android 中service的简单事例

public class ServiceDemoActivity extends Activity {
private static final String TAG = "ServiceDemoActivity";

Button bindBtn;
Button startBtn;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

bindBtn = (Button)findViewById(R.id.bindBtn);
startBtn = (Button)findViewById(R.id.startBtn);

bindBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Log.e(TAG, "bindBtn");
bindService(new Intent(ServiceDemo.ACTION), conn, BIND_AUTO_CREATE);
}
});

startBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Log.e(TAG, "startBtn");
startService(new Intent(ServiceDemo.ACTION));
}
});
}

ServiceConnection conn = new ServiceConnection() {
public void onServiceConnected(ComponentName name, IBinder service) {
Log.e(TAG, "onServiceConnected");
}
public void onServiceDisconnected(ComponentName name) {
Log.e(TAG, "onServiceDisconnected");
}
};
@Override
protected void onDestroy() {
Log.e(TAG, "onDestroy unbindService");
unbindService(conn);
super.onDestroy();
};
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
android:id="@+id/bindBtn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="绑定服务" />

<Button
android:id="@+id/startBtn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="启动服务" />

</LinearLayout>

public class ServiceDemo extends Service {
private static final String TAG = "ServiceDemo";
public static final String ACTION = "com.example.servicedemoactivity.ServiceDemo";

@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
Log.e(TAG, " onBind ");
return null;
}

@Override
public void onCreate() {
// TODO Auto-generated method stub
Log.e(TAG, " onCreate ");
super.onCreate();
}

@Override
public void onStart(Intent intent, int startId) {
// TODO Auto-generated method stub
Log.e(TAG, " 1onStart ");
super.onStart(intent, startId);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
Log.e(TAG, " onStartCommand ");
return super.onStartCommand(intent, flags, startId);
}

}

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.servicedemoactivity"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >

<activity android:name=".ServiceDemoActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>

<service android:name="com.example.servicedemoactivity.ServiceDemo">
<intent-filter >
<action android:name="com.example.servicedemoactivity.ServiceDemo"/>
</intent-filter>
</service>

</application>

</manifest>