android 分享文件功能实现

Android面试题总结：
Android所有面试题总结
https://blog.csdn.net/gongjdde/category_11520676.html

Framework相关内容总结：

https://blog.csdn.net/gongjdde/category_10613658.html

Kotlin相关内容总结：

https://blog.csdn.net/gongjdde/category_10998720.html

分享功能原理是通过Intent将文件传给其他应用，代码如下：

public static void shareFile(Context context, String  fileName) {
        File file = new File(fileName);
        if (null != file && file.exists()) {
            Intent share = new Intent(Intent.ACTION_SEND);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                Uri contentUri = FileProvider.getUriForFile(context, BuildConfig.APPLICATION_ID + ".fileprovider",file);
                share.putExtra(Intent.EXTRA_STREAM, contentUri);
                share.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            } else {
                share.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
            }
            share.setType("application/vnd.ms-excel");//此处可发送多种文件
            share.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            share.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            context.startActivity(Intent.createChooser(share, "分享文件"));
        } else {
            Toast.makeText(context, "分享文件不存在", Toast.LENGTH_SHORT).show();
        }
    }

如上所示是分享excel表格的代码，其中7.0以上做特殊处理，需要包裹uri，并且需要添加xml文件，如下所示：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- apk存放路径:getExternalCacheDir()/apk/xiaomaigui.apk -->
    <root-path name="root" path="system"/>
    <!--
        如下路径是在：SDCard/Record/下面的文件
    -->
    <external-path
            name="Record"
            path="Record"/>
</paths>

在AndroidManifest中的Application添加xml文件：

<provider
                android:name="androidx.core.content.FileProvider"
                android:authorities="com.example.handscanner.fileprovider"
                android:exported="false"
                android:grantUriPermissions="true">
            <meta-data
                    android:name="android.support.FILE_PROVIDER_PATHS"
                    android:resource="@xml/file_paths" />
        </provider>

以上，即可完成分享excel表格的功能，如需分享其他文件，需要找到对应文件类型，如下是所有文件的类型：

            {".3gp",    "video/3gpp"},   
            {".apk",    "application/vnd.android.package-archive"},   
            {".asf",    "video/x-ms-asf"},   
            {".avi",    "video/x-msvideo"},   
            {".bin",    "application/octet-stream"},   
            {".bmp",    "image/bmp"},   
            {".c",  "text/plain"},   
            {".class",  "application/octet-stream"},   
            {".conf",   "text/plain"},   
            {".cpp",    "text/plain"},   
            {".doc",    "application/msword"},   
            {".docx",   "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},   
            {".xls",    "application/vnd.ms-excel"},    
            {".xlsx",   "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},   
            {".exe",    "application/octet-stream"},   
            {".gif",    "image/gif"},   
            {".gtar",   "application/x-gtar"},   
            {".gz", "application/x-gzip"},   
            {".h",  "text/plain"},   
            {".htm",    "text/html"},   
            {".html",   "text/html"},   
            {".jar",    "application/java-archive"},   
            {".java",   "text/plain"},   
            {".jpeg",   "image/jpeg"},   
            {".jpg",    "image/jpeg"},   
            {".js", "application/x-javascript"},   
            {".log",    "text/plain"},   
            {".m3u",    "audio/x-mpegurl"},   
            {".m4a",    "audio/mp4a-latm"},   
            {".m4b",    "audio/mp4a-latm"},   
            {".m4p",    "audio/mp4a-latm"},   
            {".m4u",    "video/vnd.mpegurl"},   
            {".m4v",    "video/x-m4v"},    
            {".mov",    "video/quicktime"},   
            {".mp2",    "audio/x-mpeg"},   
            {".mp3",    "audio/x-mpeg"},   
            {".mp4",    "video/mp4"},   
            {".mpc",    "application/vnd.mpohun.certificate"},          
            {".mpe",    "video/mpeg"},     
            {".mpeg",   "video/mpeg"},     
            {".mpg",    "video/mpeg"},     
            {".mpg4",   "video/mp4"},      
            {".mpga",   "audio/mpeg"},   
            {".msg",    "application/vnd.ms-outlook"},   
            {".ogg",    "audio/ogg"},   
            {".pdf",    "application/pdf"},   
            {".png",    "image/png"},   
            {".pps",    "application/vnd.ms-powerpoint"},   
            {".ppt",    "application/vnd.ms-powerpoint"},   
            {".pptx",   "application/vnd.openxmlformats-officedocument.presentationml.presentation"},   
            {".prop",   "text/plain"},   
            {".rc", "text/plain"},   
            {".rmvb",   "audio/x-pn-realaudio"},   
            {".rtf",    "application/rtf"},   
            {".sh", "text/plain"},   
            {".tar",    "application/x-tar"},      
            {".tgz",    "application/x-compressed"},    
            {".txt",    "text/plain"},   
            {".wav",    "audio/x-wav"},   
            {".wma",    "audio/x-ms-wma"},   
            {".wmv",    "audio/x-ms-wmv"},   
            {".wps",    "application/vnd.ms-works"},   
            {".xml",    "text/plain"},   
            {".z",  "application/x-compress"},   
            {".zip",    "application/x-zip-compressed"},   
            {"",        "*/*"}