Interactive between Activity and Service

Modify from last post Pass data from Activity to Service via Intent in startService(); a BroadcastReceiver is added in MyService, such that our main activity (AndroidServiceTestActivity) can send data (CMD) to service via another intent(MY_ACTION_FROMACTIVITY).



MyService.java

package com.AndroidServiceTest;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.widget.Toast;

public class MyService extends Service {
 
 MyServiceReceiver myServiceReceiver;

 final static String MY_ACTION = "MY_ACTION";
 final static String MY_ACTION_FROMACTIVITY = "MY_ACTION_FROMACTIVITY";
 
 public static final String CMD = "CMD";
 public static final int CMD_STOP = 1;
 boolean running;
 
 String initData;

 @Override
 public void onCreate() {
  // TODO Auto-generated method stub
  myServiceReceiver = new MyServiceReceiver();
  super.onCreate();
 }

 @Override
 public IBinder onBind(Intent arg0) {
  // TODO Auto-generated method stub
  return null;
 }

 @Override
 public int onStartCommand(Intent intent, int flags, int startId) {
  // TODO Auto-generated method stub
  
  IntentFilter intentFilter = new IntentFilter();
  intentFilter.addAction(MY_ACTION_FROMACTIVITY);
  registerReceiver(myServiceReceiver, intentFilter);
  running = true;
  
  initData = intent.getStringExtra("INIT_DATA");
  
  MyThread myThread = new MyThread();
  myThread.start();
  
  return super.onStartCommand(intent, flags, startId);
 }
 
 @Override
 public void onDestroy() {
  // TODO Auto-generated method stub
  this.unregisterReceiver(myServiceReceiver);
  super.onDestroy();
 }

 public class MyThread extends Thread{

  @Override
  public void run() {
   // TODO Auto-generated method stub
   int i = 0;
   while(running){
    try {
     Thread.sleep(5000);
     Intent intent = new Intent();
        intent.setAction(MY_ACTION);
       
        intent.putExtra("DATAPASSED", i);
        intent.putExtra("DATA_BACK", initData);
       
        sendBroadcast(intent);
       
        i++;
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   stopSelf();
  }

 }
 
 public class MyServiceReceiver extends BroadcastReceiver {

  @Override
  public void onReceive(Context arg0, Intent arg1) {
   // TODO Auto-generated method stub
   int hostCmd = arg1.getIntExtra(CMD, 0);
   if(hostCmd == CMD_STOP){
    running = false;
       stopSelf();
      
       Toast.makeText(MyService.this,
         "Service stopped by main Activity!",
         Toast.LENGTH_LONG).show();
   }
  }

 }

}

Modify main activity (AndroidServiceTestActivity.java) to send command to stop our service, by pressing of the Stop button.

package com.AndroidServiceTest;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class AndroidServiceTestActivity extends Activity {
 
 MyReceiver myReceiver;
 
 Button btnStop;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
       btnStop = (Button)findViewById(R.id.stop);
       btnStop.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    Intent intent = new Intent();
    intent.setAction(MyService.MY_ACTION_FROMACTIVITY);
    intent.putExtra(MyService.CMD, MyService.CMD_STOP);
    sendBroadcast(intent);
   }});

   }

 @Override
 protected void onStart() {
  // TODO Auto-generated method stub
  
       //Register BroadcastReceiver
       //to receive event from our service
       myReceiver = new MyReceiver();
       IntentFilter intentFilter = new IntentFilter();
       intentFilter.addAction(MyService.MY_ACTION);
       registerReceiver(myReceiver, intentFilter);
      
       //Start our own service
       Intent intent = new Intent(AndroidServiceTestActivity.this,
         com.AndroidServiceTest.MyService.class);
       intent.putExtra("INIT_DATA", "Data passed from Activity to Service in startService");
       startService(intent);
  
  super.onStart();
 }

 @Override
 protected void onStop() {
  // TODO Auto-generated method stub
  unregisterReceiver(myReceiver);
  super.onStop();
 }
 
 private class MyReceiver extends BroadcastReceiver{

  @Override
  public void onReceive(Context arg0, Intent arg1) {
   // TODO Auto-generated method stub
   
   int datapassed = arg1.getIntExtra("DATAPASSED", 0);
   String orgData = arg1.getStringExtra("DATA_BACK");
   
   Toast.makeText(AndroidServiceTestActivity.this,
     "Triggered by Service!\n"
     + "Data passed: " + String.valueOf(datapassed) + "\n"
     + "original Data: " + orgData,
     Toast.LENGTH_LONG).show();
   
  }
  
 }
}

Modify layout to add the Stop button.

<?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/stop"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Stop"
   />
</LinearLayout>