解决设置Android 23.0以上版本对SD卡的读写权限无效的问题（转载）

转载自：https://www.2cto.com/kf/201707/653938.html

解决设置Android 23.0以上版本对SD卡的读写权限无效的问题。对Android的SD卡进行读取权限设置时：

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1 2	<uses-permission android:name= "android.permission.WRITE_EXTERNAL_STORAGE" > <uses-permission android:name= "android.permission.READ_EXTERNAL_STORAGE" ></uses-permission></uses-permission>

结果报错：

依然提示没有权限，百度说是版本问题，23.0版本（笔者的版本是25.0）以上的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：

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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);          }      } }

然后直接在需要授权的地方调用：

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1 2	//检测读写权限 PermisionUtils.verifyStoragePermissions( this );

程序运行的时候，会询问是否授权