Android平台通过native.js实现接收系统消息，如监听安装卸载apk事件

今天以监听apk安装、卸载为例，来说明系统广播(BroadcastReceiver)如何监听，代码如下：

    var receiver;  
    main = plus.android.runtimeMainActivity();//获取activity  
    receiver = plus.android.implements('io.dcloud.android.content.BroadcastReceiver',{  
        onReceive : function(context,intent){//实现onReceiver回调函数  
        plus.android.importClass(intent);//通过intent实例引入intent类，方便以后的‘.’操作  
        console.log(intent.getAction());//获取action  
        main.unregisterReceiver(receiver);//取消监听  
    }});  
    var IntentFilter = plus.android.importClass('android.content.IntentFilter');  
    var Intent = plus.android.importClass('android.content.Intent');  
    var filter = new IntentFilter();  
    filter.addAction(Intent.ACTION_PACKAGE_ADDED);//监听apk安装  
    filter.addAction(Intent.ACTION_PACKAGE_REMOVED);//监听apk卸载  
    filter.addDataScheme("package");  
    main.registerReceiver(receiver,filter);//注册监听