为什么InstanceID服务会自动启动，我该如何预防？

我有一个Android应用程序，我正在使用GCM。 我正在按照教程并使用InstanceIDListenerService类，我试图在用户输入一些信息的“订阅”页面之后将其作为IntentService 。 在幕后的启动画面上，还有一些初步代码在此订阅页面之前触发。 在我进入SubscriptionActivity之前，SplashScreen活动中正在调用InstanceIDListenerService构造函数（以及随后的onHandleIntent）。 它为什么这样做？ 意图服务是否可以从它自己开始？

我确实在AndroidManifest.xml文件中注册了服务，当我注释掉以下行时，它不会触发实例自动创建，应用程序按预期工作（直到我需要使用实例当然.. 。）

SplashScreen.java

 public class SplashScreen extends Activity { private BroadcastReceiver dbInsertReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Bundle bundle = intent.getExtras(); if(bundle != null) { // Handle results and move to next activity, should // be the subscribe activity where I want the instance // id listener to start. } } }; private BroadcastReceiver providerXMLReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { Bundle bundle = intent.getExtras(); if(bundle != null) { // Handle results and start the next service } } } }; /** Called when the activity is first created */ @Override public void onCreate(Bundle bundle) { super.onCreate(bundle); setContentView(R.layout.activity_splash_screen); // Kick off the service download to update the provider data Intent intent = new Intent(this, ProviderDataService.class); startService(intent); } @Override protected void onStart() { super.onStart(); registerReceiver(providerXMLReceiver, new IntentFilter(ProviderDataService.CHANNEL)); registerReceiver(dbInsertReceiver, new IntentFilter(InternalDBService.NOTIFICATION)); } @Override protected void onResume() { super.onResume(); registerReceiver(providerXMLReceiver, new IntentFilter(ProviderDataService.CHANNEL)); registerReceiver(dbInsertReceiver, new IntentFilter(InternalDBService.NOTIFICATION)); } @Override protected void onPause() { super.onPause(); unregisterReceiver(providerXMLReceiver); unregisterReceiver(dbInsertReceiver); } private void moveToNextActivity(int subscriptionStatus) { if(subscriptionStatus == DBSchemaHelper.IS_SUBSCRIBED_NOT_RESPONDED) { Intent subscribeIntent = new Intent(SplashScreen.this, SubscribeActivity.class); startActivity(subscribeIntent); } else { // Create an Intent that will start the Menu-Activity. Intent mainIntent = new Intent(SplashScreen.this, MainActivity.class); startActivity(mainIntent); } this.finish(); } 

SubscribeActivity.java

 public class SubscribeActivity extends CustomActionBarActivity { public static final int NO_SUBSCRIPTION_STATUS = -99; private DBMetaDataSource metaDao; private int subscribeResult; public SubscribeActivity() { metaDao = new DBMetaDataSource(this); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_subscribe); } @Override protected void onStart() { super.onStart(); registerReceiver(tokenResponseReceiver, new IntentFilter(InstanceIDListenerService.TAG)); } @Override protected void onResume() { super.onResume(); registerReceiver(tokenResponseReceiver, new IntentFilter(InstanceIDListenerService.TAG)); } @Override protected void onPause() { super.onPause(); unregisterReceiver(tokenResponseReceiver); } public void subscribeUser(View v) { EditText emailTextView = (EditText) findViewById(R.id.subscriptionUserEmail); String email = emailTextView.getText().toString(); // This is the only place I am manually starting this service. // I have set a breakpoint here, but I never hit it and the service // starts on its own and I hit the breakpoints in the service's // onHandleIntent method. Intent i = new Intent(this, InstanceIDListenerService.class); i.putExtra("email", email); startService(i); } public void goToNextActivity(View v) { // They pressed the button to NOT subscribe, so we are calling this from the // view rather than the intent receiver, meaning the view will not be null. if(v != null) { markUnsubscribed(); } /* Create an Intent that will start the Menu-Activity. */ Intent mainIntent = new Intent(SubscribeActivity.this, MainActivity.class); mainIntent.putExtra(MainActivity.SUBSCRIBE_STATUS_KEY, subscribeResult); startActivity(mainIntent); } private void markUnsubscribed() { metaDao.open(this); DBMeta metaData = metaDao.get(); metaDao.update(Long.valueOf(metaData.getVersion()), metaData.getLastRunInMillis(), DBSchemaHelper.IS_SUBSCRIBED_RESPONDED_NO, null); metaDao.close(); } private BroadcastReceiver tokenResponseReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { subscribeResult = intent.getIntExtra(InstanceIDListenerService.RESPONSE_KEY, NO_SUBSCRIPTION_STATUS); goToNextActivity(null); } }; } 

Answer 1

您不应该自己启动InstanceIDListenerService – 当您需要通过回调onTokenRefresh（）来刷新您的Instance ID令牌时系统会给您打电话 – 如果您尚未创建任何实例ID令牌，那么您’ d在第一次通话时没有工作要做。

如果您还有其他工作要做，您应该使用自己的服务。