我的应用使用导航抽屉，并在从抽屉中选择一行时将新片段加载到我的活动中。它工作正常，但抽屉关闭动画有很大的滞后和口吃。我该怎么做才能消除滞后？
public class MainActivity extends BaseActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
public static MenuItem menuItem;
public static MenuItem marketListItem;
public static MenuItem mapItem;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
private TypedArray navMenuIcons;
private ArrayList<NavDrawerItem> navDrawerItems;
private NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ActionBar bar = getActionBar();
bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#0E4D8B")));
mTitle = mDrawerTitle = getTitle();
// load slide menu items
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
navMenuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
mDrawerList = (ListView)findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[7], navMenuIcons.getResourceId(7, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[8], navMenuIcons.getResourceId(8, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[9], navMenuIcons.getResourceId(9, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[10], navMenuIcons.getResourceId(10, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[11], navMenuIcons.getResourceId(11, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[12], navMenuIcons.getResourceId(12, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[13], navMenuIcons.getResourceId(13, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[14], navMenuIcons.getResourceId(14, -1)));
// recycle the typed array
navMenuIcons.recycle();
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(), navDrawerItems);
mDrawerList.setAdapter(adapter);
// enabling action bar app icon and set it as toggle button
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.drawable.ic_drawer,
R.string.app_name, R.string.app_name) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if(savedInstanceState == null) {
// on first time display view for first nav item
displayView(0);
}
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
}
/**
* Slide menu item click listener
*/
private class SlideMenuClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// display view for selected nav drawer item
displayView(position);
}
}
/**
* Displaying fragment view for selected nav drawer list item
*/
private void displayView(int position) {
// update the main content by replacing fragments
Fragment fragment = null;
switch (position) {
case 0:
// Action Alerts
fragment = new ActionAlertsFragment();
break;
case 1:
// Ag News
fragment = new AgNewsFragment();
break;
case 2:
// Market Updates
fragment = new MarketUpdatesFragment();
break;
case 3:
// Tours & Conferences
fragment = new ToursFragment();
break;
case 4:
// KFB Magazine
fragment = new KFBMagFragment();
break;
case 5:
// Member Benefits
fragment = new BenefitsFragment();
break;
case 6:
// Ag Facts
fragment = new AgFactsFragment();
break;
case 7:
// Farm Markets
fragment = new RSFMFragment();
break;
case 8:
// Weather
fragment = new WeatherLocationFragment();
break;
case 9:
// Annual Meeting
fragment = new AnnualMeetingFragment();
break;
case 10:
// Media
fragment = new MediaFragment();
break;
case 11:
// My KYFB
fragment = new MyKYFB();
break;
case 12:
// About KYFB
break;
case 13:
// Contact Info
break;
case 14:
// Preferences
break;
default:
break;
}
if(fragment != null) {
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.frame_container, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
mDrawerList.setSelection(position);
setTitle(navMenuTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
else {
// error in creating fragment
Log.e("MainActivity", "Error in creating fragment");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
menuItem = (MenuItem)menu.findItem(R.id.action_settings);
marketListItem = (MenuItem)menu.findItem(R.id.marketList);
mapItem = (MenuItem)menu.findItem(R.id.map);
menuItem.setVisible(false);
marketListItem.setVisible(false);
mapItem.setVisible(false);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// toggle nav drawer on selecting action bar app icon/title
if(mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// handle action bar actions click
switch(item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/***
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// sync the toggle state after onRestoreInstanceState has occurred
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// pass any configuration changes to the drawer toggle
mDrawerToggle.onConfigurationChanged(newConfig);
}
答案 0 :(得分：6)
你的片段很可能在onCreate（）上做了很多工作。
但是，一般情况下，你应该在启动片段之前使用延迟的runnable，延迟时间为〜250ms，以便抽出时间关闭。
// launch the target Activity after a short delay, to allow the close animation to play
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
goToNavDrawerItem(itemId);
}
}, NAVDRAWER_LAUNCH_DELAY);
mDrawerLayout.closeDrawer(Gravity.START);
您可以在Github上的Google IO应用代码中更详细地找到该示例： Google IO 2014 code
答案 1 :(得分：3)
您可以在您作为NavigationDrawer的DrawerListener附加的onDrawerClosed()的{{1}}回调中执行操作。
然后，您不必在应用中对延迟进行硬编码。毕竟，不能保证抽屉关闭动画的动画时间保持不变。
答案 2 :(得分：0)
请查看我在此描述的解决方案：
https://stackoverflow.com/a/29133407/928956
在我自己的解决方案中，我利用了
mDrawerLayout.setDrawerListener()
方法