listview OnItemClick列表工具无法正常工作

时间：2016-03-08 07:41:26

标签： android listview onitemclicklistener

我收到了错误。错误和代码低于任何人都可以解决这些错误。

ListView listView = (ListView) findViewById(R.id.ChatlistView);
ArrayAdapter<String> mArrayAdapter = new ArrayAdapter<String>(RoomListActivity.this,  
         R.layout.room_row,
         R.id.room,
         items);
listView.setAdapter(mArrayAdapter);

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {

        TextView textView = (TextView) view; 
        String message = "You clicked # " + position + ", which is string: " + textView.getText().toString();
        Toast.makeText(RoomListActivity.this, message, Toast.LENGTH_LONG).show();
    }
});

room_row.xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/relativelay"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/room"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/img_room"
        android:layout_alignParentRight="true"
        android:layout_alignTop="@+id/img_room"
        android:layout_toRightOf="@+id/img_room"
        android:layout_toStartOf="@+id/img_room"
        android:gravity="left|center_vertical"
        android:textSize="16dp" />



    <ImageView
        android:id="@+id/img_room"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:src="@drawable/chat" />

    </RelativeLayout>

logcat的：

03-08 12:53:50.775: E/AndroidRuntime(716): FATAL EXCEPTION: main 
03-08 12:53:50.775: E/AndroidRuntime(716): java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView 
03-08 12:53:50.775: E/AndroidRuntime(716): at com.android.wap2mob.RoomListActivity$1$1.onItemClick(RoomListActivity.java:126) 
03-08 12:53:50.775: E/AndroidRuntime(716): at android.widget.AdapterView.performItemClick(AdapterView.java:292) 
03-08 12:53:50.775: E/AndroidRuntime(716): at android.widget.AbsListView.performItemClick(AbsListView.java:1058) 
03-08 12:53:50.775: E/AndroidRuntime(716): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2514) 
03-08 12:53:50.775: E/AndroidRuntime(716): at android.widget.AbsListView$1.run(AbsListView.java:3168) 
03-08 12:53:50.775: E/AndroidRuntime(716): at android.os.Handler.handleCallback(Handler.java:605) 
03-08 12:53:50.775: E/AndroidRuntime(716): at android.os.Handler.dispatchMessage(Handler.java:92) 
03-08 12:53:50.775: E/AndroidRuntime(716): at android.os.Looper.loop(Looper.java:137) 
03-08 12:53:50.775: E/AndroidRuntime(716): at android.app.ActivityThread.main(ActivityThread.java:4424) 
03-08 12:53:50.775: E/AndroidRuntime(716): at java.lang.reflect.Method.invokeNative(Native Method) 
03-08 12:53:50.775: E/AndroidRuntime(716): at java.lang.reflect.Method.invoke(Method.java:511) 
03-08 12:53:50.775: E/AndroidRuntime(716): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
03-08 12:53:50.775: E/AndroidRuntime(716): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
03-08 12:53:50.775: E/AndroidRuntime(716): at dalvik.system.NativeStart.main(Native Method)

4 个答案:

答案 0 :(得分：1)

  

03-08 12：53：50.775：E / AndroidRuntime（716）：致命异常：主03-08   12：53：50.775：E / AndroidRuntime（716）：java.lang.ClassCastException：   android.widget.RelativeLayout无法强制转换为   android.widget.TextView 03-08 12：53：50.775：E / AndroidRuntime（716）：

ClassCastException 是当您尝试将类从一种类型错误地转换为另一种类型时，Java程序中可能发生的异常。

问题在这里

GenTraversableOnce

试试这种方式

  TextView textView = (TextView) view;

答案 1 :(得分：0)

试试这个：

删除此行

TextView textView = (TextView) view;

替换它：

TextView textView = (TextView) view.findViewById(id_here);

答案 2 :(得分：0)

查找OnItemClick中提供的textView by View，

org.apache.catalina.core.ContainerBase startInternal
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/phoenix]]
    at java.util.concurrent.FutureTask.report(FutureTask.java:122)
    at java.util.concurrent.FutureTask.get(FutureTask.java:192)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:816)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/phoenix]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    ... 6 more
Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.addServlet(Ljava/lang/String;Ljavax/servlet/Servlet;)Ljavax/servlet/ServletRegistration$Dynamic;
    at org.springframework.boot.context.embedded.ServletRegistrationBean.onStartup(ServletRegistrationBean.java:190)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.selfInitialize(EmbeddedWebApplicationContext.java:225)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.access$000(EmbeddedWebApplicationContext.java:85)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext$1.onStartup(EmbeddedWebApplicationContext.java:209)
    at org.springframework.boot.contex2016-03-07 23:40:29.048  WARN 71400 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
ded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:55)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5513)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 6 more

将以上代码替换为以下代码

TextView textView = (TextView) view;

答案 3 :(得分：0)

java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView
当您尝试在代码中将view对象分配给TextView时发生

，只需将其更改如下：

 listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {

                TextView textView = (TextView) view.findViewById(Your textview id);
                String message = "You clicked # " + position + ", which is string: " + textView.getText().toString();
                Toast.makeText(RoomListActivity.this, message, Toast.LENGTH_LONG).show();
            }
         });
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