Android Combat Simple tutorial-60th gun (share a city Select function module)

In doing some of the app may use the function of the city selection module, this example can provide location self-positioning and manual selection of functions, very useful, you can modify and then join their own projects.

First look at the effect:

1. Access to some phones may prompt permission requirements, then we choose to allow.

2. Select Allow to enter:

This location can see that our city has been acquired by GPS

Click on this control and the city gets completed:

Let's take a look at how the key code is performing this function.

1.mainactivity.java:

Package Com.winxiang.locationselect;import Android.app.activity;import Android.content.intent;import Android.os.bundle;import Android.view.view;import Android.widget.textview;public class MainActivity extends Activity {private TextView city_name; @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); Setcontentview (r.layout.activity_main); city_name = (TextView) Findviewbyid (R.id.city_name);} public void Goselcet (View v) {startactivityforresult (new Intent (Mainactivity.this,activityselectcity.class), 99);} @Overrideprotected void Onactivityresult (int requestcode, int resultcode, Intent data) {//TODO auto-generated method stub Try{switch (ResultCode) {case 99:city_name.settext (Data.getstringextra ("Lngcityname")); break;default:break;}} catch (Exception e) {e.printstacktrace ();} Super.onactivityresult (Requestcode, ResultCode, data);}}

Very simple, there is a jump button.

2.activityselectcity.java:

Package Com.winxiang.locationselect;import Java.util.arraylist;import Java.util.collections;import Java.util.comparator;import Java.util.hashmap;import Java.util.list;import Java.util.regex.pattern;import Org.json.jsonarray;import Org.json.jsonobject;import Com.baidu.location.bdlocation;import Com.baidu.location.bdlocationlistener;import Com.baidu.location.locationclient;import Com.baidu.location.locationclientoption;import Android.app.activity;import Android.app.progressdialog;import Android.content.context;import Android.content.intent;import Android.graphics.pixelformat;import Android.os.bundle;import Android.os.handler;import Android.text.editable;import Android.text.TextWatcher;import Android.view.layoutinflater;import Android.view.view;import Android.view.view.onclicklistener;import Android.view.viewgroup;import Android.view.viewgroup.layoutparams;import Android.view.windowmanager;import Android.widget.adapterview;import Android.widget.adapterview.onitemclicklistener;import AndroId.widget.baseadapter;import Android.widget.edittext;import Android.widget.imageview;import Android.widget.linearlayout;import Android.widget.listview;import Android.widget.textview;import Com.winxiang.locationselect.myletterlistview.ontouchingletterchangedlistener;public class ActivitySelectCity Extends Activity{private listadapter adapter;private ListView personlist;private ImageView imgback;private TextView Overlay dialog box initials textviewprivate Myletterlistview Letterlistview; A-Z listviewprivate hashmap<string, integer> alphaindexer;//Store existing initials and corresponding list location private string[] Sections ;//Store The presence of the first letter of the private Handler handler;private overlaythread overlaythread; Display the first letter dialog private arraylist<city> allcity_lists; List of all cities private arraylist<city> showcity_lists; List of cities to display-change private arraylist<city> city_lists;//City list with search private String lngcityname = "";//store returned city name private Jsonarray chinesecities;p rivate locationclient locationclient = null;private EditText sh;privateTextView lng_city;private linearlayout lng_city_lay;private progressdialog progress;private static final int SHOWDIALOG = 2;private static final int dismissdialog = 3; @Overridepublic void OnCreate (Bundle savedinstancestate) {super.oncreate (s Avedinstancestate); Setcontentview (r.layout.activity_selectcity);p ersonlist = (ListView) Findviewbyid (R.id.list_ view); allcity_lists = new arraylist<city> (); Letterlistview = (Myletterlistview) Findviewbyid ( R.ID.MYLETTERLISTVIEW01) Lng_city_lay = (linearlayout) Findviewbyid (r.id.lng_city_lay); sh = (EditText) findViewById ( r.id.sh); lng_city = (TextView) Findviewbyid (r.id.lng_city); imgback = (ImageView) Findviewbyid (r.id.imgback); Letterlistview.setontouchingletterchangedlistener (New Letterlistviewlistener ()); alphaindexer = new HashMap< String, Integer> (), Handler = new Handler (), Overlaythread = new Overlaythread ();p Ersonlist.setonitemclicklistener ( New Onitemclicklistener () {@Overridepublic void Onitemclick (adapterview<?> arg0, View arg1, INT Arg2,long arg3) {Intent Intent = new Intent (); Intent.putextra ("Lngcityname", Showcity_lists.get (arg2). Name); Setresult (99,intent); Finish ();}); Lng_city_lay.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {Intent Intent = new Intent ( ); Intent.putextra ("Lngcityname", Lngcityname); Setresult (99,intent); Finish ();}); Imgback.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {finish ();}}); Initgps (); Initoverlay (); Handler2.sendemptymessage (SHOWDIALOG); Thread thread = new Thread () {@Overridepublic void run () {hotcityinit (); Handler2.sendemptymessage (DismissDialog); Super.run ();}}; Thread.Start ();}   /** * Popular cities */public void Hotcityinit ()  City = new City ("Shanghai", "" "), Allcity_lists.add (city), city = new City (" Beijing "," ""), Allcity_lists.add (city), city = new City ("Guangzhou", "Allcity_lists.add"); city = new City ("Shenzhen", "" "); Allcity_lists.add (city): City = new City (" Wuhan "," "); allcity_ Lists.add (city): City = new City ("Tianjin", "" "); allcity_lists.add (CITCity = new City ("Xian", "" "), Allcity_lists.add (city), city = new City (" Nanjing "," ""), Allcity_lists.add (city) and city = new City ("Hang State "," ""), Allcity_lists.add (city), city = new City ("Chengdu", "" "), Allcity_lists.add (city), city = new City (" Chongqing "," "); allcity_ Lists.add (city); city_lists = Getcitylist (); Allcity_lists.addall (city_lists); Showcity_lists=allcity_lists;} /** * * Get city list via JSON data * @author Yayun * @since September 18, 2015 * @return */private arraylist<city> getcitylist () {Arrayl ist<city> list = new arraylist<city> (); try {chinesecities = new Jsonarray (Getresources (). GetString ( R.string.citys)); for (int i=0;i<chinesecities.length (); i++) {Jsonobject jsonobject = Chinesecities.getjsonobject ( i); City City = new City (jsonobject.getstring ("name"), jsonobject.getstring ("pinyin")); List.add (city);}} catch (Exception e) {e.printstacktrace ();} Collections.sort (list, comparator); return list;} /** * A-Z sort */comparator Comparator = new comparator<city> () {@Overridepublic int compare (city LHS, city RHS){String a = Lhs.getpinyi (). substring (0, 1); String B = Rhs.getpinyi (). substring (0, 1), int flag = A.compareto (b), if (flag = = 0) {return A.compareto (b);} else {return F lag;}}};/ * * Adapter * of ListView * @author Yayun * @since September 18, 2015 * */public class ListAdapter extends Baseadapter {private Layout Inflater inflater;final int view_type = 3;public ListAdapter (context context) {This.inflater = Layoutinflater.from (  context); alphaindexer = new hashmap<string, integer> (); sections = new String[showcity_lists.size ()];for (int i = 0; I < showcity_lists.size (); i++) {//Current first letter String currentstr = Getalpha (Showcity_lists.get (i). Getpinyi ());//previous Hanyu Pinyin if not present as "" string Previewstr = (i-1) >= 0? Getalpha (Showcity_lists.get (i-1). Getpinyi ()): ""; if (!previewstr.equals (CURRENTSTR)) {String name = Getalpha ( Showcity_lists.get (i). Getpinyi ()); Alphaindexer.put (name, i); sections[i] = name;}} @Overridepublic int GetCount () {return showcity_lists.size ();} @Overridepublic Object getItem (int position) {return showcity_lists.get (position);} @Overridepublic long Getitemid (int position) {return position;} @Overridepublic int Getitemviewtype (int position) {//TODO auto-generated method Stubint type = 2;if (position = = 0&AMP;&A Mp;sh.gettext (). Length () ==0) {//Not in the search state type = 0;} return type;} @Overridepublic int Getviewtypecount () {//Here need to return the subscript that requires a centralized layout type, the total size of the seed number of the type, return view_type;} @Overridepublic view GetView (int position, view Convertview, ViewGroup parent) {Viewholder Holder;int ViewType = Getitemvi Ewtype (position); if (Convertview = = null) {Convertview = inflater.inflate (R.layout.list_item, null); holder = new Viewholder (); holder.alpha = (TextView) Convertview.findviewbyid (r.id.alpha); holder.name = (TextView) Convertview.findviewbyid (R.id.name); Convertview.settag (holder);} else {holder = (Viewholder) Convertview.gettag ();} if (Sh.gettext (). Length () ==0) {//Search state//holder.name.settext (list.get (position). GetName ());// Holder.alpha.setVisibility (view.gone);//}else if (position>0) {//show Pinyin and popular cities, check the pinyin of this pinyin and the previous word one time, if the same does not show, if not the same show Holder.name.setText (Showcity_lists.get (position). GetName ()); String currentstr = Getalpha (showcity_lists.get (position). Getpinyi ());//This time pinyin string previewstr = (position-1) >= 0? Getalpha (Showcity_lists.get (position-1). Getpinyi ()): "";//previous Pinyin if (!previewstr.equals (CURRENTSTR)) {// Different displays holder.alpha.setVisibility (view.visible), if (Currentstr.equals ("#")) {currentstr = "hot City";} Holder.alpha.setText (CURRENTSTR);} else {holder.alpha.setVisibility (view.gone);} }return Convertview;} Private class Viewholder {TextView alpha;//first-letter title TextView name;//city name}}//initial initials popup box private void Initoverlay () {La Youtinflater Inflater = Layoutinflater.from (this); overlay = (TextView) inflater.inflate (r.layout.overlay, null); O Verlay.setvisibility (view.invisible); Windowmanager.layoutparams LP = new Windowmanager.layoutparams (layoutparams.wrap_content, LayoutParams.WRAP_CONTENT , windowmanager.layoutparams.type_application,windowmanager.layoutparams.flag_not_focusable| WinDowmanager.layoutparams.flag_not_touchable,pixelformat.translucent); WindowManager WindowManager = (windowmanager) this.getsystemservice (Context.window_service); WindowManager.addView ( overlay, LP);} Private class Letterlistviewlistener Implementsontouchingletterchangedlistener {@Overridepublic void Ontouchingletterchanged (final String s) {if (Alphaindexer.get (s)! = null) {int position = Alphaindexer.get (s);p ersonlist . setselection (position); Overlay.settext (Sections[position]); overlay.setvisibility (view.visible); Handler.removecallbacks (Overlaythread);//delay one second after execution, let overlay be invisible handler.postdelayed (Overlaythread, 1500);}} Set overlay invisible Private class Overlaythread implements Runnable {@Overridepublic void run () {overlay.setvisibility ( View.gone);}} Gets the initials private string Getalpha (String str) {if (Str.equals ("-")) {return "&";} if (str = = null) {return "#";} if (Str.trim (). Length () = = 0) {return "#";} char C = Str.trim (). substring (0, 1). charAt (0);//Regular expression to determine if the first letter is the English letter pattern = pattern.cOmpile ("^[a-za-z]+$"), if (Pattern.matcher (C + "). Matches ()) {return (C +" "). toUpperCase (); else {return ' # ';}} /** * * Initialize GPS * @author Yayun * @since September 18, 2015 */private void Initgps () {Try{mylocationlistenner MyListener = new MyL Ocationlistenner (); locationclient = new Locationclient (activityselectcity.this); Locationclient.registerlocationlistener (MyListener); locationclientoption option = new Locationclientoption (); Option.setopengps (true); Option.setaddrtype ("All"); O Ption.setcoortype ("Bd09ll"); Option.setscanspan (n); Option.disablecache (true); Option.setpoinumber (5); Option.setpoidistance (1000); Option.setpoiextrainfo (TRUE); Option.setpriority (Locationclientoption.gpsfirst); locationclient.setlocoption (option); Locationclient.start ();} catch (Exception e) {e.printstacktrace ();}} /** * Destroy */@Overridepublic void OnDestroy () {Super.ondestroy (); Locationclient.stop ();} /** * Get your current city via the Location SDK * @author Yayun * @since September 18, 2015 * */private class Mylocationlistenner implements Bdlocationliste Ner {@Overridepublic void onreceivelocation (bdlocation location) {if (location = = null) return; StringBuffer sb = new StringBuffer, if (location.getloctype () = = bdlocation.typegpslocation) {sb.append ( Location.getcity ());} else if (location.getloctype () = = bdlocation.typenetworklocation) {sb.append (location.getcity ());} if (sb.tostring () = null && sb.tostring (). Length () > 0) {lngcityname=sb.tostring (); Lng_city.settext ( lngcityname);}} public void Onreceivepoi (Bdlocation poilocation) {}}handler handler2 = new Handler () {public void Handlemessage ( Android.os.Message msg) {switch (msg.what) {Case showdialog:progress = apputil.showprogress (Activityselectcity.this, " Loading data, please wait ... "); Break;case dismissdialog:if (progress! = null) {Progress.dismiss ();} adapter = new ListAdapter (activityselectcity.this);p Ersonlist.setadapter (adapter);//personlist.setadapter (Adapter ); Sh.addtextchangedlistener (new Textwatcher () {@Overridepublic void ontextchanged (charsequence s, int start, int before , int CoUNT) {} @Overridepublic void beforetextchanged (charsequence s, int start, int count,int after) {} @Overridepublic void after TextChanged (Editable s) {//search for city names that match user input if (s.length () >0) {arraylist<city> changecity = new arraylist<city > (); for (int i=0;i<city_lists.size (); i++) {if (City_lists.get (i). Name.indexof (Sh.gettext (). toString ())!=-1) { Changecity.add (City_lists.get (i));}} showcity_lists = changecity;} else{showcity_lists = allcity_lists;} Adapter.notifydatasetchanged ();}}); Break;default:break;}};};}

3. Custom controls (Quick indexing):

Package Com.winxiang.locationselect;import Android.content.context;import Android.graphics.canvas;import Android.graphics.color;import Android.graphics.paint;import Android.graphics.typeface;import Android.text.style.typefacespan;import Android.util.attributeset;import Android.view.motionevent;import Android.view.view;public class Myletterlistview extends View {Ontouchingletterchangedlistener Ontouchingletterchangedlistener; String[] B = {"#", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U" , "V", "W", "X", "Y", "Z"};int choose =-1; Paint paint = new paint (); Boolean showbkg = False;public Myletterlistview (context context, AttributeSet attrs, int defstyl e) {Super (context, attrs, Defstyle);} Public Myletterlistview (context context, AttributeSet Attrs) {Super (context, attrs);} Public Myletterlistview (Context context) {super (context);} @Overrideprotected void OnDraw (canvas canvas) {Super.ondraw (canvas), if (showbkg) {Canvas.drawcolor (Color.Parsecolor ("#10000000"));}  int height = getheight (); int width = getwidth (); int singleheight = height/b.length;for (int i = 0; i < b.length; i++) {Paint.setcolor (Color.parsecolor ("#515151"));p Aint.settypeface (typeface.default_bold);p Aint.setantialias (True) if (i = = choose) {Paint.setcolor (Color.parsecolor ("#3399ff"));p Aint.setfakeboldtext (true);} float XPos = width/2-Paint.measuretext (B[i])/2;float YPos = singleheight * i + singleheight;canvas.drawtext (b[i], XP OS, YPos, paint);p aint.reset ();}} @Overridepublic boolean dispatchtouchevent (Motionevent event) {Final int action = Event.getaction (); final float y = event. GetY (); final int oldchoose = choose;final Ontouchingletterchangedlistener listener = Ontouchingletterchangedlistener; Final int c = (int) (Y/getheight () * b.length); switch (action) {Case MotionEvent.ACTION_DOWN:showBkg = true;if (oldchoos E! = c && Listener! = null) {if (c >= 0 && C <= b.length) {listener.ontouchingletterchanged (b[c]); CH Oose = C;inValidate ();}} Break;case MotionEvent.ACTION_MOVE:if (Oldchoose! = c && Listener! = null) {if (c >= 0 && C <= b.len gth) {listener.ontouchingletterchanged (b[c]); choose = C;invalidate ();}} Break;case MotionEvent.ACTION_UP:showBkg = False;choose = -1;invalidate (); break;} return true;} @Overridepublic boolean ontouchevent (Motionevent event) {return super.ontouchevent (event);} public void Setontouchingletterchangedlistener (Ontouchingletterchangedlistener ontouchingletterchangedlistener) { This.ontouchingletterchangedlistener = Ontouchingletterchangedlistener;} Public interface Ontouchingletterchangedlistener {public void ontouchingletterchanged (String s);}

Run the effect:

In the space problem, other code you can download Source view:

SOURCE download

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Android Combat Simple tutorial-60th gun (share a city Select function module)