我有这样的屏幕结构.
Login Activity -> Main Activity with multiple tabs.
所以我在MainActivity中实现了与pushwoosh相关的逻辑.我想从注销logout取消注册,然后返回Login Activity.
我的代码如下.我已经过滤掉了与Pushwoosh无关的所有其他部分.坦率地说,这段代码与Pushwoosh文档here中的代码完全相似.唯一的区别在于onlogout()方法,我尝试从pushwoosh取消注册并返回LoginActivity.
Tabbaractivity.java
@OverrIDeprotected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //Pushwoosh Registration registerReceivers(); PushManager pushManager = PushManager.getInstance(this); pushManager.setNotificationFactory(new PushNotificationFactory()); try { pushManager.onStartup(this); } catch(Exception e) {} //Register for push! pushManager.registerForPushNotifications(); checkMessage(getIntent());} @OverrIDe protected voID onNewIntent(Intent intent) { super.onNewIntent(intent); setIntent(intent); checkMessage(intent);}@OverrIDeprotected voID onResume() { super.onResume(); registerReceivers();}@OverrIDeprotected voID onPause() { super.onPause(); unregisterReceivers();}broadcastReceiver mbroadcastReceiver = new BaseRegistrationReceiver() { @OverrIDe public voID onRegisteractionReceive(Context context,Intent intent) { checkMessage(intent); }};private broadcastReceiver mReceiver = new BasePushMessageReceiver() { @OverrIDe protected voID onMessageReceive(Intent intent) { //JsON_DATA_KEY contains JsON payload of push notification. }};public voID registerReceivers() { IntentFilter intentFilter = new IntentFilter( getPackagename() + ".action.PUSH_MESSAGE_RECEIVE"); registerReceiver(mReceiver,intentFilter,getPackagename() +".permission.C2D_MESSAGE",null); registerReceiver(mbroadcastReceiver,new IntentFilter( getPackagename() + "." + PushManager.REGISTER_broAD_CAST_ACTION));}public voID unregisterReceivers() { try { unregisterReceiver(mReceiver); } catch (Exception e) { e.printstacktrace(); } try { unregisterReceiver(mbroadcastReceiver); } catch (Exception e) { e.printstacktrace(); }}private voID checkMessage(Intent intent) { if (null != intent) { if (intent.hasExtra(PushManager.REGISTER_EVENT)) { uploadPushTokenToServer(PushManager.getPushToken(this)); } resetIntentValues(); }}private voID resetIntentValues() { Intent mainAppIntent = getIntent(); if (mainAppIntent.hasExtra(PushManager.PUSH_RECEIVE_EVENT)) { mainAppIntent.removeExtra(PushManager.PUSH_RECEIVE_EVENT); } else if (mainAppIntent.hasExtra(PushManager.REGISTER_EVENT)) { mainAppIntent.removeExtra(PushManager.REGISTER_EVENT); } else if (mainAppIntent.hasExtra(PushManager.UNREGISTER_EVENT)) { mainAppIntent.removeExtra(PushManager.UNREGISTER_EVENT); } else if (mainAppIntent.hasExtra(PushManager.REGISTER_ERROR_EVENT)) { mainAppIntent.removeExtra(PushManager.REGISTER_ERROR_EVENT); } else if (mainAppIntent.hasExtra(PushManager.UNREGISTER_ERROR_EVENT)) { mainAppIntent.removeExtra(PushManager.UNREGISTER_ERROR_EVENT); } setIntent(mainAppIntent);}//Finally on logoutprivate voID onlogout() { //other cleanup //pushwoosh PushManager.getInstance(this).unregisterForPushNotifications(); //goback to login activity}
我正在从服务器推送没有任何问题.我面临的唯一问题是在我注销并返回LoginActivity之后,Tabbaractivity仍保留在内存中,而后者又保留了许多其他片段和视图.我尝试使用MAT进行调试,这就是它所显示的内容.
Class name | Ref. Objects | Shallow Heap | Ref. Shallow Heap | Retained Heap--------------------------------------------------------------------------------------------------------------------------------------------------com.pushwoosh.internal.request.RequestManager @ 0x12f89ce0 Thread-1737 Thread| 1 | 88 | 360 | 536'- val$context in.myproject.activitIEs.Tabbaractivity @ 0x12d8ac40 | 1 | 360 | 360 | 18,520--------------------------------------------------------------------------------------------------------------------------------------------------
我还使用LeakCanary工具交叉检查相同,这也表明Pushwoosh正在坚持我的活动.
所以我的问题是,如何清理pushwoosh以避免我的活动泄露?
解决方法 通过简要地查看它们,您引用的文档就是一个示例,这些示例并不总是将API实现为具有其他活动的功能齐全的应用程序的最佳方式.我理解通过使用getInstance,你试图使用单例,但怀疑这不是很好管理.我将控制在您的应用程序持续时间内使用的PushManager实例.
问题可能是从作用域创建了多个PushManager实例,并在类中创建了多个pushManager实例,并且可能在程序的生命周期内.这会导致泄漏.
我将pushManager作为一个类变量,而不是使用PushManager.getInstance两次,并考虑创建一个静态的PushManager实例,用于应用程序的持续时间,就像在整个应用程序中使用单个数据库实例一样.
在班级:
PushManager pushManager;
并在oncreate中初始化
pushManager = PushManager.getInstance(this);//Finally on logoutprivate voID onlogout() { //other cleanup //pushwoosh // Here the first instance is left dangling. // PushManager.getInstance(this).unregisterForPushNotifications(); pushManager..unregisterForPushNotifications(); //goback to login activity}
这样你就可以清理pushmanager的一个实例的资源.
要使用app wIDe静态PushManager:
static PushManager pushManager;
初始化为:
pushManager = new PushManager(this.getApplicationContext());
When is a Singleton not a Singleton?
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