getConnectionInfo（）异常

Question

鉴于此代码：

wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifi.getConnectionInfo();

...清单中的这一行：

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

我仍然得到例外：

WifiService: Neither user 10057 nor current process has android.permission.ACCESS_WIFI_STATE.

我正在使用Xoom，Honeycomb 3.1进行调试。

如果还有其他需要的信息，请询问。

编辑：添加了Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.android.WiFiDemo"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="12" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

    <application android:icon="@drawable/icon" android:label="@string/app_name" android:debuggable="true">
        <activity android:label="@string/app_name" android:name="WiFiDemo">
            <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
            <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
              <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>

Answer 1

尝试添加

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

修改

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.WiFiDemo"
    android:versionCode="1"
    android:versionName="1.0">
    <uses-sdk android:minSdkVersion="12" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    <application android:icon="@drawable/icon" android:label="@string/app_name"     android:debuggable="true">
        <activity android:label="@string/app_name" android:name="WiFiDemo">            
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Answer 2

试试这个：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.android.WiFiDemo"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="12" />

    <application android:icon="@drawable/icon" android:label="@string/app_name" android:debuggable="true">
        <activity android:label="@string/app_name" android:name="WiFiDemo">
              <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
</manifest>