android - fine_location 权限 android 的常量

Question

我搜索了如何初始化 requestPermissions 并找到了以下代码:

if (ActivityCompat.checkSelfPermission((Activity)mContext, 
android.Manifest.permission.ACCESS_FINE_LOCATION) != 
PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions((Activity)mContext, new String[]{
        android.Manifest.permission.ACCESS_FINE_LOCATION
}, Integer constant required); 

它需要第三个参数，它是 FINE LOCATION 的 Inter 常量。我找不到那个。请帮我解决这个问题。

Answer 1

第三个参数是权限的requestCode，你可以创建它常量像下面一样

private int STORAGE_PERMISSION_CODE = 23; //you can pass any code here
ActivityCompat.requestPermissions((Activity)mContext, new String[]{
    android.Manifest.permission.ACCESS_FINE_LOCATION}, STORAGE_PERMISSION_CODE); 

该参数用于在重写时与onRequestPermissionsResult方法第一个参数的requestCode进行比较。

   @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        //Checking the request code of our request
        if (requestCode == STORAGE_PERMISSION_CODE) {

            //If permission is granted
            if (grantResults.length > 0 && grantResults[0] == 0) {

                //Displaying a toast
                Toast.makeText(context, "Permission granted now.", Toast.LENGTH_LONG).show();
            } else {
                //Displaying another toast if permission is not granted
               Toast.makeText(context, "Permission denied.",Toast.LENGTH_LONG).show();
            }
        }
    }