android - How do i use relativelayout as header to listview -
i have simple app allows users top post messages others can comment on.i have 2 activities mainactivity , commentactivity.on mainactivity when user clicks on post on list view
intent intent = new intent(mainactivity.this, commentactivity.class); intent.putextra("appid", post.getobjectid()); intent.putextra("username", post.getuser().getusername()); intent.putextra("text", post.gettext()); intent.putextra("vote",integer.tostring(post.getvote())); intent.putextra("timestamp",long.tostring(post.gettimestamp())); startactivity(intent); on comment activity retrieve
string username = intent.getstringextra("username"); string text = intent.getstringextra("text"); post_id = intent.getstringextra("appid"); string sum = intent.getstringextra("vote"); string time = intent.getstringextra("timestamp"); and displays them on relative layout above listview. want relative layout scroll listview 1 . did have separate xml relative layout called header .xml separate comment_activity.xml . on commentactivity tried inflate header.xml , use header listview
view view= getlayoutinflater().inflate(r.layout.header,null); textview vote_count = (textview) view.findviewbyid(r.id.txtvote_count); textview txtusername =(textview) view.findviewbyid(r.id.txtusername_view_respond); textview statusmsg =(textview) view.findviewbyid(r.id.txtcontent_view_respond); txtusername.settext(username); statusmsg.settext(text); timestamp.settext(timeago); listview listview = (listview) findviewbyid(r.id.comment_list_view); listview.addheaderview(view); listview.setadapter(adapter); `
i java.lang.nullpointerexception. here stack trace `
04-20 20:13:29.737 20254-20254/com.example.machimanapc.howzit w/system.err? @ android.os.looper.loop(looper.java:193) 04-20 20:13:29.737 20254-20254/com.example.machimanapc.howzit w/system.err? @ android.app.activitythread.main(activitythread.java:5299) 04-20 20:13:29.737 20254-20254/com.example.machimanapc.howzit w/system.err? @ java.lang.reflect.method.invokenative(native method) 04-20 20:13:29.737 20254-20254/com.example.machimanapc.howzit w/system.err? @ java.lang.reflect.method.invoke(method.java:515) 04-20 20:13:29.739 20254-20254/com.example.machimanapc.howzit w/system.err? @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:825) 04-20 20:13:29.740 20254-20254/com.example.machimanapc.howzit w/system.err? @ com.android.internal.os.zygoteinit.main(zygoteinit.java:641) 04-20 20:13:29.740 20254-20254/com.example.machimanapc.howzit w/system.err? @ dalvik.system.nativestart.main(native method) 04-20 20:13:29.740 20254-20254/com.example.machimanapc.howzit w/system.err? caused by: java.lang.nullpointerexception 04-20 20:13:29.746 20254-20254/com.example.machimanapc.howzit w/system.err? @ com.example.machimanapc.howzit.commentactivity.oncreate(commentactivity.java:196) 04-20 20:13:29.746 20254-20254/com.example.machimanapc.howzit w/system.err? @ android.app.activity.performcreate(activity.java:5264) 04-20 20:13:29.746 20254-20254/com.example.machimanapc.howzit w/system.err? @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1088) 04-20 20:13:29.746 20254-20254/com.example.machimanapc.howzit w/system.err? @ android.app.activitythread.performlaunchactivity(activitythread.java:2302) 04-20 20:13:29.746 20254-20254/com.example.machimanapc.howzit w/system.err? ... 11 more 04-20 20:13:29.746 20254-20254/com.example.machimanapc.howzit w/dalvikvm? threadid=1: calling uncaughtexceptionhandler 04-20 20:13:29.751 20254-20254/com.example.machimanapc.howzit e/androidruntime? fatal exception: main process: com.example.machimanapc.howzit, pid: 20254 java.lang.runtimeexception: unable start activity componentinfo{com.example.machimanapc.howzit/com.example.machimanapc.howzit.commentactivity}: java.lang.nullpointerexception @ android.app.activitythread.performlaunchactivity(activitythread.java:2338) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2390) @ android.app.activitythread.access$800(activitythread.java:151) @ android.app.activitythread$h.handlemessage(activitythread.java:1321) @ android.os.handler.dispatchmessage(handler.java:110) @ android.os.looper.loop(looper.java:193) @ android.app.activitythread.main(activitythread.java:5299) @ java.lang.reflect.method.invokenative(native method) @ java.lang.reflect.method.invoke(method.java:515) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:825) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:641) @ dalvik.system.nativestart.main(native method) caused by: java.lang.nullpointerexception @ com.example.machimanapc.howzit.commentactivity.oncreate(commentactivity.java:196) @ android.app.activity.performcreate(activity.java:5264) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1088) @ android.app.activitythread.performlaunchactivity(activitythread.java:2302) at android.app.activitythread.handlelaunchactivity(activitythread.java:2390) at android.app.activitythread.access$800(activitythread.java:151) at android.app.activitythread$h.handlemessage(activitythread.java:1321) at android.os.handler.dispatchmessage(handler.java:110) at android.os.looper.loop(looper.java:193) at android.app.activitythread.main(activitythread.java:5299) at java.lang.reflect.method.invokenative(native method) at java.lang.reflect.method.invoke(method.java:515) at com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:825) at com.android.internal.os.zygoteinit.main(zygoteinit.java:641) at dalvik.system.nativestart.main(native method) 04-20 20:13:30.053 20254-23455/com.example.machimanapc.howzit d/dalvikvm? create interp thread : stack size=128kb 04-20 20:13:30.053 20254-23455/com.example.machimanapc.howzit d/dalvikvm? create new thread 04-20 20:13:30.053 20254-23455/com.example.machimanapc.howzit d/dalvikvm? new thread created 04-20 20:13:30.053 20254-23455/com.example.machimanapc.howzit d/dalvikvm? update thread list 04-20 20:13:30.055 20254-23457/com.example.machimanapc.howzit d/dalvikvm? threadid=14: interp stack @ 0x551f9000 04-20 20:13:30.055 20254-23457/com.example.machimanapc.howzit d/dalvikvm? init ref table 04-20 20:13:30.055 20254-23457/com.example.machimanapc.howzit d/dalvikvm? init mutex 04-20 20:13:30.055 20254-23457/com.example.machimanapc.howzit d/dalvikvm? threadid=14: created interp 04-20 20:13:30.055 20254-23455/com.example.machimanapc.howzit d/dalvikvm? start new thread 04-20 20:13:30.055 20254-23457/com.example.machimanapc.howzit d/dalvikvm? threadid=14: notify debugger 04-20 20:13:30.055 20254-23457/com.example.machimanapc.howzit d/dalvikvm? threadid=14 (task.background_executor-thread-13): calling run() 04-20 20:13:30.056 20254-23457/com.example.machimanapc.howzit d/dalvikvm? create interp thread : stack size=128kb 04-20 20:13:30.057 20254-23457/com.example.machimanapc.howzit d/dalvikvm? create new thread 04-20 20:13:30.057 20254-23457/com.example.machimanapc.howzit d/dalvikvm? new thread created 04-20 20:13:30.057 20254-23457/com.example.machimanapc.howzit d/dalvikvm? update thread list 04-20 20:13:30.059 20254-23458/com.example.machimanapc.howzit d/dalvikvm? threadid=15: interp stack @ 0x55219000 04-20 20:13:30.059 20254-23458/com.example.machimanapc.howzit d/dalvikvm? init ref table 04-20 20:13:30.059 20254-23458/com.example.machimanapc.howzit d/dalvikvm? init mutex 04-20 20:13:30.059 20254-23458/com.example.machimanapc.howzit d/dalvikvm? threadid=15: created interp 04-20 20:13:30.059 20254-23457/com.example.machimanapc.howzit d/dalvikvm? start new thread 04-20 20:13:30.059 20254-23458/com.example.machimanapc.howzit d/dalvikvm? threadid=15: notify debugger 04-20 20:13:30.059 20254-23458/com.example.machimanapc.howzit d/dalvikvm? threadid=15 (task.background_executor-thread-14): calling run() 04-20 20:13:30.060 20254-20272/com.example.machimanapc.howzit d/dalvikvm? create interp thread : stack size=128kb 04-20 20:13:30.060 20254-20272/com.example.machimanapc.howzit d/dalvikvm? create new thread 04-20 20:13:30.060 20254-20272/com.example.machimanapc.howzit d/dalvikvm? new thread created 04-20 20:13:30.060 20254-20272/com.example.machimanapc.howzit d/dalvikvm? update thread list 04-20 20:13:30.061 20254-23460/com.example.machimanapc.howzit d/dalvikvm? threadid=20: interp stack @ 0x55239000 04-20 20:13:30.061 20254-23460/com.example.machimanapc.howzit d/dalvikvm? init ref table 04-20 20:13:30.061 20254-23460/com.example.machimanapc.howzit d/dalvikvm? init mutex 04-20 20:13:30.061 20254-23460/com.example.machimanapc.howzit d/dalvikvm? threadid=20: created interp 04-20 20:13:30.061 20254-20272/com.example.machimanapc.howzit d/dalvikvm? start new thread 04-20 20:13:30.061 20254-23460/com.example.machimanapc.howzit d/dalvikvm? threadid=20: notify debugger 04-20 20:13:30.061 20254-23460/com.example.machimanapc.howzit d/dalvikvm? threadid=20 (task.background_executor-thread-15): calling run() 04-20 20:13:31.056 20254-23455/com.example.machimanapc.howzit d/dalvikvm? threadid=12: exiting 04-20 20:13:31.056 20254-23455/com.example.machimanapc.howzit d/dalvikvm? threadid=12: bye! 04-20 20:13:31.060 20254-23457/com.example.machimanapc.howzit d/dalvikvm? threadid=14: exiting 04-20 20:13:31.060 20254-23457/com.example.machimanapc.howzit d/dalvikvm? threadid=14: bye! 04-20 20:13:31.061 20254-23458/com.example.machimanapc.howzit d/dalvikvm? threadid=15: exiting 04-20 20:13:31.061 20254-23458/com.example.machimanapc.howzit d/dalvikvm? threadid=15: bye! 04-20 20:13:31.064 20254-23460/com.example.machimanapc.howzit d/dalvikvm? threadid=20: exiting 04-20 20:13:31.064 20254-23460/com.example.machimanapc.howzit d/dalvikvm? threadid=20: bye! `
i figured out error caused listview listview = (listview) findviewbyid(r.id.comment_list_view) should have used listview listview = (listview) findviewbyid(r.id.comment_list); thanks.
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