I have an error: setOnItemClickListener cannot be used with a spinner, what is wrong?

Kindly 这是我下面的代码，我在下面粘贴了错误消息: 我试图使用 setOnItemClickListener的纺纱机，这是允许的吗？

@Override
public void onItemClick(AdapterView<?> arg0, View v, int index, long arg3) {
if (quantity[index]=="Meter" ){
s1="Meter";
Toast.makeText(v.getContext(), "convert from meter",Toast.LENGTH_SHORT).show();
}
}


});


convertto.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg, View v1, int index1, long arg4)
{
if ((quantity[index1]=="Meter") && (s1.equalsIgnoreCase("Meter")))
{
Toast.makeText(v1.getContext(), " to meter",Toast.LENGTH_SHORT).show();
var2=var1;
lresult.setText("" + var2);
}
}
});


}


}

这里有一些错误

FATAL EXCEPTION: main
07-04 09:48:39.912: E/AndroidRuntime(694): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.a2zunitconverter.miniproject/com.a2zunitconverter.miniproject.lenght}: java.lang.RuntimeException: setOnItemClickListener cannot be used with a spinner.
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.os.Looper.loop(Looper.java:123)
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.app.ActivityThread.main(ActivityThread.java:3683)
07-04 09:48:39.912: E/AndroidRuntime(694):  at java.lang.reflect.Method.invokeNative(Native Method)
07-04 09:48:39.912: E/AndroidRuntime(694):  at java.lang.reflect.Method.invoke(Method.java:507)
07-04 09:48:39.912: E/AndroidRuntime(694):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-04 09:48:39.912: E/AndroidRuntime(694):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-04 09:48:39.912: E/AndroidRuntime(694):  at dalvik.system.NativeStart.main(Native Method)
07-04 09:48:39.912: E/AndroidRuntime(694): Caused by: java.lang.RuntimeException: setOnItemClickListener cannot be used with a spinner.
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.widget.Spinner.setOnItemClickListener(Spinner.java:102)
07-04 09:48:39.912: E/AndroidRuntime(694):  at com.a2zunitconverter.miniproject.lenght.onCreate(lenght.java:31)
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-04 09:48:39.912: E/AndroidRuntime(694):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
07-04 09:48:39.912: E/AndroidRuntime(694):  ... 11 more

72291

小开

参见 logcat 的第一行:

java.lang.RuntimeException: setOnItemClickListener cannot be used with a spinner.

setOnItemClickListener不能与 Spinner一起使用。改为使用 setOnItemSelectedListener。

小开

把这个换了

 convertto.setOnItemClickListener(new OnItemClickListener()
{


@Override
public void onItemClick(AdapterView<?> arg, View v1, int index1, long arg4)
{
if ((quantity[index1]=="Meter") && (s1.equalsIgnoreCase("Meter")))
{


Toast.makeText(v1.getContext(), " to meter",Toast.LENGTH_SHORT).show();
var2=var1;
lresult.setText("" + var2);
}


}


});

到 onItemSelectedListener,

 convertto.setOnItemSelectedListener(new OnItemSelectedListener() {


public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
if ((quantity[index1]=="Meter") && (s1.equalsIgnoreCase("Meter")))
{


Toast.makeText(v1.getContext(), " to meter",Toast.LENGTH_SHORT).show();
var2=var1;
lresult.setText("" + var2);
}




}


public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub


}
});

似乎不能在 Spinner 中使用 itemClickListener,

Here is the error line which explains it,

07-04 09:48:39.912: E/AndroidRuntime(694): Caused by: java.lang.RuntimeException: setOnItemClickListener cannot be used with a spinner.

小开

正如@Alex 所说，你必须使用

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


}


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


}
});

或者，如果你正在使用 ButterKnife:

@OnItemSelected(R.id.spinner)
public void onSpinnerItemSelected(int index){
// ...
}

小开

科特林:

spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
print("onItemSelected position = $position id = $id")
}


override fun onNothingSelected(parent: AdapterView<*>) {


}
}

I wrote it because inline creating object from the interface is different.

小开

只需将你的实现从 setOnItemClickListener改为 setOnItemSelectedListener。你的代码应该可以正常工作，没有错误。

Java:

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


}


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


}
});

科特林:

convertto.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {


override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {


}


override fun onNothingSelected(parent: AdapterView<*>) {


}
}

小开

解决了

 spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int
i, long l) {


}


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


}
});