android - 连接管理器 - android.net.conn.CONNECTIVITY_CHANGE

Question

我为 android.net.conn.CONNECTIVITY_CHANGE 创建了一个过滤器.
我确实收到了我的广播接收器的 Intent 。

我的问题是关于引发 connectivity_change 的原因。 API 描述说:

A change in network connectivity has occurred. A connection has either been established or lost. The NetworkInfo for the affected network is sent as an extra; it should be consulted to see what kind of connectivity event occurred.

我的 broadcastreceiver 似乎只在移动网络连接/断开时被调用(pdp 坏了)。它不会在例如 2g 切换到 3g 时引发。

我不能用这个广播接收器捕获 2g 到 3g 的交换吗？
我是否必须使用 phonestatelistener 来捕捉从 2g 到 3g 的交换？

Answer 1

你需要:

permission "android.permission.READ_PHONE_STATE"//获取连接变化(2G/3G/等) permission "android.permission.ACCESS_COARSE_LOCATION"//获取 Cell/Tower 更改

和

//Make the listener
listener = new PhoneStateListener() { 
    public void onDataConnectionStateChanged(int state, int networkType) 
    { 
       //We have changed proticols, for example we have gone from HSDPA to GPRS
       //HSDPA is an example of a 3G connection 
       //GPRS is an example of a 2G connection
    }
    public void onCellLocationChanged(CellLocation location) {
       //We have changed to a different Tower/Cell
    }
};

//Add the listener made above into the telephonyManager
telephonyManager.listen(listener, 
        PhoneStateListener.LISTEN_DATA_CONNECTION_STATE //connection changes 2G/3G/etc
        | PhoneStateListener.LISTEN_CELL_LOCATION       //or tower/cell changes 
);