缓慢加载布局

Question

我有一个超级课程,在图书馆里.这个库负责初始化一些基本的布局组件和其他东西.我的问题是,在设置子指定布局之前,加载布局需要1.x秒,并显示默认布局一段时间.

这是我的超级类的方法:

public void InitializeWindow(Activity act, int layoutResourceId, String windowTitle,
        Object menuAdapter, int slideMenuMode) {
    super.setContentView(layoutResourceId);
    super.setBehindContentView(R.layout.menu_frame);
    this.menuAdapter = menuAdapter; 
    this.slideMenuMode = slideMenuMode;
    setWindowTitle(windowTitle);
    initializeSlidingMenu();
}

这是这样称呼的:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    super.InitializeWindow(this, R.layout.activity_home, "\t\tHome",
            new MenuAdapter(this, R.menu.slide_menu), SlidingMenu.TOUCHMODE_FULLSCREEN);    
}

该应用程序就像一个魅力,但它需要,因为我说1.x秒加载从子类传递的布局.为什么会这样？

根据要求,这是我的initializeSlideMenu()方法:

public void initializeSlidingMenu() {
    this.setSlidingActionBarEnabled(true);
    getSlidingMenu().setBehindOffsetRes(R.dimen.actionbar_home_width);
    getSlidingMenu().setShadowWidthRes(R.dimen.shadow_width);
    getSlidingMenu().setShadowDrawable(R.drawable.shadow);
    getSlidingMenu().setTouchModeAbove(slideMenuMode);
    getSlidingMenu().setBehindScrollScale(0.25f);

    ListView v = new ListView(this);
    v.setBackgroundColor(Color.parseColor("#000000"));
    v.setAdapter((ListAdapter) menuAdapter);
    getSlidingMenu().setMenu(v);
}

Answer 1

我怀疑你的麻烦点在于：

 v.setAdapter((ListAdapter) menuAdapter);

您应该将其作为AsyncTask. 适配器执行加载通常会非常慢。

以下是示例 AsyncTask 实现的片段：

//before starting the load, I pop up some indicators that I'm doing some loading
progressBar.setVisibility(View.VISIBLE);
loadingText.setVisibility(View.INVISIBLE);

AsyncTask<Void, Void, Void> loadingTask = new AsyncTask<Void, Void, Void>() {
        private ArrayList<Thing> thingArray;

        @Override
        protected Void doInBackground(Void... params) {
            //this is a slow sql fetch and calculate for me
            thingArray = MyUtility.fetchThings(inputValue);
            return null;
        }

        @Override
        public void onPostExecute(Void arg0) {
            EfficientAdapter myAdapter = new EfficientAdapter(MyActivity.this, thingArray);
            listView.setAdapter(myAdapter);
            //after setting up my adapter, I turn off my loading indicators
            progressBar.setVisibility(View.INVISIBLE);
            loadingText.setVisibility(View.INVISIBLE);
            RelativeLayout layout = (RelativeLayout)MyActivity.this.findViewById(R.id.spacey);
            if (layout != null) {
                LayoutInflater inflater = LayoutInflater.from(MyActivity.this);
                View view = inflater.inflate(R.layout.name_tabled_sub, layout);
                NamedTableView tableView = new NamedTableView(MyActivity.this, view);
            }
            progressBar.setVisibility(View.INVISIBLE);
            loadingText.setVisibility(View.INVISIBLE);


        }
    };
    loadingTask.execute();

您还可以使用异步任务执行“预执行”项目以及更新。