在Android中启动Service并通过多个活动与之通信

Question

Well I would like to communicate to a Service from multiple Activities, like everyone listen to a broadcast channel and update their Twitter statuses ..

My recent effort is to use Broadcast Receiver on each Activity to receive the broadcast sent from the Service. But I would like to know that it's a good way or not and what is the property way?

Furthermore, I would like to ask if i should use Binder to start this kind of service or use startService method (I am a beginner in using Service actually..).

Thanks in advance.

Answer 1

        OKay you are a beginner in Service means Refer this below Link 

http://developer.android.com/guide/components/services.html

        in your Question while you using service you must register in Manifest file..
        like this..

        for example i did unlock screen using service and broadcast receiver.

        <service
                    android:name="com.services.Unlock_Service"
                    android:enabled="true"
                    android:icon="@drawable/ic_launcher" >
                </service>

        unlockservice.java



        package com.services;

        import java.util.List;

        import android.annotation.SuppressLint;
        import android.app.Activity;
        import android.app.ActivityManager;
        import android.app.KeyguardManager;
        import android.app.Service;
        import android.app.KeyguardManager.KeyguardLock;
        import android.content.BroadcastReceiver;
        import android.content.ComponentName;
        import android.content.Context;
        import android.content.Intent;
        import android.content.IntentFilter;
        import android.os.IBinder;
        import android.os.PowerManager;
        import android.os.PowerManager.WakeLock;
        import android.util.Log;
        import android.widget.Toast;

        @SuppressWarnings("deprecation")
        public class Unlock_Service extends Service {
            ScreenBroadcastReceiver m_receiver;
            public String activityname;
            PowerManager pm;
            WakeLock wl;

            @Override
            public void onCreate() {
                IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
                filter.addAction(Intent.ACTION_SCREEN_OFF);
                m_receiver = new ScreenBroadcastReceiver();
                registerReceiver(m_receiver, filter);
                Log.d("Widgettool", "works");
            }

            @Override
            public int onStartCommand(Intent intent, int flags, int startId) {
                start();
                Toast.makeText(getBaseContext(), "SERVICE ON", Toast.LENGTH_SHORT)
                        .show();

                return START_STICKY;
            }

            @Override
            public void onDestroy() {
                stop();
                unregisterReceiver(m_receiver);
            }

            @SuppressLint("Wakelock")
            public void start() {
                try {

                    pm = (PowerManager) getSystemService(POWER_SERVICE);
                    wl = pm.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK
                            | PowerManager.ACQUIRE_CAUSES_WAKEUP, ".SensorActivity");
                    wl.acquire();
                    KeyguardManager mgr = (KeyguardManager) getSystemService(Activity.KEYGUARD_SERVICE);
                    KeyguardLock lock = mgr.newKeyguardLock(KEYGUARD_SERVICE);
                    lock.disableKeyguard();
                    // new TabActivityPacs().service();
                } catch (Exception e) {

                }

            }

            public void stop() {

                ActivityManager am = (ActivityManager) this
                        .getSystemService(ACTIVITY_SERVICE);
                List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
                Log.d("topActivity", "CURRENT Activity ::"
                        + taskInfo.get(0).topActivity.getClassName());
                activityname = taskInfo.get(0).topActivity.getClassName();
                ComponentName componentInfo = taskInfo.get(0).topActivity;
                componentInfo.getPackageName();

            }

            private class ScreenBroadcastReceiver extends BroadcastReceiver {

                @Override
                public void onReceive(Context context, Intent intent) {
                    if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
                        Log.d("ON SCREEN ON", "might hang here");
                        // start();
                        stop();

                    } else if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
                        start();
                        Log.d("SCREEN OFF", "might hang here");
                    }
                }

            }

            @Override
            public IBinder onBind(Intent intent) {

                return null;
            }

        }


    in your question... you have to use broadcast receiver in all activity then only you receive your corresponding information using service..