android--with activity and service for a simple music player

One, only with activity

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.example.chenshuai.myapplication.ActivityMusic"android:orientation= "vertical">    <TextViewAndroid:layout_width= "Match_parent"Android:layout_height= "40SP"Android:text= "Playback status"android:textsize= "20SP"android:gravity= "Center_horizontal"Android:id= "@+id/tv_1"/>    <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= "Play"Android:onclick= "Play_onclick"/>        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:layout_weight= "1"Android:text= "Paused"Android:onclick= "Pause_onclick"/>        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:layout_weight= "1"Android:text= "Stop"Android:onclick= "Stop_onclick"/>        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:layout_weight= "1"Android:text= "Exit"Android:onclick= "Exit_onclick"/>    </LinearLayout></LinearLayout>

Java

 Packagecom.example.chenshuai.myapplication;ImportAndroid.media.MediaPlayer;Importandroid.support.v7.app.AppCompatActivity;ImportAndroid.os.Bundle;ImportAndroid.view.View;ImportAndroid.widget.TextView; Public classActivitymusicextendsappcompatactivity {TextView tv_1; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_activity_music); Tv_1=(TextView) Findviewbyid (r.id.tv_1); Tv_1.settext ("Playback status: Stop playing ... "); }    //Media Player definition member variable    PrivateMediaPlayer MediaPlayer;  Public voidPlay_onclick (view view) {if(MediaPlayer = =NULL) {            //call the static method of MediaPlayer createMediaPlayer = Mediaplayer.create ( This, R.raw.tangren);        } mediaplayer.start (); Tv_1.settext ("Playback Status: Playing ... "); }     Public voidStop_onclick (view view) {if(MediaPlayer! =NULL) {mediaplayer.stop ();//StopMediaplayer.reset ();// ResetMediaplayer.release ();//Freeing ResourcesMediaPlayer =NULL;//re-assignment to null} tv_1.settext ("Playback status: Stop playing ... "); }     Public voidPause_onclick (view view) {if(MediaPlayer! =NULL&&mediaplayer.isplaying ())            {Mediaplayer.pause (); Tv_1.settext ("Playback status: Pause playback ... "); }    }     Public voidExit_onclick (view view) {Stop_onclick (view);    Finish (); }}

Effect:

Second, with service implementation

The same XML

Activitymusicservice.java

 Packagecom.example.chenshuai.myapplication;Importandroid.content.Intent;ImportAndroid.os.Bundle;Importandroid.support.v7.app.AppCompatActivity;ImportAndroid.view.View;ImportAndroid.widget.TextView; Public classActivitymusicserviceextendsappcompatactivity {TextView tv_1; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_activity_music); Tv_1=(TextView) Findviewbyid (r.id.tv_1); Tv_1.settext ("Playback status 11: Stop playback ... "); }     Public voidPlay_onclick (view view) {Intent Intent=NewIntent ( This, Myservicemusic.class); Intent.putextra ("Action", "play");        StartService (Intent); Tv_1.settext ("Playback status 11: Playing ... "); }     Public voidStop_onclick (view view) {Intent Intent=NewIntent ( This, Myservicemusic.class); Intent.putextra ("Action", "Stop");        StartService (Intent); Tv_1.settext ("Playback status 11: Stop playback ... "); }     Public voidPause_onclick (view view) {Intent Intent=NewIntent ( This, Myservicemusic.class); Intent.putextra ("Action", "pause");        StartService (Intent); Tv_1.settext ("Play status 11: Pause playback ... "); }     Public voidExit_onclick (view view) {Stop_onclick (view);    Finish (); }}

Myservicemusic.java

 Packagecom.example.chenshuai.myapplication;ImportAndroid.app.Service;Importandroid.content.Intent;ImportAndroid.media.MediaPlayer;ImportAndroid.os.IBinder; Public classMyservicemusicextendsService { PublicMyservicemusic () {} @Override Publicibinder onbind (Intent Intent) {//Todo:return The communication channel to the service.        Throw NewUnsupportedoperationexception ("not yet implemented"); }    PrivateMediaPlayer MediaPlayer; @Override Public intOnstartcommand (Intent Intent,intFlagsintStartid) {        //get information about intent to passString action = Intent.getstringextra ("Action"); Switch(action) { Case"Play":                if(MediaPlayer = =NULL) {MediaPlayer= Mediaplayer.create ( This, R.raw.onceagain);                } mediaplayer.start ();  Break;  Case"Stop":                if(MediaPlayer! =NULL) {mediaplayer.stop ();                    Mediaplayer.reset ();                    Mediaplayer.release (); MediaPlayer=NULL; }                 Break;  Case"Pause":                if(MediaPlayer! =NULL&&mediaplayer.isplaying ())                {Mediaplayer.pause (); }                 Break; }        return Super. Onstartcommand (Intent, flags, Startid); }}

Effect:

android--with activity and service for a simple music player