java - wait( ) function not running properly -
i new using wait( ); feature. thought had right, not run. cannot figure out went wrong looking @ examples. can me out, please? in advance!
public class mainactivity extends activity { private imageview splash; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.splash); initialize(); } private void initialize() { splash.setvisibility(view.visible); try { wait(5000); } catch (interruptedexception e) { e.printstacktrace(); } mainmenu(); } private void mainmenu() { setcontentview(r.layout.mainmenu); } logcat:
04-04 23:08:40.075: e/trace(2555): error opening trace file: no such file or directory (2) 04-04 23:08:48.345: e/androidruntime(2555): fatal exception: main 04-04 23:08:48.345: e/androidruntime(2555): java.lang.runtimeexception: unable start activity componentinfo{edu.virginia.hotncolduva/edu.virginia.hotncolduva.mainactivity}: java.lang.nullpointerexception 04-04 23:08:48.345: e/androidruntime(2555): @ android.app.activitythread.performlaunchactivity(activitythread.java:2180) 04-04 23:08:48.345: e/androidruntime(2555): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2230) 04-04 23:08:48.345: e/androidruntime(2555): @ android.app.activitythread.access$600(activitythread.java:141) 04-04 23:08:48.345: e/androidruntime(2555): @ android.app.activitythread$h.handlemessage(activitythread.java:1234) 04-04 23:08:48.345: e/androidruntime(2555): @ android.os.handler.dispatchmessage(handler.java:99) 04-04 23:08:48.345: e/androidruntime(2555): @ android.os.looper.loop(looper.java:137) 04-04 23:08:48.345: e/androidruntime(2555): @ android.app.activitythread.main(activitythread.java:5041) 04-04 23:08:48.345: e/androidruntime(2555): @ java.lang.reflect.method.invokenative(native method) 04-04 23:08:48.345: e/androidruntime(2555): @ java.lang.reflect.method.invoke(method.java:511) 04-04 23:08:48.345: e/androidruntime(2555): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 04-04 23:08:48.345: e/androidruntime(2555): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 04-04 23:08:48.345: e/androidruntime(2555): @ dalvik.system.nativestart.main(native method) 04-04 23:08:48.345: e/androidruntime(2555): caused by: java.lang.nullpointerexception 04-04 23:08:48.345: e/androidruntime(2555): @ edu.virginia.hotncolduva.mainactivity.initialize(mainactivity.java:24) 04-04 23:08:48.345: e/androidruntime(2555): @ edu.virginia.hotncolduva.mainactivity.oncreate(mainactivity.java:19) 04-04 23:08:48.345: e/androidruntime(2555): @ android.app.activity.performcreate(activity.java:5104) 04-04 23:08:48.345: e/androidruntime(2555): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1080) 04-04 23:08:48.345: e/androidruntime(2555): @ android.app.activitythread.performlaunchactivity(activitythread.java:2144) 04-04 23:08:48.345: e/androidruntime(2555): ... 11 more 04-04 23:12:09.646: e/androidruntime(2639): fatal exception: main 04-04 23:12:09.646: e/androidruntime(2639): java.lang.runtimeexception: unable start activity componentinfo{edu.virginia.hotncolduva/edu.virginia.hotncolduva.mainactivity}: java.lang.nullpointerexception 04-04 23:12:09.646: e/androidruntime(2639): @ android.app.activitythread.performlaunchactivity(activitythread.java:2180) 04-04 23:12:09.646: e/androidruntime(2639): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2230) 04-04 23:12:09.646: e/androidruntime(2639): @ android.app.activitythread.access$600(activitythread.java:141) 04-04 23:12:09.646: e/androidruntime(2639): @ android.app.activitythread$h.handlemessage(activitythread.java:1234) 04-04 23:12:09.646: e/androidruntime(2639): @ android.os.handler.dispatchmessage(handler.java:99) 04-04 23:12:09.646: e/androidruntime(2639): @ android.os.looper.loop(looper.java:137) 04-04 23:12:09.646: e/androidruntime(2639): @ android.app.activitythread.main(activitythread.java:5041) 04-04 23:12:09.646: e/androidruntime(2639): @ java.lang.reflect.method.invokenative(native method) 04-04 23:12:09.646: e/androidruntime(2639): @ java.lang.reflect.method.invoke(method.java:511) 04-04 23:12:09.646: e/androidruntime(2639): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 04-04 23:12:09.646: e/androidruntime(2639): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 04-04 23:12:09.646: e/androidruntime(2639): @ dalvik.system.nativestart.main(native method) 04-04 23:12:09.646: e/androidruntime(2639): caused by: java.lang.nullpointerexception 04-04 23:12:09.646: e/androidruntime(2639): @ edu.virginia.hotncolduva.mainactivity.initialize(mainactivity.java:24) 04-04 23:12:09.646: e/androidruntime(2639): @ edu.virginia.hotncolduva.mainactivity.oncreate(mainactivity.java:19) 04-04 23:12:09.646: e/androidruntime(2639): @ android.app.activity.performcreate(activity.java:5104) 04-04 23:12:09.646: e/androidruntime(2639): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1080) 04-04 23:12:09.646: e/androidruntime(2639): @ android.app.activitythread.performlaunchactivity(activitythread.java:2144) 04-04 23:12:09.646: e/androidruntime(2639): ... 11 more 04-04 23:16:21.095: e/androidruntime(2737): fatal exception: main 04-04 23:16:21.095: e/androidruntime(2737): java.lang.runtimeexception: unable start activity componentinfo{edu.virginia.hotncolduva/edu.virginia.hotncolduva.mainactivity}: java.lang.nullpointerexception 04-04 23:16:21.095: e/androidruntime(2737): @ android.app.activitythread.performlaunchactivity(activitythread.java:2180) 04-04 23:16:21.095: e/androidruntime(2737): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2230) 04-04 23:16:21.095: e/androidruntime(2737): @ android.app.activitythread.access$600(activitythread.java:141) 04-04 23:16:21.095: e/androidruntime(2737): @ android.app.activitythread$h.handlemessage(activitythread.java:1234) 04-04 23:16:21.095: e/androidruntime(2737): @ android.os.handler.dispatchmessage(handler.java:99) 04-04 23:16:21.095: e/androidruntime(2737): @ android.os.looper.loop(looper.java:137) 04-04 23:16:21.095: e/androidruntime(2737): @ android.app.activitythread.main(activitythread.java:5041) 04-04 23:16:21.095: e/androidruntime(2737): @ java.lang.reflect.method.invokenative(native method) 04-04 23:16:21.095: e/androidruntime(2737): @ java.lang.reflect.method.invoke(method.java:511) 04-04 23:16:21.095: e/androidruntime(2737): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 04-04 23:16:21.095: e/androidruntime(2737): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 04-04 23:16:21.095: e/androidruntime(2737): @ dalvik.system.nativestart.main(native method) 04-04 23:16:21.095: e/androidruntime(2737): caused by: java.lang.nullpointerexception 04-04 23:16:21.095: e/androidruntime(2737): @ edu.virginia.hotncolduva.mainactivity.initialize(mainactivity.java:27) 04-04 23:16:21.095: e/androidruntime(2737): @ edu.virginia.hotncolduva.mainactivity.oncreate(mainactivity.java:20) 04-04 23:16:21.095: e/androidruntime(2737): @ android.app.activity.performcreate(activity.java:5104) 04-04 23:16:21.095: e/androidruntime(2737): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1080) 04-04 23:16:21.095: e/androidruntime(2737): @ android.app.activitythread.performlaunchactivity(activitythread.java:2144) 04-04 23:16:21.095: e/androidruntime(2737): ... 11 more 04-04 23:20:05.727: e/androidruntime(2833): fatal exception: main 04-04 23:20:05.727: e/androidruntime(2833): java.lang.runtimeexception: unable start activity componentinfo{edu.virginia.hotncolduva/edu.virginia.hotncolduva.mainactivity}: java.lang.nullpointerexception 04-04 23:20:05.727: e/androidruntime(2833): @ android.app.activitythread.performlaunchactivity(activitythread.java:2180) 04-04 23:20:05.727: e/androidruntime(2833): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2230) 04-04 23:20:05.727: e/androidruntime(2833): @ android.app.activitythread.access$600(activitythread.java:141) 04-04 23:20:05.727: e/androidruntime(2833): @ android.app.activitythread$h.handlemessage(activitythread.java:1234) 04-04 23:20:05.727: e/androidruntime(2833): @ android.os.handler.dispatchmessage(handler.java:99) 04-04 23:20:05.727: e/androidruntime(2833): @ android.os.looper.loop(looper.java:137) 04-04 23:20:05.727: e/androidruntime(2833): @ android.app.activitythread.main(activitythread.java:5041) 04-04 23:20:05.727: e/androidruntime(2833): @ java.lang.reflect.method.invokenative(native method) 04-04 23:20:05.727: e/androidruntime(2833): @ java.lang.reflect.method.invoke(method.java:511) 04-04 23:20:05.727: e/androidruntime(2833): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 04-04 23:20:05.727: e/androidruntime(2833): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 04-04 23:20:05.727: e/androidruntime(2833): @ dalvik.system.nativestart.main(native method) 04-04 23:20:05.727: e/androidruntime(2833): caused by: java.lang.nullpointerexception 04-04 23:20:05.727: e/androidruntime(2833): @ edu.virginia.hotncolduva.mainactivity.initialize(mainactivity.java:27) 04-04 23:20:05.727: e/androidruntime(2833): @ edu.virginia.hotncolduva.mainactivity.oncreate(mainactivity.java:20) 04-04 23:20:05.727: e/androidruntime(2833): @ android.app.activity.performcreate(activity.java:5104) 04-04 23:20:05.727: e/androidruntime(2833): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1080) 04-04 23:20:05.727: e/androidruntime(2833): @ android.app.activitythread.performlaunchactivity(activitythread.java:2144) 04-04 23:20:05.727: e/androidruntime(2833): ... 11 more
you should consider different approach instead of sleeping in main thread. why not use handler based on 1s timer , send message ui thread change splash screen (alpha or something) , and once time has elapsed send message load next content view using fade in animation.
as npe, ensure view linked layout file r.layout.splash.
after looking @ code, you're not assigning splash object actual view layout. assign so:
splash = (imageview)findviewbyid(r.id.youridhere);
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