android-无法启动活动ComponentInfo…NullPointerException

概述我正在尝试用textview填充单个listview,但是在第60行出现以下错误,即listView.setAdapter(adapter);这是我完整的日志.04-1610:51:38.953:E/AndroidRuntime(3068):FATALEXCEPTION:main04-1610:51:38.953:E/AndroidRuntime(3068)

我正在尝试用textvIEw填充单个ListvIEw,但是在第60行出现以下错误,即

    ListVIEw.setAdapter(adapter);                                

这是我完整的日志.

04-16 10:51:38.953: E/AndroIDRuntime(3068): FATAL EXCEPTION: main04-16 10:51:38.953: E/AndroIDRuntime(3068): java.lang.RuntimeException: Unable to start activity ComponentInfo{}: java.lang.NullPointerException04-16 10:51:38.953: E/AndroIDRuntime(3068):     at androID.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at androID.app.ActivityThread.access00(ActivityThread.java:117)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:935)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at androID.os.Handler.dispatchMessage(Handler.java:99)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at androID.os.Looper.loop(Looper.java:130)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at androID.app.ActivityThread.main(ActivityThread.java:3687)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at java.lang.reflect.Method.invokeNative(Native Method)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at java.lang.reflect.Method.invoke(Method.java:507)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:600)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at dalvik.system.NativeStart.main(Native Method)04-16 10:51:38.953: E/AndroIDRuntime(3068): Caused by: java.lang.NullPointerException04-16 10:51:38.953: E/AndroIDRuntime(3068):     at s..onCreate(Urgence.java:60)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at androID.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)04-16 10:51:38.953: E/AndroIDRuntime(3068):     at androID.app.ActivityThread.performlaunchActivity(ActivityThread.java:1615)04-16 10:51:38.953: E/AndroIDRuntime(3068):     ... 11 more

这是我的清单课程

public class ListClass extends Activity {    // Array of strings storing country names    String[] countrIEs = new String[] {            "Services opposition", "Service Carte bancaire a l'etranger"    };    // Array of integers points to images stored in /res/drawable-ldpi/    int[] flags = new int[]{            R.drawable.arrow,            R.drawable.arrow    };    /** Called when the activity is first created. */    @OverrIDe    public voID onCreate(Bundle savedInstanceState)     {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.urgence);        // Each row in the List stores country name, currency and flag        List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>();                for(int i=0;i<2;i++){            HashMap<String, String> hm = new HashMap<String,String>();            hm.put("txt", countrIEs[i]);            hm.put("flag", Integer.toString(flags[i]) );                        aList.add(hm);                }        // Keys used in Hashmap        String[] from = { "txt","flag"};        // IDs of vIEws in ListvIEw_layout        int[] to = { R.ID.single_text,R.ID.single_image};                // Instantiating an adapter to store each items        // R.layout.ListvIEw_layout defines the layout of each item        SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), aList, R.layout.ListvIEw_layout, from, to);        // Getting a reference to ListvIEw of main.xml layout file        ListVIEw ListVIEw = ( ListVIEw ) findVIEwByID(R.ID.List);        // Setting the adapter to the ListVIEw        ListVIEw.setAdapter(adapter);                                    }}

谁知道为什么我的适配器为空

更新：
这是我的xml文件中的列表视图

<ListVIEw     androID:ID="@androID:ID/List"    androID:layout_wIDth="fill_parent"    androID:layout_height="wrap_content"/>

解决方法:

当活动xml中的ID与java类中引用的ID不同时,会看到此错误.

更改以下行

androID:ID="@androID:ID/List"

至

androID:ID="@+ID/List"

在您的XML文件中.

总结

以上是内存溢出为你收集整理的android-无法启动活动ComponentInfo…NullPointerException全部内容，希望文章能够帮你解决android-无法启动活动ComponentInfo…NullPointerException所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。