我遇到的问题是，每当我在不同标签之间切换时，该过程都会滞后一两秒。我怎样才能消除这种滞后？碎片的oncreate功能中没有这样的东西。我在这里发布代码。
这是调用片段Dashboardnew的活动的代码：
private void setupDrawerContent(final NavigationView navigationView) {
//revision: this don't works, use setOnChildClickListener() and setOnGroupClickListener() above instead
expandableList.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView expandableListView, View view, int i, long l) {
if(i==0) {
//Toast.makeText(getApplicationContext(),"View Tasks",Toast.LENGTH_LONG).show();
fab.setVisibility(View.VISIBLE);
if (filterApplied) {
persistentbottomSheet.setVisibility(View.VISIBLE);
persistentbottomSheet.bringToFront();
fab.bringToFront();
}
fragment = new DashboardNew();
if (fragment != null) {
manager.beginTransaction().replace(R.id.dashboard_frame, fragment).commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
}
/* new Handler().postDelayed(new Runnable() {
@Override
public void run() {
if (fragment != null) {
manager.beginTransaction()
.replace(R.id.dashboard_frame, fragment)
.commit();
}
}
}, 300);*/
//drawer.closeDrawer(GravityCompat.START);
}
if(i==1) {
}
if(i==2) {
prefs.edit().remove("firstTime").apply();
Intent intent = new Intent(getApplication(), Login.class)
.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
finish();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
return false;
}
});
expandableList.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView expandableListView, View view, int groupPosition, int childPosition, long l) {
if (groupPosition == 1 && childPosition == 0) {
fabvisibility = false;
//so this code only executes if the 2nd child in the 2nd group is clicked
fragment=new AddUser();
if (fragment != null) {
manager.beginTransaction()
.replace(R.id.dashboard_frame, fragment,"AddUser")
//.add(fragment,"AddUser")
// .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
.commit();
}
drawer.closeDrawer(GravityCompat.START);
}
if (groupPosition == 1 && childPosition == 1) {
//so this code only executes if the 2nd child in the 2nd group is clicked
fabvisibility = false;
fragment=new ViewUsers();
if (fragment != null) {
manager.beginTransaction()
.replace(R.id.dashboard_frame, fragment)
.commit();
drawer.closeDrawer(GravityCompat.START);
}
}
return false;
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
switch (item.getItemId()) {
case android.R.id.home:
drawer.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
}
Dashboardnew片段的代码是：
initialize(rootview);
clicklisteners();
createViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
createTabIcons();
return rootview;
}
private void clicklisteners()
{
usualTasks.setOnClickListener(this);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
//you can set the title for your toolbar here for different fragments different titles
getActivity().setTitle("The Checklist");
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.toggleButton: {
if(usualTasks.isChecked()) {
Toast.makeText(getActivity(), "Toggle button is on", Toast.LENGTH_LONG).show();
showRoleDialog();
FragmentTransaction trans = getFragmentManager().beginTransaction();
trans.replace(R.id.base_pending, new UsualTasks());
WelcomeActivity.persistentbottomSheet.setVisibility(View.INVISIBLE);
//WelcomeActivity.fab.setVisibility(View.INVISIBLE);
trans.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
trans.commit();
}
else {
Toast.makeText(getActivity(), "Toggle button is Off", Toast.LENGTH_LONG).show();
FragmentTransaction trans = getFragmentManager().beginTransaction();
trans.replace(R.id.usual_pending, new PendingTasks());
trans.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
if (WelcomeActivity.filterApplied == true) {
WelcomeActivity.persistentbottomSheet.setVisibility(View.VISIBLE);
WelcomeActivity.persistentbottomSheet.bringToFront();
WelcomeActivity.fab.setVisibility(View.VISIBLE);
}
if(UsualTasks.shown) {
UsualTasks.mSnackBar.dismiss();
}
trans.commit();
}
}
}
}
public void populateList(HashMap<Integer, String> myMap, List myList){
Set<Map.Entry<Integer, String>> setMap = myMap.entrySet();
Iterator<Map.Entry<Integer, String>> iteratorMap = setMap.iterator();
int item=0;
while(iteratorMap.hasNext()) {
Map.Entry<Integer, String> entry = (Map.Entry<Integer, String>) iteratorMap.next();
myList.add(entry.getValue());
item++;
}
}
private void showRoleDialog() {
final Dialog dialog = new Dialog(getContext());
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.usualtask_dialog);
rolelist = new ArrayList<Map<Integer,String>>();
roles= new HashMap<Integer, String>();
roles.put(1, "Senior Manager");
roles.put(2, "Admin");
roles.put(3, "HR");
populateList(roles,rolelist);
ArrayAdapter arrayAdapter = new ArrayAdapter<String>(getContext(), android.R.layout.simple_list_item_single_choice, rolelist)
{
@Override
public View getView(int position, View convertView, ViewGroup parent){
// Get the current item from ListView
View view = super.getView(position,convertView,parent);
TextView tv = (TextView) view.findViewById(android.R.id.text1);
tv.setTextColor(Color.parseColor("#353b41"));
return view;
}
};
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
selectRole= (ListView)dialog.findViewById(R.id.selectrole);
submitRole= (Button)dialog.findViewById(R.id.btsubmitrole);
selectRole.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
selectRole.setAdapter(arrayAdapter);
selectRole.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {}
});
submitRole.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
dialog.dismiss();
}
});
dialog.show();
}
private void createTabIcons() {
RelativeLayout tabOne = (RelativeLayout) LayoutInflater.from(getContext()).inflate(R.layout.pending_tab, null);
TextView textTab=(TextView)tabOne.findViewById(R.id.tab);
ImageView imageTab=(ImageView) tabOne.findViewById(R.id.notifyimage);
//TextDrawable drawable = TextDrawable.builder().buildRound("999",Color.RED); // radius in px
TextDrawable drawable = TextDrawable.builder()
.buildRoundRect("999",Color.RED,18); // radius in px
imageTab.setImageDrawable(drawable);
textTab.setText("Pending");
tabLayout.getTabAt(1).setCustomView(tabOne);
RelativeLayout tabTwo = (RelativeLayout) LayoutInflater.from(getContext()).inflate(R.layout.completed_tab, null);
TextView textTab1=(TextView)tabTwo.findViewById(R.id.pending_tab);
textTab1.setText("Completed");
tabLayout.getTabAt(0).setCustomView(tabTwo);
}
private void initialize(View rootview) {
toolbar = (Toolbar)rootview.findViewById(R.id.toolbar);
viewPager = (ViewPager)rootview.findViewById(R.id.viewpager);
tabLayout = (TabLayout)rootview.findViewById(R.id.tabs);
usualTasks=(ToggleButton)rootview.findViewById(R.id.toggleButton);
}
private void createViewPager(ViewPager viewPager) {
adapter = new DashboardNew.ViewPagerAdapter(getChildFragmentManager());
adapter.addFrag(new CompletedTasks(), "Completed");
adapter.addFrag(new PendingTasks(), "Pending");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
if (position == 0)
return new CompletedTasks();
else
return new PendingTasks();
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
以下是已完成任务的代码：
completedTaskList = (ListView) rootview.findViewById(R.id.completedlist);
BaseMenuActivity.filterState=false;
if(UsualTasks.shown) {
UsualTasks.mSnackBar.dismiss();
}
generateListdata();
return rootview;
}
private void generateListdata() {
completedTasks.add(new completedTasks("Call the Owner","Wembley GP","Daily",R.drawable.completed_tick,R.drawable.access_dashboard));
completedTasks.add(new completedTasks("Check the safety of patients","Wembley GP","Daily",R.drawable.completed_tick,R.drawable.safety_dashboard));
completedTasks.add(new completedTasks("Admin needs to do specific task","Wembley GP","Daily",R.drawable.completed_tick,R.drawable.admin_dashboard));
completedTasks.add(new completedTasks("Get the specific work done","Wembley GP","Daily",R.drawable.completed_tick,R.drawable.access_dashboard));
completedTasks.add(new completedTasks("Need to hire more resources","Wembley GP","Daily",R.drawable.completed_tick,R.drawable.hr_dashboard));
completedTasks.add(new completedTasks("How are patients behaving?","Wembley GP","Daily",R.drawable.completed_tick,R.drawable.patient_experience_dashboard));
completedTasks.add(new completedTasks("Need to adjust the audit report","Wembley GP","Daily",R.drawable.completed_tick,R.drawable.finance_dashboard));
//getListView().setDividerHeight(10);
ArrayAdapter<com.example.attech.checklist_attech.Model.completedTasks> adapter = new CompletedTaskAdapter(getContext(), 0,completedTasks);
completedTaskList.setAdapter(adapter);
completedTaskList.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
if (position == 0) {}
if (position == 1) {}
if (position == 2) {
//Intent myIntent = new Intent(view.getContext(), ViewUser.class);
//startActivityForResult(myIntent, 0);
}
}
});
}
}
这是pendingtasks的代码：
initialize(rootview);
generateListdataAssigned();
generateListdata();
generateselectall();
clickListeners();
return rootview;
}
private void clickListeners() {
assignTask.setOnClickListener(this);
assignTaskbottom.setOnClickListener(this);
}
private void populateList(HashMap<Integer, String> myMap, List myList){
Set<Map.Entry<Integer, String>> setMap = myMap.entrySet();
Iterator<Map.Entry<Integer, String>> iteratorMap = setMap.iterator();
int item=0;
while(iteratorMap.hasNext()) {
Map.Entry<Integer, String> entry = (Map.Entry<Integer, String>) iteratorMap.next();
myList.add(entry.getValue());
item++;
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.assignTaskPending: {
selected = !selected;
if (selected) {
Toast.makeText(getActivity(), "Assigned", Toast.LENGTH_LONG).show();
assignTask.setBackgroundResource(R.color.dark_grey);
Toast.makeText(getActivity(),""+WelcomeActivity.filterApplied,Toast.LENGTH_LONG).show();
pendingTaskListAssigned.setVisibility(View.VISIBLE);
WelcomeActivity.persistentbottomSheet.setVisibility(View.INVISIBLE);
selectAllListView.setVisibility(View.VISIBLE);
assignTaskbottom.setVisibility(View.VISIBLE);
pendingTaskList.setVisibility(View.INVISIBLE);
}
else {
Toast.makeText(getActivity(), "Clicked", Toast.LENGTH_LONG).show();
Toast.makeText(getActivity(),""+WelcomeActivity.filterApplied,Toast.LENGTH_LONG).show();
pendingTaskListAssigned.setVisibility(View.INVISIBLE);
assignTaskbottom.setVisibility(View.INVISIBLE);
selectAllListView.setVisibility(View.INVISIBLE);
assignTask.setBackgroundResource(R.drawable.box_grey);
pendingTaskList.setVisibility(View.VISIBLE);
if (WelcomeActivity.filterApplied) {
WelcomeActivity.persistentbottomSheet.setVisibility(View.VISIBLE);
WelcomeActivity.persistentbottomSheet.bringToFront();
WelcomeActivity.fab.setVisibility(View.VISIBLE);
}
}
break;
}
case R.id.btassignTask: {
showAssignTaskDialog();
break;
}
}
}
private void initialize(View rootview) {
pendingTaskList = (ListView) rootview.findViewById(R.id.pendinglist);
pendingTaskListAssigned = (ListView) rootview.findViewById(R.id.pendinglistassigned);
assignTask = (Button) rootview.findViewById(R.id.assignTaskPending);
assignTaskbottom = (Button) rootview.findViewById(R.id.btassignTask);
selectAllListView= (ListView)rootview.findViewById(R.id.selectalllist);
}
private void generateListdataAssigned() {
pendingTasksAssigned.add(new pendingTasks("System Tasks","Wembley GP","Daily",R.drawable.pending_clock_icon, R.drawable.safety_dashboard));
pendingTasksAssigned.add(new pendingTasks("Call answer speed","Wembley GP","Daily",R.drawable.pending_clock_icon, R.drawable.access_dashboard));
pendingTasksAssigned.add(new pendingTasks("Appointment reasons","Wembley GP","Daily",R.drawable.pending_clock_icon, R.drawable.access_dashboard));
pendingTasksAssigned.add(new pendingTasks("Admin needs to do specific task","Wembley GP","Daily",R.drawable.pending_clock_icon, R.drawable.hr_dashboard));
ArrayAdapter<pendingTasks> adapter = new PendingAssignedAdapter(getContext(), 0, pendingTasksAssigned);
pendingTaskListAssigned.setAdapter(adapter);
pendingTaskListAssigned.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
CheckBox checkBox=(CheckBox)view.findViewById(R.id.checkboxassigned);
checkBox.performClick();
if(checkBox.isChecked()){
countChecks = countChecks + 1;
}
else{
countChecks = countChecks - 1;
}
if(check == true){
selectAllListView.setItemChecked(0, false);
check = !check;
}
if(countChecks == pendingTaskListAssigned.getCount()){
selectAllListView.setItemChecked(0, true);
check = ! check;
}
}
});
}
//populating the arraylist, creating an adapter and setting it to a list view
private void generateListdata() {
pendingTasks.add(new pendingTasks("System Tasks", "Wembley GP", "Daily", R.drawable.pending_clock_icon, R.drawable.safety_dashboard));
pendingTasks.add(new pendingTasks("Call answer speed", "Wembley GP", "Daily", R.drawable.pending_clock_icon, R.drawable.access_dashboard));
pendingTasks.add(new pendingTasks("Appointment reasons", "Wembley GP", "Daily", R.drawable.pending_clock_icon, R.drawable.access_dashboard));
ArrayAdapter<pendingTasks> adapter = new PendingTaskAdapter(getContext(), 0, pendingTasks);
pendingTaskList.setAdapter(adapter);
pendingTaskList.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
showInputDialog();
if (position == 0) {}
if (position == 1) {
//Intent myIntent = new Intent(view.getContext(), AddUser.class);
//startActivityForResult(myIntent, 0);
}
if (position == 2) {
//Intent myIntent = new Intent(view.getContext(), ViewUser.class);
//startActivityForResult(myIntent, 0);
}
}
});
}
private void generateselectall() {
selectallList= new ArrayList<Map<Integer,String>>();
selectall= new HashMap<Integer, String>();
selectall.put(1, "Select All");
populateList(selectall,selectallList);
ArrayAdapter arrayAdapter = new ArrayAdapter<String>(getContext(),
android.R.layout.simple_list_item_single_choice, selectallList)
{
@Override
public View getView(int position, View convertView, ViewGroup parent){
// Get the current item from ListView
View view = super.getView(position,convertView,parent);
TextView tv = (TextView) view.findViewById(android.R.id.text1);
tv.setTextColor(Color.BLACK);
tv.setTextSize(13);
ViewGroup.LayoutParams params = view.getLayoutParams();
// Set the height of the Item View
params.height = LinearLayout.LayoutParams.WRAP_CONTENT;
view.setLayoutParams(params);
view.setPadding(37,0,10,10);
return view;
}
};
selectAllListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
selectAllListView.setAdapter(arrayAdapter);
selectAllListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//Toast.makeText(getContext(), "Hello", Toast.LENGTH_SHORT).show();
int firstListItem = pendingTaskListAssigned.getFirstVisiblePosition();
int lastVisibleItem = pendingTaskListAssigned.getFirstVisiblePosition() + pendingTaskListAssigned.getChildCount() - 1;
check = ! check;
for(int i=0; i < pendingTaskListAssigned.getCount(); i++){
if(i>lastVisibleItem || i<firstListItem){
View item = (View) pendingTaskListAssigned.getAdapter().getView(i, null, pendingTaskListAssigned);
CheckBox checkbox = (CheckBox)item.findViewById(R.id.checkboxassigned);
checkbox.setChecked(check);
}
else{
ViewGroup item = (ViewGroup)pendingTaskListAssigned.getChildAt(i - firstListItem);
CheckBox checkbox = (CheckBox)item.findViewById(R.id.checkboxassigned);
checkbox.setChecked(check);
}
}
if(check == true){
countChecks = pendingTaskListAssigned.getCount();
}
else{
countChecks = 0;
}
}
});
}
protected void showInputDialog() {
final Dialog dialog = new Dialog(getContext());
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.task_dialog);
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
tbutton = (ToggleButton)dialog.findViewById(R.id.toggleButton);
toollamp= (ImageButton)dialog.findViewById(R.id.lamptool);
tooli= (ImageButton)dialog.findViewById(R.id.itool);
tooldetails= (TextView) dialog.findViewById(R.id.tooldetail);
submit=(Button)dialog.findViewById(R.id.btsubmit);
toollamp.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
tooldetails.setText("Target for staff 2 rings and answer.Check daily for 2x 5 mins");
}
});
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Toast.makeText(getActivity(), "Dismiss", Toast.LENGTH_LONG).show();
dialog.dismiss();
}
});
tooli.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
tooldetails.setText("Check daily for 2x 5 mins");
}
});
tbutton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(tbutton.isChecked()) {
Toast.makeText(getActivity(), "Toggle button is on", Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(getActivity(), "Toggle button is Off", Toast.LENGTH_LONG).show();
}
}
});
dialog.show();
}
protected void showAssignTaskDialog() {
final Dialog dialog = new Dialog(getContext());
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.assign_task_dialog);
dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
Close= (ImageButton)dialog.findViewById(R.id.close);
myself=(Button)dialog.findViewById(R.id.btmyself);
others=(Button)dialog.findViewById(R.id.btothers);
Close.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
dialog.dismiss();
}
});
myself.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getActivity(), "Myself", Toast.LENGTH_LONG).show();
}
});
others.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getActivity(), "Others", Toast.LENGTH_LONG).show();
Intent intent= new Intent(getContext(), AssignTasks.class);
startActivity(intent);
}
});
dialog.show();
}
}
答案 0 :(得分：1)
对于遇到此问题的人，请使用cardviews和recyclerviews。列表视图的数据太多了。使用的是cardviews和recyclerviews，而且滞后已经消失。
答案 1 :(得分：0)
首先，我无法了解为什么要创建两次片段
你实际上是在这里创建片段
private void createViewPager(ViewPager viewPager) {
adapter = new DashboardNew.ViewPagerAdapter(getChildFragmentManager());
adapter.addFrag(new CompletedTasks(), "Completed");
adapter.addFrag(new PendingTasks(), "Pending");
viewPager.setAdapter(adapter);
}
然后你在这里创建它们。再次
@Override
public Fragment getItem(int position) {
if (position == 0)
return new CompletedTasks();
else
return new PendingTasks();
}
我想正确的方法是删除这些行
adapter.addFrag(new CompletedTasks(), "Completed");
adapter.addFrag(new PendingTasks(), "Pending");
在其他情况下，屏幕旋转会出现很大问题。
您可以设置屏幕外限制（默认情况下仅限1），因此片段只会创建一次并且不会被删除
viewPager.setOffscreenPageLimit(2);
此外，我拒绝理解这些行的含义
completedTasks.add(new completedTasks(...);
是CompletedTasks片段吗？您添加了什么以及如何添加？
答案 2 :(得分：0)
碎片的onCreate（）函数中没有这样的东西。
但它仍然落后，对吗？我认为问题在于您的布局太重，因为您在onCreateView（）中所做的唯一工作就是设置您的布局。
请检查您的图像是否具有非常高的像素密度。这是一个最常见的错误。 Android系统需要时间将布局中的高像素图像转换为适合您的设备的较低像素密度，这需要花费时间并导致延迟。 其他原因可能是布局层次结构不好。
答案 3 :(得分：0)
您应该从 FragmentActivity
扩展容器活动public class MainActivity extends FragmentActivity
{
}
这是片段之间的非常快的切换。
最好在xml布局中使用标记 并在点击标签或底部标签时显示，隐藏
//代码示例：
FragmentManager fm = getSupportFragmentManager();
fm.beginTransaction()
.show(fm.findFragmentById(fragment))
.hide(fm.findFragmentById(activePage))
.commit();