Android 申请权限

private static void checkPermissions(final Activity activity) {
        try {
            ClassLoader classLoader = activity.getClassLoader();
            classLoader.loadClass("android.support.v4.app.ActivityCompat");
            classLoader.loadClass("android.support.v4.content.ContextCompat");
            Context applicationContext = activity.getApplicationContext();
            PackageManager packageManager = applicationContext.getPackageManager();
            PackageInfo packageInfo = packageManager.getPackageInfo(
                    applicationContext.getPackageName(),
                    PackageManager.GET_PERMISSIONS);
            String[] requirePermissions = packageInfo.requestedPermissions;
            final ArrayList<String> deniedPermissions = new ArrayList<>(requirePermissions.length);
            for (String permission : requirePermissions) {
                if (ContextCompat.checkSelfPermission(activity, permission) == PackageManager.PERMISSION_DENIED) {
                    deniedPermissions.add(permission);

                } else {
                // do anything!!!
                }
            }
            if (deniedPermissions.size() > 0) {
                activity.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        String[] requestPermissions = new String[deniedPermissions.size()];
                        requestPermissions = deniedPermissions.toArray(requestPermissions);
                        ActivityCompat.requestPermissions(activity, requestPermissions, PERMISSIONS_REQUEST_CODE);
                    }
                });
            }
        } catch (ClassNotFoundException e) {
           //Android Support v4 Library is require,Please //use 23 or higher
            e.printStackTrace();
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchMethodError error) {
            //Android Support v4 Library version too low, //Please upgrade 23 or higher
            error.printStackTrace();
        }
    }