安卓9.0数据存储----＞打开读写权限

it2026-01-31 1

安卓9.0数据存储---->打开读写权限

一、在AndroidManifest.xml注册下面两条权限二、在 java中加入动态代码三、在onCreate中调用即可打开权限欢迎使用Markdown编辑器新的改变功能快捷键合理的创建标题，有助于目录的生成如何改变文本的样式插入链接与图片如何插入一段漂亮的代码片生成一个适合你的列表创建一个表格设定内容居中、居左、居右SmartyPants 创建一个自定义列表如何创建一个注脚注释也是必不可少的KaTeX数学公式新的甘特图功能，丰富你的文章UML 图表FLowchart流程图导出与导入导出导入

最近在开发安卓项目，关于I/O流文件的写入。写了代码，一步步进行调试，搞了好几天也没发现哪里出现了错误，最后发现安卓6.0版本以上的数据写入需要动态打开权限。

一、在AndroidManifest.xml注册下面两条权限

下面展示一些内联代码片。

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

二、在 java中加入动态代码

//申请授权文件写入 public static class PermissionUtils { private static String[] PERMISSIONS_CAMERA_AND_STORAGE = { Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA}; public static boolean isGrantExternalRW(Activity activity, int requestCode) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { int storagePermission = activity.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE); int cameraPermission = activity.checkSelfPermission(Manifest.permission.CAMERA); if (storagePermission != PackageManager.PERMISSION_GRANTED || cameraPermission != PackageManager.PERMISSION_GRANTED) { activity.requestPermissions(PERMISSIONS_CAMERA_AND_STORAGE, requestCode); return false; } } return true; } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { switch (requestCode) { case 1: if (grantResults[0] == PackageManager.PERMISSION_GRANTED) { //getData(AcRed,"rider.txt"); } else { runOnUiThread(new Runnable() { @SuppressLint("WrongConstant") @Override public void run() { Toast.makeText(getApplicationContext(), "您的手机暂不适配哦~",1).show(); } }); } break; } super.onRequestPermissionsResult(requestCode, permissions, grantResults); }

三、在onCreate中调用即可打开权限

PermissionUtils.isGrantExternalRW(MainActivity.this, 1);

这样就完美的实现了数据的读写，开发小白，，，希望读者少踩坑！！！本文参考链接: https://blog.csdn.net/qq_23335213/article/details/78081114.

欢迎使用Markdown编辑器

你好！这是你第一次使用 Markdown编辑器所展示的欢迎页。如果你想学习如何使用Markdown编辑器, 可以仔细阅读这篇文章，了解一下Markdown的基本语法知识。

新的改变

我们对Markdown编辑器进行了一些功能拓展与语法支持，除了标准的Markdown编辑器功能，我们增加了如下几点新功能，帮助你用它写博客：

全新的界面设计，将会带来全新的写作体验；在创作中心设置你喜爱的代码高亮样式，Markdown 将代码片显示选择的高亮样式进行展示；增加了图片拖拽功能，你可以将本地的图片直接拖拽到编辑区域直接展示；全新的 KaTeX数学公式语法；增加了支持甘特图的mermaid语法¹ 功能；增加了多屏幕编辑 Markdown文章功能；增加了焦点写作模式、预览模式、简洁写作模式、左右区域同步滚轮设置等功能，功能按钮位于编辑区域与预览区域中间；增加了检查列表功能。

功能快捷键

撤销：Ctrl/Command + Z 重做：Ctrl/Command + Y 加粗：Ctrl/Command + B 斜体：Ctrl/Command + I 标题：Ctrl/Command + Shift + H 无序列表：Ctrl/Command + Shift + U 有序列表：Ctrl/Command + Shift + O 检查列表：Ctrl/Command + Shift + C 插入代码：Ctrl/Command + Shift + K 插入链接：Ctrl/Command + Shift + L 插入图片：Ctrl/Command + Shift + G 查找：Ctrl/Command + F 替换：Ctrl/Command + G

合理的创建标题，有助于目录的生成

直接输入1次#，并按下space后，将生成1级标题。输入2次#，并按下space后，将生成2级标题。以此类推，我们支持6级标题。有助于使用TOC语法后生成一个完美的目录。

如何改变文本的样式

强调文本强调文本

加粗文本加粗文本

标记文本

删除文本

引用文本

H₂O is是液体。

2¹⁰ 运算结果是 1024.

插入链接与图片

链接: link.

图片:

带尺寸的图片:

居中的图片:

居中并且带尺寸的图片:

当然，我们为了让用户更加便捷，我们增加了图片拖拽功能。

如何插入一段漂亮的代码片

去博客设置页面，选择一款你喜欢的代码片高亮样式，下面展示同样高亮的代码片.

// An highlighted block var foo = 'bar';

生成一个适合你的列表

项目项目项目项目1项目2项目3 计划任务完成任务

创建一个表格

一个简单的表格是这么创建的：

项目Value电脑$1600手机$12导管$1

设定内容居中、居左、居右

使用:---------:居中使用:----------居左使用----------:居右

第一列第二列第三列第一列文本居中第二列文本居右第三列文本居左

SmartyPants

SmartyPants将ASCII标点字符转换为“智能”印刷标点HTML实体。例如：

TYPEASCIIHTMLSingle backticks'Isn't this fun?'‘Isn’t this fun?’Quotes"Isn't this fun?"“Isn’t this fun?”Dashes-- is en-dash, --- is em-dash– is en-dash, — is em-dash

创建一个自定义列表

Markdown Text-to- HTML conversion tool Authors John Luke

如何创建一个注脚

一个具有注脚的文本。²

注释也是必不可少的

Markdown将文本转换为 HTML。

KaTeX数学公式

您可以使用渲染LaTeX数学表达式 KaTeX:

Gamma公式展示 $\Gamma(n) = (n-1)!\quad\forall n\in\mathbb N$ 是通过欧拉积分

$\Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt\,.$

你可以找到更多关于的信息 LaTeX 数学表达式here.

新的甘特图功能，丰富你的文章

Mon 06 Mon 13 Mon 20 已完成进行中计划一计划二现有任务 Adding GANTT diagram functionality to mermaid 关于甘特图语法，参考这儿,

UML 图表

可以使用UML图表进行渲染。 Mermaid. 例如下面产生的一个序列图：

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span{color:#333}#mermaid-svg-7iE7HLD8tztvlcvg .cluster rect{fill:#ffffde;stroke:#aa3;stroke-width:1px}#mermaid-svg-7iE7HLD8tztvlcvg .cluster text{fill:#333}#mermaid-svg-7iE7HLD8tztvlcvg div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);font-size:12px;background:#ffffde;border:1px solid #aa3;border-radius:2px;pointer-events:none;z-index:100}#mermaid-svg-7iE7HLD8tztvlcvg .actor{stroke:#ccf;fill:#ECECFF}#mermaid-svg-7iE7HLD8tztvlcvg text.actor>tspan{fill:#000;stroke:none}#mermaid-svg-7iE7HLD8tztvlcvg .actor-line{stroke:grey}#mermaid-svg-7iE7HLD8tztvlcvg .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333}#mermaid-svg-7iE7HLD8tztvlcvg .messageLine1{stroke-width:1.5;stroke-dasharray:2, 2;stroke:#333}#mermaid-svg-7iE7HLD8tztvlcvg #arrowhead path{fill:#333;stroke:#333}#mermaid-svg-7iE7HLD8tztvlcvg .sequenceNumber{fill:#fff}#mermaid-svg-7iE7HLD8tztvlcvg #sequencenumber{fill:#333}#mermaid-svg-7iE7HLD8tztvlcvg #crosshead path{fill:#333;stroke:#333}#mermaid-svg-7iE7HLD8tztvlcvg .messageText{fill:#333;stroke:#333}#mermaid-svg-7iE7HLD8tztvlcvg .labelBox{stroke:#ccf;fill:#ECECFF}#mermaid-svg-7iE7HLD8tztvlcvg .labelText,#mermaid-svg-7iE7HLD8tztvlcvg .labelText>tspan{fill:#000;stroke:none}#mermaid-svg-7iE7HLD8tztvlcvg .loopText,#mermaid-svg-7iE7HLD8tztvlcvg .loopText>tspan{fill:#000;stroke:none}#mermaid-svg-7iE7HLD8tztvlcvg .loopLine{stroke-width:2px;stroke-dasharray:2, 2;stroke:#ccf;fill:#ccf}#mermaid-svg-7iE7HLD8tztvlcvg .note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-7iE7HLD8tztvlcvg .noteText,#mermaid-svg-7iE7HLD8tztvlcvg .noteText>tspan{fill:#000;stroke:none}#mermaid-svg-7iE7HLD8tztvlcvg .activation0{fill:#f4f4f4;stroke:#666}#mermaid-svg-7iE7HLD8tztvlcvg .activation1{fill:#f4f4f4;stroke:#666}#mermaid-svg-7iE7HLD8tztvlcvg .activation2{fill:#f4f4f4;stroke:#666}#mermaid-svg-7iE7HLD8tztvlcvg .mermaid-main-font{font-family:"trebuchet ms", 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.box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.7}#mermaid-svg-7iE7HLD8tztvlcvg .edgeLabel text{fill:#333}#mermaid-svg-7iE7HLD8tztvlcvg .stateLabel text{fill:#000;font-size:10px;font-weight:bold;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-7iE7HLD8tztvlcvg .node circle.state-start{fill:black;stroke:black}#mermaid-svg-7iE7HLD8tztvlcvg .node circle.state-end{fill:black;stroke:white;stroke-width:1.5}#mermaid-svg-7iE7HLD8tztvlcvg #statediagram-barbEnd{fill:#9370db}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-cluster rect{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-cluster rect.outer{rx:5px;ry:5px}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-state .divider{stroke:#9370db}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-state .title-state{rx:5px;ry:5px}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-cluster.statediagram-cluster .inner{fill:white}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-7iE7HLD8tztvlcvg .note-edge{stroke-dasharray:5}#mermaid-svg-7iE7HLD8tztvlcvg .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-7iE7HLD8tztvlcvg .error-icon{fill:#522}#mermaid-svg-7iE7HLD8tztvlcvg .error-text{fill:#522;stroke:#522}#mermaid-svg-7iE7HLD8tztvlcvg .edge-thickness-normal{stroke-width:2px}#mermaid-svg-7iE7HLD8tztvlcvg .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-7iE7HLD8tztvlcvg .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-7iE7HLD8tztvlcvg .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-7iE7HLD8tztvlcvg .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-7iE7HLD8tztvlcvg .marker{fill:#333}#mermaid-svg-7iE7HLD8tztvlcvg .marker.cross{stroke:#333} :root { --mermaid-font-family: "trebuchet ms", verdana, arial;} #mermaid-svg-7iE7HLD8tztvlcvg { color: rgba(0, 0, 0, 0.75); font: ; } 张三李四王五你好！李四, 最近怎么样? 你最近怎么样，王五？我很好，谢谢! 我很好，谢谢! 李四想了很长时间, 文字太长了不适合放在一行. 打量着王五... 很好... 王五, 你怎么样? 张三李四王五

这将产生一个流程图。:

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.box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.7}#mermaid-svg-k2MbIAH1JyZXrm6g .edgeLabel text{fill:#333}#mermaid-svg-k2MbIAH1JyZXrm6g .stateLabel text{fill:#000;font-size:10px;font-weight:bold;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-k2MbIAH1JyZXrm6g .node circle.state-start{fill:black;stroke:black}#mermaid-svg-k2MbIAH1JyZXrm6g .node circle.state-end{fill:black;stroke:white;stroke-width:1.5}#mermaid-svg-k2MbIAH1JyZXrm6g #statediagram-barbEnd{fill:#9370db}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-cluster rect{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-cluster rect.outer{rx:5px;ry:5px}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-state .divider{stroke:#9370db}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-state .title-state{rx:5px;ry:5px}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-cluster.statediagram-cluster .inner{fill:white}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-k2MbIAH1JyZXrm6g .note-edge{stroke-dasharray:5}#mermaid-svg-k2MbIAH1JyZXrm6g .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-k2MbIAH1JyZXrm6g .error-icon{fill:#522}#mermaid-svg-k2MbIAH1JyZXrm6g .error-text{fill:#522;stroke:#522}#mermaid-svg-k2MbIAH1JyZXrm6g .edge-thickness-normal{stroke-width:2px}#mermaid-svg-k2MbIAH1JyZXrm6g .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-k2MbIAH1JyZXrm6g .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-k2MbIAH1JyZXrm6g .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-k2MbIAH1JyZXrm6g .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-k2MbIAH1JyZXrm6g .marker{fill:#333}#mermaid-svg-k2MbIAH1JyZXrm6g .marker.cross{stroke:#333} :root { --mermaid-font-family: "trebuchet ms", verdana, arial;} #mermaid-svg-k2MbIAH1JyZXrm6g { color: rgba(0, 0, 0, 0.75); font: ; } 链接长方形圆圆角长方形菱形关于 Mermaid 语法，参考这儿,

FLowchart流程图

我们依旧会支持flowchart的流程图：

Created with Raphaël 2.2.0 开始我的操作确认？结束 yes no 关于 Flowchart流程图语法，参考这儿.

导出与导入

导出

如果你想尝试使用此编辑器, 你可以在此篇文章任意编辑。当你完成了一篇文章的写作, 在上方工具栏找到文章导出，生成一个.md文件或者.html文件进行本地保存。

导入

如果你想加载一篇你写过的.md文件，在上方工具栏可以选择导入功能进行对应扩展名的文件导入，继续你的创作。

mermaid语法说明 ↩︎

注脚的解释 ↩︎

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