java - 权限请求 (WRITE_EXTERNAL_STORAGE) 未显示

Question

安卓 6

我编写了下一个检查权限的代码，如果没有这样的权限，它会要求用户提供它们。

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？

谢谢!

Answer 1

因为您同时请求了 2 次。这就是它接受最后一个请求的原因。

解决方案是你必须在一个请求中请求两个权限

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();
    }
}