New dialog activity not starting in Android -
i have activity, starts dialog box when list item long pressed. start activity via code snippet:
private void showwifisettings(int arg2) { intent newintent = new intent("com.example.searchingwifi.dialogactivity"); startactivity(newintent); } and, code in new dialog activity undersigned.
package com.example.searchingwifi; import android.app.alertdialog; import android.app.dialog; import android.content.dialoginterface; import android.os.bundle; import android.support.v4.app.dialogfragment; import android.view.layoutinflater; public class dialogactivity extends dialogfragment{ @override public dialog oncreatedialog(bundle savedinstancestate) { alertdialog.builder builder = new alertdialog.builder(getactivity()); // layout inflater layoutinflater inflater = getactivity().getlayoutinflater(); // inflate , set layout dialog // pass null parent view because going in dialog layout builder.setview(inflater.inflate(r.layout.dialog, null)); return builder.create(); } } on long pressing corresponding list item, logcat gives me following error, , application stops running.
06-27 12:54:22.150: e/androidruntime(25118): fatal exception: main 06-27 12:54:22.150: e/androidruntime(25118): process: com.example.searchingwifi, pid: 25118 06-27 12:54:22.150: e/androidruntime(25118): java.lang.runtimeexception: unable instantiate activity componentinfo{com.example.searchingwifi/com.example.searchingwifi.dialogactivity}: java.lang.classcastexception: com.example.searchingwifi.dialogactivity cannot cast android.app.activity 06-27 12:54:22.150: e/androidruntime(25118): @ android.app.activitythread.performlaunchactivity(activitythread.java:2121) 06-27 12:54:22.150: e/androidruntime(25118): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2245) 06-27 12:54:22.150: e/androidruntime(25118): @ android.app.activitythread.access$800(activitythread.java:135) 06-27 12:54:22.150: e/androidruntime(25118): @ android.app.activitythread$h.handlemessage(activitythread.java:1196) 06-27 12:54:22.150: e/androidruntime(25118): @ android.os.handler.dispatchmessage(handler.java:102) 06-27 12:54:22.150: e/androidruntime(25118): @ android.os.looper.loop(looper.java:136) 06-27 12:54:22.150: e/androidruntime(25118): @ android.app.activitythread.main(activitythread.java:5017) 06-27 12:54:22.150: e/androidruntime(25118): @ java.lang.reflect.method.invokenative(native method) 06-27 12:54:22.150: e/androidruntime(25118): @ java.lang.reflect.method.invoke(method.java:515) 06-27 12:54:22.150: e/androidruntime(25118): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:779) 06-27 12:54:22.150: e/androidruntime(25118): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:595) 06-27 12:54:22.150: e/androidruntime(25118): @ dalvik.system.nativestart.main(native method) 06-27 12:54:22.150: e/androidruntime(25118): caused by: java.lang.classcastexception: com.example.searchingwifi.dialogactivity cannot cast android.app.activity 06-27 12:54:22.150: e/androidruntime(25118): @ android.app.instrumentation.newactivity(instrumentation.java:1061) 06-27 12:54:22.150: e/androidruntime(25118): @ android.app.activitythread.performlaunchactivity(activitythread.java:2112) 06-27 12:54:22.150: e/androidruntime(25118): ... 11 more can me error, , making mistake ?
edit :- if starting new dialog activity, system still giving error. logcat given below.
06-30 03:54:10.550: e/androidruntime(1175): fatal exception: main 06-30 03:54:10.550: e/androidruntime(1175): process: com.example.testingdialog, pid: 1175 06-30 03:54:10.550: e/androidruntime(1175): java.lang.runtimeexception: unable instantiate activity componentinfo{com.example.testingdialog/com.example.testingdialog.mainactivity}: java.lang.classcastexception: com.example.testingdialog.mainactivity cannot cast android.app.activity 06-30 03:54:10.550: e/androidruntime(1175): @ android.app.activitythread.performlaunchactivity(activitythread.java:2121) 06-30 03:54:10.550: e/androidruntime(1175): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2245) 06-30 03:54:10.550: e/androidruntime(1175): @ android.app.activitythread.access$800(activitythread.java:135) 06-30 03:54:10.550: e/androidruntime(1175): @ android.app.activitythread$h.handlemessage(activitythread.java:1196) 06-30 03:54:10.550: e/androidruntime(1175): @ android.os.handler.dispatchmessage(handler.java:102) 06-30 03:54:10.550: e/androidruntime(1175): @ android.os.looper.loop(looper.java:136) 06-30 03:54:10.550: e/androidruntime(1175): @ android.app.activitythread.main(activitythread.java:5017) 06-30 03:54:10.550: e/androidruntime(1175): @ java.lang.reflect.method.invokenative(native method) 06-30 03:54:10.550: e/androidruntime(1175): @ java.lang.reflect.method.invoke(method.java:515) 06-30 03:54:10.550: e/androidruntime(1175): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:779) 06-30 03:54:10.550: e/androidruntime(1175): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:595) 06-30 03:54:10.550: e/androidruntime(1175): @ dalvik.system.nativestart.main(native method) 06-30 03:54:10.550: e/androidruntime(1175): caused by: java.lang.classcastexception: com.example.testingdialog.mainactivity cannot cast android.app.activity 06-30 03:54:10.550: e/androidruntime(1175): @ android.app.instrumentation.newactivity(instrumentation.java:1061) 06-30 03:54:10.550: e/androidruntime(1175): @ android.app.activitythread.performlaunchactivity(activitythread.java:2112) 06-30 03:54:10.550: e/androidruntime(1175): ... 11 more
you trying start activity dialogfragment. either make dialogactivity , start activity this:
intent intent=new intent(getapplicationcontext(), dialogactivity.class); startactivity(intent); or
you can keep dialogragment only, , show dialogfragment instead of starting new activity.
example:
mydialogfragment mydialogfragment = new mydialogfragment(); mydialogfragment.show(fragmanager, "mydialogfragment"); reference links:
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