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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<uses-permission android:name=
"android.permission.WRITE_EXTERNAL_STORAGE"
>
<uses-permission android:name=
"android.permission.READ_EXTERNAL_STORAGE"
></uses-permission></uses-permission>
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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);
}
}
}
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然后直接在需要授权的地方调用：
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//检测读写权限
PermisionUtils.verifyStoragePermissions(
this
);
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程序运行的时候，会询问是否授权