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Android Facebook SDK: Check if the user is logged in or not

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问题 I'm have a feature on my Android app where the user authorizes the app and shares a link. I also need to give an option for the user to logout of facebook and I need to conditionally disable this button if the user is not logged int (or not authorized the app). I can't seem to find the API call on the Android SDK that would let me ask FB if the user is logged in or not. What I have found is getAccessExpires(): Retrieve the current session's expiration time (in milliseconds since Unix epoch),

Difference between OpenJDK and AdoptOpenJDK

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问题 Due to recent Oracle Java SE Support Roadmap policy update (end of $free release updates from Oracle after March 2019 in particular), I've been searching for alternatives to Oracle Java. I've found that OpenJDK is an open-source alternative. And I've found AdoptOpenJDK, which is a prebuilt binary . It puzzles. What is the difference between OpenJDK and AdoptOpenJDK? 回答1: In short: OpenJDK has multiple meanings and can be referred as: free and open source implementation of the Java Platform,

esp8266 rtos sdk编译后flash镜像构成

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 由于官方文件没有说明esp8266的启动特点，本文根据sdk内的flash map文档，sdk makefile, ld文件及flash image 生成的python脚本文件，简要分析esp8266的启动和运行，及flash镜像的构成特点。这里使用的sdk和编译时配置项见 esp8266 rtos sdk在小黄板上的使用 ##sdk生成的elf文件这里主要分析sdk根目录下的makefile文件就可以得到elf相关信息。在执行make前我们已经选择好编译的配置项，这里直接给出： boot=none app=0 freqdiv=0 mode=0 size_map=4 flash=4096 从makefile内可以分析到使用的ld文件是： LD_FILE = $(LDDIR)/eagle.app.v6.ld eagle.app.v6.ld可以看到 MEMORY { dport0_0_seg : org = 0x3FF00000, len = 0x10 dram0_0_seg : org = 0x3FFE8000, len = 0x14000 iram1_0_seg : org = 0x40100000, len = 0x8000 irom0_0_seg : org = 0x40240000, len =

Generate colorful QR code

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问题 I want to generate the colorful QR code. I had used https://github.com/kuapay/iOS-QR-Code-Generator code to generate the QR code. now the qr code generated is always n black color.I want to make it in Red or any other color. The coding of coloring And the drawing of QR code .png image is done QR_Draw_png.mm file. What should i edit in QR_Draw_png.mm this file. How to do the generate the colorful qr code. How is it possible. Please help me. 回答1: This is the best example to generate colorful QR

Generate colorful QR code

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Swift compatibility between versions for a library

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问题 I'm distributing libraries for other developers to use (http://empiric.al). I've noticed that between swift versions, even 2.0 to 2.1, I'll get Module file was created by a (newer/older) version of the compiler. I need to be distribute in a future-proof way. How can I make sure my compiled frameworks can be used by newer versions of Swift in the future so I don't have to recompile as soon as Apple puts a new beta out? 回答1: From Apple's website: Binary Compatibility and Frameworks While your

Cannot resolve symbol NameValuePair

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问题 In my project I got an error: Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Widget.Button.Inverse'. Then I tried to fix it use this: compileSdkVersion 23 But then I got error: cannot resolve symbol NameValuePair android How to fix this error? 回答1: NameValuePair is part the package org.apache which was deprecated with Android 22 and removed with Android M , which is the version against you are compiling. What is interesting is

Failure [INSTALL_FAILED_OLDER_SDK] Android Studio

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问题 I'm new to Android and I'm using the Android Studio. I've created a new project just to show the Hello World! but I can't get it working on the AVD because of this error: Failure [INSTALL_FAILED_OLDER_SDK]. I already searched for the answer and I know it's something about the build.gradle and the minSdkVersion but any of the answers worked for me. This is my AndroidManifest.xml : <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"

Checking for Power Saver Mode programmatically

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问题 I have written an app (AutoWifiSwitch) and one of the features I plan to add is automatically disabling the wifi scanning service in my app if power saving mode is enabled. I know Android L is supposed to have Battery Saving implemented (previously HTC and Samsung would add the features themselves to the software). Presumably this now means Google will have added some sort of API for it. Ideally there would be a new action added so I could listen for that. I would also like to know if the

Is there a way to detect if the Facebook Javascript SDK loaded successfully?

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问题 I use Facebook as the membership system of my website. It uses the code to generate a login control, allowing users to login via their facebook account. It's essentially one click if they're already a member, 2 if they're not (for granting permissions). I got a problem though... feedback is suggesting the login button isn't always loading correctly. Instead of loading the facebook login control, it simply states (in text) "login via facebook" - which is what the login button would say if the