什麼是service
沒有UI的程式
，在背景執行的Process。
啟動service的方式：
1. startService()
，stopService()
啟動 onCreate() --> onStart()
結束 onDestory()
若沒有StopService()則會繼續執行下去
2. bindService()
，unbindService()
啟動onCreate() --> onBind()
結束onUnBind() --> onDestory()
啟動已執行起來的service，當然也可以啟動未執行起來的service。
兩種方式可以混用
，但必須stopService()且unbindService()才真正結束service。
demo code
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.wandroid.servicedemo"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".ServiceDemo"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".xxxService" android:exported="true"></service>
<service android:name=".xxxRemoteService" android:process=":remote"/>
<receiver android:name="xxxBroadcastReceiver">
<intent-filter>
<action android:name="com.wandroid.servicedemo.Play_MUSIC"/>
</intent-filter>
</receiver>
</application>
<uses-sdk android:minSdkVersion="7" />
</manifest>
res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:id="@+id/startservice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="startService"
/>
<Button
android:id="@+id/stopservice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="stopService"
/>
<Button
android:id="@+id/bindservice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="bindService"
/>
<Button
android:id="@+id/unbindservice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="unbindService"
/>
<TextView
android:id="@+id/remotetext"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/remotehello"
/>
<Button
android:id="@+id/remotebindservice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="remote bindService"
/>
<Button
android:id="@+id/remoteunbindservice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="remote unbindService"
/>
<Button
android:id="@+id/musicbroadcast"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="music broadcast"
/>
</LinearLayout>
res/raw/music.mp3
res/values/strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, ServiceDemo!</string>
<string name="app_name">ServiceDemo</string>
<string name="remotehello">Hello World,Remote ServiceDemo!</string>
</resources>
ServiceDemo.java
package com.wandroid.servicedemo;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class ServiceDemo extends Activity implements OnClickListener
{
private xxxService mxxxService = null;
private IxxxRemoteService mxxxRemoteService = null;
private TextView mTextView = null;
private TextView mremoteTextView = null;
private Button startServiceButton = null;
private Button stopServiceButton = null;
private Button bindServiceButton = null;
private Button unbindServiceButton = null;
private Context mContext = null;
private Button remotebindServiceButton = null;
private Button remoteunbindServiceButton = null;
private Button musicbroadcastButton = null;
//ServiceConnection在bind時建立連線
private ServiceConnection mServiceConnection = new ServiceConnection()
{
public void onServiceConnected(ComponentName name, IBinder service)
{
if( name.getClassName().compareTo
("com.wandroid.servicedemo.xxxService") == 0 )
{
//===local service
mxxxService = ((xxxService.xxxBinder)service).getService();
try {
mTextView.setText("I am frome Service :"+
Integer.toString(mxxxService.sum(5, 5)));
} catch (RemoteException e) {
e.printStackTrace();
}
}
else
{
//===remote service
mxxxRemoteService = IxxxRemoteService.Stub.asInterface(service);
try {
mremoteTextView.setText("I am frome remote Service :"+
Integer.toString(mxxxRemoteService.sumabc(5, 5, 5)));
} catch (RemoteException e) {
e.printStackTrace();
}
}
}
public void onServiceDisconnected(ComponentName name)
{
if(mxxxService != null)
{
mxxxService = null;
}
else
{
mxxxRemoteService = null;
}
}
};
//activity=======
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mContext = ServiceDemo.this;
mTextView = (TextView)findViewById(R.id.text);
mremoteTextView = (TextView)findViewById(R.id.remotetext);
startServiceButton = (Button)findViewById(R.id.startservice);
stopServiceButton = (Button)findViewById(R.id.stopservice);
bindServiceButton = (Button)findViewById(R.id.bindservice);
unbindServiceButton = (Button)findViewById(R.id.unbindservice);
remotebindServiceButton = (Button)findViewById(R.id.remotebindservice);
remoteunbindServiceButton = (Button)findViewById(R.id.remoteunbindservice);
musicbroadcastButton = (Button)findViewById(R.id.musicbroadcast);
startServiceButton.setOnClickListener(this);
stopServiceButton.setOnClickListener(this);
bindServiceButton.setOnClickListener(this);
unbindServiceButton.setOnClickListener(this);
remotebindServiceButton.setOnClickListener(this);
remoteunbindServiceButton.setOnClickListener(this);
musicbroadcastButton.setOnClickListener(this);
}
public void onClick(View v)
{
if(v == startServiceButton)
{
Intent i = new Intent();
i.setClass(ServiceDemo.this, xxxService.class);
mContext.startService(i);
}
else if(v == stopServiceButton)
{
Intent i = new Intent();
i.setClass(ServiceDemo.this, xxxService.class);
mContext.stopService(i);
}
else if(v == bindServiceButton)
{
Intent i = new Intent();
i.setClass(ServiceDemo.this, xxxService.class);
mContext.bindService(i, mServiceConnection, BIND_AUTO_CREATE);
}
else if(v == unbindServiceButton)
{
if( mServiceConnection != null)
{
mContext.unbindService(mServiceConnection);
}
}
else if(v == remotebindServiceButton)
{
Intent i = new Intent();
i.setClass(ServiceDemo.this, xxxRemoteService.class);
mContext.bindService(i, mServiceConnection, BIND_AUTO_CREATE);
}
else if(v == remoteunbindServiceButton)
{
if( mServiceConnection != null)
{
mContext.unbindService(mServiceConnection);
mremoteTextView.setText("");
}
}
else if(v == musicbroadcastButton)
{
Intent i = new Intent();
i.setAction("com.wandroid.servicedemo.Play_MUSIC");
sendBroadcast(i);
}
}
}
xxxService.java
package com.wandroid.servicedemo;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;
public class xxxService extends Service
{
private static final String TAG = "xxxService";
//bindService()時,建立connection用
public class xxxBinder extends Binder
{
xxxService getService()
{
Log.e(TAG, "===getService()===");
return xxxService.this;
}
}
private xxxBinder mxxxBinder = new xxxBinder();
@Override
public IBinder onBind(Intent intent)
{
Log.e(TAG, "===onBind===");
return mxxxBinder;
}
@Override
public boolean onUnbind(Intent intent)
{
Log.e(TAG, "===onUnbind===");
return super.onUnbind(intent);
}
//===由startService啟動只會用到以下三個
@Override
public void onCreate()
{
Log.e(TAG, "===onCreate===");
super.onCreate();
}
//由bindService啟動,就沒有onStart()
@Override
public void onStart(Intent intent, int startId)
{
Log.e(TAG, "===onStart===");
super.onStart(intent, startId);
}
@Override
public void onDestroy()
{
Log.e(TAG, "===onDestroy===");
super.onDestroy();
}
//service function====
public int sum(int a, int b) throws RemoteException
{
Log.e(TAG, "===sum()===");
return a+b;
}
}
xxxRemoteService.java
package com.wandroid.servicedemo;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;
public class xxxRemoteService extends Service
{
private static final String TAG = "xxxRemoteService";
private MediaPlayer mp = null;
private final IxxxRemoteService.Stub binder= new IxxxRemoteService.Stub()
{
public int sumabc(int a, int b, int c) throws RemoteException
{
Log.e(TAG, "===remote sumabc()===");
mp = MediaPlayer.create(xxxRemoteService.this, R.raw.music);
mp.start();
return a+b+c;
}
};
@Override
public IBinder onBind(Intent arg0)
{
Log.e(TAG, "===remote onBind()===");
return this.binder;
}
@Override
public boolean onUnbind(Intent intent)
{
Log.e(TAG, "===remote onUnbind()===");
mp.stop();
return super.onUnbind(intent);
}
//===由startService啟動只會用到以下三個
@Override
public void onCreate()
{
Log.e(TAG, "===remote onCreate()===");
super.onCreate();
}
//由bindService啟動,就沒有onStart()
@Override
public void onStart(Intent intent, int startId)
{
Log.e(TAG, "===remote onStart()===");
super.onStart(intent, startId);
}
@Override
public void onDestroy()
{
Log.e(TAG, "===remote onDestroy()===");
mp.release();
super.onDestroy();
}
}
IxxxRemoteService.aidl
package com.wandroid.servicedemo;
interface IxxxRemoteService
{
int sumabc(int a, int b,int c);
}
xxxBroadcastReceiver.java
package com.wandroid.servicedemo;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;
public class xxxBroadcastReceiver extends BroadcastReceiver
{
private static final String TAG = "xxxBroadcastReceiver";
private IxxxRemoteService mxxxRemoteService = null;
private ServiceConnection mServiceConnection = new ServiceConnection()
{
public void onServiceConnected(ComponentName name, IBinder service)
{
mxxxRemoteService = IxxxRemoteService.Stub.asInterface(service);
try {
mxxxRemoteService.sumabc(5, 5, 5);
}
catch (RemoteException e)
{
e.printStackTrace();
}
}
public void onServiceDisconnected(ComponentName name)
{
mxxxRemoteService = null;
}
};
@Override
public void onReceive(Context context, Intent intent)
{
Log.e(TAG, "===onReceive()===");
if(intent.getAction().equals("com.wandroid.servicedemo.Play_MUSIC"))
{
Intent i = new Intent();
//i.setClass(context, xxxRemoteService.class);
//context.bindService(i, mServiceConnection, BIND_AUTO_CREATE);
i.setClass(context, xxxService.class);
context.startService(i);
}
}
}
