需求場(chǎng)景舉例：
當(dāng)我們項(xiàng)目中使用了第三方組件的頁面蚓聘，而組件現(xiàn)有的頁面又不能滿足我們項(xiàng)目的設(shè)計(jì)需求缅糟，此時(shí)你該如何做呢魔吐？
向組件開發(fā)方提需求，讓他滿足自己一次综慎？
如果組件是自家人開發(fā)的或許還可以涣仿，那要是其他團(tuán)隊(duì)或者公司的開發(fā)的呢，人家會(huì)鳥你嗎示惊？
很顯然好港，一個(gè)簡(jiǎn)單而特殊的需求，組件開發(fā)者不一定會(huì)給你做改動(dòng)涝涤，那么該怎么辦呢媚狰？
那只有我們自己改嘍！
一些思考：
如何修改ui呢阔拳？

1. 修改布局文件
2. java代碼中動(dòng)態(tài)修改

好像1不太現(xiàn)實(shí)直接修改aar里面布局文件崭孤，那剩下的就是在java代碼中動(dòng)態(tài)修改嘍类嗤。
如何修改？
關(guān)鍵是拿到Actvity或Fragment實(shí)例辨宠，進(jìn)而獲取想要?jiǎng)討B(tài)進(jìn)行修改的視圖實(shí)例（若要添加視圖元素需要獲取到父視圖實(shí)例）遗锣。
改如何做呢？
ActivityLifecycleCallbacks用于監(jiān)聽整個(gè)應(yīng)用的Activity生命周期變化的接口嗤形，接口聲明如下：

   public interface ActivityLifecycleCallbacks {
        void onActivityCreated(Activity var1, Bundle var2);

        void onActivityStarted(Activity var1);

        void onActivityResumed(Activity var1);

        void onActivityPaused(Activity var1);

        void onActivityStopped(Activity var1);

        void onActivitySaveInstanceState(Activity var1, Bundle var2);

        void onActivityDestroyed(Activity var1);
    }

從接口生命可以發(fā)現(xiàn)精偿，所有的抽象方法對(duì)應(yīng)Activity的生命周期方法，在Activity每個(gè)生命周期階段都會(huì)回調(diào)接口實(shí)現(xiàn)當(dāng)中相應(yīng)的方法赋兵。還可以發(fā)現(xiàn)每個(gè)方法的參數(shù)都要Activity笔咽，沒錯(cuò)，這個(gè)Activity就是生命周期正在發(fā)生變化的那個(gè)霹期，這樣我們就可以通過這個(gè)Activity引用叶组，就可以拿到他的View視圖和Fragement實(shí)例等等，我們需要的對(duì)象引用历造，進(jìn)而進(jìn)行動(dòng)態(tài)修改甩十。

具體實(shí)踐舉例

這里的例子是向其他組件的頁面中添加兩個(gè)視圖元素，并響應(yīng)點(diǎn)擊事件吭产。

實(shí)現(xiàn)監(jiān)聽接口

public class BeiKaoActivityLefecycleCallback implements Application.ActivityLifecycleCallbacks {
    private IConsultEntryController mController;
    private final String CURRENT_ACTIVITY_NAME = "com.nd.module_im.im.activity.ChatActivity";

    public BeiKaoActivityLefecycleCallback(Activity activity) {
        mController = new ConsultEntryControllerImpl(activity);
    }
    @Override
    public void onActivityCreated(Activity activity, Bundle bundle) {

    }

    @Override
    public void onActivityStarted(Activity activity) {

    }

    @Override
    public void onActivityResumed(Activity activity) {
        Log.d(activity.getClass().getSimpleName(), "onActivityResumed");
        String canonicalName = activity.getClass().getCanonicalName();
        if(CURRENT_ACTIVITY_NAME.equals(canonicalName)){
            mController.showFloatEntry(activity);
        }


    }

    @Override
    public void onActivityPaused(Activity activity) {

    }

    @Override
    public void onActivityStopped(Activity activity) {
        Log.d(activity.getClass().getSimpleName(), "onActivityStopped");
        String canonicalName = activity.getClass().getCanonicalName();
        if(CURRENT_ACTIVITY_NAME.equals(canonicalName)){
            mController.hideFloatEntry(activity);
        }
    }

    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {

    }

    @Override
    public void onActivityDestroyed(Activity activity) {

    }
}

添加生命周期監(jiān)聽

context.registerActivityLifecycleCallbacks(new BeiKaoActivityLefecycleCallback(getActivity()));

獲取視圖元素并動(dòng)態(tài)修改視圖

ublic class ConsultEntryControllerImpl implements IConsultEntryController, View.OnClickListener {
    private TextView floatView = null;
    private LinearLayout mLinearLayout;

    public ConsultEntryControllerImpl(Activity activity) {
        initFloatView(activity);
    }

    protected void initFloatView(Activity activity) {
        floatView = new TextView(activity);
        floatView.setBackgroundResource(R.drawable.bg_primary_color_selector);
        floatView.setTextColor(AppContextUtil.getColor(R.color.white));
        floatView.setTextSize(TypedValue.COMPLEX_UNIT_SP,16);
        floatView.setText("人工客服");
        floatView.setGravity(Gravity.CENTER);
        floatView.setPadding(MixedUtils.dpToPx(activity,8),0,MixedUtils.dpToPx(activity,8),0);
        floatView.setOnClickListener(this);
        mLinearLayout = (LinearLayout) LayoutInflater.from(activity).inflate(R.layout.layout_consult_entry,null);
        mLinearLayout.setOnClickListener(this);
    }

    @Override
    public void showFloatEntry(final Activity activity) {
        Fragment fragment = ((AppCompatActivity) activity).getSupportFragmentManager().findFragmentByTag("chat");
        if(!fragment.getClass().getCanonicalName().equals("com.nd.module_im.psp.ui.activity.ChatFragment_Psp")){
            return;
        }
        RelativeLayout parent = (RelativeLayout) floatView.getParent();
        if(parent != null){
            return;
        }
        RelativeLayout frameLayout = (RelativeLayout) fragment.getView();
        RelativeLayout.LayoutParams topBtnParam = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,  MixedUtils.dpToPx(activity,56));
        topBtnParam.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
        RelativeLayout.LayoutParams linnearLayoutParam = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, MixedUtils.dpToPx(activity,28));
        linnearLayoutParam.topMargin = MixedUtils.dpToPx(activity,56);
        frameLayout.addView(floatView, topBtnParam);
        frameLayout.addView(mLinearLayout,linnearLayoutParam);
        Log.d("ConsultEntryControllerI", "顯示人工咨詢?nèi)肟趫D標(biāo)");
    }

    @Override
    public void hideFloatEntry(Activity activity) {
        RelativeLayout parent = (RelativeLayout) floatView.getParent();
        if(parent == null){
            return;
        }
        parent.removeView(floatView);
        parent.removeView(mLinearLayout);
    }

    @Override
    public void onClick(View view) {
        CounselChatUtils.toXNCounselChat(AppContextUtil.getContext());
    }
}