Java 模型类在第二次使用时未将特定字符串传递给ListViewAdapter
这是模型课Java 模型类在第二次使用时未将特定字符串传递给ListViewAdapter,java,android,Java,Android,这是模型课 public class Video { private String videoTitle; private String videoThumb; private String videoChannel; private String videoID; // Constructor to convert JSON object into a Java class instance pu
public class Video {
private String videoTitle;
private String videoThumb;
private String videoChannel;
private String videoID;
// Constructor to convert JSON object into a Java class instance
public Video(JSONObject object) {
try {
JSONObject obj = object.getJSONObject("snippet");
this.videoTitle = obj.getString("title");
JSONObject obj3 = obj.getJSONObject("thumbnails").getJSONObject("maxres");
this.videoThumb = obj3.getString("url");
this.videoChannel = obj.getString("channelTitle");
//This is the Variable Which is not getting passed in other fragment
this.videoID = "eHarS-r_CC4";
} catch (JSONException e) {
e.printStackTrace();
}
}
public String getVideoTitle() { return videoTitle; }
public String getVideoThumb() {
return videoThumb;
}
public String getVideoChannel() {return videoChannel; }
public String getVideoID() {return videoID; }
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolderVideo holder;
if (view == null) {
LayoutInflater inflater = LayoutInflater.from(context);
view = inflater.inflate(resource, parent, false);
Log.d("videoTitle", video.getVideoTitle());
final String videoID = video.getVideoID();
Log.d("videoID", videoID);
}
*FATAL EXCEPTION: main
Process: com.example.shubi.myapplication, PID: 11808
java.lang.NullPointerException: println needs a message
at android.util.Log.println_native(Native Method)
at android.util.Log.d(Log.java:143)
at **net.moodsense.moodsense.adapter.CustomListViewVideoAdapter.getView(CustomListViewVideoAdapter.java:93)**
//This is the line where I call to show videoID in Logcat
at android.widget.AbsListView.obtainView(AbsListView.java:2404)
at android.widget.ListView.makeAndAddView(ListView.java:2052)
at android.widget.ListView.fillDown(ListView.java:786)
at android.widget.ListView.fillFromTop(ListView.java:847)
at android.widget.ListView.layoutChildren(ListView.java:1798)
at android.widget.AbsListView.onLayout(AbsListView.java:2203)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.support.constraint.ConstraintLayout.onLayout(ConstraintLayout.java:1858)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1171)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:759)
at android.view.View.layout(View.java:19692)
at android.view.ViewGroup.layout(ViewGroup.java:6057)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2521)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2230)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1416)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6845)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:966)
at android.view.Choreographer.doCallbacks(Choreographer.java:778)
at android.view.Choreographer.doFrame(Choreographer.java:713)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:952)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6798)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
09-11 09:41:29.
796 11808-11808/com.example.shubi.myapplication D/OSTracker:OS Event:crash*您需要使用BaseAdapter类的
setTaggetTag@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if ((convertView == null) || (convertView.getTag() == null)) {
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.YOUR_LIST_ITEM, null);
holder = new ViewHolder();
} else {
holder = (ViewHolder) convertView.getTag();
}
convertView.setTag(holder);
/**
* SET THE VALUES OF THE LISTVIEW'S ITEMS HERE
*/
return convertView;
}
用这个替换你的getter方法。我已经修改了它
public String getVideoTitle() { return this.videoTitle; }
public String getVideoThumb() {
return this.videoThumb;
}
public String getVideoChannel() {return this.videoChannel; }
public String getVideoID() {return this.videoID; }
希望这将对您有所帮助您能提供适配器类的完整代码吗？@ShubhamJain请查看我的解决方案，并在concernI最终发现错误时通知我。在另一个片段中，videoThumb给出空错误，所以该点的代码不会执行。