MTK双卡双待手机下切换不同SIM卡上网

setDefaultDataSub(1);
try {
    setDataEnabled(1, true, this);
} catch (Exception e) {
    e.printStackTrace();
}

核心代码：

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP_MR1)
public void setDataEnabled(int slotIdx, boolean enable, Context context) throws Exception
{
    try {
        int subid = SubscriptionManager.from(context).getActiveSubscriptionInfoForSimSlotIndex(slotIdx).getSubscriptionId();
        TelephonyManager telephonyService = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        Method setDataEnabled = telephonyService.getClass().getDeclaredMethod("setDataEnabled", int.class, boolean.class);
        if (null != setDataEnabled) {
            setDataEnabled.invoke(telephonyService, subid, enable);
            Log.i(TAG,"setDataEnabled OK");
        }
    }catch (Exception e)
    {
        e.printStackTrace();
        Log.i(TAG,"setDataEnabled error");
    }
}

@TargetApi(Build.VERSION_CODES.LOLLIPOP_MR1)
public void setDefaultDataSub(int slotindex)
{
    SubscriptionManager sm = SubscriptionManager.from(this);
    int subId = sm.getActiveSubscriptionInfoForSimSlotIndex(slotindex).getSubscriptionId();
    try {
        Method method = sm.getClass().getMethod("setDefaultDataSubId",int.class);
        if(method != null)
        {
            method.invoke(sm, subId);
        }
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }
}

上面的代码，需要系统权限才可以支持：

1. Manifest中增加请求系统账户权限：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.demo.abc" android:sharedUserId="android.uid.system">
2. 增加请求权限：
<uses-permission android:name="android.permission.MODIFY_PHONE_STATE"></uses-permission>
3. 使用系统证书签名。