解决安卓7.0系统写入SD卡权限失败问题

深碍√TFBOYSˉ_ 2022-05-27 00:56 182阅读 0赞

原文：https://blog.csdn.net/wi2rfl78/article/details/78314286

如图所示，在mainfest文件中声明了SD卡的读和写权限，仍旧报错：

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

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![结果报出以下错误：][SouthEast]  
安卓23.0版本以上，不仅仅要设置上面的权限，还要在对SD卡有读写操作的地方授权，下面是公共类：

import android.Manifest;
    import android.app.Activity;
    import android.content.pm.PackageManager;
    import android.support.v4.app.ActivityCompat;
    
    public class PermisionUtils { 
    
        // 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};
    
        /** * Checks if the app has permission to write to device storage * If the app does not has permission then the user will be prompted to * grant permissions * * @param activity */
        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);
            }
        }
    }

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然后直接在需要授权的地方调用：

verifyStoragePermissions(this);

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this指的是当前的Activity，程序运行会出现以下结果：   
![这里写图片描述][SouthEast 1]   
点击ALLOW之后，程序获取SD卡读写权限，就算你把代码里的   
verifyStoragePermissions(this);语句删了，只要不卸载应用程序，权限就仍然存在。

[SouthEast]: /images/20220527/906a6949733b4b90aaf52de354d8fb66.png
[SouthEast 1]: /images/20220527/fb6715da0a1449838dc862d402965109.png