权限请求 (WRITE_EXTERNAL_STORAGE) 未显示

Question

安卓6

我编写了下一个代码来检查权限，如果没有这样的权限，它会要求用户授予它们。

private void checkDiskPermission ()
{
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
        Toast.makeText(this, "no disk access" , Toast.LENGTH_LONG).show();
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
    }
    else
    {
        Toast.makeText(this, "disk access - OK" , Toast.LENGTH_LONG).show();
    }

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        Toast.makeText(this, "no GPS access" , Toast.LENGTH_LONG).show();
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 0);
    }
    else
    {
        Toast.makeText(this, "GPS access - OK" , Toast.LENGTH_LONG).show();
    }
}

此代码适用于 GPS 权限，但不适用于 WRITE_EXTERNAL_STORAGE 权限。对话框仅在一种情况下出现。

为什么会这样呢？

谢谢！

Answer 1

因为你同时请求了两次。这就是为什么它接受最后一个请求。

解决方案是您必须在一个请求中请求两项许可

像这样-

private void checkDiskPermission ()
{
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        Toast.makeText(this, "No Permissions" , Toast.LENGTH_LONG).show();
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 0);
    }
    else
    {
        Toast.makeText(this, "Has Permissions" , Toast.LENGTH_LONG).show();
    }
}