Question

由于某种原因，我的RecyclerView的内容（即$db = mysqli_connect('localhost', 'root', '', 'registration');数组中的字母）没有显示为例外。应该出现6个字母，但只有2个出现。我已经为RecyclerView本身及其父级使用了$query = "INSERT INTO users (ip, username, email, password) VALUES('".$_SERVER['REMOTE_ADDR']."', '$username', '$email', '$password')";，但这仍然没有改变。

包含RecyclerView（用于网格）的CardView XML

<?php
session_start();

// initializing variables
$ip = "";
$username = "";
$email    = "";
$errors = array();

// connect to the database
$db = mysqli_connect('localhost', 'root', '', 'registration');


// REGISTER USER
if (isset($_POST['reg_user'])) {
  // receive all input values from the form
  $username = mysqli_real_escape_string($db, $_POST['username']);
  $email = mysqli_real_escape_string($db, $_POST['email']);
  $password_1 = mysqli_real_escape_string($db, $_POST['password_1']);
  $password_2 = mysqli_real_escape_string($db, $_POST['password_2']);

  // form validation: ensure that the form is correctly filled ...
  // by adding (array_push()) corresponding error unto $errors array
  if (empty($username)) { array_push($errors, "Username is required"); }
  if (empty($email)) { array_push($errors, "Email is required"); }
  if (empty($password_1)) { array_push($errors, "Password is required"); }
  if ($password_1 != $password_2) {
    array_push($errors, "The two passwords do not match");
  }

  // first check the database to make sure
  // a user does not already exist with the same username and/or email
  $user_check_query = "SELECT * FROM users WHERE username='$username' OR email='$email' LIMIT 1";
  $result = mysqli_query($db, $user_check_query);
  $user = mysqli_fetch_assoc($result);

  if ($user) { // if user exists
    if ($user['username'] === $username) {
      array_push($errors, "Username already exists");
    }

    if ($user['email'] === $email) {
      array_push($errors, "Email already exists");
    }
  }

  // Finally, register user if there are no errors in the form
  if (count($errors) == 0) {
    $password = md5($password_1);//encrypt the password before saving in the database


    $query = "INSERT INTO users (ip, username, email, password)
              VALUES('".$_SERVER['REMOTE_ADDR']."', '$username', '$email', '$password')";
    mysqli_query($db, $query);

    $_SESSION['username'] = $username;
    $_SESSION['success'] = "You are now logged in";
    header('location: index.php');
  }
}

// ...
// ...

// LOGIN USER
if (isset($_POST['login_user'])) {
  $username = mysqli_real_escape_string($db, $_POST['username']);
  $password = mysqli_real_escape_string($db, $_POST['password']);

  if (empty($username)) {
    array_push($errors, "Username is required");
  }
  if (empty($password)) {
    array_push($errors, "Password is required");
  }

  if (count($errors) == 0) {
    $password = md5($password);
    $query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
    $results = mysqli_query($db, $query);
    if (mysqli_num_rows($results) == 1) {


      $_SESSION['username'] = $username;
      $_SESSION['success'] = "You are now logged in";
      header('location: index.php');
    }else {
        array_push($errors, "Wrong username or password combination");
    }
  }
}

片段中与RecyclerView相关的代码

String

RecyclerView适配器类

android:layout_height="wrap_content"

gridview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:focusable="true"
    android:id="@+id/cardview_gv">

    <LinearLayout
        android:id="@+id/cardview_gv_main"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="10dp"
        android:animateLayoutChanges="true">

        <LinearLayout
            android:id="@+id/cardview_gv_titlerow"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:weightSum="100">

            <TextView
                android:id="@+id/tv_gv_title"
                android:layout_weight="90"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:textColor="?android:attr/textColorPrimary"
                style="@android:style/TextAppearance.Medium" />

            <TextView
                android:id="@+id/tv_gv_expandcollapse"
                android:clickable="true"
                android:focusable="true"
                android:layout_weight="10"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="10dp" />
        </LinearLayout>

        <RelativeLayout
            android:id="@+id/relativelayout_gv"
            android:animateLayoutChanges="true"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.RecyclerView
                xmlns:android="http://schemas.android.com/apk/res/android"
                android:id="@+id/rv"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:nestedScrollingEnabled="false"
                android:overScrollMode="never"
                android:scrollbars="none" />
        </RelativeLayout>
    </LinearLayout>
</android.support.v7.widget.CardView>

Answer 1

您必须将recyclerview项的高度设置为wrap_content，否则它将展开以占用所有可用空间（第2行及更多行不在屏幕上）。

Here's my Gemfile:

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.5.0'

gem 'rails', '~> 5.2.0'
gem 'puma', '~> 3.11'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.2'
gem 'jbuilder', '~> 2.5'
gem 'mini_magick'
gem 'jquery-rails'
gem 'devise'
gem 'bootsnap'
gem 'bootstrap', '~> 4.1.3'
gem 'sprockets-rails'
gem 'bootstrap-sass'
gem 'bcrypt', '~> 3.1.7'
gem 'friendly_id', '~> 5.1.0'
gem 'stripe'
gem 'figaro'
gem 'magnific-popup-rails', '~> 1.1.0'
gem 'simple_form'
gem 'acts-as-taggable-on'
gem 'aws-sdk' , '~> 3'
gem 'aws-sdk-s3', require: false
gem 'simple_form_extension'
gem 'recaptcha', require: "recaptcha/rails"
gem 'font-awesome-rails'
gem 'trix', git: 'https://github.com/bcoia/trix.git'

group :production do
  gem 'pg', '~> 0.20.0'
  gem 'rails_12factor'
end

group :development, :test do
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  gem 'sqlite3'
end

group :development do
  gem 'sqlite3'
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

group :test do
  gem 'sqlite3'
  gem 'capybara', '>= 2.15', '< 4.0'
  gem 'selenium-webdriver'
  gem 'chromedriver-helper'
end

gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]


  [1]: https://medium.com/alturasoluciones/setting-up-rails-5-active-storage-with-amazon-s3-3d158cf021ff
  [2]: https://edgeguides.rubyonrails.org/active_storage_overview.html

RecyclerView中的网格项未正确显示

1 个答案: