public abstract class IntentService extends Service
Service
s that handle asynchronous
requests (expressed as Intent
s) on demand. Clients send requests
through Context.startService(Intent)
calls; the
service is started as needed, handles each Intent in turn using a worker
thread, and stops itself when it runs out of work.
This "work queue processor" pattern is commonly used to offload tasks
from an application's main thread. The IntentService class exists to
simplify this pattern and take care of the mechanics. To use it, extend
IntentService and implement onHandleIntent(Intent)
. IntentService
will receive the Intents, launch a worker thread, and stop the service as
appropriate.
All requests are handled on a single worker thread -- they may take as long as necessary (and will not block the application's main loop), but only one request will be processed at a time.
For a detailed discussion about how to create services, read the Services developer guide.
AsyncTask
Service.StartArgFlags, Service.StartResult, Service.StopForegroundFlags
Context.BindServiceFlags, Context.CreatePackageOptions, Context.ServiceName
START_CONTINUATION_MASK, START_FLAG_REDELIVERY, START_FLAG_RETRY, START_NOT_STICKY, START_REDELIVER_INTENT, START_STICKY, START_STICKY_COMPATIBILITY, START_TASK_REMOVED_COMPLETE, STOP_FOREGROUND_DETACH, STOP_FOREGROUND_REMOVE
ACCESSIBILITY_SERVICE, ACCOUNT_SERVICE, ACTIVITY_SERVICE, ALARM_SERVICE, APP_OPS_SERVICE, APPWIDGET_SERVICE, AUDIO_SERVICE, BACKUP_SERVICE, BATTERY_SERVICE, BIND_ABOVE_CLIENT, BIND_ADJUST_WITH_ACTIVITY, BIND_ALLOW_OOM_MANAGEMENT, BIND_ALLOW_WHITELIST_MANAGEMENT, BIND_AUTO_CREATE, BIND_DEBUG_UNBIND, BIND_EXTERNAL_SERVICE, BIND_FOREGROUND_SERVICE, BIND_FOREGROUND_SERVICE_WHILE_AWAKE, BIND_IMPORTANT, BIND_NOT_FOREGROUND, BIND_NOT_VISIBLE, BIND_SHOWING_UI, BIND_TREAT_LIKE_ACTIVITY, BIND_VISIBLE, BIND_WAIVE_PRIORITY, BLUETOOTH_SERVICE, CAMERA_SERVICE, CAPTIONING_SERVICE, CARRIER_CONFIG_SERVICE, CLIPBOARD_SERVICE, CONNECTIVITY_SERVICE, CONSUMER_IR_SERVICE, CONTEXT_CREDENTIAL_PROTECTED_STORAGE, CONTEXT_DEVICE_PROTECTED_STORAGE, CONTEXT_IGNORE_SECURITY, CONTEXT_INCLUDE_CODE, CONTEXT_REGISTER_PACKAGE, CONTEXT_RESTRICTED, CONTEXTHUB_SERVICE, COUNTRY_DETECTOR, DEVICE_IDLE_CONTROLLER, DEVICE_POLICY_SERVICE, DISPLAY_SERVICE, DOWNLOAD_SERVICE, DROPBOX_SERVICE, ETHERNET_SERVICE, FINGERPRINT_SERVICE, GATEKEEPER_SERVICE, HARDWARE_PROPERTIES_SERVICE, HDMI_CONTROL_SERVICE, INPUT_METHOD_SERVICE, INPUT_SERVICE, JOB_SCHEDULER_SERVICE, KEYGUARD_SERVICE, LAUNCHER_APPS_SERVICE, LAYOUT_INFLATER_SERVICE, LOCATION_SERVICE, MEDIA_PROJECTION_SERVICE, MEDIA_ROUTER_SERVICE, MEDIA_SESSION_SERVICE, MIDI_SERVICE, MODE_APPEND, MODE_ENABLE_WRITE_AHEAD_LOGGING, MODE_MULTI_PROCESS, MODE_NO_LOCALIZED_COLLATORS, MODE_PRIVATE, MODE_WORLD_READABLE, MODE_WORLD_WRITEABLE, NETWORK_POLICY_SERVICE, NETWORK_SCORE_SERVICE, NETWORK_STATS_SERVICE, NETWORKMANAGEMENT_SERVICE, NFC_SERVICE, NOTIFICATION_SERVICE, NSD_SERVICE, PERSISTENT_DATA_BLOCK_SERVICE, POWER_SERVICE, PRINT_SERVICE, RADIO_SERVICE, RECOVERY_SERVICE, RESTRICTIONS_SERVICE, SEARCH_SERVICE, SENSOR_SERVICE, SERIAL_SERVICE, SHORTCUT_SERVICE, SIP_SERVICE, SOUND_TRIGGER_SERVICE, STATUS_BAR_SERVICE, STORAGE_SERVICE, SYSTEM_HEALTH_SERVICE, TELECOM_SERVICE, TELEPHONY_SERVICE, TELEPHONY_SUBSCRIPTION_SERVICE, TEXT_SERVICES_MANAGER_SERVICE, TRUST_SERVICE, TV_INPUT_SERVICE, UI_MODE_SERVICE, UPDATE_LOCK_SERVICE, USAGE_STATS_SERVICE, USB_SERVICE, USER_SERVICE, VIBRATOR_SERVICE, VOICE_INTERACTION_MANAGER_SERVICE, WALLPAPER_SERVICE, WIFI_NAN_SERVICE, WIFI_P2P_SERVICE, WIFI_RTT_SERVICE, WIFI_SCANNING_SERVICE, WIFI_SERVICE, WINDOW_SERVICE
TRIM_MEMORY_BACKGROUND, TRIM_MEMORY_COMPLETE, TRIM_MEMORY_MODERATE, TRIM_MEMORY_RUNNING_CRITICAL, TRIM_MEMORY_RUNNING_LOW, TRIM_MEMORY_RUNNING_MODERATE, TRIM_MEMORY_UI_HIDDEN
Constructor and Description |
---|
IntentService(String name)
Creates an IntentService.
|
Modifier and Type | Method and Description |
---|---|
IBinder |
onBind(Intent intent)
Unless you provide binding for your service, you don't need to implement this
method, because the default implementation returns null.
|
void |
onCreate()
Called by the system when the service is first created.
|
void |
onDestroy()
Called by the system to notify a Service that it is no longer used and is being removed.
|
protected abstract void |
onHandleIntent(Intent intent)
This method is invoked on the worker thread with a request to process.
|
void |
onStart(Intent intent,
int startId) |
int |
onStartCommand(Intent intent,
int flags,
int startId)
You should not override this method for your IntentService.
|
void |
setIntentRedelivery(boolean enabled)
Sets intent redelivery preferences.
|
attach, dump, getApplication, onConfigurationChanged, onLowMemory, onRebind, onTaskRemoved, onTrimMemory, onUnbind, setForeground, startForeground, stopForeground, stopForeground, stopSelf, stopSelf, stopSelfResult
attachBaseContext, bindService, bindServiceAsUser, canStartActivityForResult, checkCallingOrSelfPermission, checkCallingOrSelfUriPermission, checkCallingPermission, checkCallingUriPermission, checkPermission, checkPermission, checkSelfPermission, checkUriPermission, checkUriPermission, checkUriPermission, clearWallpaper, createApplicationContext, createConfigurationContext, createCredentialProtectedStorageContext, createDeviceProtectedStorageContext, createDisplayContext, createPackageContext, createPackageContextAsUser, databaseList, deleteDatabase, deleteFile, deleteSharedPreferences, enforceCallingOrSelfPermission, enforceCallingOrSelfUriPermission, enforceCallingPermission, enforceCallingUriPermission, enforcePermission, enforceUriPermission, enforceUriPermission, fileList, getApplicationContext, getApplicationInfo, getAssets, getBaseContext, getBasePackageName, getCacheDir, getClassLoader, getCodeCacheDir, getContentResolver, getDatabasePath, getDataDir, getDir, getDisplay, getDisplayAdjustments, getExternalCacheDir, getExternalCacheDirs, getExternalFilesDir, getExternalFilesDirs, getExternalMediaDirs, getFilesDir, getFileStreamPath, getMainLooper, getNoBackupFilesDir, getObbDir, getObbDirs, getOpPackageName, getPackageCodePath, getPackageManager, getPackageName, getPackageResourcePath, getResources, getSharedPreferences, getSharedPreferences, getSharedPreferencesPath, getSystemService, getSystemServiceName, getTheme, getThemeResId, getUserId, getWallpaper, getWallpaperDesiredMinimumHeight, getWallpaperDesiredMinimumWidth, grantUriPermission, isCredentialProtectedStorage, isDeviceProtectedStorage, isRestricted, moveDatabaseFrom, moveSharedPreferencesFrom, openFileInput, openFileOutput, openOrCreateDatabase, openOrCreateDatabase, peekWallpaper, registerReceiver, registerReceiver, registerReceiverAsUser, removeStickyBroadcast, removeStickyBroadcastAsUser, revokeUriPermission, sendBroadcast, sendBroadcast, sendBroadcast, sendBroadcast, sendBroadcastAsUser, sendBroadcastAsUser, sendBroadcastAsUser, sendBroadcastMultiplePermissions, sendOrderedBroadcast, sendOrderedBroadcast, sendOrderedBroadcast, sendOrderedBroadcast, sendOrderedBroadcastAsUser, sendOrderedBroadcastAsUser, sendOrderedBroadcastAsUser, sendStickyBroadcast, sendStickyBroadcastAsUser, sendStickyBroadcastAsUser, sendStickyOrderedBroadcast, sendStickyOrderedBroadcastAsUser, setTheme, setWallpaper, setWallpaper, startActivities, startActivities, startActivitiesAsUser, startActivity, startActivity, startActivityAsUser, startActivityAsUser, startActivityForResult, startInstrumentation, startIntentSender, startIntentSender, startService, startServiceAsUser, stopService, stopServiceAsUser, unbindService, unregisterReceiver
bindServiceAsUser, createCredentialEncryptedStorageContext, createDeviceEncryptedStorageContext, getColor, getColorStateList, getDrawable, getSharedPrefsFile, getString, getString, getSystemService, getText, isCredentialEncryptedStorage, isDeviceEncryptedStorage, migrateDatabaseFrom, migrateSharedPreferencesFrom, obtainStyledAttributes, obtainStyledAttributes, obtainStyledAttributes, obtainStyledAttributes, registerComponentCallbacks, unregisterComponentCallbacks
public IntentService(String name)
name
- Used to name the worker thread, important only for debugging.public void setIntentRedelivery(boolean enabled)
If enabled is true,
onStartCommand(Intent, int, int)
will return
Service.START_REDELIVER_INTENT
, so if this process dies before
onHandleIntent(Intent)
returns, the process will be restarted
and the intent redelivered. If multiple Intents have been sent, only
the most recent one is guaranteed to be redelivered.
If enabled is false (the default),
onStartCommand(Intent, int, int)
will return
Service.START_NOT_STICKY
, and if the process dies, the Intent
dies along with it.
public void onCreate()
Service
public int onStartCommand(Intent intent, int flags, int startId)
onHandleIntent(android.content.Intent)
, which the system calls when the IntentService
receives a start request.onStartCommand
in class Service
intent
- The Intent supplied to Context.startService(android.content.Intent)
,
as given. This may be null if the service is being restarted after
its process has gone away, and it had previously returned anything
except Service.START_STICKY_COMPATIBILITY
.flags
- Additional data about this start request. Currently either
0, Service.START_FLAG_REDELIVERY
, or Service.START_FLAG_RETRY
.startId
- A unique integer representing this specific request to
start. Use with Service.stopSelfResult(int)
.Service.START_CONTINUATION_MASK
bits.Service.onStartCommand(android.content.Intent, int, int)
public void onDestroy()
Service
public IBinder onBind(Intent intent)
onBind
in class Service
intent
- The Intent that was used to bind to this service,
as given to Context.bindService
. Note that any extras that were included with
the Intent at that point will not be seen here.Service.onBind(android.content.Intent)
protected abstract void onHandleIntent(Intent intent)
Service.stopSelf()
.intent
- The value passed to Context.startService(Intent)
.
This may be null if the service is being restarted after
its process has gone away; see
Service.onStartCommand(android.content.Intent, int, int)
for details.