Android 带有XmlPullParser崩溃应用程序的listView

下一个代码应该将数据解析为

listView

我正在使用

XmlPullParser

方法，但当我运行此活动时，应用程序崩溃：（我在另一个类中使用了相同的代码，工作得很好，但我不知道原因？）？？

logCat

将我停在：

rewardsList.setAdapter（adapter）；

xmlLayout： 奖励：

奖励清单

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView
            android:id="@+id/t3"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:gravity="left"
            android:layout_weight="1"
            android:layout_margin="1dp"/>


        <TextView
            android:id="@+id/t2"
            android:layout_width="70dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_margin="2dp"
            android:gravity="left">
        </TextView>

     <TextView
            android:id="@+id/t1"
            android:layout_width="130dp"
            android:layout_height="wrap_content"
           android:gravity="left"
           android:layout_weight="1"
            android:layout_margin="1dp"
             />    

</LinearLayout>

我试着用

textView

在没有列表的情况下运行它，它也崩溃了！！所以请大家知道为什么？？

---

我已经将该活动添加到

清单中

！

这是空指针异常。请检查Rwards.java类行132:rewardsList.setAdapter（adapter）；@AbhiThen rewardsList是正确的。检查rewards.xml中的xml listview ID该ID是xml和class中的奖励！@Abhi

10-23 06:43:54.365: E/AndroidRuntime(937):  at com.university.app.Rwards.onCreate(Rwards.java:131)
10-23 06:49:28.995: E/AndroidRuntime(1006): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.university.app/com.university.app.Rwards}: java.lang.NullPointerException
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.os.Handler.dispatchMessage(Handler.java:99)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.os.Looper.loop(Looper.java:137)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.app.ActivityThread.main(ActivityThread.java:4424)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at java.lang.reflect.Method.invokeNative(Native Method)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at java.lang.reflect.Method.invoke(Method.java:511)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at dalvik.system.NativeStart.main(Native Method)
10-23 06:49:28.995: E/AndroidRuntime(1006): Caused by: java.lang.NullPointerException
10-23 06:49:28.995: E/AndroidRuntime(1006):     at com.university.app.Rwards.onCreate(Rwards.java:132)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.app.Activity.performCreate(Activity.java:4465)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
10-23 06:49:28.995: E/AndroidRuntime(1006):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
     android:background="@drawable/bg">


    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/title_bar">

        <TextView android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:text="Rwards"/>


    </LinearLayout>



    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/white_strip_4header" >



        <TextView
            android:id="@+id/textView1"
            android:layout_width="60dp"
            android:layout_height="wrap_content"
            android:layout_weight="1.10"
            android:text="notes" />
        <TextView
            android:id="@+id/textView2"
            android:layout_width="70dp"
            android:layout_height="wrap_content"
            android:layout_weight="1.10"
            android:text="Amount owed" />
        <TextView
            android:id="@+id/textView3"
            android:layout_width="20dp"
            android:layout_height="wrap_content"
            android:layout_weight="1.10"
            android:text="month" 
            android:gravity="center"/>
        <TextView
            android:id="@+id/textView4"
            android:layout_width="20dp"
            android:layout_height="wrap_content"
            android:layout_weight="1.10"
            android:text="year" 
            android:gravity="center"/>
    </LinearLayout>


 <TextView
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />

    <ListView
        android:id="@+id/reward"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView
            android:id="@+id/t3"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:gravity="left"
            android:layout_weight="1"
            android:layout_margin="1dp"/>


        <TextView
            android:id="@+id/t2"
            android:layout_width="70dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_margin="2dp"
            android:gravity="left">
        </TextView>

     <TextView
            android:id="@+id/t1"
            android:layout_width="130dp"
            android:layout_height="wrap_content"
           android:gravity="left"
           android:layout_weight="1"
            android:layout_margin="1dp"
             />    

</LinearLayout>