Study note and activity record

  Java library has a built-in class java.util.zip.ZipFile and java.util.zip.ZipInputSteam. However, those class only can unzip files without a password.  For those zip files with password protected, we use 3rd party library Zip4j I have created a password protected zip file for testing. Structure like this. The name with ‘/’ is a directory. All files are photo in jpg format. Photo2/ 20190314_103435_HDR.jpg 20190314_112925_HDR.jpg 20190314_103702_HDR.jpg primary/ 20190316_121528_HDR.jpg secondary1/ 20190422_155924_HDR.jpg seconday2/ 20190314_103252_HDR.jpg  Test zip file download link: https://drive.google.com/uc?export=download&id=1XDMUGuvOPkTR2TH_Ikb5-2SIR7nXQ6yk Unzip password: aB3d Add dependency in the module gradle. implementation 'net.lingala.zip4j:zip4j:2.11.5' I have created a new module for this practice and copied the code used in the previous practice download file with Okhttp . Three buttons inside LinearLayout are added below the download progress bar. I ...

  Okhttp also can be used to download files from the internet to the app-specific storage . In this post, download progress is shown by the progress bar. The outcome can be viewed in this link . First, Internet permission is required in the manifest file <uses-permission android :name = "android.permission.INTERNET" /> Then we add the dependency of Okhttp in the module’s build.gradle file. The download process is done in coroutines so kotlinx-coroutines dependency also is required implementation 'com.squareup.okhttp3:okhttp:4.9.3' implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3' The developer of okhttp library has provided the example for download and get the progress in https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/Progress.java After studying the code, I implemented it in Kotlin and modified it a bit. A class is created to handle the download. The constructor has CoroutineScope and Prog...