android 7.1 "移动网络" 选项 不存在问题。
1、celluar networks 字符串定义
首先在设置APK的资源文件去找到这一串字符
<!-- Wireless controls, item title to go into the network settings -->
<string name="network_settings_title">Mobile networks</string>
2、network_settings_title引用
packages/apps/Settings/src/com/android/settings/WirelessSettings.java中找到："mobile_network_settings"
private static final String KEY_MOBILE_NETWORK_SETTINGS = "mobile_network_settings";
把 network_settings_title赋值给 KEY_MOBILE_NETWORK_SETTINGS，再跟进一下 KEY_MOBILE_NETWORK_SETTINGS这个变量吧。
在相同的文件中我们找到：
RemovMobile Network Settings if it's a wifi-only device.
if (Utils.isWifiOnly(getActivity())) {
getPreferenceScreen().removePreference(findPreference(KEY_MOBILE_NETWORK_SETTINGS));
}
getSystemService(Context.CONNECTIVITY_SERVICE);获得网络连接服务，然后判断是否支持TYPE_MOBILE，现在判断应该是不支持，也就是if判断中：Utils.isWifiOnly(getActivity())=1
所以把“移动网络”的选项移除，现在我们就重点去分析Utils.isWifiOnly(getActivity())，找到不显示的原因，也就是if()中的判断条件，跟进这段代码
3、我们去看下ifWifiOnly()是何方神圣？
packages/apps/Settings/src/com/android/settings/Utils.Java中找到
.import android.net.ConnectivityManager;
.public static boolean isWifiOnly(Context context) {
ConnectivityManager cm = (ConnectivityManager)context.getSystemService(
Context.CONNECTIVITY_SERVICE);
return (cm.isNetworkSupported(ConnectivityManager.TYPE_MOBILE) == false);
.}
Utils.isWifiOnly(getActivity())=1也就是
cm.isNetworkSupported(ConnectivityManager.TYPE_MOBILE) = false,可是我们现在要的值是true,为什么会出现false呢，我们继续往下看cm.isNetworkSupported
4、 再分析isNetworkSupported
frameworks/base/core/java/android/net/ ConnectivityManager.java
.public boolean isNetworkSupported(int networkType) {
.try {
.return mService.isNetworkSupported(networkType);
.} catch (RemoteException e) {}
.return false;
.}
07.}
继续跟进 mService.isNetworkSupported这个函数的实现
5、 mService.isNetworkSupported的实现
\frameworks\base\core\java\android\net
public boolean isNetworkSupported(int networkType) {
try {
return mService.isNetworkSupported(networkType);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
6、到最后是device\rockchip\common\overlay\frameworks\base\core\res\res\values\config.xml
<!-- the 6th element indicates boot-time dependency-met value. -->
<string-array translatable="false" name="networkAttributes">
<item>"wifi,1,1,2,-1,true"</item>
<item>"mobile,0,0,0,-1,true"</item>
<item>"mobile_mms,2,0,2,60000,true"</item>
<item>"mobile_supl,3,0,2,60000,true"</item>
<item>"mobile_dun,4,0,2,60000,true"</item>
<item>"mobile_hipri,5,0,3,60000,true"</item>
<item>"mobile_fota,10,0,2,60000,true"</item>
<item>"mobile_ims,11,0,2,60000,true"</item>
<item>"mobile_cbs,12,0,2,60000,true"</item>
<item>"bluetooth,7,7,0,-1,true"</item>
<item>"ethernet,9,9,9,-1,true"</item> 要注意这里
</string-array>
<!-- This string array should be overridden by the device to present a list of radio
attributes. This is used by the connectivity manager to decide which networks can coexist
based on the hardware -->
<!-- An Array of "[ConnectivityManager connectionType],
[# simultaneous connection types]" -->
<string-array translatable="false" name="radioAttributes">
<item>"0,1"</item>
<item>"1,1"</item>
<item>"7,1"</item>
<item>"9,1"</item> 注意这里
</string-array>
7、最好要开启rild相关的资源，这是4G模块就可以加载成功。
在boardconfig.mk文件增加此功能
BOARD_HAVE_DONGLE:=true
在android7.1可以成功利用4G模块上网
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