How to create a custom view that is initialize only once and common for all activity in Android? -
i trying create custom view in android. following condition :
- the view should initialize once
- the same view should used throughout application
i have tried initialize view application class , adding current activity.
following code :
viewinappapplcation
public class viewinappapplcation extends application { @override public void oncreate() { super.oncreate(); registeractivitylifecyclecallbacks(new appactivitycallback()); } private class appactivitycallback implements activitylifecyclecallbacks { statusbarview statusbarview = null; @override public void onactivitycreated(activity activity, bundle bundle) { final activity activity1 = activity; activity.runonuithread(new runnable() { @override public void run() { if (statusbarview == null) { statusbarview = new statusbarview(activity1); } } }); } @override public void onactivitystarted(activity activity) { } @override public void onactivityresumed(activity activity) { linearlayout view = (linearlayout) activity.findviewbyid(r.id.status_bar_view_holder); if (view != null) { view.addview(statusbarview, 0); } } @override public void onactivitypaused(activity activity) { linearlayout view = (linearlayout) activity.findviewbyid(r.id.status_bar_view_holder); if (view != null) { view.removeview(statusbarview); } } @override public void onactivitystopped(activity activity) { } @override public void onactivitysaveinstancestate(activity activity, bundle bundle) { } @override public void onactivitydestroyed(activity activity) { } } } statusbarview
public class statusbarview extends relativelayout{ /**activity context object.*/ private context context = null; /** view object */ private statusbarview statusbarview = null; /** * constructor * * @param context - context reference * */ public statusbarview(context context) { super(context); this.context = context; this.statusbarview = this; initview(); } /** * constructor * * @param context - context reference * @param attrs - set of attributes */ public statusbarview(context context, attributeset attrs) { super(context, attrs); this.context = context; this.statusbarview = this; initview(); } /** * constructor * * @param context - context reference * @param attrs - attribute list * @param defstyleattr - default style attributes */ public statusbarview(context context, attributeset attrs, int defstyleattr) { super(context, attrs, defstyleattr); this.context = context; this.statusbarview = this; initview(); } /** * inflate app status bar xml , add view */ private void initview() { layoutinflater inflater = layoutinflater.from(context); view view = inflater.inflate(r.layout.view_app_status_bar, this, false); new asy().execute(); statusbarview.addview(view); } public void setvalue(string value) { textview textview = (textview) findviewbyid(r.id.txt_status); textview.settext(value); } private class asy extends asynctask<void,integer,string> { @override protected string doinbackground(void... params) { (int i=0;i<20;i++) { publishprogress(i); try { thread.sleep(3000); } catch (interruptedexception e) { e.printstacktrace(); } } return "done"; } @override protected void onpostexecute(string result) { super.onpostexecute(result); } @override protected void onprogressupdate(integer... values) { super.onprogressupdate(values); setvalue(values[0]+""); } } } mainactivity
public class mainactivity extends activity { @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); findviewbyid(r.id.next).setonclicklistener(new view.onclicklistener() { @override public void onclick(view v) { intent intent = new intent(mainactivity.this, main2activity.class); startactivity(intent); } }); } } activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" android:orientation="vertical"> <linearlayout android:background="@color/coloraccent" android:id="@+id/status_bar_view_holder" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" /> <button android:id="@+id/next" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="hello world!" /> </linearlayout> this code add statusbar view current activity. there other way it?
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