为TextView

我已经尝试过那里提到的答案,但它似乎没有用.我在执行findViewById()后得到一个指向TextView的空指针.

这就是我正在做的事情:

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"/>

我究竟做错了什么？

我是Stack Overflow的新手,我没有找到任何办法向另一个帖子发布一个aditional问题(或评论,因为我需要很少代表)所以我开始了一个新问题.

每个推荐我试过这个:

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LogCat没有显示出有希望的结果.

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

我已经在API级别7和8上对此进行了测试,结果相同.

Answer 1

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;
        }
    }
};

Answer 2

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;
    }
});

要记住的一件事是在使用上述方法时始终返回False.如果您将返回True,则单击微调器时不会显示微调器的下拉项.

Answer 3

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) {
        }
    });  

Answer 4

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
    }
});

Answer 5

以下工作如何你想要它，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方式，我们可以制定出更好的解决方案。