我当前正在制作一个包含一些数据的应用程序。我想在需要时编辑或删除它们。我创建了一个PopUp菜单，但问题是它出现在侧面，我希望它出现在单击按钮下方的中央。任何帮助将不胜感激。
这是我的片段活动
public class TemporaryKeyFragment extends Fragment implements PopupMenu.OnMenuItemClickListener{
private ListView lvItems;
private List<Product> lstProducts;
DatabaseReference database;
private int mDisplayDays;
private int mDisplayHours;
private int mDisplayMinutes;
private int mDisplaySeconds;
SwipeRefreshLayout swipeRefreshLayout;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.activity_my_keys, container, false);
lvItems = (ListView) view.findViewById(R.id.lvItems);
SharedPreferences prefs = getActivity().getSharedPreferences(LOCK_PREFS, MODE_PRIVATE);
database = FirebaseDatabase.getInstance().getReference("Generated_Keys/"+prefs.getString("deviceId", null));
database.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot usershot : dataSnapshot.getChildren()){
lstProducts.add(new Product(usershot.child("Username").getValue().toString(),Long.parseLong(usershot.child("RemainingTime").getValue().toString())));
}
lvItems.setAdapter(new CountdownAdapter(getActivity().getApplicationContext(), lstProducts));
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
lstProducts = new ArrayList<>();
swipeRefreshLayout = view.findViewById(R.id.swipe);
lvItems.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
PopupMenu popupMenu = new PopupMenu(getActivity(),view,Gravity.CENTER);
popupMenu.getMenuInflater().inflate(R.menu.popupmenu, popupMenu.getMenu());
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.edit:
Toast.makeText(getActivity().getApplicationContext(),"Edit Data ",Toast.LENGTH_LONG).show();
break;
case R.id.delete:
Toast.makeText(getActivity().getApplicationContext(),"Delete Data",Toast.LENGTH_LONG).show();
break;
default:
break;
}
return true;
}
});
popupMenu.show();
return true;
}
});
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
database.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.exists()){
new AlertDialog.Builder(getActivity())
.setTitle("No Keys")
.setMessage("There are no current generated keys")
.setIcon(android.R.drawable.ic_dialog_alert)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
return;
}})
.setNegativeButton(android.R.string.no, null).show();
}
for (DataSnapshot usershot : dataSnapshot.getChildren()){
lstProducts.add(new Product(usershot.child("Username").getValue().toString(),Long.parseLong(usershot.child("RemainingTime").getValue().toString())));
}
lvItems.setAdapter(new CountdownAdapter(getActivity().getApplicationContext(), lstProducts));
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
swipeRefreshLayout.setRefreshing(false);
}
},2000);
lstProducts.clear();
}
});
return view;
}
/**
* This method will be invoked when a menu item is clicked if the item
* itself did not already handle the event.
*
* @param item the menu item that was clicked
* @return {@code true} if the event was handled, {@code false}
* otherwise
*/
@Override
public boolean onMenuItemClick(MenuItem item) {
return false;
}
private class Product {
String name;
long expirationTime;
public Product(String name, long expirationTime) {
this.name = name;
this.expirationTime = expirationTime;
}
}
public class CountdownAdapter extends ArrayAdapter<Product> {
private LayoutInflater lf;
private List<ViewHolder> lstHolders;
private Handler mHandler = new Handler();
private Runnable updateRemainingTimeRunnable = new Runnable() {
@Override
public void run() {
synchronized (lstHolders) {
Time nowTime = new Time(Time.getCurrentTimezone());
nowTime.setToNow();
nowTime.normalize(true);
long nowMillis = nowTime.toMillis(true);
for (ViewHolder holder : lstHolders) {
holder.updateTimeRemaining();
}
}
}
};
public CountdownAdapter(Context context, List<Product> objects) {
super(context, 0, objects);
lf = LayoutInflater.from(context);
lstHolders = new ArrayList<>();
startUpdateTimer();
}
private void startUpdateTimer() {
Timer tmr = new Timer();
tmr.schedule(new TimerTask() {
@Override
public void run() {
mHandler.post(updateRemainingTimeRunnable);
}
}, 1000, 1000);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = lf.inflate(R.layout.generated_list_item, parent, false);
holder.tvProduct = (TextView) convertView.findViewById(R.id.tvProduct);
holder.tvTimeRemaining = (TextView) convertView.findViewById(R.id.tvTimeRemaining);
convertView.setTag(holder);
synchronized (lstHolders) {
lstHolders.add(holder);
}
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.setData(getItem(position));
return convertView;
}
}
private class ViewHolder {
TextView tvProduct;
TextView tvTimeRemaining;
Product mProduct;
public void setData(Product item) {
mProduct = item;
tvProduct.setText(item.name);
updateTimeRemaining();
}
public void updateTimeRemaining() {
Time nowTime = new Time(Time.getCurrentTimezone());
nowTime.setToNow();
nowTime.normalize(true);
long nowMillis = nowTime.toMillis(true);
long timeDiff = mProduct.expirationTime - nowMillis;
if (timeDiff > 0) {
TemporaryKeyFragment.this.mDisplayDays = (int) (((timeDiff / 1000) / 86400));
TemporaryKeyFragment.this.mDisplayHours = (int) (((timeDiff / 1000) - (TemporaryKeyFragment.this.mDisplayDays * 86400)) / 3600);
TemporaryKeyFragment.this.mDisplayMinutes = (int) (((timeDiff / 1000) - ((TemporaryKeyFragment.this.mDisplayDays * 86400) + (TemporaryKeyFragment.this.mDisplayHours * 3600))) / 60);
TemporaryKeyFragment.this.mDisplaySeconds = (int) ((timeDiff / 1000) % 60);
tvTimeRemaining.setText(mDisplayDays + " days " + mDisplayHours + " hrs " + mDisplayMinutes+ " mins " + mDisplaySeconds + " sec");
} else {
tvTimeRemaining.setText("Expired!!");
}
}
}
我假设不需要布局，但是如果需要，请在下面添加注释。非常感谢
答案 0 :(得分：0)
PopupMenu popupMenu = new PopupMenu(getActivity(),view,Gravity.BOTTOM);
并通过按钮视图。