我已经找这个问题一个星期了。如何检查第三方应用是否已请求对我的应用的存储文件夹的读/写权限？
我想的是：

private String TAG = "concernedClass";
private boolean myAppIsRunning;
//myAppIsRunning is set true when the app is in foreground
if(myAppIsRunning){
    //do something
}else if(!myAppIsRunning && (/*code to check if my app's storage folder was accessed*/)){
    Log.v(TAG,"Folder was accessed");
}

我应该替换什么 /*code to check if my app's storage folder was accessed*/ 用什么？