如何在Dashclock扩展中维护持久的BroadcastReceiver?

时间:2013-08-14 11:10:02

标签: java android broadcastreceiver android-broadcast dashclock

这是我的Dashclock扩展的脚手架代码。它从GCM接收消息并显示信息。

public class ComputerWidget extends DashClockExtension {

    private MessageReceiver objMessageReceiver;
    private class MessageReceiver extends BroadcastReceiver {    
        @Override
        public void onReceive(Context ctxContext, Intent ittIntent) {    
            GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(ctxContext);
            String strType = gcm.getMessageType(ittIntent);    
            if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE.equals(strType)) {    
                showInformation(ittIntent.getExtras());    
            }    
        }    
    }

    @Override
    protected void onInitialize(boolean booReconnect) {    
        super.onInitialize(booReconnect);    
        if (objMessageReceiver != null) {    
            try {    
                unregisterReceiver(objMessageReceiver);    
            } catch (Exception e) {
                e.printStackTrace();
            }    
        }

        IntentFilter intentFilter = new IntentFilter("com.google.android.c2dm.intent.RECEIVE");
        intentFilter.addCategory("com.something.something");    
        objMessageReceiver = new MessageReceiver();
        registerReceiver(objMessageReceiver, intentFilter);
    }

    public void onCreate() {    
        super.onCreate();    
    }

    protected void showInformation(Bundle bndBundle) {    
        final ExtensionData edtInformation = new ExtensionData();
        setUpdateWhenScreenOn(true);    
        try {    
            if (bndBundle.getString("event").equalsIgnoreCase("logon")) {    
                edtInformation.visible(true);
                    edtInformation.expandedTitle(bndBundle.getString("machine"));
                edtInformation.expandedBody(getString(R.string.logon, bndBundle.getString("username")));
                    }    
        } catch (Exception e) {
            edtInformation.visible(false);
        }    
        edtInformation.icon(R.drawable.ic_dashclock);
        publishUpdate(edtInformation);
    }

    public void onDestroy() {    
        super.onDestroy();    
        if (objMessageReceiver != null) {    
            try {    
                unregisterReceiver(objMessageReceiver);    
            } catch (Exception e) {
                e.printStackTrace();
            }    
        }    
    }

    @Override
    protected void onUpdateData(int arg0) {    
        setUpdateWhenScreenOn(true);
        System.out.println("Update");    
    }

}

正如您所看到的,当我的扩展程序初始化时,我正在注册我的GCM BroadcastReceiver,并且当扩展程序被销毁时我将注销它。

只要接收器被初始化,这段代码就可以正常工作但Dashclock在一段时间不活动后会破坏扩展,因此我无法接收任何GCM消息。

如何让BroadcastReceiver保持活着以便我能收到GCM消息?有没有办法以编程方式完成此操作,而不是通过清单文件?

在我关于BroadcastRecievers - How do I publish an update to Dashclock when my application receives an Intent?

的上一个问题之后,我找到了这个解决方案

1 个答案:

答案 0 :(得分:1)

  

如何保持BroadcastReceiver处于活动状态以便我可以接收GCM消息?

在清单中注册它,就像GCM样本显示的那样。

  

有没有办法以编程方式完成此操作,而不是通过清单文件?

不,但您可以通过PackageManagersetComponentEnabledSetting()启用和停用清单注册的接收器。