BlackBerry如何检查网络连接状态

该示例代码演示了如何检查BlackBerry设备的网络连接状态。通过使用net.rim.device.api.io.transport.TransportInfo类，它可以确定网络连接是否处于活动状态，并以布尔值的形式返回结果。

import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.io.transport.TransportInfo;
import net.rim.device.api.system.RadioInfo;

public class ConnectionUtil {
    public static boolean isNetworkAvailable() {
        if (RadioInfo.getActiveWAFs() == RadioInfo.WAF_3GPP || RadioInfo.getActiveWAFs() == RadioInfo.WAF_CDMA) {
            return (TransportInfo.hasSufficientCoverage(TransportInfo.TRANSPORT_TCP_CELLULAR)) ? true : false;
        } else if (RadioInfo.getActiveWAFs() == RadioInfo.WAF_WLAN) {
            return (TransportInfo.hasSufficientCoverage(TransportInfo.TRANSPORT_TCP_WIFI)) ? true : false;
        }
        return false;
    }

    public static void showConnectionStatus() {
        String message = isNetworkAvailable() ? "Network is available" : "Network is not available";
        Dialog.alert(message);
    }
}

//测试网络连接状态
public class MyApp extends UiApplication {
    public static void main(String[] args) {
        MyApp myApp = new MyApp();
        myApp.enterEventDispatcher();
    }

    private MyApp() {
        ConnectionUtil.showConnectionStatus();
    }
}

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