Hi .... Dear All .... Today I am uploading a superb example of Service with it's life cycle.
Service
@ It's an Application component which has
1. Activity which has No layout
2. Running in Background
3. Used for long running
task
4. Service has it’s life cycle
Drawback
@ It's running with main thread so we should use asynctask with service
Type
1. Started 2. Bound
@ To create a service, you must create a subclass of Service.
@ In your implementation, you need to override some callback methods that handle key aspects of the service lifecycle and provide a mechanism for components to bind to the service.
@ Callback methods are onCreate(),onStartCommand(),onBind(),onDestroy().
See the below example - Register your service in manifest file
like <service android:name=".MyServ"></service>
A. Output will be like
B. XML file activity_main.xml is as
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.exam.ravi.servicedemo.MainActivity"> <Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="StartService"
android:id="@+id/button1"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_marginTop="44dp"
android:onClick="startServ"
android:layout_toStartOf="@+id/button2" /> <Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="StopService"
android:id="@+id/button2"
android:onClick="stopServ"
android:layout_alignTop="@+id/button1"
android:layout_alignParentEnd="true" /> </RelativeLayout>
C. Java Code is as
C - 1 Service class is as MyServ.java
package com.exam.ravi.servicedemo;
import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.support.annotation.Nullable; import android.widget.Toast; public class MyServ extends Service { @Nullable @Override public IBinder onBind(Intent intent)
// Used for Bind service Local or Remote { return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { Toast.makeText(this,"onstartcommand called",Toast.LENGTH_LONG).show(); return super.onStartCommand(intent, flags, startId); } @Override public void onCreate() { super.onCreate(); Toast.makeText(this,"onCreate called",Toast.LENGTH_LONG).show(); } @Override public void onDestroy() { super.onDestroy(); Toast.makeText(this,"onDestroy called",Toast.LENGTH_LONG).show(); } }
C - 2 MainActivity.java is as
package com.exam.ravi.servicedemo; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; public class MainActivity extends AppCompatActivity { Intent iob; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); iob=new Intent(this,MyServ.class); } public void startServ(View v) { startService(iob); } public void stopServ(View v) { stopService(iob); } }
