Service生命周期

知識(shí)點(diǎn):
Service中的onBind方法,返回IBinder接口,如果直接實(shí)現(xiàn),方法數(shù)太多,因此返回自定義MyBinder繼承Binder類(lèi)

@Override
public IBinder onBind(Intent intent) {
    return new IBinder() {
        @Override
        public String getInterfaceDescriptor() throws RemoteException {
            return null;
        }
        @Override
        public boolean pingBinder() {
            return false;
        }
        @Override
        public boolean isBinderAlive() {
            return false;
        }

合理的寫(xiě)法

@Override
public IBinder onBind(Intent intent) {
    Log.i("zhang","服務(wù) onBind");
    return new MyBinder();
}
public class MyBinder extends Binder {
    //自定義方法
    //比如 我要獲取這個(gè)service
    public MyService getService() {
        return MyService.this;
    }
}

綁定服務(wù)會(huì)隨著Activity結(jié)束而結(jié)束,啟動(dòng)服務(wù)則不受activity影響

MainActivity

    private ServiceConnection mConnection=new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.i("zhang","服務(wù) mConnection onServiceConnected");
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.i("zhang","服務(wù) mConnection disConnected");
        }
    };

    @butterknife.OnClick({R.id.start, R.id.stop, R.id.bind, R.id.unbind})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.start:
                Intent intent = new Intent(MainActivity.this, MyService.class);
                startService(intent);
                break;
            case R.id.stop:
                stopService(new Intent(MainActivity.this, MyService.class));
                break;
            case R.id.bind:
                Intent bindintent = new Intent(MainActivity.this, MyService.class);
                bindService(bindintent,mConnection,BIND_AUTO_CREATE);
                break;
            case R.id.unbind:
                unbindService(mConnection);
                break;
        }
    }

MyService

    @Override
    public IBinder onBind(Intent intent) {
        Log.i("zhang","服務(wù) onBind");
        return new MyBinder();
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i("zhang","服務(wù) onCreate");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("zhang","服務(wù) onStartCommand");
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i("zhang","服務(wù) onDestroy");
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.i("zhang","服務(wù) onUnbind");
        return super.onUnbind(intent);
    }

    public class MyBinder extends Binder {
        //自定義方法
        //比如 我要獲取這個(gè)service
        public MyService getService() {
            return MyService.this;
        }
    }

AndroidManifest

        <service
            android:name=".MyService">
        </service>

運(yùn)行

1. start -> stop

2. start -> start

3. bind -> unbind

bind也能創(chuàng)建service,執(zhí)行onCreate方法

4. bind -> start

bind之后start service,不會(huì)重新onCreate,只會(huì)執(zhí)行onStartCommond

5. bind -> start -> stop

6. bind -> start -> unbind

7.bind -> start -> unbind ->stop

同上5,6,7對(duì)比,說(shuō)明bind創(chuàng)建的Service,start之后,如果要銷(xiāo)毀service,必須先unbind,然后stop,才能銷(xiāo)毀

8. bind -> bind

9. bind -> start ->unbind ->bind

10. bind -> 點(diǎn)擊返回鍵

11. bind -> start ->點(diǎn)擊返回鍵

案例:

耗時(shí)操作放在onStartCommond中執(zhí)行
實(shí)時(shí)獲取線程中的值,需要bind
bind之后,start執(zhí)行,然后重復(fù)unbind bind操作,就可以通過(guò)serviceConn中的方法獲取值

MainActivity

    private ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {

            MyService.MyBinder binder = (MyService.MyBinder) service;
            int count = binder.getCount();
            Log.i("zhang", "      mConnection onServiceConnected  count " + count);
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.i("zhang", "服務(wù) mConnection disConnected");
        }
    };

MyService

    public int count = 0;

    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        Log.i("zhang","onBind");
        return new MyBinder();
    }

    @Override
    public void onCreate() {
        Log.i("zhang","onCreate");
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("zhang","onStartCommand");
        new Thread(new Runnable() {
            @Override
            public void run() {
                for (count = 0; count < 100; count++) {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.i("zhang","onUnbind");
        return super.onUnbind(intent);
    }

    public class MyBinder extends Binder {
        public int getCount(){
            return count;
        }
    }

結(jié)果:

start -> unbind -> bind -> unbind -> bind......