java - 抽屉导航在关闭时抽动

Question

我尝试在我的应用中实现抽屉导航(Material Design)。我的 Activity 包含带有 fragment 的 FrameLayout。当用户在 Navigation Drawer FrameLayout 中选择项目时重新加载新 fragment :

    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();

        }
     }

当我点击项目时一切正常。 Navigation Drawer 关闭不顺利，但卡住(抽搐、抽搐)，因为 fragment 在后台重新加载。

如何顺利关闭Navigation Drawer？

Answer 1

你必须决定你是否更喜欢:

替换 FrameLayout 中的 Fragment，然后关闭 DrawerLayout

或

关闭 DrawerLayout，然后替换您的 Fragment。

实现第一种方法:

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:

在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) {
    }
});