原创内容，转载请注明原文网址：http://homeqin.cn/a/wenzhangboke/jishutiandi/Android/2019/0609/531.html

近来发现一个问题，我在运用ContextCompat.CheckSelfPermission()时不管若何开关权限回笼值都是PackageManager.PERMISSION_GRANTED，而运用PackageManager.checkPermission()的时候回笼值又永远都是PackageManager.PERMISSION_DENIED;

经由多番测试和查找材料发现原因：

If your application is targeting an API level before 23 (Android M) then both:ContextCompat.CheckSelfPermission and Context.checkSelfPermission doesn't work and always returns 0 (PERMISSION_GRANTED). Even if you run the application on Android 6.0 (API 23).

在targetSdkVersion小于23(Android M)的时候，ContextCompat.CheckSelfPermission 和Context.checkSelfPermission方法都不行正常事情而且永远返0(PERMISSION_GRANTED)，即便你的运用运行在Android6.0(API 23)的建筑上。

办理办法：

As I said in the 1st point, if you targeting an API level before 23 on Android 6.0 then ContextCompat.CheckSelfPermission and Context.checkSelfPermission doesn't work. Fortunately you can use PermissionChecker.checkSelfPermission to check run-time permissions.  

能够运用PermissionChecker.checkSelfPermission()去检查权限是否被付与。