Android Course---Learning about service (running in the background)

Mainactivity.java

 PackageCom.hanqi.test2;ImportAndroid.content.ComponentName;ImportAndroid.content.Context;Importandroid.content.Intent;Importandroid.content.ServiceConnection;ImportAndroid.os.IBinder;Importandroid.support.v7.app.AppCompatActivity;ImportAndroid.os.Bundle;ImportAndroid.util.Log;ImportAndroid.view.View;ImportAndroid.widget.Toast; Public classMainactivityextendsappcompatactivity {protected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);    Setcontentview (R.layout.activity_main); }    //General way to start service//refer to how activity is started     Public voidBt1_onclick (View v) {//Through Intent Intent//an explicit intentIntent Intent =NewIntent ( This, TestService1.class);        StartService (Intent); Toast.maketext (mainactivity. This, "Start Service", Toast.length_short). Show (); }     Public voidBt2_onclick (View v) {//Through Intent Intent//an explicit intentIntent Intent =NewIntent ( This, TestService1.class);        StopService (Intent); Toast.maketext (mainactivity. This, "Stop Service", Toast.length_short). Show ();    } serviceconnection SC;  Public voidBt3_onclick (View v) {//Through Intent Intent//an explicit intentIntent Intent =NewIntent ( This, TestService1.class); if(sc = =NULL) {SC=Newserviceconnection () {@Override Public voidonserviceconnected (componentname name, IBinder service) {LOG.E ("TAG", "Connection service"); } @Override Public voidonservicedisconnected (componentname name) {LOG.E ("TAG", "Disconnect service");        }            }; }        //Parameters: Intent, connection, bind mode bind_auto_create: Auto CreateBindservice (INTENT,SC, context.bind_auto_create); Toast.maketext (mainactivity. This, "Bind service succeeded", Toast.length_short). Show (); }     Public voidBt4_onclick (View v) {//determines whether the connection is empty, if it is already bound        if(SC! =NULL)        {            //UnbindUnbindservice (SC); SC=NULL; Toast.maketext (mainactivity. This, "Unbind", Toast.length_short). Show (); }        Else{toast.maketext (mainactivity). This, "not yet bound", Toast.length_short). Show (); }} @Overrideprotected voidOnDestroy () {if(SC! =NULL) {            //UnbindUnbindservice (SC); SC=NULL; }        Super. OnDestroy (); }}

Testservice1.java

 PackageCom.hanqi.test2;ImportAndroid.app.Service;Importandroid.content.Intent;ImportAndroid.os.Binder;ImportAndroid.os.IBinder;ImportAndroid.util.Log; Public classTestService1extendsService { PublicTestService1 () {LOG.E ("TAG", "Construct service"); }    //callback method for binding//you have to override@Override Publicibinder onbind (Intent Intent) {//Todo:return The communication channel to the service. //throw new Unsupportedoperationexception ("not yet implemented");LOG.E ("TAG", "Bind is called"); return NewBinder (); } @Override Public voidonCreate () {LOG.E ("TAG", "Create service"); Super. OnCreate (); } @Override Public voidOnDestroy () {LOG.E ("TAG", "Destroy service"); Super. OnDestroy (); } @Override Public intOnstartcommand (Intent Intent,intFlagsintStartid) {LOG.E ("TAG", "Start command"); return Super. Onstartcommand (Intent, flags, Startid); } @Override Public BooleanOnunbind (Intent Intent) {LOG.E ("TAG", "Unbind"); return Super. Onunbind (Intent); }}

Activity_main.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.test2.MainActivity"android:orientation= "vertical">    <LinearLayoutAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content">        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:layout_weight= "1"Android:text= "General start service"Android:onclick= "Bt1_onclick"/>        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:layout_weight= "1"Android:text= "General Stop Service"Android:onclick= "Bt2_onclick"/>    </LinearLayout>    <LinearLayoutAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content">        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:layout_weight= "1"Android:text= "bind start service"Android:onclick= "Bt3_onclick"/>        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:layout_weight= "1"Android:text= "Unbind stop service"Android:onclick= "Bt4_onclick"/>    </LinearLayout></LinearLayout>

：

Android Course---Learning about service (running in the background)