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      "body": "Congratulations @samon! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@samon/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@samon) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=samon)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/steemfest/@steemitboard/steemitboard-supports-the-steemfest-travel-reimbursement-fund\"><img src=\"https://steemitimages.com/64x128/https://cdn.steemitimages.com/DQmXDHs9xfx8ZZ3DESFUqHRUQAcQT5kUWobArsRoJg2Yz1F/image.png\"></a></td><td><a href=\"https://steemit.com/steemfest/@steemitboard/steemitboard-supports-the-steemfest-travel-reimbursement-fund\">SteemitBoard supports the SteemFest⁴ Travel Reimbursement Fund.</a></td></tr></table>\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "body": "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;这两天开发遇到了一个比较诡异的问题，话不多数直接上图，看到那条多余的黑线了吧，只会在这一行出现。\n\nhttps://cdn.steemitimages.com/DQmNLhEJC4Pkz9khoudHA8CWY9rwBn2kPDLgcTmQCd5Pvdf/20181115211636.png)\n\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;当输入框EditText正好被输入法键盘弹出时覆盖一小部分底部时，会出现一条诡异的黑线，注意这可不是输入法的光标，开始以为是输入法的光标各种调试，各种不通，诡异的是只有这行会出现黑线，输入法键盘隐藏黑线消失，更诡异的是这么多测试机中只在Mate 9中出现，点开设置看下Mate 9的配置也算是中高端机了不至于。仔细检查出问题部分的代码,都是常规的设置没什么特别：\n\n<code>\n\n            <LinearLayout\n                android:layout_width=\"match_parent\"\n                android:layout_height=\"wrap_content\"\n                android:background=\"@color/white\"\n                android:orientation=\"horizontal\">\n\n                <TextView\n                    android:layout_width=\"match_parent\"\n                    android:layout_height=\"45dp\"\n                    android:layout_marginLeft=\"20dp\"\n                    android:layout_weight=\"2\"\n                    android:gravity=\"center_vertical\"\n                    android:text=\"手机号码  \"\n                    android:textColor=\"@color/black_text\"\n                    android:textSize=\"13sp\" />\n\n                <EditText\n                    android:id=\"@+id/xxxxxxxxxxx\"\n                    android:layout_width=\"match_parent\"\n                    android:layout_height=\"45dp\"\n                    android:layout_weight=\"1\"\n                    android:background=\"@color/white\"\n                    android:hint=\"请输入手机号码  \"\n                    android:textColor=\"@color/black_text\"\n                    android:textSize=\"13sp\" />\n            </LinearLayout>\n</code>\n\n&nbsp;&nbsp;&nbsp;&nbsp;中间折腾了输入法的光标半天，不见效果，实在想不通问题出在什么地方。后来无意中发现黑色的线明显比输入法光标要高，确定黑线不是光标。然后各种上网查，想到了TextView渲染问题，网上确实有人遇到类似问题：TextView更改宽度之后后面出现黑色条，重点是更改宽度。重新分析布局横向的LinearLayout里面就一个TextView和EditText，各自按照2：1布局，主要是EditText当触发焦点被选中时，猜测周围的选中效果一般为一圈黄色，会造成EditText在宽度和高度上的变化，虽然变化很小，这样间接会造成权重重新分配TextView宽度发生变化，最终引起TextView重绘，造成了渲染问题出现黑线。\n&nbsp;&nbsp;&nbsp;&nbsp;解决方法有两个，一个是固定TextView的高和宽，这个方法在目前这种布局明显不适合，第二种尝试给TextView设置背景色android:background=\"@color/white\"，试了下诡异的黑线终于消失了，具体原因还有待深入源码研究。\n\n<code>\n\n                <TextView\n                        android:layout_width=\"match_parent\"\n                        android:layout_height=\"45dp\"\n                        android:layout_marginLeft=\"20dp\"\n                        android:layout_weight=\"2\"\n                        android:gravity=\"center_vertical\"\n                        android:background=\"@color/white\"  设置背景色白色\n                        android:text=\"手机号码  \"\n                        android:textColor=\"@color/black_text\"\n                        android:textSize=\"13sp\" />\n\n</code>",
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      "body": "作为一名程序员怎么可以不 reading the source code ，工欲善其事必先利其器，想要阅读先下载下来再说，下面就介绍下如何在Ubantu18.04环境下下载android-8.1.0_r48源码。\n<h4>一、 git的安装和配置</h4>\n          Ubantu18.04下进入终端输入以下命令\n安装git命令\n<code>sudo apt-get install git</code>\n![20181028112724.png](https://cdn.steemitimages.com/DQmXC2QHKqfsEfq5VzgQ8BrY7zvauWoqbTK97yeF5n51Cvf/20181028112724.png)\n配置git的用户名user.name\n<code>git config --global user.name \"first name\"</code>\n配置git的邮箱地址user.email\n<code>git config --global user.email \"[email protected]\"</code>\n![20181028113322.png](https://cdn.steemitimages.com/DQmQ5BFj14Wrzx4ASeGrp7JPcJHrpasDLEQ6J8kiZJbzDAc/20181028113322.png)\n<h4>二、 repo的安装和配置</h4>\n国内的话强烈建议使用镜像https://aosp.tuna.tsinghua.edu.cn/来安装，repo安装命令：\n<code>git clone https://aosp.tuna.tsinghua.edu.cn/git-repo/</code>\n<code>chmod a+x git-repo/repo</code>\n安装完毕需要将repo添加到PATH环境变量，repo配置命令：\n<code>export PATH=~/git-repo:$PATH</code>\n<h4>三、 特别设置，由于有墙防止出现unable to access'':Failed to connect to...问题 </h4>\n<h5>1. .bashrc文件设置</h5>\n在Ubantu<主文件夹>下设置显示隐藏文件找到并打开 .bashrc 文件，添加如下内容\n<code>export REPO_URL=’https://mirrors.tuna.tsinghua.edu.cn/git/git-repo/’</code>\n然后执行如下命令\n<code>echo \" export REPO_URL='https://mirrors.tuna.tsinghua.edu.cn/git/git-repo/' \">> ~/.bashrc</code>\n![20181028150644.png](https://cdn.steemitimages.com/DQmV8fe99R41AvhAsAjJdcnn6CCz7nJrxnSzdopKYi24ED3/20181028150644.png)\n<h5>2. repo文件设置</h5>\n在 主文件夹->bin->repo 中找到并打开repo文件，搜索REPO_URL将地址修改为镜像地址\n<code>REPO_URL = 'https://gerrit-google.tuna.tsinghua.edu.cn/git-repo'</code>\n![20181028133351.png](https://cdn.steemitimages.com/DQmdaRRWcawGWNXpS43Rk2ec5wL9QqCh4u1EhNkwZas8UDB/20181028133351.png)\n<h4>四、查看可下载的android源码分支</h4>\n开始前最好在主文件下新建用于保存android源码的文件夹，比如我的是<主文件夹>/Android/source，在终端中cd进入到此文件夹下执行命令\n<code>repo init -u https://aosp.tuna.tsinghua.edu.cn/platform/manifest</code>\n![20181028152709.png](https://cdn.steemitimages.com/DQmXu9VH833fhuS7kV9ASugDUiTsu7466PK64m8Cqx28y3y/20181028152709.png)\n稍等片刻，打开文件进入该目录下看到创建了.repo文件夹，进入看到还创建了manifests、manifests.git等文件\n![20181028152812.png](https://cdn.steemitimages.com/DQmehqt5ENJw8Q9o9D3U2Z9r7pqHmJfj4G7FhzsFQTA1qhg/20181028152812.png)\n相关文件拉取到本地后就可以在终端下进入manifests.git文件夹下，执行命令\n<code>cd .repo/manifests.git/</code>\n<code>git branch -a</code>\n\n![20181028152957.png](https://cdn.steemitimages.com/DQmcK1zajWjZvr6ZhYnpGVsFmE4tXrPep9bFv4TCbSgboiR/20181028152957.png)\n稍等片刻，终端可以查看可拉取的源码分支\n![20181028153332.png](https://cdn.steemitimages.com/DQmUSVbJ5RyJ6eAfLQMEnSQs65Xecqojfsa28jgfQvFHQkj/20181028153332.png)\n<h4>五、下载android源码到本地</h4>\n这里我们选择android8.1.0的最高版本android-8.1.0_r48，终端下执行命令\n<code>repo init -u https://aosp.tuna.tsinghua.edu.cn/platform/manifest -b android-8.1.0_r48</code>\n<code>repo sync</code>\n![20181028153902.png](https://cdn.steemitimages.com/DQmNiNbAo6c8kZHYkU6DUUKEXCw2qiKwf3vn1DaiNihwFWY/20181028153902.png)\n下面就是考验网速的时刻了，可能需要花费小半天时间，可以去\n<code>have a coffee and take a rest.</code>",
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      "permlink": "win10-hyper-v-ubantu18-04",
      "title": "在win10下使用Hyper-V安装Ubantu18.04虚拟机",
      "body": "<h5> Ubantu下载</h5> \n进入Ubantu官网https://www.ubuntu.com/global 下载目前最新版本的Ubantu还是选择长期支持版比较好，这里是Ubuntu 18.04.1 LTS![1.png](https://cdn.steemitimages.com/DQmP3Tin6PypaLBCxzjYMYXoXZeauvoEYdB1qnXRLwmF5Gn/1.png)\n<h5>配置Hyper-v</h5>\n打开Hyper-v配置，全部勾选点确定完成安装\n![2.png](https://cdn.steemitimages.com/DQmWSqt9NyV7BWZbbDNRN8YXafrX5tZxk2NTAiF4zY8nQ2T/2.png)\n<h5>创建虚拟机</h5>\n打开Hyper-V 管理器，创建虚拟机\n![4.png](https://cdn.steemitimages.com/DQmSdyymsL7FSHnX7zyaXsJfgWNg4Q72FSGKUucitXd1Yof/4.png)\n按照提示下一步，选择Ubantu安装的位置输入名字如Ubantu18.04，进入下一步\n![QQ截图20181026203212.png](https://cdn.steemitimages.com/DQmeFKiY2y7msDvVUqouwJM3SJAjnBWCUuS5AXEXZ6rTrXn/QQ%E6%88%AA%E5%9B%BE20181026203212.png)\n选择默认的第一代虚拟机\n![20181026203221.png](https://cdn.steemitimages.com/DQmaKHZL3YXanwcRyJxhCp6xnCo8D2w2xEXcN84So7SCNqH/20181026203221.png)\n根据自己主机内存的大小给虚拟机分配内存，比如我的是16G给虚拟机分配3G\n![20181026203413.png](https://cdn.steemitimages.com/DQmNNatxugrdkgD4vwHCnQaEHRsuLW6qXTzLNzjt7RyLdCv/20181026203413.png)\n选择网络连接，这里可以回到Hyper-V 管理器创建一个虚拟网络适配器![20181026203741.png](https://cdn.steemitimages.com/DQmT59Cm9jGM8fd7EPfHLQg7SbHtM4GnTcPQPD3Uqhwer3u/20181026203741.png)\n根据自己不同盘符的大小给虚拟机分配虚拟硬盘大小，比如我的是127G\n![20181026204145.png](https://cdn.steemitimages.com/DQmW1MNgN6b7nsBZhWhFwrUAXrmQd7XoXHo4jRFyHCyzbxG/20181026204145.png)\n按照提示下一步完成虚拟机创建\n<h5>启动虚拟机Ubantu18.04</h5>\n![open.png](https://cdn.steemitimages.com/DQmWZ91MKyMs5A8Rqxazmc6Fpy85jtFZkWe6eeUQo6QXaJm/open.png)\n<h5>Ubantu启动安装设置</h5>\nUbantu的安装不需要详细介绍了，至此可以在Ubantu18.04上愉快的开发了。\n![20181026204747.png](https://cdn.steemitimages.com/DQmeejAUnjJgzybrEvb2dBisPq8VPAuJEaBAYoCASQb9Aoo/20181026204747.png)\n![20181026205152.png](https://cdn.steemitimages.com/DQmWQ81yQJHXKnY5LMqUomSDdMrQxhmYz1o5gtiiXZ66U5i/20181026205152.png)\n![20181026210509.png](https://cdn.steemitimages.com/DQmZRwaESQg3LUhh4pGn4r6stfU4jZ8y3WsJgLC6Rouoi8o/20181026210509.png)",
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      "author": "samon",
      "permlink": "android-integer-double",
      "title": "Android开发中遇到的integer比较和double加和的问题",
      "body": "        这两天在开发中遇到了两个比较经典的问题，虽然都是基础的东西，但越是基础的我们有时反而没有把它弄清楚，值得记一下：\n#####1、使用==比较Integer的误区\n\n        对于Integer平时经常用算是十分熟悉了，但是比较两个Integer的大小是不能用==的，Integer是对象类型，特殊情况是当数值在-128到127之间时是可以进行比较的，原因是java为了提升性能和节省内存，好像是JDK在1.5版本中把-128到127之间的数字做了缓存，在这范围内的数值如果使用Integer.valueOf()方法的话自动装箱都是从缓存中获取的，返回的是同一个数字，但是如果是调用new Integer()的话是不会从缓存中取的，还有就是如果超过边界的话同样也是不等的。\n\n```java\n\n    @Test\n    public void testInteger() {\n        Integer a127 = 127;\n        Integer b127 = 127;\n        Integer a128 = 128;\n        Integer b128 = 128;\n\n        System.out.println(\"a127 == b127 -> \" + (a127 == b127));  //结果返回 true\n        System.out.println(\"a128 == b128 -> \" + (a128 == b128));  //结果返回 false\n    }\n\n\n```\n\n\n        与Integet联系最近的是int，int作为java的原始数据类型之一，其封装类正是Integer,需要补充一点的是当int和Integer比较时，是不会出问题的，因为Integer会自动拆箱为int，相当于int和int作比较。\n\n\n#####2、两个、多个double类型求和问题\n\n        当使用double类型进行运算时会发生精度丢失的问题，这也是一个基础常见却容易被忽视的问题。先看例子\n\n\n```java\n\n    @Test\n    public void  testDouble(){\n        double a = 1.13;\n        double b = 1.14;\n\n        System.out.println(a+b);  //结果是2.2699999999999996\n        System.out.println(a+a);  //结果是2.26\n        System.out.println(b+b);  //结果是2.28\n    }\t\n\n```\n\n        原因是因为double数值在求和或做减法的时候，需要将数值转换为二进制的数值，在转换过程中，存储小数部分的位数会有不够的现象，也就是无限循环小数，这就会造成微差。解决方法其实也很简单使用BigDecimal对象：\n\n\n```java\n\n    public BigDecimal add(double d1, double d2) {\n        BigDecimal bd1=new BigDecimal(Double.toString(d1));\n        BigDecimal bd2 = new BigDecimal(Double.toString(d2));\n        return bd1.add(bd2);\n    }\t\n\n```",
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      "permlink": "re-retrofit-okhttp-fatal-exception-okhttp-dispatcher-20180926t105004",
      "title": "",
      "body": "This post has been upvoted for free by @millibot with 5%! \n Get better upvotes by bidding on me.\nMore profits? 100% Payout! Delegate some SteemPower to @millibot:  [1 SP](https://v2.steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=millibot&vesting_shares=2049%20VESTS), [5 SP](https://v2.steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=millibot&vesting_shares=10245%20VESTS), [10 SP](https://v2.steemconnect.com/sign/delegateVestingShares?delegator=&delegatee=millibot&vesting_shares=20489%20VESTS), [custom amount](https://steembottracker.com/delegation.html)\nYou like to bet and win 20x your bid? Have a look at @gtw and [this description](https://steemit.com/guessthewitness/@isnochys/guess-the-witness-steemdice-for-witnesses)!",
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      "author": "samon",
      "permlink": "retrofit-okhttp-fatal-exception-okhttp-dispatcher",
      "title": "Retrofit + okHttp使用中遇到的FATAL EXCEPTION: OkHttp Dispatcher问题",
      "body": "前几天使用retrofit + okHttp 时出现一个问题，大致情况是使用okHttp上传视频文件时app闪退,错误如下：\n\n```java \n \nFATAL EXCEPTION: OkHttp Dispatcher\n\nProcess: com.******.******.******, PID: 26206\njava.lang.OutOfMemoryError: Failed to allocate a 144207294 byte allocation with 16765168 free bytes and 109MB until OOM\n   at java.lang.StringFactory.newStringFromBytes(StringFactory.java:79)\n   at java.lang.StringFactory.newStringFromBytes(StringFactory.java:207)\n   at okio.Buffer.readString(Buffer.java:616)\n   at okio.Buffer.readString(Buffer.java:599)\n   at okhttp3.logging.HttpLoggingInterceptor.intercept(HttpLoggingInterceptor.java:199)\n   at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)\n   at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)\n   at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:170)\n   at okhttp3.RealCall.access$100(RealCall.java:33)\n   at okhttp3.RealCall$AsyncCall.execute(RealCall.java:120)\n   at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)\n   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)\n   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)\n```\n\n        开始因为下面还有 OutOfMemoryError 的错，怀疑是视频有问题检查，视频文件正常大小有110M，虽然大点但不应该有问题，后来定位到自定义的okHttpClient配置的log拦截器处报错:\n\n```java\n    \n//新建log拦截器\n\n        HttpLoggingInterceptor loggingInterceptor=new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() {\n            @Override\n            public void log(String message) {\n                try {\n                    L.w(\"屏幕修复api\",\" \"+message); //报错处\n                } catch (Exception e) {\n                    e.printStackTrace();\n                    L.w(\"屏幕修复api  Exception\",e.toString());\n                }\n\n            }\n        });\n```\n\n        try{}catch()是调试的时候加的，即使加上try{}catch()仍然报错，所以说HttpLoggingInterceptor内部的错，于是各种查资料，类似情况还真有比较普遍原因是:\n\n```java\nString data=response.body().string();\n//.string()方法使用次数超过了一次。没错，你只能使用一次，至于原因看下面的源码分析。\n\n//所以讲Log.d(“xx”,response.body().string());果断的注释掉吧。\n```\n        感觉上面的错误只是方法调用有问题，不是真正的原因，继续查找,最后在Github okHttp的源码issues中找到这个[cancel a async call will cause FATAL EXCEPTION #1049](https://github.com/square/okhttp/issues/1049),源码作者之一在issues下说：We are seeing this issue too when we call cancel operation.当 call cancel operation 时会发生这个错误，至此问题算是清楚了。\n\n总结：我的代码引起这个错的原因不值一提，是在上传文件时同时传有其他参数，那个参数不符合服务器要求，所以服务器不接收request（文件、参数1、参数2...），那么app这边就会 call cancel operation 引起了app闪退，算是okhttp的一个bug，作者最后也说了：I was hoping if we could either catch that exception properly, or find a way to neglect that issue ?所以这个bug不会被catch到，我们更拿不到这个错误，也就无法处理，app就直接闪退了。",
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