添加打开方式

• 在AndroidManifest.xml中为activity添加如下Tag
  此activity为选择使用App打开之后显示的Activity。

<activity
            android:name=".***"
            android:launchMode="singleTask"
            android:screenOrientation="portrait">
            <intent-filter tools:ignore="AppLinkUrlError">
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="application/vnd.ms-excel" />
            </intent-filter>
            <intent-filter tools:ignore="AppLinkUrlError">
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" />
            </intent-filter>
            <intent-filter tools:ignore="AppLinkUrlError">
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="text/comma-separated-values" />
            </intent-filter>
        </activity>

• android:mimeType
  1.application/vnd.ms-excel：Excel xls格式
  2.application/vnd.openxmlformats-officedocument.spreadsheetml.sheet：Excel xlsx格式
  3.text/comma-separated-values：Excel csv格式

处理接收到的数据

protected void onCreate(Bundle savedInstanceState) {
        ...
        //
        Intent intent = getIntent();
        String action = intent.getAction();
        if(intent.ACTION_VIEW.equals(action)){
            Uri uri = intent.getData();
            String fileType = intent.getType();
            if (null != uri){
                //防止部分uri getPath之后是编码之后的路径
                String realPath = Uri.decode(uri.getEncodedPath());
                if(realPath.lastIndexOf(".") == -1){
                    // 防止部分uri getPath之后不带文件名
                    String realPath_ = UriUtils.getRealFilePath(this, uri);
                    if (null != realPath_){
                        realPath = realPath_;
                    }
                }
                String filename = uri.getLastPathSegment();
                int start = realPath.lastIndexOf("/");
                if (start != -1){
                    filename = realPath.substring(start+1,realPath.length());
                }
                //如果文件名没有后缀，根据type添加后缀
                if (filename.lastIndexOf(".") == -1){
                    if (fileType != null){
                        if (fileType.equals("text/comma-separated-values")){
                            filename = filename + ".csv";
                        }else if (fileType.equals("application/vnd.ms-excel")){
                            filename = filename + ".xls";
                        }else if (fileType.equals("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")){
                            filename = filename + ".xlsx";
                        }
                    }
                }

                String newFilePath = StringUtils.importFilePathWithFileName(filename);
                try {
                    InputStream inputStream = getContentResolver().openInputStream(uri);
                  //此处是把uri对应的内容拷贝到自己的目录之后进行的处理
                    boolean result = UriUtils.copyFile(inputStream,newFilePath);
                    
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }
        }

    }   

public static boolean copyFile(InputStream inputStream, String newPath$Name) {
        try {
            File oldFile = new File(newPath$Name);
            if (oldFile.exists()){
                oldFile.delete();
            }
            FileOutputStream fileOutputStream = new FileOutputStream(newPath$Name);
            byte[] buffer = new byte[1024];
            int byteRead;
            while (-1 != (byteRead = inputStream.read(buffer))) {
                fileOutputStream.write(buffer, 0, byteRead);
            }
            inputStream.close();
            fileOutputStream.flush();
            fileOutputStream.close();
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

mimeType

收藏以备需要
{后缀名，MIME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"},
{"", "/"}