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저는 Android 개발이 처음이므로 문제를 해결할 수 없습니다. 나는 두 가지 속성 이름과 URL을 빈 클래스라는 비디오를 만들 :일반 목록에 모델 클래스를 추가하면 오류가 발생합니다.
public class Video {
public String _name;
public String _Url;
public Video(String name, String Url)
{
_name = name;
_Url = Url;
}
public String getName()
{
return _name;
}
public String getUrl()
{
return _Url;
}
}
내가 목록에 비디오를 추가 할 때 다음 활동이 VideosListActivity를 호출에 오류가 발생되고있는 동영상을 추가하기위한 일반적인 목록을 가지고 :
public List<Video> ListResult;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Update view
setContentView(R.layout.videos);
setTitle("VIDEOS");
//--videos created here
Video NewVideo = new Video("video one","http://www.youtube.com/watch?v=cxLG2wtE7TM");
ListResult.add(NewVideo);
Log.v("VideoList", "Opened list");
이 오류는 무엇을 발생합니다됩니다 :
02-06 13:10:05.660: E/AndroidRuntime(23432): FATAL EXCEPTION: main
02-06 13:10:05.660: E/AndroidRuntime(23432): java.lang.RuntimeException: Unable to start activity ComponentInfo{uk.co.mosquitodigital.panic/uk.co.mosquitodigital.panic.VideoListActivity}: java.lang.NullPointerException
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2225)
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2260)
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.app.ActivityThread.access$600(ActivityThread.java:139)
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1277)
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.os.Handler.dispatchMessage(Handler.java:99)
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.os.Looper.loop(Looper.java:156)
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.app.ActivityThread.main(ActivityThread.java:5045)
02-06 13:10:05.660: E/AndroidRuntime(23432): at java.lang.reflect.Method.invokeNative(Native Method)
02-06 13:10:05.660: E/AndroidRuntime(23432): at java.lang.reflect.Method.invoke(Method.java:511)
02-06 13:10:05.660: E/AndroidRuntime(23432): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-06 13:10:05.660: E/AndroidRuntime(23432): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-06 13:10:05.660: E/AndroidRuntime(23432): at dalvik.system.NativeStart.main(Native Method)
02-06 13:10:05.660: E/AndroidRuntime(23432): Caused by: java.lang.NullPointerException
02-06 13:10:05.660: E/AndroidRuntime(23432): at uk.co.mosquitodigital.panic.VideoListActivity.onCreate(VideoListActivity.java:31)
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.app.Activity.performCreate(Activity.java:4543)
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071)
02-06 13:10:05.660: E/AndroidRuntime(23432): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2181)
02-06 13:10:05.660: E/AndroidRuntime(23432): ... 11 more
필드를 개인적으로 만들고 Java 명명 규칙을 준수하는 것이 이상적입니다. –