Android弹出窗口列表视图
我的项目中有一个弹出窗口。我在列表视图中得到了一个组帖子。如果我在listview中点击一个帖子,弹出窗口将打开,其中包括帖子、帖子评论和喜欢的内容;用户可以在该窗口中喜欢并为该帖子写评论。但我无法将我的评论数据绑定到弹出窗口的listview。以下是我的代码和logcat数据:Android弹出窗口列表视图,android,facebook,listview,facebook-comments,Android,Facebook,Listview,Facebook Comments,我的项目中有一个弹出窗口。我在列表视图中得到了一个组帖子。如果我在listview中点击一个帖子,弹出窗口将打开,其中包括帖子、帖子评论和喜欢的内容;用户可以在该窗口中喜欢并为该帖子写评论。但我无法将我的评论数据绑定到弹出窗口的listview。以下是我的代码和logcat数据: ListView lstcomment = (ListView)popup.getContentView().findViewById(R.id.lstcomments); CommentAda
ListView lstcomment = (ListView)popup.getContentView().findViewById(R.id.lstcomments);
CommentAdapter cmm = new CommentAdapter(this, commentarName, commentarPicture, commentarComment);
System.out.println(cmm.getCount());
if(cmm.getCount()>0)
{
lstcomment.setAdapter(cmm);
}
else
{
lstcomment.setVisibility(View.GONE);
nocomment.setVisibility(View.VISIBLE);
}
Logcat
08-25 02:54:27.680: E/AndroidRuntime(21581): FATAL EXCEPTION: main
08-25 02:54:27.680: E/AndroidRuntime(21581): java.lang.NullPointerException
08-25 02:54:27.680: E/AndroidRuntime(21581): at com.invemo.vodafonelivecoursetest.CommentAdapter.getCount(CommentAdapter.java:39)
08-25 02:54:27.680: E/AndroidRuntime(21581): at com.invemo.vodafonelivecoursetest.MainActivity.showFbPopup(MainActivity.java:1342)
08-25 02:54:27.680: E/AndroidRuntime(21581): at com.invemo.vodafonelivecoursetest.MainActivity.access$9(MainActivity.java:1297)
08-25 02:54:27.680: E/AndroidRuntime(21581): at com.invemo.vodafonelivecoursetest.MainActivity$3.onItemClick(MainActivity.java:343)
08-25 02:54:27.680: E/AndroidRuntime(21581): at android.widget.AdapterView.performItemClick(AdapterView.java:315)
08-25 02:54:27.680: E/AndroidRuntime(21581): at android.widget.AbsListView.performItemClick(AbsListView.java:1058)
08-25 02:54:27.680: E/AndroidRuntime(21581): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2514)
08-25 02:54:27.680: E/AndroidRuntime(21581): at android.widget.AbsListView$1.run(AbsListView.java:3168)
08-25 02:54:27.680: E/AndroidRuntime(21581): at android.os.Handler.handleCallback(Handler.java:605)
08-25 02:54:27.680: E/AndroidRuntime(21581): at android.os.Handler.dispatchMessage(Handler.java:92)
08-25 02:54:27.680: E/AndroidRuntime(21581): at android.os.Looper.loop(Looper.java:137)
08-25 02:54:27.680: E/AndroidRuntime(21581): at android.app.ActivityThread.main(ActivityThread.java:4425)
08-25 02:54:27.680: E/AndroidRuntime(21581): at java.lang.reflect.Method.invokeNative(Native Method)
08-25 02:54:27.680: E/AndroidRuntime(21581): at java.lang.reflect.Method.invoke(Method.java:511)
08-25 02:54:27.680: E/AndroidRuntime(21581): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-25 02:54:27.680: E/AndroidRuntime(21581): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:606)
08-25 02:54:27.680: E/AndroidRuntime(21581): at dalvik.system.NativeStart.main(Native Method)
如果我通过System.out.println将注释数据写入logcat,我可以获取数据,但无法将它们写入listview
我的适配器代码:
package com.invemo.vodafonelivecoursetest;
public class CommentAdapter extends BaseAdapter {
private Activity activity;
private String[] profilePicture;
private String[] contentMessage;
private String[] sender;
private static LayoutInflater inflater=null;
public ImageLoader imageLoader;
public CommentAdapter(Activity a, String[] senders, String[] profilePictures, String[] announceContents) {
activity = a;
this.profilePicture=profilePictures;
this.contentMessage=announceContents;
this.sender=senders;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader=new ImageLoader(activity.getApplicationContext());
}
@Override
public int getCount() {
return sender.length;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
public static class ViewHolder {
public TextView textTitle;
public ImageView image;
public TextView contentArea;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
ViewHolder holder;
if (convertView == null) {
vi = inflater.inflate(R.layout.announce_item, null);
holder = new ViewHolder();
holder.textTitle = (TextView) vi.findViewById(R.id.textView1);
holder.image = (ImageView) vi.findViewById(R.id.imageView1);
holder.contentArea=(TextView)vi.findViewById(R.id.textView2);
vi.setTag(holder);
} else
holder = (ViewHolder) vi.getTag();
holder.textTitle.setText(sender[position]);
holder.contentArea.setText(contentMessage[position]);
holder.contentArea.setAutoLinkMask(Linkify.WEB_URLS);
holder.image.setTag(profilePicture[position]);
imageLoader.DisplayImage(profilePicture[position], activity, holder.image);
return vi;
}
}
看起来commentarName必须为null。确实要在count方法调用.length之前为其赋值吗?适配器的getCount函数中存在空指针异常。发布代码。很抱歉,我使用了私有数组的访问修饰符,因此适配器无法访问数组。在这种情况下,访问修饰符应该无关紧要。即使commentarName是私有的,您也会在其值为null时将其传递给CommentAdapter的构造函数。在我将ArrayList修饰符从private更改为public之后。问题已经解决了。