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Assets/Script/ AndroidImagePicker.cs

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+namespace Unity.RenderStreaming
+{
+#if UNITY_ANDROID && !UNITY_EDITOR
+    public class AndroidImagePicker : MonoBehaviour
+    {
+        private static AndroidImagePicker _instance;
+        private Action<Texture2D> _callback;
+        private AndroidJavaObject _activity;
+        private bool _waitingForResult;
+        private string _pickedImagePath;
+
+        public static AndroidImagePicker Instance
+        {
+            get
+            {
+                if (_instance == null)
+                {
+                    var go = new GameObject(nameof(AndroidImagePicker));
+                    DontDestroyOnLoad(go);
+                    _instance = go.AddComponent<AndroidImagePicker>();
+                }
+                return _instance;
+            }
+        }
+
+        public void PickImage(Action<Texture2D> onImagePicked)
+        {
+            _callback = onImagePicked;
+
+            using (AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
+            {
+                _activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
+            }
+
+            _activity.Call("runOnUiThread", new AndroidJavaRunnable(() =>
+            {
+                using (AndroidJavaObject intent = new AndroidJavaObject("android.content.Intent",
+                    "android.intent.action.PICK"))
+                {
+                    intent.Call<AndroidJavaObject>("setType", "image/*");
+                    using (AndroidJavaObject i = intent.Call<AndroidJavaObject>("createChooser",
+                        _activity, "选择头像"))
+                    {
+                        _activity.Call("startActivity", i);
+                    }
+                }
+            }));
+
+            _waitingForResult = true;
+        }
+
+        private void Update()
+        {
+            if (!_waitingForResult) return;
+
+            try
+            {
+                if (_activity == null) return;
+                using (AndroidJavaClass uriClass = new AndroidJavaClass("android.net.Uri"))
+                {
+                }
+            }
+            catch
+            {
+                // ignored
+            }
+        }
+    }
+#endif
+}