Andorid Multithreading Handler Usage

. xml

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns: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"Tools:context= "Com.hanqi.application3.UIActivity7"android:orientation= "vertical">    <AutocompletetextviewAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:hint= "AutoComplete text edit box"Android:id= "@+id/actv_1"Android:completionthreshold= "1"/>    <!--Completionthreshold hints for required characters -    <SpinnerAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:id= "@+id/sp_1">    </Spinner>    <ButtonAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:text= "status bar Prompt"Android:onclick= "Notification_onclick"/>    <ImageViewAndroid:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"android:src= "@drawable/da2"Android:id= "@+id/iv_3"/></LinearLayout>

. java

 PackageCom.hanqi.application3;Importandroid.app.Notification;ImportAndroid.app.NotificationManager;Importandroid.app.PendingIntent;Importandroid.content.Intent;ImportAndroid.os.Handler;ImportAndroid.os.Message;Importandroid.support.v7.app.AppCompatActivity;ImportAndroid.os.Bundle;ImportAndroid.view.View;ImportAndroid.widget.AdapterView;ImportAndroid.widget.ArrayAdapter;ImportAndroid.widget.AutoCompleteTextView;ImportAndroid.widget.ImageView;ImportAndroid.widget.Spinner;ImportAndroid.widget.Toast;ImportJava.util.Timer;ImportJava.util.TimerTask; Public classUIActivity7extendsappcompatactivity {@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.LAYOUT.ACTIVITY_UI7); Autocompletetextview actv_1=(Autocompletetextview) Findviewbyid (r.id.actv_1); //set up an auto-complete data sourcestring[] Strings= {' China ', ' child ', ' Chile ', ' Chinese ', ' Add ', ' All ', ' Class ', ' DDP '}; Arrayadapter<String> Arrayadapter =NewArrayadapter<string> ( This, r.layout.layout_array,strings);        Actv_1.setadapter (Arrayadapter); //Drop- down listString[] strings1 = {' China ', ' child ', ' Chile ', ' Chinese ', ' Add ', ' All ', ' Class ', ' DDP '}; Arrayadapter<String> ArrayAdapter1 =NewArrayadapter<string> ( This, R.LAYOUT.LAYOUT_ARRAY,STRINGS1); Spinner SP1=(Spinner) Findviewbyid (r.id.sp_1);        Sp1.setadapter (ArrayAdapter1); Sp1.setonitemselectedlistener (NewAdapterview.onitemselectedlistener () {@Override Public voidOnitemselected (adapterview<?> Parent, view view,intPositionLongID) {toast.maketext (UIActivity7. This, "position =" +position, Toast.length_short). Show (); } @Override Public voidOnnothingselected (adapterview<?>parent) {Toast.maketext (UIActivity7). This, "No choice", Toast.length_short). Show ();        }        }); //Handler        FinalImageView Iv3 =(ImageView) Findviewbyid (r.id.iv_3); Final int[] Iimageid ={R.DRAWABLE.DA1,R.DRAWABLE.DA2,R.DRAWABLE.DA3,R.DRAWABLE.DA4}; //Inherit Handler        FinalHandler Handler =NewHandler () {inti = 0; //callback method for handling messages//rewrite@Override Public voidhandlemessage (Message msg) {Super. Handlemessage (msg); //determine the category of a message                if(Msg.what ==1)                {                    //Toggle PictureIv3.setimageresource (iimageid[i++%iimageid.length]);//i++;//if (i==10)//                    {//i=0;//                    }                }            }        }; //send a message on a new thread//Fixed loop send//Timer: Start a new thread, execute code at timed time        NewTimer (). Schedule (NewTimerTask () {@Override Public voidrun () {//Send Message//Empty MessageHandler.sendemptymessage (1); }        },1000,2000); }     Public voidNotification_onclick (View v) {//1. Get status Bar message managerNotificationmanager nm =(Notificationmanager) Getsystemservice (Notification_service); //3. Build IntentionsIntent Intent =NewIntent ( This, UIActivity2.class); //4. Get PendingintentPendingintent pendingintent = pendingintent.getactivity ( This, 0,intent,0); //2. Build a message method chain callNotification NT =NewNotification.builder ( This). Setcontenttitle ("This is a notice"). Setcontenttext ("This is the notification content: Click to open the new interface"). Setticker ("New Notice"). Setsmallicon (R.DRAWABLE.DA1)//Image. Setautocancel (true). SetDefaults (Notification.default_all)//Sound. Setcontentintent (pendingintent). build (); //give the manager a messageNm.notify (0, NT); }}

Andorid Multithreading Handler Usage