Android文件管理器开发对各类文件的打开以及处理

针对Android6.0开发的

对读写权限的处理

public class AppUtil {
    // Storage Permissions
    private static final int REQUEST_EXTERNAL_STORAGE = 1;
    private static String[] PERMISSIONS_STORAGE = {
        Manifest.permission.READ_EXTERNAL_STORAGE,
        Manifest.permission.WRITE_EXTERNAL_STORAGE };
       
    public static void verifyStoragePermissions(Activity activity) {
        // Check if we have write permission
        int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (permission != PackageManager.PERMISSION_GRANTED) {
            // We don't have permission so prompt the user
            ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE);
        }
    }

}

建立一个MIME类型与文件后缀名的匹配表
  

 private final String[][] MIME_MapTable = {
            //{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"},
            {".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"},
            {".prop", "text/plain"},
            {".rar", "application/x-rar-compressed"},
            {".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/xml"},
            {".xml", "text/plain"},
            {".z", "application/x-compress"},
            {".zip", "application/zip"},
            {"", "*/*"}
    };

可自行添加
 

   //通过文件名判断是什么类型的文件

    private boolean checkEndsWithInStringArray(String checkItsEnd, String[] fileEndings) {
        for (String aEnd : fileEndings) {
            if (checkItsEnd.endsWith(aEnd))
                return true;
        }
        return false;
    }


  private String getMIMEType(File file) {
        String type = "*/*";
        String fName = file.getName();

        //获取后缀名前的分隔符"."在fName中的位置。
        int dotIndex = fName.lastIndexOf(".");
        if (dotIndex < 0) {
            return type;
        }

        /* 获取文件的后缀名 */
        String end = fName.substring(dotIndex, fName.length()).toLowerCase();
        if (end == "") {
            return type;
        }

        //在MIME和文件类型的匹配表中找到对应的MIME类型。
        for (int i = 0; i < MIME_MapTable.length; i++) {
            if (end.equals(MIME_MapTable[i][0])) {
                type = MIME_MapTable[i][1];
            }
        }

        return type;
    }

打开一个文件 先要获取到文件的类型以及其对应的信息然后通过intent去寻找打开对应文件的功能

    /**
     * 打开文件
     *
     * @param file
     */
    private void openFile(File file) {
        if( file == null ) {
            return;
        }
        //Uri uri = Uri.parse("file://"+file.getAbsolutePath());
        Intent intent = new Intent();
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        //设置intent的Action属性
        intent.setAction(Intent.ACTION_VIEW);
        //获取文件file的MIME类型
        String type = getMIMEType(file);
        //设置intent的data和Type属性。
        intent.setDataAndType(Uri.fromFile(file), type);
        //跳转

        try {
            startActivity(intent);
        } /*catch(E) {

        } */catch (Exception e) {
            e.printStackTrace();
        }
    }