Method of downloading files by multithreading in Android

This paper describes the method of multi-threaded file download for Android. Share with you for your reference. The details are as follows:

The general idea of multi-threaded download is to segment files through the range attribute, then read and write files with RandomAccessFile, and finally merge them into one file

First look at the renderings:

Create project threaddemo

First, the layout file threaddemo.xml

Main interface acitivity

Here, the startup thread divides the file into several parts, and each part starts a thread to download the data and download the file

Here, the seek method of RandomAccessFile is used to locate the corresponding location and record the download volume in real time. Of course, networking and SD card access are required, so corresponding permissions should be added

This is OK. Let's take a look at the problem of breakpoint continuation. To be tested~~

I hope this article will be helpful to your Android program design.