导航抽屉关闭时抽搐

Question

我尝试在我的应用中实现导航抽屉（材料设计）。我的活动包含带有片段的 FrameLayout。当用户在 Navigation Drawer FrameLayout 中选择项目时重新加载新片段：

    listViewDrawer.setOnItemClickListener( new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick( AdapterView<?> parent, View view, int position, long id) {

            drawerLayout.closeDrawer( listViewDrawer); // <<<-------

            toolbar.setTitle( getResources().getString( R.string.title));

            fragmentMain = new FragmentMain();

            android.app.FragmentManager fragmentManager = getFragmentManager();
            fragmentManager.beginTransaction()
                       .replace( R.id.frameLayoutMain, ApplicationTapaKiosk.getInstance().fragmentMain)
                       .commit();

        }
     }

当我单击项目时，一切正常。导航抽屉关闭不顺畅，但由于片段在后台重新加载而冻结（抽搐、抽搐）。

如何顺利关闭导航抽屉？

Answer 1

你必须决定你是否喜欢更多：

将Fragment 替换为FrameLayout，然后关闭DrawerLayout

或

关闭DrawerLayout，然后替换您的Fragment。

实施第一种方法：

只需在您的代码中进行这些更改：

listViewDrawer.setOnItemClickListener(new AdapterView.OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        toolbar.setTitle(getResources().getString(R.string.title));

        fragmentMain = new FragmentMain();

        android.app.FragmentManager fragmentManager = getFragmentManager();
        fragmentManager.beginTransaction()
                   .replace(R.id.frameLayoutMain, ApplicationTapaKiosk.getInstance().fragmentMain)
                   .commit();

        fragmentManager.executePendingTransactions(); // wait for the transaction to finish
        drawerLayout.closeDrawer(listViewDrawer); // call closeDrawer(...) as a last thing
    }
 }

实现第二种方法：

当用户点击时设置某种标志：

listViewDrawer.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        mDrawerItemClicked = true;
        drawerLayout.closeDrawer(listViewDrawer); 
    }
 }

并在您的DrawerLayout 上设置DrawerLayout.DrawerListener，如下所示：

drawerLayout.setDrawerListener(new DrawerLayout.DrawerListener() {
    @Override
    public void onDrawerSlide(View drawerView, float slideOffset) {
    }

    @Override
    public void onDrawerOpened(View drawerView) {
    }

    @Override
    public void onDrawerClosed(View drawerView) {
        if (mDrawerItemClicked){
            mDrawerItemClicked = false;

            toolbar.setTitle(getResources().getString(R.string.title));
            fragmentMain = new FragmentMain();
            android.app.FragmentManager fragmentManager = getFragmentManager();
            fragmentManager.beginTransaction()
                   .replace(R.id.frameLayoutMain, ApplicationTapaKiosk.getInstance().fragmentMain)
                   .commit();
        }
    }

    @Override
    public void onDrawerStateChanged(int newState) {
    }
});

Answer 2

抽屉关闭大约需要 200 毫秒。所以你可以这样做：

Handler mHandler = new Handler();

drawerLayout.closeDrawer( listViewDrawer);
mHandler.postDelayed(
                new Runnable() {
                    @Override
                    public void run () {
                        loadFragment();
                    }
                }
                , NAVDRAWER_CLOSE_DELAY // 250...for delay
        );