Pass data from Activity To Service
Description
The following code shows how to Pass data from Activity To Service.
Example
Populate the MyService.java file with the following code:
package com.java2s.myapplication3.app;
/*from w w w . j a v a 2 s . co m*/
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Timer;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;
import android.os.Binder;
import android.os.IBinder;
public class MyService extends Service {
int counter = 0;
URL[] urls;
static final int UPDATE_INTERVAL = 1000;
private Timer timer = new Timer();
private final IBinder binder = new MyBinder();
public class MyBinder extends Binder {
MyService getService() {
return MyService.this;
}
}
@Override
public IBinder onBind(Intent arg0) {
return binder;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText (this, "Service Started", Toast.LENGTH_LONG).show();
try {
DownloadFile(new URL("http://java2s.com"));
} catch (MalformedURLException e) {
e.printStackTrace();
}
return START_STICKY;
}
private int DownloadFile(URL url) {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return 100;
}
@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText (this, "Service Destroyed", Toast.LENGTH_LONG).show();
}
}
In the AndroidManifest.xml file, add the following statement:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.java2s.Services"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="14" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".ServicesActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".MyService" />
</application>
</manifest>
Main layout xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button android:id="@+id/btnStartService"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Start Service"
android:onClick="startService"/>
<Button android:id="@+id/btnStopService"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Stop Service"
android:onClick="stopService" />
</LinearLayout>
Main Activity Java code
package com.java2s.myapplication3.app;
//from w w w . j av a 2s . c o m
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.widget.Toast;
import java.net.MalformedURLException;
import java.net.URL;
public class MainActivity extends Activity {
IntentFilter intentFilter;
MyService serviceBinder;
Intent i;
private ServiceConnection connection = new ServiceConnection() {
public void onServiceConnected(
ComponentName className, IBinder service) {
serviceBinder = ((MyService.MyBinder)service).getService();
try {
URL[] urls = new URL[] {
new URL("http://www.java2s.com/somefiles.pdf"),
new URL("http://www.java2s.net/somefiles.pdf")};
serviceBinder.urls = urls;
} catch (MalformedURLException e) {
e.printStackTrace();
}
startService(i);
}
public void onServiceDisconnected(ComponentName className) {
serviceBinder = null;
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public void onResume() {
super.onResume();
//intent to filter for file downloaded intent
intentFilter = new IntentFilter();
intentFilter.addAction("FILE_DOWNLOADED_ACTION");
//register the receiver
registerReceiver(intentReceiver, intentFilter);
}
@Override
public void onPause() {
super.onPause();
//unregister the receiver
unregisterReceiver(intentReceiver);
}
public void startService(View view) {
i = new Intent(MainActivity.this, MyService.class);
bindService(i, connection, Context.BIND_AUTO_CREATE);
}
public void stopService(View view) {
stopService(new Intent(getBaseContext(), MyService.class));
}
private BroadcastReceiver intentReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText (getBaseContext(), "File downloaded!",
Toast.LENGTH_LONG).show();
}
};
}
Note
Clicking the Start Service button will start the service. To stop the service, click the Stop Service button.