Question

我正在为我的应用实现底部标签，当我在标签之间切换时，标签指示器会滞后（缓慢加载）。我正在使用tablayout定位底部。在这种情况下，我会在每个选项卡上单击以加载四个片段，即您的一天，您的时间，panganga和kundali。加载片段时，每次延迟大约1秒

public class MainPage extends MyActivity {
private static final int LOC_PER = 201;
YourDay yourDay;
YourTime yourTime;
Panchang panchang;
Kundali kundali;
Advice advice;
FrameLayout dummy;
TabLayout tabs;
private static MainPage inst;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    adjustFontScale(getResources().getConfiguration());
    setContentView(R.layout.main_page);
    dummy = findViewById(R.id.mp_dummy);
    yourDay = new YourDay();
    tabs = findViewById(R.id.mp_tabs);
    tabs.setTabIndicatorFullWidth(false);
    tabs.addTab(tabs.newTab().setText(getResources().
    getString(R.string.yday)).setIcon(R.drawable.your_day_w));
    tabs.addTab(tabs.newTab().setText(getResources().
    getString(R.string.ytime)).setIcon(R.drawable.your_time_w));
    tabs.addTab(tabs.newTab().setText(getResources().
    getString(R.string.panchang)).setIcon(R.drawable.panchang_w));
    tabs.addTab(tabs.newTab().setText(getResources().
    getString(R.string.kundali)).setIcon(R.drawable.kundali_w));
    getLocationPermission();
    setCurrentTab(tabs.getTabAt(0));
    tabs.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            setCurrentTab(tab);
        }
        @Override
        public void onTabUnselected(TabLayout.Tab tab) {
            tab.getIcon().
   setColorFilter(ContextCompat.getColor(getApplicationContext(), 
   R.color.white),
                    PorterDuff.Mode.SRC_IN);
        }
        @Override
        public void onTabReselected(TabLayout.Tab tab) { }
    });
}

public void showAdvice(){
        advice = new Advice(MainPage.this, 
 android.R.style.Theme_Light_NoTitleBar);
    advice.show();
}
public void goToProfiles(){
    startActivity(new Intent(getApplicationContext(), 
 SwitchProfile.class));
}
public void setDates(TextView d, TextView my){
    Calendar calendar = Calendar.getInstance();
    SimpleDateFormat dayFormat = new SimpleDateFormat("EEEE", 
Locale.getDefault());
    SimpleDateFormat monthFormat = new SimpleDateFormat("MMM", 
 Locale.getDefault());
    final String today = dayFormat.format(calendar.getTime());
    d.setText(String.valueOf(calendar.get(Calendar.DAY_OF_MONTH)));
    String t = today + "\n"
            + monthFormat.format(calendar.getTime()) + ", " + 
      String.valueOf(calendar.get(Calendar.YEAR));
    my.setText(t);
}

private void setCurrentTab(TabLayout.Tab tab) {
    tab.getIcon().
 setColorFilter(ContextCompat.getColor(getApplicationContext(), 
 R.color.black),
            PorterDuff.Mode.SRC_IN);
    switch (tab.getPosition()) {
        case 0:
            setFrag(yourDay);
            break;
        case 1:
            if(yourTime == null){
                yourTime = new YourTime();
            }
            setFrag(yourTime);
            break;
        case 2:
            if(panchang == null){
                panchang = new Panchang();
            }
            setFrag(panchang);
            break;
        case 3:
            if(kundali == null){
                kundali = new Kundali();
            }
            setFrag(kundali);
            break;
    }
}
void setFrag(Fragment fragment) {

    getSupportFragmentManager().beginTransaction()
            .replace(R.id.mp_dummy, fragment)
            .commit();
}
@Override
public void onBackPressed() {
    moveTaskToBack(true);
}

void getLocationPermission() {
    if (ActivityCompat.checkSelfPermission(getApplicationContext(), 
   Manifest.permission.ACCESS_FINE_LOCATION) != 
 PackageManager.PERMISSION_GRANTED &&
            ActivityCompat.checkSelfPermission(getApplicationContext(), 
  Manifest.permission.ACCESS_COARSE_LOCATION) != 
  PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(MainPage.this, new String[] 
  {Manifest.permission.ACCESS_COARSE_LOCATION,
                Manifest.permission.ACCESS_FINE_LOCATION}, LOC_PER);
    }}
public static MainPage instance() {
    return inst;
}
}

Answer 1

结结巴结是由于每次切换选项卡时都要更换碎片。

考虑将ViewPager与TabLayout结合使用视图分页器可以在内存中保留多个片段，因此您可以在它们之间切换而无需加载/卸载片段。

有关如何完成此操作的好例子： https://medium.com/@Abdulkadir98/android-sliding-tabs-with-viewpager-851f9c996cb5

切换制表符时，制表符指示器加载缓慢

1 个答案: