Android 为什么微调器活动未运行?错误:很遗憾,spinnerapp已停止
我的问题是,当我运行spinner代码时,它显示错误 “很遗憾,spinnerApp已停止” 下面是我的XML文件:Android 为什么微调器活动未运行?错误:很遗憾,spinnerapp已停止,android,android-studio,spinner,android-spinner,Android,Android Studio,Spinner,Android Spinner,我的问题是,当我运行spinner代码时,它显示错误 “很遗憾,spinnerApp已停止” 下面是我的XML文件: <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Spinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="113dp"
android:layout_alignParentLeft="true" />
</RelativeLayout>
下面是my strings.xml:
<resources>
<string name="app_name">SpinnerApp</string>
<string-array name="myarray">
<item value="Oswald">Oswald</item>
<item value="Noddy">Noddy</item>
<item value="Shinchan">Shinchan</item>
<item value="Doraemon">Doraemon</item>
<item value="Detective Conan">Detective Conan</item>
<item value="Power puff girls">Power puff girls</item>
<item value="Ojarumaru">Ojarumaru</item>
<item value="Bob the builder">Bob the builder</item>
<item value="Asari chan">Asari chan</item>
<item value="Maruko chan">Maruko chan</item>
<item value="Mighty masked cat niyander">Mighty masked cat niyander</item>
</string-array>
</resources>
斯宾内拉普
奥斯瓦尔德
诺迪
蜡笔小新
哆啦A梦
柯南侦探
粉扑女孩
反斗小王子
建筑师巴布
陈旭日
樱桃小丸子
强大的蒙面猫尼扬德
下面是我的.java文件:
package com.example.mypc.spinnerapp;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
Spinner sp;
ArrayAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sp=(Spinner)findViewById(R.id.spinner);
List<String> list=new ArrayList<String>();
list.add("Hello");
list.add("World");
list.add("How");
list.add("are");
list.add("you");
String []arr=getResources().getStringArray(R.array.myarray);
ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,list);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sp.setAdapter(adapter);
sp.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
sp.setSelection(position);
}
});
}
}
package com.example.mypc.spinnerapp;
导入android.support.v7.app.AppActivity;
导入android.os.Bundle;
导入android.view.view;
导入android.widget.*;
导入java.util.ArrayList;
导入java.util.List;
公共类MainActivity扩展了AppCompatActivity{
纺纱机;
阵列适配器;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sp=(微调器)findViewById(R.id.Spinner);
列表=新的ArrayList();
添加(“你好”);
列表。添加(“世界”);
列表。添加(“如何”);
列表。添加(“是”);
列表。添加(“您”);
字符串[]arr=getResources().getStringArray(R.array.myarray);
ArrayAdapter=新的ArrayAdapter(这是android.R.layout.simple\u微调器\u项,列表);
setDropDownViewResource(android.R.layout.simple\u微调器\u下拉菜单\u项);
sp.setAdapter(适配器);
sp.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父对象、视图、整型位置、长id){
警司选举(职位);
}
});
}
}
我的代码有什么问题?根本原因:
Caused by: java.lang.RuntimeException: setOnItemClickListener cannot be used with a spinner.
解决方案:改用setOnItemSelectedListener
更改您的代码:
从
sp.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父对象、视图、整型位置、长id){
警司选举(职位);
}
});
到
sp.setOnItemSelectedListener(新的AdapterView.OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
}
@凌驾
未选择公共无效(AdapterView父级){
}
});
在询问与崩溃相关的问题时,始终共享堆栈跟踪。进入logcat并将其复制粘贴到此处,以便我们可以看到
sp.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
sp.setSelection(position);
}
});
sp.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});