Question

我正在尝试访问Manifest.permission中的权限列表，这是一个最终类。如何访问其声明的String值？

Answer 1

从字面上看，我认为问题是如何简单地获取POSSIBLE权限列表，而不是包的运行时权限。假设这是真的，这只是一个反思问题。

你会做这样的事情（未编译）：

List<Field> permissionFields = new ArrayList<Field>();
Field[] fields = Manifest.permission.class.getDeclaredFields();
for (Field declField : fields) {
  if ((declField.getType() == String.class) && Modifier.isFinal(declField.getModifiers())) {
    permissionFields.add(declField);
  }
}

“permissionFields”列表包含作为权限值的对象列表。您可以使用“Field.getObject（obj）”方法来获取String值（奇怪的是，似乎没有“Field.getString（obj）”方法，尽管还有其他几个“Field.get（obj））“方法（可能因为String不是原始的））。

Answer 2

以下是代码：

Log.d(TAG, "Getting permissions for " + packageName);
try {
    PackageInfo pkgInfo = getPackageManager().getPackageInfo(
                packageName, 
                PackageManager.GET_PERMISSIONS
              );
    PermissionInfo[] permissions = pkgInfo.permissions;
    if (permissions == null) {
    permissionsField.setText("No declared permissions");
    }
    else {
    String permissionsText = "";
    for (int i = 0; i < permissions.length; i++) {
        switch (permissions[i].protectionLevel) {
            case 0:
                permissionsText += permissions[i].name + ":::" + "NORMAL" + "\n";
                break;
            case 1:
                permissionsText += permissions[i].name + ":::" + "DANGEROUS" + "\n";
                break;
            case 2:
                permissionsText += permissions[i].name + ":::" + "SIGNATURE" + "\n";
                break;
            case 3:
                permissionsText += permissions[i].name + ":::" + "SIGNATUREORSYSTEM" + "\n";
                break;  
        }
    }
    permissionsField.setText(permissionsText);
    }

    String[] requestedPermissions = pkgInfo.requestedPermissions;
    if (requestedPermissions == null) {
    requestedPermissionsField.setText("No requested permissions");
    }
    else {
    String reqPermText = "";
    for (int i = 0; i < requestedPermissions.length; i++) {
        reqPermText += requestedPermissions[i] + "\n";
    }
    requestedPermissionsField.setText(reqPermText);
    }
}
catch (PackageManager.NameNotFoundException e) {
    permissionsField.setText("Package Not Found");
    requestedPermissionsField.setText("Package Not Found");
}

以编程方式访问Manifest.permission？

2 个答案: