DownloadManager | DownloadManager实现版本更新，监听下载进度，下载完成自动安装，拿来即用
kandi X-RAY | DownloadManager Summary
kandi X-RAY | DownloadManager Summary
DownloadManager简介 DownloadManager是Android 2.3（API level 9）用系统服务(Service)的方式提供了DownloadManager来处理长时间的下载操作。它包含两个静态内部类DownloadManager.Query(用来查询下载信息)和DownloadManager.Request(用来请求一个下载)。 DownloadManager主要提供了下面几个方法： **public long enqueue(Request request)**把任务加入下载队列并返回downloadId，以便后面用于查询下载信息。若网络不满足条件、Sdcard挂载中、超过最大并发数等异常会等待下载，正常则直接下载。 **public int remove(long… ids)**删除下载，若取消下载，会同时删除下载文件和记录。 **public Cursor query(Query query)**查询下载信息，包括下载文件总大小，已经下载的大小以及下载状态等。. ContentObserver简介 public void ContentObserver(Handler handler) 所有ContentObserver的派生类都需要调用该构造方法，参数：handler Handler对象用于在主线程中修改UI。 **public void onChange(boolean selfChange)**当观察到的Uri中内容发生变化时，就会回调该方法。所有ContentObserver的派生类都需要重载该方法去处理逻辑。 观察特定Uri的步骤如下： 1、创建我们特定的ContentObserver派生类，必须重载父类构造方法，必须重载onChange()方法去处理回调后的功能实现。 2、为指定的Uri注册一个ContentObserver派生类实例，当给定的Uri发生改变时，回调该实例对象去处理，调用registerContentObserver()方法去注册内容观察者。 3、由于ContentObserver的生命周期不同步于Activity和Service等。因此，在不需要时，需要手动的调用unregisterContentObserver()注销内容观察者。.
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Top functions reviewed by kandi - BETA
- Get the signatures for the APK
- To chars string
- Load certificates
- On bind url
- Register broadcast broadcast broadcast
- Download apk from url
- Region Draws
- Calculate the width and height of the view
- Restore the state from the Bundle
- Initializes the paints
- Called when the activity is created
- Remove apk
- Install apk
- Cleanup resources
- Checks if the application is background
- Get UninstallAPK signatures
- Get apk source directory
- Checks if the application is running
- Get apk sign signature
- Get application name
- Put object into SharedPreferences
- Saves the instance state
- Get value from key
DownloadManager Key Features
DownloadManager Examples and Code Snippets
Community Discussions
Trending Discussions on DownloadManager
QUESTION
In a singleton class I am trying the following code with 3 URLs stored in a dictionary:
...ANSWER
Answered 2021-Jun-13 at 10:59urls is actually of type [String: URL?]. Note that the value type is optional, because URL.init(string:) is failable.
When you try to get a value from this dictionary, you get a URL??. The guard only unwraps one layer of the optional.
One way to unwrap a nested optional (no matter how many layers), is to use as?:
QUESTION
I am trying to download my mp3 file and want to save it to internal storage at a specific location.
But every time my download is failing.
...Logcat error message
ANSWER
Answered 2021-Jun-11 at 11:20change your code to this
QUESTION
I want to download some audio files from the internet. I want to use downloadmanager to download this file but I don't know how to save these files to a specific internal storage location in android. InternalStorage/folder/filename.mp3 (so I can access them easily).
ANSWER
Answered 2021-Jun-10 at 18:23Check the request.setDestination functions here To Store file in External App-Specific Directory [example: "external/Android/data/your_app_name/filePath_you_set_in_function”], use like below:
QUESTION
The WebView Code
...ANSWER
Answered 2021-May-30 at 13:47The problem is that the Webview (ModalView) assigns its own parent. This is a feature of the ModalView. By returning a Webview instance in your build() method, you are attempting to set the App as the parent of the Webview. That causes the error you are seeing. You can solve this by returning something other than a Webview:
QUESTION
I am getting java.io.FileNotFoundException error while trying to download video from youtube using android-youtubeextrator lib. Full error code:
...ANSWER
Answered 2021-May-21 at 16:03you can track the same issue on the Lib From Github
for sample answer from there:
QUESTION
Being a Swift newbie I am trying to fetch a list of JSON objects, save them to Core Data, then display in a SwiftUI List:
The JSON objects have a unique numeric uid (acting as PRIMARY KEY in my PostgreSQL backend).
I map them to id in my TopModel.swift:
ANSWER
Answered 2021-May-16 at 17:39In Core Data you have to check if the entry already exists, create a predicate and fetch the objects with the unique id. If there is no item create one.
QUESTION
I am unable to create a folder in my Android 11 device using java. I used this piece of code
...ANSWER
Answered 2021-May-05 at 09:08are you check storage permission in runtime? here is the api 30 storage access that google changed in android 11:
QUESTION
I need to download multiple images, and after all downloads are completed (outside of the Main Thread), perform other actions in the activity.
I am currently using Glide to download as follows:
ImageDownloader.kt
...ANSWER
Answered 2021-Mar-21 at 08:50The first, crucial step is to adapt the async Glide request into a suspend fun using suspendCancellableCoroutine. Here's how:
QUESTION
I'm using this code to download videos:
...ANSWER
Answered 2021-Mar-12 at 12:47val file = File(Environment.DIRECTORY_PICTURES + "/appName/example.mp4")
That should be:
QUESTION
I'm using this code to download videos:
...ANSWER
Answered 2021-Mar-11 at 21:18This is the solution:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install DownloadManager
You can use DownloadManager like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the DownloadManager component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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