android.app.Service is an application component representing either an application's desire to perform a longer-running operation while not interacting with the user or to supply functionality for other applications to use. Each service class must have a corresponding
declaration in its package's
AndroidManifest.xml. Services can be started with
Context.startService() and
Context.bindService(). (
Ref: Service | Android Developers)
This exercise is a simple app with a dummy Local Service. Through the exercise, what can be noted are the life-cycle of a Service, how to link with Service with Start Service, Stop Service, Bind Service and Unbind Service, also the steps to implement the app with Service.
Create a New Android Application as normal, with the main activity AndroidService.
Create a new class MyService extends Service. It's our service.
package com.exercise.AndroidService;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.widget.Toast;
public class MyService extends Service {
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
Toast.makeText(this,
"-MyService.onBind()-", Toast.LENGTH_LONG).show();
return null;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
Toast.makeText(this,
"-MyService.onCreate()-", Toast.LENGTH_LONG).show();
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
Toast.makeText(this,
"-MyService.onDestroy()-", Toast.LENGTH_LONG).show();
}
@Override
public void onRebind(Intent intent) {
// TODO Auto-generated method stub
Toast.makeText(this,
"-MyService.onRebind()-", Toast.LENGTH_LONG).show();
}
@Override
public void onStart(Intent intent, int startId) {
// TODO Auto-generated method stub
Toast.makeText(this,
"-MyService.onStart()-", Toast.LENGTH_LONG).show();
}
@Override
public boolean onUnbind(Intent intent) {
// TODO Auto-generated method stub
Toast.makeText(this,
"-MyService.onUnbind()-", Toast.LENGTH_LONG).show();
return false;
}
public class LocalBinder extends Binder{
MyService getService(){
return MyService.this;
}
}
}
Modify main.xml to have four button to involve our expected task, Start Service, Stop Service, Bind Service and Unbind Service.
<?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: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="Start Service"
/>
<Button
android:id="@+id/stopservice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Stop Service"
/>
<Button
android:id="@+id/bindservice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Bind Service"
/>
<Button
android:id="@+id/unbindservice"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Unbind Service"
/>
</LinearLayout>
Modify the main activity, AndroidService.java.
package com.exercise.AndroidService;
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.view.View;
import android.widget.Button;
import android.widget.Toast;
public class AndroidService extends Activity {
private MyService myService;
private boolean serviceIsBinding;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button buttonStartService = (Button)findViewById(R.id.startservice);
Button buttonStopService = (Button)findViewById(R.id.stopservice);
Button buttonBindService = (Button)findViewById(R.id.bindservice);
Button buttonUnbindService = (Button)findViewById(R.id.unbindservice);
buttonStartService.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startService();
Toast.makeText(AndroidService.this,
"Start Service", Toast.LENGTH_LONG).show();
}});
buttonStopService.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
stopService();
Toast.makeText(AndroidService.this,
"Stop Service", Toast.LENGTH_LONG).show();
}});
buttonBindService.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
bindService();
Toast.makeText(AndroidService.this,
"Bind Service", Toast.LENGTH_LONG).show();
}});
buttonUnbindService.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
unbindService();
Toast.makeText(AndroidService.this,
"Unbind Service", Toast.LENGTH_LONG).show();
}});
}
private ServiceConnection serviceConnection = new ServiceConnection(){
@Override
public void onServiceConnected(ComponentName arg0, IBinder arg1) {
// TODO Auto-generated method stub
myService = ((MyService.LocalBinder)arg1).getService();
Toast.makeText(AndroidService.this,
"onServiceConnected()", Toast.LENGTH_LONG).show();
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
// TODO Auto-generated method stub
myService = null;
Toast.makeText(AndroidService.this,
"onServiceDisconnected()", Toast.LENGTH_LONG).show();
}};
private void startService(){
Intent intentService = new Intent(this, MyService.class);
this.startService(intentService);
}
private void stopService(){
Intent intentService = new Intent(this, MyService.class);
this.stopService(intentService);
}
private void bindService(){
Intent intentService = new Intent(this, MyService.class);
bindService(intentService, serviceConnection, Context.BIND_AUTO_CREATE);
serviceIsBinding = true;
}
private void unbindService(){
if(serviceIsBinding){
unbindService(serviceConnection);
serviceIsBinding = false;
}
}
}
In with, ServiceConnection is the interface for monitoring the state of an application service.
Finally, modify AndroidManifest.xml to add the <service> element.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.exercise.AndroidService"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".AndroidService"
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:enabled="true" android:name="MyService"></service>
</application>
<uses-sdk android:minSdkVersion="7" />
</manifest>
Download the files.
Chronic Dev will be releasing greenpois0n on 10/10. This JB will include iPhone 4, iPod Touch 4, and iPad. As of now, it will not include any other device due to the changes from previous devices' bootroms. I've been busy helping Chronic Dev Team and will continue working on TinyUmbrella once we've released greenpois0n.
Being a command line junkie, I find the default bash shell settings on the Mac need a few tweaks. Only two files need to be changed, the bash login configuration file (.bash_profile) and the bash run control file (.bashrc). A good explanation of both can be found here. 
