Android Boot Background Runtime program (Service)

In Android development, use the service when you need to create a program that runs in the background. Service can be divided into two kinds: infinite life and limited life. It is important to note that the service is different from the activities (it can be understood as the difference between the background and the foreground), for example, if you need to use a service, you need to call StartService () to take advantage of StartService () Go to invoke the OnCreate () and OnStart () methods in the service to start a background service.
The process for starting a Service is as follows: Context.startservice ()->oncreate ()->onstart ()->service running where onCreate () You can do some initialization of the service, and OnStart () starts the service.
The process of stopping a service is as follows: Context.stopservice () | ->ondestroy ()->service stop
The next example is a small example of using a background service to play music, click Start to run the service, and click Stop Service.
Servicesdemo.java (is an activity)

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2. Package com.android.myservice;
6. Import android.app.Activity;
8. Import android.content.Intent;
10. Import Android.os.Bundle;
12. Import Android.util.Log;
14. Import Android.view.View;
16. Import Android.view.View.OnClickListener;
18. Import Android.widget.Button;
22. Public class Servicedemo extends Activity implements Onclicklistener {
24. private static final String TAG = "Servicedemo";
26. Button Buttonstart, Buttonstop;
30. @Override
32. public void OnCreate (Bundle savedinstancestate) {
34. super.oncreate (savedinstancestate);
36. Setcontentview (R.layout.main);
40. Buttonstart = (Button) Findviewbyid (R.id.buttonstart);
42. Buttonstop = (Button) Findviewbyid (r.id.buttonstop);
46. Buttonstart.setonclicklistener (this);
48. Buttonstop.setonclicklistener (this);
50. }
54. public void OnClick (View src) {
56. switch (Src.getid ()) {
58. Case R.id.buttonstart:
60. LOG.I (TAG, "onclick:starting service");
62. StartService (new Intent (This, MyService.   Class));
64. Break ;
66. Case R.id.buttonstop:
68. LOG.I (TAG, "onclick:stopping service");
70. StopService (new Intent (This, MyService.   Class));
72. Break ;
74. }
76. }
78. }

In addition to the manifest inside the statement service: (Androidmanifest.xml)

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2. <? XML version= "1.0" encoding="Utf-8"?>
6. <manifest xmlns:android="http://schemas.android.com/apk/res/android"
8. package="Com.android.myservice">
10. <application android:label="@string/app_name">
12. <activity android:name=". Servicedemo " android:label=" @string/app_name ">
14. <intent-filter>
16. <action android:name="Android.intent.action.MAIN"/>
18. <category android:name="Android.intent.category.LAUNCHER"/>
20. </intent-filter>
22. </Activity>
24. <service android:enabled="true" android:name= ". MyService "/>
26. </Application>
28. </manifest>

Define Service (Myservice.java)

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2. Package com.android.myservice;
6. Import Android.app.Service;
8. Import android.content.Intent;
10. Import Android.media.MediaPlayer;
12. Import Android.os.IBinder;
14. Import Android.util.Log;
16. Import Android.widget.Toast;
20. Public class MyService extends Service {
22. private static final String TAG = "MyService";
24. MediaPlayer player;
28. @Override
30. Public IBinder Onbind (Intent Intent) {
32. return null;
34. }
38. @Override
40. public void OnCreate () {
42. Toast.maketext (This, "My Service created", Toast.length_long). Show ();
44. LOG.I (TAG, "onCreate");
48. Player = Mediaplayer.create (this, R.raw.braincandy);
50. Player.setlooping (false);
52. }
56. @Override
58. public void OnDestroy () {
60. Toast.maketext (This, "My Service stoped", Toast.length_long). Show ();
62. LOG.I (TAG, "OnDestroy");
64. Player.stop ();
66. }
70. @Override
72. public void OnStart (Intent Intent, int startid) {
74. Toast.maketext (This, "My Service Start", Toast.length_long). Show ();
76. LOG.I (TAG, "OnStart");
78. Player.start ();
80. }
82. }

The Layout folder is Main.xml

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2. <? XML version= "1.0" encoding="Utf-8"?>
4. <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
6. android:orientation="vertical"
8. android:layout_width="fill_parent"
10. android:layout_height="fill_parent"
12. android:gravity="center">
14. <TextView
16. android:layout_width="fill_parent"
18.     android:layout_height= "wrap_content"  android:text= "@string/services_demo"  android:gravity= "center"  android:textsize= "20SP"  android:padding= "20DP" />   
20. <button android:layout_width=< Span class= "Attribute-value" > "wrap_content"  android:layout_height=" wrap_content " android:id=" @+id/ Buttonstart " android:text=" @string/start " ></button>  
22. <button android:layout_width= "wrap_content" android:layout_height="Wrap_content "  android:text="@string/stop" android:id="@+id/buttonstop"></Button>
24. </linearlayout>

The Values folder is Strings.xml

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2. <? XML version= "1.0" encoding="Utf-8"?>
6. <resources>
8. <string name="Start">start</string>
10. <string name="Stop">stop</string>
12. <string name="Services_demo">service demo</string>
14. </Resources>

Android Boot Background Runtime program (Service)