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检查3g、4g是否已连接android

connectivity android

user934820 · 技术社区 · 10 年前

我使用下面的代码来检查手机或平板电脑上是否有任何类型的连接。它与WiFi和GPRS配合良好。不幸的是,我没有3g访问权限,因此我无法检查此代码是否有效。如果你们中有人能确认吗?它对电池寿命有多大影响?

 private  boolean chkConnectivity() {
    boolean isConnected = false;

    ConnectivityManager connManager = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo mWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
    android.net.NetworkInfo mobile = connManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
    if( mobile.isAvailable() && mobile.getDetailedState() == NetworkInfo.DetailedState.CONNECTED ){
        Toast.makeText(ctx, "3g", Toast.LENGTH_SHORT).show();
        return true;
    }
    if (mWifi.isAvailable() && mWifi.getDetailedState() == NetworkInfo.DetailedState.CONNECTED ) {
        Toast.makeText(ctx, "WiFi", Toast.LENGTH_SHORT).show();
        return true;
    }
    try {
        TelephonyManager mgr = (TelephonyManager) ctx.getSystemService(Context.TELEPHONY_SERVICE);
        int networkType = mgr.getNetworkType();
        if (networkType == TelephonyManager.NETWORK_TYPE_GPRS){
            Class cmClass = Class.forName(connManager.getClass().getName());
            Method method = cmClass.getDeclaredMethod("getMobileDataEnabled");
            method.setAccessible(true);
            isConnected = (Boolean)method.invoke(connManager);
            if (isConnected){
                Toast.makeText(ctx, "GPRS", Toast.LENGTH_SHORT).show();
                return isConnected;
            }
        }
        Toast.makeText(ctx, "No connection", Toast.LENGTH_SHORT).show();
        return isConnected;

    } catch (Exception e) {
        return false;
    }

}