This is my gif of problem。我正在使用导航抽屉，我已按照下面的说法完成了一些代码，但窗格关闭和打开时无法使用平滑度。
这是我的代码：
public class SettingFlyout extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
SharedPreferences pref;
SharedPreferences.Editor editor;
public DrawerLayout drawer;
public ActionBarDrawerToggle toggle;
public NavigationView navigationView;
LinearLayout viewPager;
int roleId;
FragmentStack fragmentStack = FragmentStack.getInstance();
@Override
public void onPanelClosed(int featureId, Menu menu) {
super.onPanelClosed(featureId, menu);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_setting_flyout);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
TextView credits, num_credits, ttlscore, num_ttlscore, tutorNow;
final Typeface typeface = Typeface.createFromAsset(getAssets(), "fonts/GothamBookRegular.ttf");
View v = getLayoutInflater().inflate(R.layout.student_actionbar_view, null);
credits = (TextView) v.findViewById(R.id.credits);
credits.setTypeface(typeface);
viewPager = (LinearLayout) findViewById(R.id.viewpager);
Intent i = getIntent();
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
int status = i.getIntExtra("status", 1);
String username = i.getStringExtra("username");
navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
navigationView.setItemIconTintList(null);
View view = navigationView.getHeaderView(0);
TextView TVuserName = (TextView) view.findViewById(R.id.personTextsettingflyout);
TVuserName.setText(username);
if (status == 0) {
roleId = Integer.parseInt(i.getStringExtra("roleId"));
}
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
Tablayout_with_viewpager withViewpager = new Tablayout_with_viewpager(status, roleId);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.addToBackStack(null);
fragmentTransaction.replace(R.id.viewpager, withViewpager);
fragmentTransaction.commit();
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
FragmentManager fragmentManager = getSupportFragmentManager();
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else
if (fragmentStack.size()==0) {
super.onBackPressed();
finish();
moveTaskToBack(true);
} else if (fragmentStack.size()>0) {
if (fragmentStack.size()<2 || fragmentStack.size()==2 || fragmentStack.isEmpty()){
super.onBackPressed();
finish();
moveTaskToBack(true);
SplashScreen splashScreen=new SplashScreen();
splashScreen.onBackPressed();
} else {
Fragment fragment = fragmentStack.pop();
if (fragment.getClass().equals(""))
Toast.makeText(getApplicationContext(), fragment.getClass().toString(), Toast.LENGTH_SHORT).show();
Toast.makeText(getApplicationContext(), String.valueOf(fragmentStack.size()), Toast.LENGTH_SHORT).show();
FragmentTransaction ft = fragmentManager.beginTransaction();
ft.replace(R.id.viewpager, fragment).commit();
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment fragment;
if (id == R.id.profile) {
Tablayout_with_viewpager tablayout_with_viewpager = new Tablayout_with_viewpager();
fragmentTransaction.replace(R.id.viewpager, tablayout_with_viewpager).commit();
// Handle the camera action
} else if (id == R.id.desired_tutor) {
DesiredTutor desiredTutor = new DesiredTutor();
fragmentTransaction.replace(R.id.viewpager, desiredTutor).commit();
} else if (id == R.id.payment_options) {
BuyCredits buyCredits=new BuyCredits();
fragmentTransaction.replace(R.id.viewpager, buyCredits).commit();
} else if (id == R.id.lesson_tracking) {
lessonTracking lessonTracking=new lessonTracking();
fragmentTransaction.replace(R.id.viewpager, lessonTracking).commit();
} else if (id == R.id.TTL_Score) {
TTL_Score ttl_score = new TTL_Score();
fragmentTransaction.replace(R.id.viewpager, ttl_score).commit();
} else if (id == R.id.History) {
History history = new History();
fragmentTransaction.replace(R.id.viewpager, history).commit();
} else if (id == R.id.notification) {
Notification notification = new Notification();
fragmentTransaction.replace(R.id.viewpager, notification).commit();
} else if (id == R.id.support) {
Support support = new Support();
fragmentTransaction.replace(R.id.viewpager, support).commit();
} else if (id == R.id.sign_out) {
pref=getSharedPreferences("loginStatus", Context.MODE_PRIVATE);
editor=pref.edit();
editor.clear();
editor.apply();
Intent i = new Intent(getApplicationContext(), Login.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
finish();
}
else if (id== R.id.daily_game){
TutorGuides dailyGame= new TutorGuides();
fragmentTransaction.replace(R.id.viewpager, dailyGame).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
我该怎么做才能让它更顺畅？
答案 0 :(得分：0)
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
你每次都在发起它。这是不对的。只需初始化一次，然后使用该对象打开和关闭抽屉。从项目选定的侦听器中删除该代码并将其放入Oncreate以初始化它。
使用以下代码使其完美：
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
toggle.syncState();
}
ActionBarDrawerToggle toggle;
toggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close) {
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
invalidateOptionsMenu();
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(toggle);
答案 1 :(得分：0)
每次使用此代码时，每次定义时都不需要使用此代码： -
fragmentTransaction.replace(R.id.viewpager, desiredTutor).commit();
创建方法： -
public static void showFragment(Fragment fragment, String Tag) {
FragmentManager manager = activity.getSupportFragmentManager();
FragmentTransaction transcation = manager.beginTransaction();
transcation.replace(R.id.viewpager, fragment, Tag);
transcation.addToBackStack(Tag);
transcation.commit();
}
并使用它： -
switch (item.getItemId())
{
case R.id.desired_tutor:
showFragment(new DesiredTutor(), "");
break;
case R.id.payment_options:
showFragment(new BuyCredits(), "");
break;
}