我一直在搜索SO线程的答案,但无法从之前的讨论中找出我的问题.我有一个listview加载大约50个图像(它曾经是大约100个图像,但根本没有加载任何图像).从api端点获取我的JSON内容(包括图像URL)后,通过适配器,我的代码将其放入listview中.
目前,有50张图片,当我向下滚动Feed时,毕加索将一次加载一张图片.我觉得好像保持滚动固定在列表视图中的一个项目将使该图像加载更快.然而,当我向上滚动时,它会将占位符放回并重新加载图像.有没有办法解决这个问题？
public class MainActivity extends Activity {
private List<Post> myPosts = new ArrayList<Post>();
protected String[] mBlogPostTitles;
public static final String TAG = MainActivity.class.getSimpleName();//prints name of class without package name
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(isNetworkAvailable()) {
GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask(); // new thread
getBlogPostsTask.execute();// don't call do in background directly
}else{
Toast.makeText(this, "Network is unavailable", Toast.LENGTH_LONG).show();
}
}
public boolean isNetworkAvailable() {
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
boolean isAvailable = false; …我正在使用 puppeteer 进行一些轻量的爬行 ~2K 页面。但我不断看到这个错误再次出现
File "/env/local/lib/python3.7/site-packages/pyppeteer/execution_context.py", line 106, in evaluateHandle
'userGesture': True,
pyppeteer.errors.NetworkError: Protocol error (Runtime.callFunctionOn): Cannot find context with specified id
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
...
File "/user_code/main.py", line 434, in main_program
crawl_data = asyncio.get_event_loop().run_until_complete(crawl(browser, url))
File "/opt/python3.7/lib/python3.7/asyncio/base_events.py", line 573, in run_until_complete
return future.result()
File "/user_code/main.py", line 394, in crawl
title = await page.title()
File "/env/local/lib/python3.7/site-packages/pyppeteer/page.py", line 1437, in title
return await frame.title()
File "/env/local/lib/python3.7/site-packages/pyppeteer/frame_manager.py", line 752, in …我有一个从主文件调用的 config.py 模块，它有各种 app.configs 用于 jinja2filters 和我正在使用的其他一些插件：
config.py 的摘录：
from flask import current_app as app
#imports go here
def function1:
print("hello")
app.config['PROPERTY_1'] = 'configgoeshere'
#jinja2 functions and configs would go here like
app.jinja_env.filters['datetime'] = datetimeformat
从 index.py 调用：
from flask import Flask, flash, render_template, jsonify, request, json, request, redirect, url_for, Response, send_from_directory
app = Flask(__name__)
app.config['DEBUG'] = False
app.config.from_object('config') #config file
############################################################################################################################
# MAIN ROUTES
############################################################################################################################
# The route for the homepage
@app.route('/')
def index():
返回错误：
RuntimeError: working outside of …