我有一个带有显示卡片 View 的 GridLayoutManager 的 RecyclerView。我希望卡片根据屏幕大小重新排列(Google Play 应用程序使用它的应用程序卡片做这种事情)。这是一个例子:
这是我的应用目前的外观:
如您所见，卡片只是拉伸(stretch)，不适合因方向更改而产生的空白空间。那么我该怎么做呢？
代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Json;
using System.Threading;
using System.Threading.Tasks;
using Android.Media;
using Android.App;
using Android.Support.V4.App;
using Android.Support.V4.Content.Res;
using Android.Support.V4.Widget;
using Android.Support.V7.Widget;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Util;
using Android.Views;
using Android.Widget;
using Android.Net;
using Android.Views.Animations;
using Android.Graphics;
using Android.Graphics.Drawables;
using Newtonsoft.Json;
using *******.Adapters;
using *******.Models;
namespace *******.Fragments {
public class Dashboard : GridLayoutBase {
private ISharedPreferences pref;
private SessionManager session;
private string cookie;
private DeviceModel deviceModel;
private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;
// private RecyclerView.LayoutManager layoutManager;
private GridLayoutManager gridLayoutManager;
private List<ItemData> itemData;
private Bitmap lastPhotoBitmap;
private Drawable lastPhotoDrawable;
private static Activity activity;
private ProgressDialog progressDialog;
private TextView noData;
private const string URL_DASHBOARD = "http://192.168.1.101/appapi/getdashboard";
private const string URL_DATA = "http://192.168.1.101/appapi/getdata";
public override void OnCreate(Bundle bundle) {
base.OnCreate(bundle);
activity = Activity;
session = new SessionManager();
pref = activity.GetSharedPreferences("UserSession", FileCreationMode.Private);
cookie = pref.GetString("PHPSESSID", string.Empty);
}
public async override void OnStart() {
base.OnStart();
progressDialog = ProgressDialog.Show(activity, String.Empty, GetString(Resource.String.loading_text));
progressDialog.Window.ClearFlags(WindowManagerFlags.DimBehind);
await GetDevicesInfo();
if (deviceModel.Error == "true" && deviceModel.ErrorType == "noSensors") {
recyclerView.Visibility = ViewStates.Gone;
noData.Visibility = ViewStates.Visible;
progressDialog.Hide();
return;
} else {
recyclerView.Visibility = ViewStates.Visible;
noData.Visibility = ViewStates.Gone;
await PopulateSensorStates();
}
// DisplayLastPhoto();
adapter = new ViewAdapter(itemData);
new System.Threading.Thread(new System.Threading.ThreadStart(() => {
activity.RunOnUiThread(() => {
recyclerView.SetAdapter(adapter);
});
})).Start();
progressDialog.Hide();
}
public async Task GetDevicesInfo() {
var jsonFetcher = new JsonFetcher();
JsonValue jsonDashboard = await jsonFetcher.FetchDataWithCookieAsync(URL_DASHBOARD, cookie);
deviceModel = new DeviceModel();
deviceModel = JsonConvert.DeserializeObject<DeviceModel>(jsonDashboard);
}
// Shows sensor states
public async Task PopulateSensorStates() {
itemData = new List<ItemData>();
string lastValue = String.Empty;
foreach (var sensor in this.deviceModel.Sensors) {
var sensorImage = ResourcesCompat.GetDrawable(Resources, Resource.Drawable.smoke_red, null);
switch (sensor.Type) {
case "2":
var jsonFetcher = new JsonFetcher();
JsonValue jsonData = await jsonFetcher.FetchSensorDataAsync(URL_DATA, sensor.Id, "DESC", "1", cookie);
var deviceModel = new DeviceModel();
deviceModel = JsonConvert.DeserializeObject<DeviceModel>(jsonData);
lastValue = deviceModel.SensorData.Last().Value;
break;
case "4":
await RenderLastCameraPhoto();
sensorImage = new BitmapDrawable(Resources, lastPhotoBitmap);
break;
}
itemData.Add(new ItemData() {
id = sensor.Id,
value = lastValue,
type = sensor.Type,
image = sensorImage,
title = sensor.Name.First().ToString().ToUpper() + sensor.Name.Substring(1).ToLower(),
});
}
}
// Shows the last camera photo
public async Task RenderLastCameraPhoto() {
if (deviceModel.Error == "true" && deviceModel.ErrorType == "noPhoto") {
//TODO: Show a "No photo" picture
} else {
string url = deviceModel.LastPhotoLink;
lastPhotoBitmap = await new ImageDownloader().GetImageBitmapFromUrlAsync(url, activity, 300, 300);
}
}
public async void UpdateData(bool isSwipeRefresh) {
await GetDevicesInfo();
if (deviceModel.Error == "true" && deviceModel.ErrorType == "noSensors") {
recyclerView.Visibility = ViewStates.Gone;
noData.Visibility = ViewStates.Visible;
return;
} else {
recyclerView.Visibility = ViewStates.Visible;
noData.Visibility = ViewStates.Gone;
await PopulateSensorStates();
}
adapter = new ViewAdapter(itemData);
new System.Threading.Thread(new System.Threading.ThreadStart(() => {
activity.RunOnUiThread(() => {
recyclerView.SetAdapter(adapter);
});
})).Start();
adapter.NotifyDataSetChanged();
}
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.Inflate(Resource.Layout.Dashboard, container, false);
noData = view.FindViewById<TextView>(Resource.Id.no_data_title);
SwipeRefreshLayout swipeRefreshLayout = view.FindViewById<SwipeRefreshLayout>(Resource.Id.swipe_container);
// swipeRefreshLayout.SetColorSchemeResources(Color.LightBlue, Color.LightGreen, Color.Orange, Color.Red);
// On refresh button press/swipe, updates the recycler view with new data
swipeRefreshLayout.Refresh += (sender, e) => {
UpdateData(true);
swipeRefreshLayout.Refreshing = false;
};
var gridLayoutManager = new GridLayoutManager(activity, 2);
recyclerView = view.FindViewById<RecyclerView>(Resource.Id.dashboard_recycler_view);
recyclerView.HasFixedSize = true;
recyclerView.SetLayoutManager(gridLayoutManager);
recyclerView.SetItemAnimator(new DefaultItemAnimator());
recyclerView.AddItemDecoration(new SpaceItemDecoration(15));
return view;
}
public class ViewAdapter : RecyclerView.Adapter {
private List<ItemData> itemData;
public string sensorId;
public string sensorType;
private ImageView imageId;
private TextView sensorValue;
private TextView sensorTitle;
public ViewAdapter(List<ItemData> itemData) {
this.itemData = itemData;
}
public class ItemView : RecyclerView.ViewHolder {
public View mainView { get; set; }
public string id { get; set; }
public string type { get; set; }
public ImageView image { get; set; }
// public TextView value { get; set; }
public TextView title { get; set; }
public ItemView(View view) : base(view) {
mainView = view;
}
}
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType) {
View itemLayoutView = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.DashboardItems, null);
CardView cardView = itemLayoutView.FindViewById<CardView>(Resource.Id.dashboard_card_view);
imageId = itemLayoutView.FindViewById<ImageView>(Resource.Id.sensor_image);
// sensorValue = itemLayoutView.FindViewById<TextView>(Resource.Id.sensor_value);
sensorTitle = itemLayoutView.FindViewById<TextView>(Resource.Id.sensor_title);
var viewHolder = new ItemView(itemLayoutView) {
id = sensorId,
type = sensorType,
image = imageId,
// value = sensorValue,
title = sensorTitle
};
return viewHolder;
}
public override void OnBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
ItemView itemHolder = viewHolder as ItemView;
itemHolder.image.SetImageDrawable(itemData[position].image);
if (itemData[position].type == "2") { // Temperature
itemHolder.title.Text = itemData[position].title + ": " + itemData[position].value;
} else {
itemHolder.title.Text = itemData[position].title;
}
var bundle = new Bundle();
var dualColumnList = new DualColumnList();
var gallery = new Gallery();
EventHandler clickUpdateViewEvent = ((sender, e) => {
bundle.PutString("id", itemData[position].id);
gallery.Arguments = bundle;
dualColumnList.Arguments = bundle;
if (itemData[position].type == "4") { // Camera
((FragmentActivity)activity).ShowFragment(gallery, itemData[position].title, itemData[position].type, true);
} else {
((FragmentActivity)activity).ShowFragment(dualColumnList, itemData[position].title, itemData[position].type, true);
}
});
itemHolder.image.Click += clickUpdateViewEvent;
// itemHolder.value.Click += clickUpdateViewEvent;
itemHolder.title.Click += clickUpdateViewEvent;
}
public override int ItemCount {
get { return itemData.Count; }
}
}
public class ItemData {
public string id { get; set; }
public string type { get; set; }
public Drawable image { get; set; }
public string value { get; set; }
public string title { get; set; }
}
}
}
fragment 布局:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/swipe_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:weightSum="1">
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.9"
android:scrollbars="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/dashboard_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<TextView
android:text="@string/no_data_text"
android:id="@+id/no_data_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="30sp"
android:gravity="center"
android:layout_centerInParent="true" />
</RelativeLayout>
</LinearLayout>
</android.support.v4.widget.SwipeRefreshLayout>
fragment 项目布局:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/dashboard_card_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical"
android:foreground="?android:attr/selectableItemBackground">
<ImageView
android:id="@+id/sensor_image"
android:layout_width="120dp"
android:layout_height="120dp"
android:paddingTop="5dp"
android:layout_alignParentTop="true" />
<!-- <TextView
android:id="@+id/sensor_value"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp"
android:layout_below="@id/sensor_image"
android:gravity="center" />-->
<TextView
android:id="@+id/sensor_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="23sp"
android:layout_below="@id/sensor_image"
android:gravity="center"
android:layout_alignParentBottom="true" />
</LinearLayout>
</android.support.v7.widget.CardView>
最佳答案
您可以计算可用的列数，给定所需的列宽，并按计算加载图像。定义一个静态函数来计算:
public class Utility {
public static int calculateNoOfColumns(Context context, float columnWidthDp) { // For example columnWidthdp=180
DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
float screenWidthDp = displayMetrics.widthPixels / displayMetrics.density;
int noOfColumns = (int) (screenWidthDp / columnWidthDp + 0.5); // +0.5 for correct rounding to int.
return noOfColumns;
}
}
然后在 Activity 或 fragment 中使用它时，您可以这样做:
int mNoOfColumns = Utility.calculateNoOfColumns(getApplicationContext());
............
mGridLayoutManager = new GridLayoutManager(this, mNoOfColumns);
关于android - GridLayoutManager - 如何自动调整列？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33575731/
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