fixed Surface method 'release' not called

android/src/main/java/com/idlefish/flutterboost/XFlutterTextureView.java

+package com.idlefish.flutterboost;
+
+import android.content.Context;
+import android.graphics.SurfaceTexture;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.util.AttributeSet;
+import android.view.Surface;
+import android.view.TextureView;
+import io.flutter.Log;
+import io.flutter.embedding.engine.renderer.FlutterRenderer;
+import io.flutter.embedding.engine.renderer.OnFirstFrameRenderedListener;
+
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+public class XFlutterTextureView extends TextureView implements FlutterRenderer.RenderSurface {
+    private static final String TAG = "XFlutterTextureView";
+    private boolean isSurfaceAvailableForRendering;
+    private boolean isAttachedToFlutterRenderer;
+    @Nullable
+    private FlutterRenderer flutterRenderer;
+    @NonNull
+    private Set<OnFirstFrameRenderedListener> onFirstFrameRenderedListeners;
+    private final SurfaceTextureListener surfaceTextureListener;
+
+    public XFlutterTextureView(@NonNull Context context) {
+        this(context, (AttributeSet)null);
+    }
+
+    public XFlutterTextureView(@NonNull Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+        this.isSurfaceAvailableForRendering = false;
+        this.isAttachedToFlutterRenderer = false;
+        this.onFirstFrameRenderedListeners = new HashSet();
+        this.surfaceTextureListener = new SurfaceTextureListener() {
+            public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
+                Log.v("FlutterTextureView", "SurfaceTextureListener.onSurfaceTextureAvailable()");
+                XFlutterTextureView.this.isSurfaceAvailableForRendering = true;
+                if (XFlutterTextureView.this.isAttachedToFlutterRenderer) {
+                    XFlutterTextureView.this.connectSurfaceToRenderer();
+                }
+
+            }
+
+            public void onSurfaceTextureSizeChanged(@NonNull SurfaceTexture surface, int width, int height) {
+                Log.v("FlutterTextureView", "SurfaceTextureListener.onSurfaceTextureSizeChanged()");
+                if (XFlutterTextureView.this.isAttachedToFlutterRenderer) {
+                    XFlutterTextureView.this.changeSurfaceSize(width, height);
+                }
+
+            }
+
+            public void onSurfaceTextureUpdated(@NonNull SurfaceTexture surface) {
+            }
+
+            public boolean onSurfaceTextureDestroyed(@NonNull SurfaceTexture surface) {
+                Log.v("FlutterTextureView", "SurfaceTextureListener.onSurfaceTextureDestroyed()");
+                XFlutterTextureView.this.isSurfaceAvailableForRendering = false;
+                if (XFlutterTextureView.this.isAttachedToFlutterRenderer) {
+                    XFlutterTextureView.this.disconnectSurfaceFromRenderer();
+                }
+
+                return true;
+            }
+        };
+        this.init();
+    }
+
+    private void init() {
+        this.setSurfaceTextureListener(this.surfaceTextureListener);
+    }
+
+    public void attachToRenderer(@NonNull FlutterRenderer flutterRenderer) {
+        Log.v("FlutterTextureView", "Attaching to FlutterRenderer.");
+        if (this.flutterRenderer != null) {
+            Log.v("FlutterTextureView", "Already connected to a FlutterRenderer. Detaching from old one and attaching to new one.");
+            this.flutterRenderer.detachFromRenderSurface();
+        }
+
+        this.flutterRenderer = flutterRenderer;
+        this.isAttachedToFlutterRenderer = true;
+        if (this.isSurfaceAvailableForRendering) {
+            Log.v("FlutterTextureView", "Surface is available for rendering. Connecting FlutterRenderer to Android surface.");
+            this.connectSurfaceToRenderer();
+        }
+
+    }
+
+    public void detachFromRenderer() {
+        if (this.flutterRenderer != null) {
+            if (this.getWindowToken() != null) {
+                Log.v("FlutterTextureView", "Disconnecting FlutterRenderer from Android surface.");
+                this.disconnectSurfaceFromRenderer();
+            }
+
+            this.flutterRenderer = null;
+            this.isAttachedToFlutterRenderer = false;
+        } else {
+            Log.w("FlutterTextureView", "detachFromRenderer() invoked when no FlutterRenderer was attached.");
+        }
+
+    }
+
+    private void connectSurfaceToRenderer() {
+        if (this.flutterRenderer != null && this.getSurfaceTexture() != null) {
+            Surface surface= new Surface(this.getSurfaceTexture());
+            this.flutterRenderer.surfaceCreated(surface);
+            surface.release();
+        } else {
+            throw new IllegalStateException("connectSurfaceToRenderer() should only be called when flutterRenderer and getSurfaceTexture() are non-null.");
+        }
+    }
+
+    private void changeSurfaceSize(int width, int height) {
+        if (this.flutterRenderer == null) {
+            throw new IllegalStateException("changeSurfaceSize() should only be called when flutterRenderer is non-null.");
+        } else {
+            Log.v("FlutterTextureView", "Notifying FlutterRenderer that Android surface size has changed to " + width + " x " + height);
+            this.flutterRenderer.surfaceChanged(width, height);
+        }
+    }
+
+    private void disconnectSurfaceFromRenderer() {
+        if (this.flutterRenderer == null) {
+            throw new IllegalStateException("disconnectSurfaceFromRenderer() should only be called when flutterRenderer is non-null.");
+        } else {
+            this.flutterRenderer.surfaceDestroyed();
+        }
+    }
+
+    public void addOnFirstFrameRenderedListener(@NonNull OnFirstFrameRenderedListener listener) {
+        this.onFirstFrameRenderedListeners.add(listener);
+    }
+
+    public void removeOnFirstFrameRenderedListener(@NonNull OnFirstFrameRenderedListener listener) {
+        this.onFirstFrameRenderedListeners.remove(listener);
+    }
+
+    public void onFirstFrameRendered() {
+        Log.v("FlutterTextureView", "onFirstFrameRendered()");
+        Iterator var1 = this.onFirstFrameRenderedListeners.iterator();
+
+        while(var1.hasNext()) {
+            OnFirstFrameRenderedListener listener = (OnFirstFrameRenderedListener)var1.next();
+            listener.onFirstFrameRendered();
+        }
+
+    }
+}
\ No newline at end of file

android/src/main/java/com/idlefish/flutterboost/XFlutterView.java

@@ -202,7 +202,7 @@ public class XFlutterView extends FrameLayout {
         break;
       case texture:
         Log.v(TAG, "Internally using a FlutterTextureView.");
-        FlutterTextureView flutterTextureView = new FlutterTextureView(getContext());
+        XFlutterTextureView flutterTextureView = new XFlutterTextureView(getContext());
         renderSurface = flutterTextureView;
         addView(flutterTextureView);
         break;