读取Wifi/3G状态时出现异常

Question

你好，我有以下代码可以读取网络/Wifi状态：

public String getMacAddress() {
    WifiManager wm = (WifiManager) context
            .getSystemService(Context.WIFI_SERVICE);
    return wm.getConnectionInfo().getMacAddress();
}

这会抛出一个异常

Caused by: java.lang.SecurityException: WifiService: Neither user 10032 nor current process has android.permission.ACCESS_WIFI_STATE

并且

public boolean is3G() {
    ConnectivityManager connectivityManager = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    return !(connectivityManager.getNetworkInfo(
            ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED || connectivityManager
            .getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED);
}

这会抛出异常。

Caused by: java.lang.SecurityException: ConnectivityService: Neither user 10032 nor current process has android.permission.ACCESS_NETWORK_STATE.

在有人告诉我权限之前，这是我的清单文件（相关部分）：

<manifest> 
   <!-- usual tags for activitys... etc.. -->

    <uses-permission android:name="android.permission.WRITE_OWNER_DATA" />
    <uses-permission android:name="android.permission.READ_OWNER_DATA" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <user-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <user-permission android:name="android.permission.ACCESS_WIFI_STATE" />
</manifest> 

- Marcos Vasconcelos

Answer 1

您拼错了最新的两个权限:

使用useS-permission代替useR-permission。

- BFil

Answer 2

您的清单文件权限有误。

您使用了 user-permission 而非 uses-permission。

- jkhouw1