获取小米双卡双待手机默认上网卡槽的方法

1. 反编译小米的TeleService.apk，查看smali代码得知有一个getPreferredDataSlotId方法，相关代码：

invoke-static {}, Lmiui/telephony/MultiSimManager;->getInstance()Lmiui/telephony/MultiSimManager;

move-result-object v1

invoke-virtual {v1}, Lmiui/telephony/MultiSimManager;->getPreferredDataSlotId()I;

2. 使用java反射方法调用：

try {Class<?> clazz = Class.forName("miui.telephony.MultiSimManager");Method method = clazz.getDeclaredMethod("getInstance");Object obj = (Object) method.invoke(null);Method method2 = clazz.getDeclaredMethod("getPreferredDataSlotId");Integer val = (Integer) method2.invoke(obj);Log.e("pmtoam", "[sam] val = " + val);} catch (Exception e) {e.printStackTrace();}

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