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More than Hello World on Firebase - Why

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More than Hello World on Firebase - Why More than Hello World with Firebase - Why If you search about Firebase or are attracted by the title, I believe there is no need for me to introduce Firebase which has been explained well with its own documents. So let’s jump into the real stuff. Why Firebase Cheap or even free in early stage. Here, we are talking about in the early stage of a product. Mostly, we need faster prototyping at that moment. It requires more optimisations after product reach certain user base and, of course, we might need other tools other than Firebase to solve the problem. Easy development with the tools Firebase provides. It provides SDK for Android, iOS and Web and they are open sourced. From frontend development point of view, we can focus on real business problems we need to solve, but no need to struggle with some common parts, such as Auth , Crash report , Event tracking , Push notification , CDN , etc. Google’s service means we w
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A wired issue of MediaPlayer on Android

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Background Our application needs to play mp3 files served by our server. What we used to do is just using MediaPlayer to play that URL. However, there are more and more customers complaint about Music playing being cut off quite frequently. So I had to dig into legacy codes to find out the reason. Reproduce From existing codebase, I could tell our app respects MediaPlayer's   OnErrorListener   and if MediaPlay throw out any Error, app will try to catch them and recover. Unfortunately, we did not receive any exceptions for this part according to our Fabric crashlytics report. Besides that, this bug is not really easy to reproduce.   I knew it must be caused by user's network issue. So I tried Charles proxy and using its throttling feature. However it seems like MediaPlayer would have a special connection after connecting and Charles' throttling can not control that connection. Then I also tried Android Emulator's build-in network status simulation feature. Sti
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Gradle issue - peer not authenticated

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When we tried to migrate our Gitlab from Http to Https , we met a problem of Maven Central which was also maintained as a Git repo. peer not authenticated Basically the reason is JVM can not pick up trusted CA from local machine. So we manually trusted it with commands. 1. Get the certificate file (.cer). I am using Mac so I just trusted that certificate through browser and it will be saved in Keychain Access. Then I just export that certificate as .cer file. 2. Copy the .cer file to $JDK_HOME/jre/lib/security folder 3. Run the command keytool - import - alias <alias_of_this_cert> - file < cert_file_name_you_exported . cer > - keystore cacerts - storepass changeit 4. Gradle is able to find dependencies now. NOTE : how to get current JAVA_HOME: /usr/libexec/java_home [-v '1.8'] how to transfer file through ssh: cat {origin file} | ssh {username}@{remote host} "cat - > {target file}"
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how to set https ssl proxy for Android debuging with Charles

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http://jaanus.com/blog/2012/02/12/debugging-http-on-an-android-phone-or-tablet-with-charles-proxy-for-fun-and-profit/ 1. using Android default browser access  http://charlesproxy.com/charles.crt 2. in popup dialog type in the certificate name. I just name it "Charles" 3. open charles and set the android wifi using laptop or pc as proxy. 4. select the target ip as accepting ssl proxy.
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How to add pre-receive hook in GitLab

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Recently we decided to move our git repo to local git server so we chose GitLab. During weeks use GitLab it was really convenient. Until one day we have a thought about checking code style before push.  Basically Git support 2 kinds of hooks. One is Client side and the other is from Server side http://git-scm.com/book/en/Customizing-Git-Git-Hooks In terms of checking code style we can do both on Client and Server side.  However we want this rules be more STRICT :D, so we decided to make it from Server side . So here is problem! After investigation we found GitLab actually changed quite a lot from Gitorious. Especially Gitlab uses Gitlab-Shell to wrapper the Git commands. So when we found "Hooks" folder what we can get is like this:    ONLY ONE "UPDATE" . If you open it you will found quite simple codes:    So check GitlabUpdate in ../lib/  And if you change the codes to exit with "1", all the push request will be rejected. S
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How to write Gradle Plugins with Groovy for Android

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Since Android Studio being released,  I could always find that Google announce that Gradle is better than Maven and Ant. Especially it supports Groovy as script language natively. However I could not get chance to try it. Recently our project requires us to implement CI and something else. So I got chance to learn it more. Firstly I need to know how to create a customised Gradle Task using Groovy. I tried building some simple "Hello world " tasks inside of build.gradle file. They all work fine. But once I tried to implement some more complicated ones which needs importing some other libraries, it will complain can not import. So I recheck the doc from Gradle. There is another way to create a standalone plugin library. http://www.gradle.org/docs/current/userguide/custom_tasks.html So I followed the doc to create mine one. 1. Create Gradle project using Intellij 2. Add framework support -> Groovy 3. Create the source structure like this. 4. Change the bui
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Android how to keep the white space inside of string.xml file

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Quick solution for maintaining white space inside of string.xml file \u0020
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