Question

我在我的service活动中开始onCreate()，代码如下：

public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    application = (OldBookApplication) this.getApplicationContext();
    util=new SharePreferenceUtil(LoginActivity.this, Constants.SAVE_USER);
    Utils.getScreenWidth(this);
    Utils.getScreenHeight(this);
    Utils.getScreenDensity(this);
    StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());
    StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectLeakedSqlLiteObjects().detectLeakedSqlLiteObjects().penaltyLog().penaltyDeath().build());
    if (isNetworkAvailable())
    {

        Intent service = new Intent(LoginActivity.this, GetMsgService.class);
        startService(service);
    }
    else
    {
        //show("no network");
    }
}

@Override
protected void onResume()
{
    super.onResume();

    checkServer();

    autoLogin();
}

和checkServer()功能如下：

private void checkServer()
{
    if(!application.isClientStart())
    {
        Intent intent=new Intent(LoginActivity.this,SettingActivity.class);
        LoginActivity.this.startActivity(intent);
        LoginActivity.this.finish();
    }
}

我的服务代码如下：

public class GetMsgService extends Service
{
    private OldBookApplication application;
    private Client client;
    private NotificationManager mNotificationManager;
    private boolean isStart = false;
    private Notification mNotification;
    private Context mContext = this;
    private SharePreferenceUtil util;
    private MessageDB messageDB;              //<-----

    private BroadcastReceiver backKeyReceiver = new BroadcastReceiver()
    {

        @Override
        public void onReceive(Context context, Intent intent)
        {
            // TODO Auto-generated method stub
            Toast.makeText(context, "", Toast.LENGTH_LONG).show();
            setMsgNotification();
        }
    };
    private Handler handler = new Handler()
    {
        public void handleMessage(Message msg)
        {
            switch (msg.what)
            {
                case MSG:
                ......
            }

@Override
public IBinder onBind(Intent intent)
{
    return null;
}

@Override
public void onCreate()     
{
    StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());
    StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectLeakedSqlLiteObjects().detectLeakedSqlLiteObjects().penaltyLog().penaltyDeath().build());
    messageDB = new MessageDB(this);
    IntentFilter filter = new IntentFilter();
    filter.addAction(Constants.BACKKEY_ACTION);
    registerReceiver(backKeyReceiver, filter);
    mNotificationManager = (NotificationManager) getSystemService(android.content.Context.NOTIFICATION_SERVICE);
    application = (OldBookApplication) this.getApplicationContext();
    client = application.getClient();
    application.setmNotificationManager(mNotificationManager);
    super.onCreate();

}

@Override
public int onStartCommand(Intent intent,int flag, int startId)
{
    super.onStartCommand(intent,flag, startId);
    util = new SharePreferenceUtil(getApplicationContext(),
            Constants.SAVE_USER);
    isStart = client.start();
    application.setClientStart(isStart);
    if (isStart)
    {
        ClientInputThread in = client.getClientInputThread();
        in.setMessageListener(new MessageListener()
        {
            @Override
            public void Message(MessageEntity msg) 
            {

                if (util.getIsStart())
                {
                    if (msg.getType() == MessageType.MESSAGE)
                    {
                        ......
                    }
                }
                else
                {
                    Intent broadCast = new Intent();
                    broadCast.setAction(Constants.ACTION);
                    broadCast.putExtra(Constants.MSGKEY, msg);
                    sendBroadcast(broadCast);
                }
            }
        });
    }
    return START_REDELIVER_INTENT;
}

@Override
public void onDestroy()
{
    super.onDestroy();
    if (messageDB != null)
        messageDB.close();
    unregisterReceiver(backKeyReceiver);
    mNotificationManager.cancel(Constants.NOTIFY_ID);
}

}

程序的运行顺序是 LoginActivity的onCreate() ---＆gt; LoginActivity的onResume() ---＆GT; autoLogin()功能 ---＆gt; SettingActivity的onCreate() ---＆gt; GetMsgService的onCreate() ---＆gt; GetMsgService的onStartCommand()

我想知道为什么在onCreate()没有调用GetMsgService的startService()？和SettingActivity一样的问题。

Answer 1

Start your Service in Application class which extends Application so when your

应用程序启动首先启动您的服务。

Answer 2

方法startActivity()和startService()以异步方式运行。在执行请求的操作之前，对这些方法的调用将返回。从概念上讲，请求的操作将添加到系统事件队列中，并在以后执行。

为什么Android服务启动顺序错误？

2 个答案: