如何将我的活动绑定到我当前在Android中运行的服务？

概述我有一个活动要用于显示从服务发送的数据.每当服务向活动发送消息时,活动都会更新textview.用户可以使用活动中的按钮来启动和停止服务(服务由用户明确启动/停止).目前,我的活动已绑定到onResume()中的服务,并取消了在onDestroy()中的绑定,而该服务似乎目前正在工作.当我启动服务,

我有一个活动要用于显示从服务发送的数据.每当服务向活动发送消息时,活动都会更新textvIEw.用户可以使用活动中的按钮来启动和停止服务(服务由用户明确启动/停止).目前,我的活动已绑定到onResume()中的服务,并取消了在onDestroy()中的绑定,而该服务似乎目前正在工作.

当我启动服务,按“后退”按钮,然后尝试再次聚焦活动时,会出现问题.我面临着一个新活动,该活动不会被服务更新,但似乎能够将消息发送到服务(我从处理程序中的Logs中注意到了这一点[男孩,这句话使我发笑了！]).理想情况下,我只希望活动的一个实例存在并保持与服务的绑定,但是我绝对不希望看到活动与更新保持同步.我已经用< activity android：launchMode =“ singletop”>更新了清单,但不确定是否可以帮上大忙.在以后恢复活动时,我该怎么做以确保我的活动重新绑定到该服务的现有实例？ (我想通过消息传递来实现此目的,我不想实现数据库或为此目的使用sharedprefereces).我在下面添加了我的代码-我对服务来说还比较陌生,所以请放轻松.干杯.

可选的额外：
我的目标是从startService()连续运行的服务,在该活动中重新聚焦活动是可选的,但是会立即显示该服务的最新信息.我相信我正在寻找的是前台服务.这不是问题的一部分,但是如果您认为您的答案可能会阻止我实现此目标,请告诉我.

MainActivity.java：

public class MainActivity extends Activity {    private static final String deBUG = "MainActivity";    private boolean bound = false;    TextVIEw mTextVIEw;    protected Messenger outMessenger;    @OverrIDe    public voID onCreate(Bundle savedInstanceState)     {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        Log.i(deBUG, "onCreate called");        mTextVIEw = (TextVIEw) findVIEwByID(R.ID.textVIEw1);        button bind = (button) findVIEwByID(R.ID.bind);        button unbind = (button) findVIEwByID(R.ID.unbind);        bind.setonClickListener(new OnClickListener()        {            public voID onClick(VIEw v)             {                Message message = new Message();                Bundle bundle = new Bundle();                bundle.putString("ACTION", "START");                message.setData(bundle);                try                {                    outMessenger.send(message);                } catch (remoteexception e)                {                    Log.d(deBUG, "She can't reach the service captain!");                }            }        });        unbind.setonClickListener(new OnClickListener()        {            public voID onClick(VIEw v)             {                Message message = new Message();                Bundle bundle = new Bundle();                bundle.putString("ACTION", "Stop");                message.setData(bundle);                try                {                    outMessenger.send(message);                } catch (remoteexception e)                {                    Log.d(deBUG, "She can't reach the service captain!");                }            }        });    }    @OverrIDe     public voID onPause()    {        super.onPause();    }    @OverrIDe    public voID onResume()    {        super.onResume();        dobindService();    }    public voID onDestroy()    {        super.onDestroy();        Log.i(deBUG, "onDestroy Called");        doUnbindService();    }    private voID dobindService()    {        Log.i(deBUG, "Attempting to bind");        bound = true;        Intent i = new Intent(this, MyService.class);        i.putExtra("MESSENGER", new Messenger(mHandler));        bindService(i, mConnection, Context.BIND_auto_CREATE);    }    private voID doUnbindService()    {        Log.i(deBUG, "Attempting to unbind");        if (bound)        {            bound = false;            unbindService(mConnection);        }    }    private Handler mHandler = new Handler()    {        public voID handleMessage(Message message)        {            Log.d(deBUG, "Got a message!");            Bundle data = message.getData();            if (data != null)            {                Log.i(deBUG, "This data ain't null!");                if (data.containsKey("MESSAGE"))                {                    mTextVIEw.setText(data.getString("MESSAGE"));                }            }        }    };    private ServiceConnection mConnection = new ServiceConnection()     {        public voID onServiceConnected(Componentname classname, IBinder binder)         {            Log.i(deBUG, "Service connected!");            outMessenger = new Messenger(binder);        }        @OverrIDe        public voID onServicedisconnected(Componentname classname)         {            Log.d(deBUG, "Service disconnected!");        }    };}

MyService.java

public class MyService extends Service{    private static final String deBUG = "MyService";    private Messenger inMessenger = new Messenger(new IncomingHandler());    Messenger outMessenger;    private boolean bound = false;    int secret = 0;    @OverrIDe    public voID onCreate()    {        Log.d(deBUG , "MyService Created");    }    @OverrIDe    public int onStartCommand(Intent intent, int flags, int startID)     {        Log.d(deBUG , "onStartCommand called");        handleCommand(intent);        return START_STICKY;    }    Handler handler = new Handler();    public boolean running;    voID handleCommand(Intent i)    {        Runnable r = new Runnable()        {            public voID run()            {                updateResultsInUi();                if (running)                {                    handler.postDelayed(this, 500);                }            }        };        r.run();    }    voID updateResultsInUi()    {        Bundle bundle = new Bundle();        bundle.putString("MESSAGE",                 Integer.toString(secret = ++secret % 10));        Message message = new Message();        message.setData(bundle);        if (bound)        {            try            {                outMessenger.send(message);            }             catch (remoteexception e)            {                Log.d(deBUG, "Messaging Failed");            }        }         else         {            Log.d(deBUG, "Not connected, so not messaging!");        }    }    @OverrIDe    public IBinder onBind(Intent intent)    {        Log.i(deBUG, "Bound");        bound = true;        Bundle extras = intent.getExtras();        outMessenger = (Messenger) extras.get("MESSENGER");        return inMessenger.getBinder();    }    @OverrIDe    public voID onRebind(Intent i)    {        bound = true;        Bundle extras = i.getExtras();        outMessenger = (Messenger) extras.get("MESSENGER");    }    @OverrIDe    public boolean onUnbind(Intent i)    {        Log.d(deBUG, "onUnbind() called.");        bound = false;        outMessenger = null;        return true;    }    class IncomingHandler extends Handler     {        @OverrIDe        public voID handleMessage(Message msg)         {            Log.d(deBUG, "Got message");            Bundle data = msg.getData();            if (data.containsKey("ACTION"))            {                if ("START".equals(data.getString("ACTION")))                {                    if (!running)                    {                        running = true;                        Intent i = new Intent(getApplicationContext(), MyService.class);                        startService(i);                    }                     else                     {                        Log.d(deBUG, "We're already up and running!");                    }                }                 else if ("Stop".equals(data.getString("ACTION")))                {                    running = false;                    Intent i = new Intent(getApplicationContext(), MyService.class);                    stopService(i);                }            }        }    }}

AndroIDManifest.xml

<manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"    package="com.tests.servicetest"    androID:versionCode="1"    androID:versionname="1.0" >    <uses-sdk        androID:minSdkVersion="8"        androID:targetSdkVersion="15" />    <application        androID:icon="@drawable/ic_launcher"        androID:label="@string/app_name"        androID:theme="@style/Apptheme" >        <activity            androID:name="com.tests.servicetest.MainActivity"            androID:label="@string/Title_activity_main"             androID:launchMode="singletop" >            <intent-filter>                <action androID:name="androID.intent.action.MAIN" />                <category androID:name="androID.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <service            androID:name="com.tests.servicetest.MyService"            androID:process=":inaneservice">        </service>    </application></manifest>

对于那些想要运行它的人,activity_main.xml

<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" >    <TextVIEw        androID:ID="@+ID/textVIEw1"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:layout_centerHorizontal="true"        androID:layout_centerVertical="true"        androID:padding="@dimen/padding_medium"        androID:text="@string/hello_world"        tools:context=".MainActivity" />    <button        androID:ID="@+ID/bind"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:layout_alignleft="@+ID/textVIEw1"        androID:layout_below="@+ID/textVIEw1"        androID:text="Start" />    <button        androID:ID="@+ID/unbind"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:layout_alignleft="@+ID/textVIEw1"        androID:layout_below="@+ID/bind"        androID:text="Stop" /></relativeLayout>

解决方法:

您可能要看一下：https://github.com/JonasGroeger/GPSService

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