从淘宝广告SDK看Instrumentation注入

2015年11月28日

用途

监听Activity的创建，生命周期等
淘宝广告sdk：http://mu.tanx.com/m/sdk/doc.htm?type=mu&platform=android

初始化代码

下面是淘宝广告的初始化代码

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private void setupAlimama(ViewGroup nat, String slotId) {
    MmuSDK mmuSDK = MmuSDKFactory.getMmuSDK();
    mmuSDK.init(getApplication());//初始化SDK,该方法必须保证在集成代码前调用，可移到程序入口处调用
    properties = new BannerProperties(slotId, nat);
    mController = (BannerController) properties.getMmuController();
    mmuSDK.attach(properties);
}

MmuSDKFactory.getMmuSDK();// 获得单例的实例 mmuSDK.init(getApplication());// 同步初始化（initAsync 异步初始化） GodModeHacks.inject(application.getBaseContext());

// 设置Instrumentation Instrumentation instrumentation = (Instrumentation)ActivityThread_mInstrumentation.on(activityThread).get(); InstrumentationHook instrumentationHook = new InstrumentationHook(instrumentation, context); ActivityThread_mInstrumentation.on(activityThread).set(instrumentationHook);

原理

原理很简单，反射设置ActivityThread的mInstrumentation即可。

示例

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public static void inject() {
    try {
        Class<?> ActivityThread = Class.forName("android.app.ActivityThread");
        Object sCurrentActivityThreadObj;
        if (Build.VERSION.SDK_INT < 11) {
            Method currentActivityThread = ActivityThread.getDeclaredMethod("currentActivityThread", null);
            currentActivityThread.setAccessible(true);
            sCurrentActivityThreadObj = currentActivityThread.invoke(null);
        } else {
            Field sCurrentActivityThread = ActivityThread.getDeclaredField("sCurrentActivityThread");
            sCurrentActivityThread.setAccessible(true);
            sCurrentActivityThreadObj = sCurrentActivityThread.get(null);
        }
        Field mInstrumentation = ActivityThread.getDeclaredField("mInstrumentation");
        mInstrumentation.setAccessible(true);
        mInstrumentation.set(sCurrentActivityThreadObj, new InstrumentationHook());
        Log.d("SS", "BaseApplication.injectInstrumentation: ok");
    } catch (Throwable e) {
        e.printStackTrace();
        Log.d("SS", "BaseApplication.injectInstrumentation: exception = " + Log.getStackTraceString(e));
    }
}
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