如何在 Unity 中获取 Android 安装的应用程序图标

Question

很快，我想获取设备中所有已安装的应用程序（图标和标签）。 我正在使用一个简单的代码来获取应用程序的名称。

我使用 Android Java Class 来获取这些信息。 问题是 Android 选择应用程序图标作为Drawable 。 Unity 无法读取并将其显示为Sprite 。

我想知道是否有办法解决这个问题。 我试图将 drawable 编码为 base64 字符串，但 Unity“回复”了我“无效的字符串长度”错误，可能是因为 base64 字符串的“无限”长度。

我正在尝试将 Drawable 转换为字节数组，然后使用它来创建带有Texture.loadImage(byte[])的纹理，但它不起作用。 这是代码：

 AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
    AndroidJavaObject currentActivity = jc.GetStatic<AndroidJavaObject>("currentActivity");
    int flag = new AndroidJavaClass("android.content.pm.PackageManager").GetStatic<int>("GET_META_DATA");
    AndroidJavaObject pm = currentActivity.Call<AndroidJavaObject>("getPackageManager");
    AndroidJavaObject packages = pm.Call<AndroidJavaObject>("getInstalledApplications", flag);

    int count = packages.Call<int>("size");
    string[] names = new string[count];
    int ii =0;
    for(int i=0; ii<count;){
            //get the object
        AndroidJavaObject currentObject = packages.Call<AndroidJavaObject>("get", ii );
        try{
                //try to add the variables to the next entry
            names[i] = pm.Call<string>("getApplicationLabel", currentObject);
            AndroidJavaObject icon = pm.Call<AndroidJavaObject>("getApplicationIcon", currentObject);//this part is the Java (Android Studio) code using Android Java Object and Class of Unity. Maybe the error is from here
            AndroidJavaObject bitmap = icon.Call<AndroidJavaObject>("getBitmap");
            AndroidJavaClass stream = new AndroidJavaClass("java.io.ByteArrayOutputStream");
            bitmap.Call("compress",(new AndroidJavaClass("java.io.ByteArrayOutputStream")).Call<AndroidJavaObject>("JPEG"), 100, stream);
            byte[] bitMapData = stream.Call<byte[]>("toByteArray");//to here
            Texture2D mytexture = new Texture2D(50, 50); // no idea what default size would be?? is it important??
            if (!mytexture.LoadImage(bitMapData)) {
                Debug.Log("Failed loading image data!");
            }
            else {
                Debug.Log("LoadImage - Still sane here - size: " + mytexture.width + "x" + mytexture.height);
                GameObject app = (GameObject)Instantiate(App, Vector3.zero, Quaternion.identity);
                app.GetComponent<RawImage>().texture = mytexture;//here is the code should display the icon as texture (sprite would be the best)
            }
            i++;
            ii++;
        }
        catch(Exception e){
            Debug.LogError(e,this);
                //if it fails, just go to the next app and try to add to that same entry.
            ii++;
        }

    }

这里有 Java Android Studio 工作代码：

        Bitmap bitmap = ((BitmapDrawable) item.getIcon()).getBitmap(); //item.getIcon() returns the Drawable correctly
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
        byte[] byteArray = baos.toByteArray();

Answer 1

我在 Android Studio（无活动）上创建了一个 Android Jar 插件，然后我将它导入到 Unity3D（AndroidManifest.xml 和 classes.jar 在 Assets>Plugins>Android>libs 中）。 在插件中，我添加了一个类，然后添加了 void 来获取图标的字节 []。 Java Android 插件类：

public class PluginClass {

public static byte[] getIcon(PackageManager pm, ApplicationInfo applicationInfo) {
    try {
        BitmapDrawable icon = (BitmapDrawable) pm.getApplicationIcon(applicationInfo);
        Bitmap bmp = icon.getBitmap();
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
        byte[] byteArray = stream.toByteArray();
        return byteArray;
    } catch (Exception e) {
        return null;
    }
}

public static boolean isSystem(ApplicationInfo applicationInfo){
    return (applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM ) != 0;
   }
}
Then I have invoked it in Unity C# script:

void Start () {
    AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
    AndroidJavaObject currentActivity = jc.GetStatic<AndroidJavaObject>("currentActivity");
    int flag = new AndroidJavaClass("android.content.pm.PackageManager").GetStatic<int>("GET_META_DATA");
    AndroidJavaObject pm = currentActivity.Call<AndroidJavaObject>("getPackageManager");
    AndroidJavaObject packages = pm.Call<AndroidJavaObject>("getInstalledApplications", 0);
    int count = packages.Call<int>("size");
    string[] names = new string[count];
    List<byte[]> byteimg = new List<byte[]>();
    int ii =0;
    for(int i=0; ii<count;){
        AndroidJavaObject currentObject = packages.Call<AndroidJavaObject>("get", ii );
        try{
            names[i] = pm.Call<string>("getApplicationLabel", currentObject);
            var plugin = new AndroidJavaClass("com.mypackagename.PluginClass");
            if(plugin.CallStatic<bool>("isSystem",currentObject)){
                ii++;
                continue;
            }
            byte[] decodedBytes = plugin.CallStatic<byte[]>("getIcon", pm, currentObject);
            Texture2D text = new Texture2D(1, 1, TextureFormat.ARGB32, false);
            text.LoadImage(decodedBytes);
            Sprite sprite = Sprite.Create (text, new Rect(0,0,text.width,text.height), new Vector2(.5f,.5f));
            i++;
            ii++;
        }
        catch(Exception e){
            Debug.LogError(e,this);
            ii++;
        }

    }