android - 排球数据未显示在回收站视图中
问题描述
我正在尝试制作一个送餐应用程序。对于主页，我想使用回收站视图显示餐厅列表，同时使用 volley get 方法获取数据。但是，当我运行该应用程序时，主页上什么都没有显示，它基本上是空白的，大约一分钟后，它显示“系统 ui 没有响应”。我不知道为什么会这样。
这是我的主要活动 KT 文件：
class HomeActivity : AppCompatActivity() {
lateinit var coordinatorLayout : CoordinatorLayout
lateinit var frameLayout: FrameLayout
lateinit var nav_view: NavigationView
lateinit var drawer_layout: DrawerLayout
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_home)
coordinatorLayout = findViewById(R.id.coordinatorLayout)
frameLayout = findViewById(R.id.frame)
nav_view = findViewById(R.id.nav_view)
drawer_layout = findViewById(R.id.drawer_layout)
val navController = Navigation.findNavController(this, R.id.fragment)
NavigationUI.setupWithNavController(nav_view, navController)
NavigationUI.setupActionBarWithNavController(this, navController, drawer_layout)
}
override fun onSupportNavigateUp(): Boolean {
return NavigationUI.navigateUp(Navigation.findNavController(this, R.id.fragment), drawer_layout)
}
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
menuInflater.inflate(R.menu.options_menu, menu)
return true
}
}
这是随附的主要活动布局文件：
<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Activities.MainActivity"
android:id="@+id/drawer_layout">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/coordinatorLayout">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark"
android:elevation="0dp">
</com.google.android.material.appbar.AppBarLayout>
<FrameLayout
android:id="@+id/frame"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<fragment
android:id="@+id/fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/nav_graph" />
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="@menu/nav_menu"
app:headerLayout="@layout/nav_header"/>
</androidx.drawerlayout.widget.DrawerLayout>
如您所见，我使用 NAV 主机片段来实现抽屉式导航。导航抽屉中的第一个片段是显示餐厅列表的主页片段
这是家庭片段 KT 文件：
class HomeFragment : Fragment() {
lateinit var homeRecyclerView: RecyclerView
lateinit var layoutManager: RecyclerView.LayoutManager
lateinit var homeRecyclerAdapter:HomeRecyclerAdapter
var restaurantInfoList = arrayListOf<Restaurants>()
lateinit var progressLayout: RelativeLayout
lateinit var progressBar: ProgressBar
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val view = inflater.inflate(R.layout.fragment_home, container, false)
homeRecyclerView = view.findViewById(R.id.homeRecyclerView)
layoutManager = LinearLayoutManager(activity)
progressLayout = view.findViewById(R.id.progressLayout)
progressBar = view.findViewById(R.id.progressBar)
progressLayout.visibility = View.VISIBLE
val queue = Volley.newRequestQueue(activity as Context)
val url = "http://13.235.250.119/v2/restaurants/fetch_result/"
if(ConnectionManager().checkConnectivity(activity as Context)) {
val jsonObjectRequest = object : JsonObjectRequest(
Request.Method.GET,
url,
null,
Response.Listener {
try{
progressLayout.visibility = View.GONE
val res = it.getJSONObject("data")
val success = it.getBoolean("success")
if (success) {
val data = res.getJSONArray("data")
for (i in 0 until data.length()) {
val restaurantJsonObject = data.getJSONObject(i)
val restaurantObject = Restaurants(
restaurantJsonObject.getString("id"),
restaurantJsonObject.getString("name"),
restaurantJsonObject.getString("rating"),
restaurantJsonObject.getString("cost_for_one"),
restaurantJsonObject.getString("image_url")
)
restaurantInfoList.add(restaurantObject)
}
homeRecyclerAdapter =
HomeRecyclerAdapter(activity as Context, restaurantInfoList)
homeRecyclerView.adapter = homeRecyclerAdapter
homeRecyclerView.layoutManager = layoutManager
homeRecyclerView.addItemDecoration(
DividerItemDecoration(
homeRecyclerView.context,
(layoutManager as LinearLayoutManager).orientation
)
)
}else{
Toast.makeText(activity as Context, "Some Error Occured", Toast.LENGTH_SHORT).show()
}
}
catch(e: JSONException){
Toast.makeText(activity as Context, "Some error occurred", Toast.LENGTH_LONG).show()
}
},
Response.ErrorListener {
// error handling
if(activity != null) {
Toast.makeText(
activity as Context,
"Volley error occurred",
Toast.LENGTH_LONG
).show()
}
}
) {
override fun getHeaders(): MutableMap<String, String> {
val headers = HashMap<String, String>()
headers["Content-type"] = "application/json"
headers["token"] = "046a59f668ea81"
return headers
}
}
queue.add(jsonObjectRequest)
}else{
val dialog = AlertDialog.Builder(activity as Context)
dialog.setTitle("Failure")
dialog.setMessage("Internet Connection Not Found")
dialog.setPositiveButton("Open Settings"){
text, listener ->
val settingsIntent = Intent(Settings.ACTION_WIRELESS_SETTINGS)
startActivity(settingsIntent)
activity?.finish()
}
dialog.setNegativeButton("Cancel"){
text, listener ->
ActivityCompat.finishAffinity(activity as Activity)
}
dialog.create()
dialog.show()
}
return view
}
}
主页片段的 xml 文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Activities.Fragments.HomeFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/homeRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
android:layout_margin="5dp"/>
<RelativeLayout
android:id="@+id/progressLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white">
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"/>
</RelativeLayout>
</RelativeLayout>
以及单行的回收站视图布局：
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="100dp"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_margin="6dp"
app:cardCornerRadius="4dp">
<LinearLayout
android:id="@+id/llRestaurantContent"
android:layout_width="match_parent"
android:layout_height="100dp"
android:weightSum="12">
<ImageView
android:id="@+id/imgRestaurant"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3"
android:src="@drawable/ic_restaurant"/>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="6">
<TextView
android:id="@+id/txtRestaurantName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Restaurant Name"
android:textSize="20sp"
android:padding="10dp"
android:textStyle="bold"/>
<TextView
android:id="@+id/txtRestaurantCost"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="cost"
android:textSize="20sp"
android:padding="10dp"
android:drawableLeft="@drawable/ic_money"/>
</RelativeLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="50dp"
android:src="@drawable/favorites_heart_icon"/>
<TextView
android:id="@+id/txtRestaurantRating"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="rating"
android:textSize="20sp"
android:paddingTop="12dp"
android:textColor="#ebce61"
android:textStyle="bold"
android:paddingLeft="20dp"/>
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
家庭回收器适配器：
class HomeRecyclerAdapter(val context: Context, var itemList: ArrayList<Restaurants>): RecyclerView.Adapter<HomeRecyclerAdapter.HomeViewHolder>() {
class HomeViewHolder(view: View): RecyclerView.ViewHolder(view){
val txtRestaurantName: TextView = view.findViewById(R.id.txtRestaurantName)
val txtRestaurantCost: TextView = view.findViewById(R.id.txtRestaurantCost)
val txtRestaurantRating: TextView = view.findViewById(R.id.txtRestaurantRating)
val imgRestaurant: ImageView = view.findViewById(R.id.imgRestaurant)
val llRestaurantContent: LinearLayout = view.findViewById(R.id.llRestaurantContent)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): HomeViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.recycler_home_single_row, parent, false)
return HomeViewHolder(view)
}
override fun onBindViewHolder(holder: HomeViewHolder, position: Int) {
val restaurant = itemList[position]
holder.txtRestaurantName.text = restaurant.restaurantName
holder.txtRestaurantCost.text = restaurant.restaurantCost
holder.txtRestaurantRating.text = restaurant.restaurantRating
Picasso.get().load(restaurant.restaurantImage).error(R.drawable.ic_restaurant).into(holder.imgRestaurant)
}
override fun getItemCount(): Int {
return itemList.size
}
}
这是通过请求收到的数据：
{
"data": {
"success": true,
"data": [
{
"id": "1",
"name": "Pind Tadka",
"rating": "4.1",
"cost_for_one": "280",
"image_url": "https://images.pexels.com/photos/1640777/pexels-photo-1640777.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
},
{
"id": "2",
"name": "Garbar Burgers",
"rating": "4.6",
"cost_for_one": "200",
"image_url": "https://images.pexels.com/photos/1639565/pexels-photo-1639565.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
},
{
"id": "3",
"name": "Baco Tell",
"rating": "3.4",
"cost_for_one": "300",
"image_url": "https://images.pexels.com/photos/674578/pexels-photo-674578.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500"
},
{
"id": "4",
"name": "Heera Mahal",
"rating": "4.2",
"cost_for_one": "300",
"image_url": "https://images.pexels.com/photos/1300972/pexels-photo-1300972.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500"
},
{
"id": "5",
"name": "Smokin' Chik",
"rating": "4.0",
"cost_for_one": "250",
"image_url": "https://images.pexels.com/photos/265393/pexels-photo-265393.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500"
},
{
"id": "6",
"name": "Swirley's Shack",
"rating": "3.8",
"cost_for_one": "400",
"image_url": "https://images.pexels.com/photos/699544/pexels-photo-699544.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500"
},
{
"id": "7",
"name": "Dominoe's bread",
"rating": "3.6",
"cost_for_one": "200",
"image_url": "https://images.pexels.com/photos/905847/pexels-photo-905847.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500"
},
{
"id": "8",
"name": "Everything but Food",
"rating": "3.2",
"cost_for_one": "150",
"image_url": "https://images.pexels.com/photos/5938/food-salad-healthy-lunch.jpg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
},
{
"id": "9",
"name": "LFC",
"rating": "4.0",
"cost_for_one": "200",
"image_url": "https://images.pexels.com/photos/60616/fried-chicken-chicken-fried-crunchy-60616.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500"
},
{
"id": "10",
"name": "Central Terk",
"rating": "5.0",
"cost_for_one": "300",
"image_url": "https://images.pexels.com/photos/434213/pexels-photo-434213.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500"
},
{
"id": "11",
"name": "Mitti ke Sandwiches",
"rating": "4.0",
"cost_for_one": "250",
"image_url": "https://images.pexels.com/photos/1600711/pexels-photo-1600711.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
},
{
"id": "13",
"name": "Pizza Put",
"rating": "4.4",
"cost_for_one": "350",
"image_url": "https://images.pexels.com/photos/724216/pexels-photo-724216.jpeg?auto=compress&cs=tinysrgb&h=650&w=940"
},
{
"id": "14",
"name": "Burger Jack",
"rating": "3.7",
"cost_for_one": "250",
"image_url": "https://images.pexels.com/photos/983297/pexels-photo-983297.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
},
{
"id": "15",
"name": "Rotten Tomatoes",
"rating": "3.2",
"cost_for_one": "100",
"image_url": "https://images.pexels.com/photos/428301/pexels-photo-428301.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500"
},
{
"id": "16",
"name": "NcDonald's",
"rating": "3.6",
"cost_for_one": "150",
"image_url": "https://images.pexels.com/photos/551991/pexels-photo-551991.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
},
{
"id": "17",
"name": "Askin' Poppins",
"rating": "4.1",
"cost_for_one": "300",
"image_url": "https://images.pexels.com/photos/3631/summer-dessert-sweet-ice-cream.jpg?auto=compress&cs=tinysrgb&dpr=1&w=500"
},
{
"id": "18",
"name": "Baasa Menu",
"rating": "3.4",
"cost_for_one": "200",
"image_url": "https://images.pexels.com/photos/264537/pexels-photo-264537.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500"
}
]
}
}
如果有人可以帮助我找出我哪里出错了，那就太好了！
解决方案
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