java - Issues re-starting a finish()ed android activity -

i have 2 android activities 1 single button on both.

the activity detailsactivity main activity.

public class detailsactivity extends activity {      @override     public void oncreate(bundle bundle) {          super.oncreate(bundle);         setcontentview(r.layout.details_activity_layout);     }      @override     public void onresume() {          super.onresume();     }        public void gotosubdetails(view view) {          intent intent = new intent(this, subdetailsactivity.class);         startactivity(intent);         finish();     } }  

and subdetailsactivity follows:

public class subdetailsactivity extends activity {      @override     public void oncreate(bundle bundle) {          super.oncreate(bundle);         setcontentview(r.layout.sub_details_activity_layout);     }      @override     public void onresume() {          super.onresume();     }        public void gotodetails(view view) {          intent intent = new intent(this, detailsactivity.class);          startactivity(intent); // restarting finish()ed activity here.         finish();     } }  

and how mentioned button in details_activity_layout.xml detailsactivity.java:

    <button android:id="@+id/details_submit"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:text="@string/to_sub_details"         android:onclick="gotosubdetails" />     

and how have mentioned button in sub_details_activity_layout.xml subdetailsactivity.java:

    <button android:id="@+id/sub_details_submit"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:text="@string/back_to_details"         android:onclick="gotodetails" />     

these both activities in androidmanifest.xml:

    <activity android:name="detailsactivity">         <intent-filter>             <action android:name="android.intent.action.main" />             <category android:name="android.intent.category.launcher" />         </intent-filter>     </activity>      <activity android:name="subdetailsactivity">     </activity> 

when click button in detailsactivity, activity finish()es , subdetailsactivity starts up.

but when click button in subdetailsactivity finish()ed detailsactivity, app straight away crashes on lg l90 phone.

where going wrong? help? please.

ps: cannot post log cat report did not test on mac directly on phone. don't have emulator. compiling code on terminal , transferring .apk file on phone via bluetooth.

edit: ok guys. funny!

i removed

android:onclick="gotosubdetails"   

and

android:onclick="gotodetails"   

from details_activity_layout.xml , sub_details_activity_layout.xml respectively. , loaded android.widget.button's in detailsactivity.java , subdetailsactivity.java , added android.view.view.onclicklistener on both of them , overrode onclick(view) method.

this did in detailsactivity.java:

public class detailsactivity extends activity {      @override     public void oncreate(bundle bundle) {          super.oncreate(bundle);         setcontentview(r.layout.details_activity_layout);          button button = (button)findviewbyid(r.id.details_submit);         button.setonclicklistener(new detailssubmitlistener());     }      @override     public void onresume() {          super.onresume();     }       public class detailssubmitlistener implements onclicklistener {          @override         public void onclick(view view) {              intent intent = new intent(this, subdetailsactivity.class);             startactivity(intent);             finish();         }     } }   

and did in subdetailsactivity.java class:

public class subdetailsactivity extends activity {      @override     public void oncreate(bundle bundle) {          super.oncreate(bundle);         setcontentview(r.layout.details_activity_layout);          button button = (button)findviewbyid(r.id.sub_details_submit);         button.setonclicklistener(new subdetailssubmitlistener());     }      @override     public void onresume() {          super.onresume();     }       public class subdetailssubmitlistener implements onclicklistener {          @override         public void onclick(view view) {              intent intent = new intent(this, detailsactivity.class);             startactivity(intent);             finish();         }     } }   

and miraculously worked fine.

so problem .xml attributes in layout files? , how different hardcoded listener in .java file? thing has confused me. finish()ed activities can re-started. thats discovered change in program. please shed light of knowledge on this.

aditya,

if want traverse between 2 activities in case, should never finish details activity. instead without finishing details activity, start subdetails activity. if want come back, no coding required. if user presses button, subdetails activity finished , detailsactivity come foreground.

finishing 1 activity , starting again, unnecessary overhead. avoid it. finish activity if absolutely necessary.

also, there no way restart finished activity.