我目前正在使用Firebase在Android Studio中构建忠诚度应用程序。
我目前在应用程序内未配装条形码扫描仪。当用户收集了10张邮票时，我已将该应用程序设计为具有会员券。会员凭证是一个QR码，会先扫描后再从数据库中删除，因此将从凭证活动中删除该凭证。
我想隐藏警报对话框，但不使用onClick方法。
这是我的代金券类中的代码：
public class VoucherFragment extends Fragment implements View.OnClickListener {
private VoucherViewModel voucherViewModel;
Button btVoucher1, btVoucher2, btVoucher3, btVoucher4, btVoucher5, btVoucher6, btVoucher7, btVoucher8, btVoucher9, btVoucher10;
TextView txtVoucher;
ImageView voucherImage;
DatabaseReference databaseReference;
FirebaseAuth firebaseAuth;
String userID;
Dialog voucherDialog;
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
voucherViewModel = ViewModelProviders.of( this ).get( VoucherViewModel.class );
View root = inflater.inflate( R.layout.fragment_voucher_customer, container, false );
btVoucher1 = root.findViewById( R.id.btVoucher1 );
btVoucher2 = root.findViewById( R.id.btVoucher2 );
btVoucher3 = root.findViewById( R.id.btVoucher3 );
btVoucher4 = root.findViewById( R.id.btVoucher4 );
btVoucher5 = root.findViewById( R.id.btVoucher5 );
btVoucher6 = root.findViewById( R.id.btVoucher6 );
btVoucher7 = root.findViewById( R.id.btVoucher7 );
btVoucher8 = root.findViewById( R.id.btVoucher8 );
btVoucher9 = root.findViewById( R.id.btVoucher9 );
btVoucher10 = root.findViewById( R.id.btVoucher10 );
btVoucher1.setOnClickListener( this );
btVoucher2.setOnClickListener( this );
btVoucher3.setOnClickListener( this );
btVoucher4.setOnClickListener( this );
btVoucher5.setOnClickListener( this );
btVoucher6.setOnClickListener( this );
btVoucher7.setOnClickListener( this );
btVoucher8.setOnClickListener( this );
btVoucher9.setOnClickListener( this );
btVoucher10.setOnClickListener( this );
txtVoucher = root.findViewById( R.id.txtVoucher );
firebaseAuth = FirebaseAuth.getInstance();
userID = firebaseAuth.getUid();
databaseReference = FirebaseDatabase.getInstance().getReference().child( "Customers" ).child( userID );
voucherViewModel.getText().observe( this, new Observer<String>() {
@Override
public void onChanged(@Nullable String s) {
}
} );
databaseReference.addValueEventListener( new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
{
//Check if voucher exists
boolean voucherExists = dataSnapshot.child( "Voucher" ).exists();
if (voucherExists == true) {
String voucherString = getString( R.string.voucher );
txtVoucher.setText( voucherString );
long voucherNumber = dataSnapshot.child( "Voucher" ).getChildrenCount();
String voucherCount = String.valueOf( voucherNumber );
switch (voucherCount)
{
case "1":
btVoucher1.setVisibility( View.VISIBLE );
break;
case "2":
btVoucher1.setVisibility( View.VISIBLE );
btVoucher2.setVisibility( View.VISIBLE );
break;
case "3":
btVoucher1.setVisibility( View.VISIBLE );
btVoucher2.setVisibility( View.VISIBLE );
btVoucher3.setVisibility( View.VISIBLE );
break;
case "4":
btVoucher1.setVisibility( View.VISIBLE );
btVoucher2.setVisibility( View.VISIBLE );
btVoucher3.setVisibility( View.VISIBLE );
btVoucher4.setVisibility( View.VISIBLE );
break;
case "5":
btVoucher1.setVisibility( View.VISIBLE );
btVoucher2.setVisibility( View.VISIBLE );
btVoucher3.setVisibility( View.VISIBLE );
btVoucher4.setVisibility( View.VISIBLE );
btVoucher5.setVisibility( View.VISIBLE );
break;
case "6":
btVoucher1.setVisibility( View.VISIBLE );
btVoucher2.setVisibility( View.VISIBLE );
btVoucher3.setVisibility( View.VISIBLE );
btVoucher4.setVisibility( View.VISIBLE );
btVoucher5.setVisibility( View.VISIBLE );
btVoucher6.setVisibility( View.VISIBLE );
break;
case "7":
btVoucher1.setVisibility( View.VISIBLE );
btVoucher2.setVisibility( View.VISIBLE );
btVoucher3.setVisibility( View.VISIBLE );
btVoucher4.setVisibility( View.VISIBLE );
btVoucher5.setVisibility( View.VISIBLE );
btVoucher6.setVisibility( View.VISIBLE );
btVoucher7.setVisibility( View.VISIBLE );
break;
case "8":
btVoucher1.setVisibility( View.VISIBLE );
btVoucher2.setVisibility( View.VISIBLE );
btVoucher3.setVisibility( View.VISIBLE );
btVoucher4.setVisibility( View.VISIBLE );
btVoucher5.setVisibility( View.VISIBLE );
btVoucher6.setVisibility( View.VISIBLE );
btVoucher7.setVisibility( View.VISIBLE );
btVoucher8.setVisibility( View.VISIBLE );
break;
case "9":
btVoucher1.setVisibility( View.VISIBLE );
btVoucher2.setVisibility( View.VISIBLE );
btVoucher3.setVisibility( View.VISIBLE );
btVoucher4.setVisibility( View.VISIBLE );
btVoucher5.setVisibility( View.VISIBLE );
btVoucher6.setVisibility( View.VISIBLE );
btVoucher7.setVisibility( View.VISIBLE );
btVoucher8.setVisibility( View.VISIBLE );
btVoucher9.setVisibility( View.VISIBLE );
break;
case "10":
btVoucher1.setVisibility( View.VISIBLE );
btVoucher2.setVisibility( View.VISIBLE );
btVoucher3.setVisibility( View.VISIBLE );
btVoucher4.setVisibility( View.VISIBLE );
btVoucher5.setVisibility( View.VISIBLE );
btVoucher6.setVisibility( View.VISIBLE );
btVoucher7.setVisibility( View.VISIBLE );
btVoucher8.setVisibility( View.VISIBLE );
btVoucher9.setVisibility( View.VISIBLE );
btVoucher10.setVisibility( View.VISIBLE );
break;
}
} else {
txtVoucher.setText( "You currently have no vouchers. Please collect 10 stamps to obtain a voucher!" );
}
//Get QRCode
final String qrcode = dataSnapshot.child( "qrCode" ).getValue().toString();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
System.out.println( "The read failed: " + databaseError.getCode() );
}
} );
return root;
}
@Override
public void onClick(final View v)
{
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(v.getContext());
LayoutInflater factory = LayoutInflater.from(v.getContext());
final View view = factory.inflate(R.layout.voucher_dialog, null);
alertDialog.setView(view);
voucherImage = view.findViewById(R.id.dialog_imageview);
alertDialog.setNeutralButton("Close", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
}
});
databaseReference.addValueEventListener( new ValueEventListener()
{
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
switch (v.getId())
{
case R.id.btVoucher1:
String voucher1 = dataSnapshot.child("Voucher").child("1").getValue().toString();
// boolean voucherExists = dataSnapshot.child( "Voucher" ).child( "1" ).exists();
alertDialog.setTitle( "Voucher 1" );
Picasso.with(getActivity()).load(voucher1).into(voucherImage);
alertDialog.show();
break;
case R.id.btVoucher2:
String voucher2 = dataSnapshot.child("Voucher").child("2").getValue().toString();
alertDialog.setTitle( "Voucher 2" );
Picasso.with(getActivity()).load(voucher2).into(voucherImage);
alertDialog.show();
break;
case R.id.btVoucher3:
String voucher3 = dataSnapshot.child("Voucher").child("3").getValue().toString();
alertDialog.setTitle( "Voucher 3" );
Picasso.with(getActivity()).load(voucher3).into(voucherImage);
alertDialog.show();
break;
case R.id.btVoucher4:
String voucher4 = dataSnapshot.child("Voucher").child("4").getValue().toString();
alertDialog.setTitle( "Voucher 4" );
Picasso.with(getActivity()).load(voucher4).into(voucherImage);
alertDialog.show();
break;
case R.id.btVoucher5:
String voucher5 = dataSnapshot.child("Voucher").child("5").getValue().toString();
alertDialog.setTitle( "Voucher 5" );
Picasso.with(getActivity()).load(voucher5).into(voucherImage);
alertDialog.show();
break;
case R.id.btVoucher6:
String voucher6 = dataSnapshot.child("Voucher").child("6").getValue().toString();
alertDialog.setTitle( "Voucher 6" );
Picasso.with(getActivity()).load(voucher6).into(voucherImage);
alertDialog.show();
break;
case R.id.btVoucher7:
String voucher7 = dataSnapshot.child("Voucher").child("7").getValue().toString();
alertDialog.setTitle( "Voucher 7" );
Picasso.with(getActivity()).load(voucher7).into(voucherImage);
alertDialog.show();
break;
case R.id.btVoucher8:
String voucher8 = dataSnapshot.child("Voucher").child("8").getValue().toString();
alertDialog.setTitle( "Voucher 8" );
Picasso.with(getActivity()).load(voucher8).into(voucherImage);
alertDialog.show();
break;
case R.id.btVoucher9:
String voucher9 = dataSnapshot.child("Voucher").child("9").getValue().toString();
alertDialog.setTitle( "Voucher 9" );
Picasso.with(getActivity()).load(voucher9).into(voucherImage);
alertDialog.show();
break;
case R.id.btVoucher10:
String voucher10 = dataSnapshot.child("Voucher").child("10").getValue().toString();
alertDialog.setTitle( "Voucher 10" );
Picasso.with(getActivity()).load(voucher10).into(voucherImage);
alertDialog.show();
break;
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
} );
}
}
任何帮助将不胜感激。
是，如果满足关闭要求，则可以隐藏AlertDialog。为此，您需要做的就是在警报对话框参考上调用dismiss（）方法。
final AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(v.getContext());
// Now to dismiss/close all you need to do is like below
myAlertDialog.dismiss()
也要从同一活动中的任何位置关闭此对话框，可以将其声明为类变量。
public MainActivity extends WhateverActivity{
private AlertDialog myAlertDialog = null;
// New Initialize it anywhere in the activity before using it
// i.e. calling .show()
//now dismiss it as
if(myAlertDialog != null && myAlertDialog.isShowing){
myAlertDialog.dismiss()
}
}
由于此初始化，请确保检查null
private AlertDialog myAlertDialog = null;
我希望它会有所帮助。