android打开本地文件

参考文章  https://www.cnblogs.com/fwling/p/7239983.html

/**
 * android 打开本地文件
 *
 * @param path    本地文件路径
 * @param context 上下文
 */
public void openFile(String path, Context context) {
    try {
        File file = new File(path);
        Uri uri = null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {//24 android7
            uri = FileProvider.getUriForFile(context, context.getPackageName() + ".fileProvider", file);
        } else {
            uri = Uri.fromFile(file);
        }
        context.grantUriPermission(context.getPackageName(), uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
        Intent intent2 = new Intent("android.intent.action.VIEW");
        intent2.addCategory("android.intent.category.DEFAULT");
        intent2.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent2.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        Log.d("sss", "opneFile: uri " + uri.toString());
        String type = AndroidFileUtil.getMIMEtype(path);
        intent2.setDataAndType(uri, type);
        context.startActivity(intent2);
    } catch (Exception e) {
        Log.d("sss", "loadAccessorySuccess: error " + e.toString());
    }
}

获取打开文件的type的工具类

public class AndroidFileUtil {
    public static String getMIMEtype(String path) {
        String type = "*/*";
        //获取后缀名前的分隔符"."在fName中的位置。
        int dotIndex = path.lastIndexOf(".");
        if (dotIndex < 0)
            return type;
    /* 获取文件的后缀名 */
        String fileType = path.substring(dotIndex, path.length()).toLowerCase();
        if (fileType == null || "".equals(fileType))
            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 (fileType.equals(MIME_MapTable[i][0]))
                type = MIME_MapTable[i][1];
        }
        return type;
    }

    private static 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"},
            {".docx", "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"},
            {".xls", "application/vnd.ms-excel"},
            {".xlsx", "application/vnd.ms-excel"},
            {".z", "application/x-compress"},
            {".zip", "application/zip"},
            {"", "*/*"}
    };
}