小编Hem*_*ath的帖子

//身体就像这样

{
    "to":
    "/topics/NEWS"
    ,
    "data":{
        "extra_information": "This is some extra information"
    },

//我需要提供的通知

"notification":{
            "title": "ChitChat Group",
            "text": "You may have new messages",
            "click_action":"ChatActivity"
        }
    }

我已经使用 Firebase 身份验证用户注册方法创建了注册方法。

如何使用 firebase auth 和 android studio 删除注册用户？

private void registerUser(){
            String email = editTextEmail.getText().toString().trim();
            String password = editTextPassword.getText().toString().trim();


firebaseAuth.createUserWithEmailAndPassword(email,password)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>(){

                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if(task.isSuccessful()){
                        //user successfully registered and logged in
                        Toast.makeText(MainActivity.this, "Registered Successfully",Toast.LENGTH_SHORT).show();
                        progressDialog.dismiss();
                        finish();
                        startActivity(new Intent(getApplicationContext(),ProfileActivity.class));

                    }else{
                        Toast.makeText(MainActivity.this, "Could Not Register. Please Try Again Later",Toast.LENGTH_SHORT).show();
                        progressDialog.dismiss();
                    }
                }
            });

}
private void deleteUser(){

  // TODO: Fill this method

}

我尝试database从我的fragment onViewCreated方法中检索数据,我使用了FirebaseRecylerAdapter,如下所示

@Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        FirebaseRecyclerAdapter<AllUsers, AllUsersViewHolder> firebaseRecyclerAdapter;
    }

    public static class AllUsersViewHolder extends RecyclerView.ViewHolder {

        View view;

        public AllUsersViewHolder(View itemView) {
            super(itemView);
            view = itemView;
        }
    }

当我使用firebaseRecyclerAdapter = new FirebaseRecyclerAdapter它不会给我populateViewHolder方法只是给下面的方法

FirebaseRecyclerAdapter<AllUsers, AllUsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<AllUsers, AllUsersViewHolder>() {
            @Override
            protected void onBindViewHolder(AllUsersViewHolder holder, int position, AllUsers model) {

            }

            @Override
            public AllUsersViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
                return null;
            } …

我有一个字符串：

var str = `<ul class="errorlist"><li>Enter a valid email address.</li></ul>`;

从该字符串中，如何提取子字符串：

'Enter a valid email address.'

变成另一个变量？

如果我的表单中的表单中存在错误,我会尝试发出警报,如下所示,有一些文本字段验证

<div class="form-group">
    <div class="row">
        <div class="col-lg-4 col-md-4 col-sm-4 col-xm-12">
            <label class="control-label form-text-align text-top-padding ">
                @Resources.StandardPrice
            </label>
        </div>
        <div class="col-lg-8 col-md-8 col-sm-8 col-xm-12 text-top-padding">
            @Html.TextBoxFor(model => model.products.BasicPrice, new { @class = "form-control errorClass", @id = "basicPrice", @placeholder = @Resources.StandardPrice, @onblur = "addClass(this)", @maxlength = Resources.AddNewProductFieldMaxLength })
            @Html.ValidationMessageFor(model => model.products.BasicPrice, null, new { @class = "help-inline" })
        </div>
    </div>
</div>

如果表格中有错误,我该如何发出提醒

我有下面的组件，它有4个状态值

class ComposedTextField extends React.Component {
  state = {
    name: '',
    title: '',
    email: '',
    experience: ''
  };

  handleChange = event => {
    this.setState({ 
          [event.target.name]:event.target.value,
          [event.target.title]:event.target.value,
          [event.target.email]:event.target.value,
          [event.target.experience]:event.target.value
        });
  };

  render() {
    const { classes } = this.props;

    return (
      <div>
        <Typography variant="headline">Header Info</Typography>
        <FormControl fullWidth className={classes.formControl}>
          <InputLabel htmlFor="name-simple">Name</InputLabel>
          <Input name="name" value={this.state.name} id="name-simple" onChange={this.handleChange}/>
        </FormControl><br></br>
        <FormControl fullWidth className={classes.formControl}>
          <InputLabel htmlFor="title-simple">Title</InputLabel>
          <Input name="title" id="title-simple" value={this.state.title} onChange={this.handleChange}/>
        </FormControl><br></br>
        <FormControl fullWidth className={classes.formControl}>
          <InputLabel htmlFor="email-simple">Email</InputLabel>
          <Input name="email" id="email-simple" value={this.state.email} onChange={this.handleChange}/> 
        </FormControl><br></br>
        <FormControl fullWidth className={classes.formControl}> …