无论如何在Android中将Drawable转换为int

Posted 2023-02-24

【中文标题】无论如何在Android中将Drawable转换为int

【英文标题】：Is there anyway to turn a Drawable to an int in Android

【发布时间】：2017-10-11 09:38:48

【问题描述】：

我正在制作一个显示 android 设备已安装权限详细信息的应用。目前，我正在显示一个带有上述权限图标的 AlertDialog，但我也想根据用户的请求发送通知。我的代码是：

Drawable icon;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) 
    String permission = getArguments().getString("permission");
    String label = "";
    String description = "";
    icon = null;
    try 
        label = getActivity().getPackageManager().getPermissionInfo(permission, PackageManager.GET_META_DATA).loadLabel(getActivity().getPackageManager()).toString();
        description = getActivity().getPackageManager().getPermissionInfo(permission, PackageManager.GET_META_DATA).loadDescription(getActivity().getPackageManager()).toString();
        icon = getActivity().getPackageManager().getPermissionInfo(permission, PackageManager.GET_META_DATA).loadIcon(getActivity().getPackageManager());
     catch (Exception ignored) 
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity())
            .setTitle("Permission")
            .setMessage("Permission: " + getArguments().getString("permission") + Character.toString((char) 10) + "Label: " + label + Character.toString((char) 10) + "Description: " + description)
            .setPositiveButton("Dismiss", null)
            .setCancelable(false);
    if (icon != null) 
        builder.setIcon(icon);
    
    final AlertDialog alertDialog = builder.create();
    alertDialog.setCanceledOnTouchOutside(false);
    alertDialog.setOnShowListener(new DialogInterface.OnShowListener() 
        @Override
        public void onShow(DialogInterface dialog) 
            // Show notification here
        
    );
    return alertDialog;

但是，v4 NotificationCompat.Builder 不能将 Drawable 只取一个 int，我该怎么办？

【问题讨论】：

the v4 NotificationCompat.Builder can not take a Drawable only an int。它需要 资源 id。结果是一个整数。

【参考方案1】：

您可以像这样获取图标资源 id（假设 permission 是您在问题中也使用的字符串）：

final PackageManager pm = context.getPackageManager();
PermissionInfo info = pm.getPermissionInfo(permission, PackageManager.GET_META_DATA);
int iconResourceId = info.icon;

然后……

NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext());
builder.setSmallIcon(iconResourceId);

【参考方案2】：

R.drawable 是一个整数，R.color 或 R.string 或 R.layout 也是如此