I'm trying to implement download/upload functions on android it work fine but with IOException can't access sdcard


i have try following code

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File routesRoot = Environment.getExternalStorageDirectory();
            if (!routesRoot.canWrite())
                System.out.println("can't write root");
            if (!routesRoot.canRead())
                System.out.println("can't read root");


And get poth can't read , write to sdcard now i search for solving that problem

while i have set permission

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

Can any one help or advice ?