本文将带您了解关于在iOSCarplay中延迟加载数据的新内容，同时我们还将为您解释applecarplay延迟的相关知识，另外，我们还将为您提供关于ajax延迟加载数据、android–在ListV

本文将带您了解关于在iOS Carplay中延迟加载数据的新内容，同时我们还将为您解释apple carplay延迟的相关知识，另外，我们还将为您提供关于ajax延迟加载数据、android – 在ListView中延迟加载图像、angular – 如何在延迟加载的模块中提供服务,并将该服务限定为延迟加载的模块及其组件？、angularjs – 在Angular中为ng-include延迟加载数据的首选方法是什么？的实用信息。

• 在iOS Carplay中延迟加载数据（apple carplay延迟）
• ajax延迟加载数据
• android – 在ListView中延迟加载图像
• angular – 如何在延迟加载的模块中提供服务,并将该服务限定为延迟加载的模块及其组件？
• angularjs – 在Angular中为ng-include延迟加载数据的首选方法是什么？

在iOS Carplay中延迟加载数据（apple carplay延迟）

用户在Carplay中滚动时如何延迟加载项目？

我正在使用MPPlayableContentDataSource中的beginLoadingChildItems加载
第一组项目，但是当用户滚动到
页面底部时如何调用下一页？

答案1

The way you can achieve this is inside the following function:

func beginLoadingChildItems(at indexPath: IndexPath, completionHandler: @escaping (Error?) -> Void)

As Example:

if (indexPath[componentIndex] + 1) % Threshold == 0 { // Threshold is Your Defined Batch Size    // Load the next corresponding batch}

Load your lazy data, then call:

completionHandler(nil) // In case of no error has occurred

,but firstly, you need to return the total items count correctly in the
following function:

func numberOfChildItems(at indexPath: IndexPath) -> Int

Something like the below,

class YourDataSource : MPPlayableContentDataSource {    private var items = [MPContentItem]()    private var currentBatch = 0    func beginLoadingChildItems(at indexPath: IndexPath, completionHandler: @escaping (Error?) -> Void) {        // indexPath[1]: is current list level, as per CarPlay list indexing (It''s an array of the indices as ex: indexPath = [0,1] means Index 0 in the first level and index 1 at the second level).        // % 8: Means each 8 items, I will perform the corresponding action.       // currentBatch + 1 == nextBatch, This check in order to ensure that you load the batches in their sequences.        let currentCount = indexPath[1] + 1        let nextBatch = (currentCount / 8) + 1        if currentCount % 8 == 0 && currentBatch + 1 == nextBatch {            // Load the next corresponding batch             YourAPIHandler.asyncCall { newItems in                self.currentBatch = self.currentBatch + 1                items.append(newItems)                completionHandler(nil)                MPPlayableContentManager.shared().reloadData()            }        } else {            completionHandler(nil)        }    }}func numberOfChildItems(at indexPath: IndexPath) -> Int {    return self.items.count}

ajax延迟加载数据

接收返回的json数据，触发了滚动事件之后，开始取出数据

$(window).scroll(function(){
		$('#text').val($(document).scrollTop());
		//如果滚动到下面的时候，触发ajax事件获取数据，显示在页面上。
		if($(document).scrollTop() > $(window).height()){
			$.ajax({
				type : 'POST',url : ThinkPHP['ROOT'] + '/Index/getBottomPic',dataType: 'json',success: function(data,textStatus,jqXHR){
					console.log(data.pic2);
					var pichtml = '';
					var pichtm2 = '';
					var i = 1; var j = 1;
					//第一个选项卡的内容
					$(data.pic1).each(function(k,v){
						pichtml += "<a><div><img src= '"+v.img_url+"' /></div><div><b>"+v.title+"</b></div></a>";						
						i++;
					});
					$('#pic1').append(pichtml);
					//第二个选项卡的内容
					$(data.pic2).each(function(k,v){
						pichtm2 += "<a><div><img src= '"+v.img_url+"' /></div><div><b>"+v.title+"</b></div></a>";						
						j++;
					});
					$('#pic2').append(pichtm2);
				}
			});
			$(window).unbind("scroll");
		}
	});

android – 在ListView中延迟加载图像

我使用ListView来显示与这些图像相关的一些图像和标题.我从互联网上获取图像.有没有办法延迟加载图像,以便文本显示时,UI不会被锁定,图像会在下载时显示？

图像总数不固定.

解决方法:

这是我创建的用于保存我的应用当前正在显示的图像的内容.请注意,这里使用的“Log”对象是围绕Android内部最终Log类的自定义包装器.

package com.wilson.android.library;

/*
 Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
*/
import java.io.IOException;

public class DrawableManager {
    private final Map<String, Drawable> drawableMap;

    public DrawableManager() {
        drawableMap = new HashMap<String, Drawable>();
    }

    public Drawable fetchDrawable(String urlString) {
        if (drawableMap.containsKey(urlString)) {
            return drawableMap.get(urlString);
        }

        Log.d(this.getClass().getSimpleName(), "image url:" + urlString);
        try {
            InputStream is = fetch(urlString);
            Drawable drawable = Drawable.createFromStream(is, "src");


            if (drawable != null) {
                drawableMap.put(urlString, drawable);
                Log.d(this.getClass().getSimpleName(), "got a thumbnail drawable: " + drawable.getBounds() + ", "
                        + drawable.getIntrinsicHeight() + "," + drawable.getIntrinsicWidth() + ", "
                        + drawable.getMinimumHeight() + "," + drawable.getMinimumWidth());
            } else {
              Log.w(this.getClass().getSimpleName(), "Could not get thumbnail");
            }

            return drawable;
        } catch (MalformedURLException e) {
            Log.e(this.getClass().getSimpleName(), "fetchDrawable Failed", e);
            return null;
        } catch (IOException e) {
            Log.e(this.getClass().getSimpleName(), "fetchDrawable Failed", e);
            return null;
        }
    }

    public void fetchDrawableOnThread(final String urlString, final ImageView imageView) {
        if (drawableMap.containsKey(urlString)) {
            imageView.setimageDrawable(drawableMap.get(urlString));
        }

        final Handler handler = new Handler() {
            @Override
            public void handleMessage(Message message) {
                imageView.setimageDrawable((Drawable) message.obj);
            }
        };

        Thread thread = new Thread() {
            @Override
            public void run() {
                //Todo : set imageView to a "pending" image
                Drawable drawable = fetchDrawable(urlString);
                Message message = handler.obtainMessage(1, drawable);
                handler.sendMessage(message);
            }
        };
        thread.start();
    }

    private InputStream fetch(String urlString) throws MalformedURLException, IOException {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet request = new HttpGet(urlString);
        HttpResponse response = httpClient.execute(request);
        return response.getEntity().getContent();
    }
}

angular – 如何在延迟加载的模块中提供服务,并将该服务限定为延迟加载的模块及其组件？

import { CommonModule } from '@angular/common';
import { NgModule } from '@angular/core';
import { Component1 } from './component1.component';
import { Component2 } from './component2.component';
import { LazyModuleService } from './lazy-module.service';

@NgModule({
  imports: [
    CommonModule,],declarations: [
    Component1,Component2,})

export class LazyLoadedModule { }

angularjs – 在Angular中为ng-include延迟加载数据的首选方法是什么？

<div ng-include="'/Customer/View'"></div>

<div ng-repeat="item in items" ng-click="url = item">
    <span ng-hide="url">Click to load</span>
    <span ng-show="url">Loaded item {{url}}</span>
    <div ng-include="url"></div>
</div>

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