java - Android RecyclerView 无法呈现 SurfaceView

Question

SurfaceView 可以在 RecyclerView 中渲染吗

编辑:即使这样也无法在 RecyclerView 内部呈现:https://github.com/android/ndk-samples/tree/master/hello-gl2

编辑 2:https://github.com/mgood7123/RecyclerViewSurfaceViewGrid证明问题的最小示例

    // public class GLSurfaceView extends SurfaceView implements SurfaceHolder.Callback2 {
    // class GL2JNIView extends GLSurfaceView {
    GL2JNIView mView;
    public ViewGroup onViewRequest(Context mContext) {
        if (context == null) context = mContext;
        mView = new GL2JNIView(context);
        RelativeLayout rel = new RelativeLayout(context);
        rel.addView(mView);
        mView.onResume();
        return rel;
    }
    public ViewGroup onViewRequest_(Context mContext) {} // old openGL Cube

我想做的是制作一个 SurfaceView 的网格

@Keep
public class NativeView {
    String TAG = "EglSample";
    public static native void nativeOnStart();
    public static native void nativeOnResume();
    public static native void nativeOnPause();
    public static native void nativeOnStop();

    // this is part of graphics manager
    public native void nativeSetSurface(Surface surface);

    View surfaceView = null;
    SurfaceHolderCallback surfaceHolderCallback = null;

    public NativeView(Context context) {
        System.loadLibrary("nativeegl");
        surfaceHolderCallback = new SurfaceHolderCallback();
        surfaceView = new View(surfaceHolderCallback, context);
    }

    class View extends SurfaceView {
        public View(SurfaceHolder.Callback callback, Context context) {
            super(context);
            getHolder().addCallback(callback);
        }

        public View(SurfaceHolder.Callback callback, Context context, AttributeSet attrs) {
            super(context, attrs);
            getHolder().addCallback(callback);
        }

        public View(SurfaceHolder.Callback callback, Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            getHolder().addCallback(callback);
        }

        public View(SurfaceHolder.Callback callback, Context context, AttributeSet attrs, int defStyle, int defStyleRes) {
            super(context, attrs, defStyle, defStyleRes);
            getHolder().addCallback(callback);
        }
    }

    class SurfaceHolderCallback implements SurfaceHolder.Callback {
        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
            nativeSetSurface(holder.getSurface());
        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            nativeSetSurface(null);
        }
    }
}
    public ViewGroup onViewRequest(Context mContext) {
        if (context == null) context = mContext;

        if (n == null) n = new NativeView(context);
        Log.i(n.TAG, "onViewRequest(Activity, Context)");
        // build layout
        RelativeLayout rel = new RelativeLayout(context);
        rel.addView(n.surfaceView);
        n.surfaceView.setOnClickListener(new MyListener());
        // set text
        TextView text = new TextView(context);
        text.setText("Hello World! Try clicking the screen");
        text.setTextSize(60f);
        text.setTextColor(Color.WHITE);
        rel.addView(text);
        Log.i(n.TAG, "onCreate()");
        // build layout
        NativeView.nativeOnStart();
        NativeView.nativeOnResume();
        return rel;
    }

完整:

https://github.com/mgood7123/VSTDEMO/blob/0f5e7063d9ebef5ae5a05f128d548eec712b741f/vstdemoopengladdonscube/src/main/java/vst/demo/opengl/addons/cube/main.java

https://github.com/mgood7123/VSTDEMO/blob/0f5e7063d9ebef5ae5a05f128d548eec712b741f/vstdemoopengladdonscube/src/main/java/vst/demo/opengl/addons/cube/NativeView.java

因为它在回收器 View 中呈现损坏(文本但没有表面 View )(您几乎看不出白色文本，但它在那里的事实意味着正在绘制 View 层次结构)

(设置 USE_RECYCLER_VIEW = true)

https://github.com/mgood7123/VSTDEMO/blob/0f5e7063d9ebef5ae5a05f128d548eec712b741f/VstManager/src/main/java/vst/manager/VstGrid.java#L29

    Boolean USE_RECYCLER_VIEW = false;
    public LinearLayout getView() {
        // this assumes the first available "*\.addons\.*" package
        if (!USE_RECYCLER_VIEW) {
            VST pkg = mVstMan.loadPackage(mActivity, mVstMan.getPackages(mActivity)[0].packageName, false);
            VST.CLASS vstClass = mVstMan.loadClass(pkg, "main");
            Object vstClassInstance = mVstMan.newInstance(vstClass, "main");
            // android.widget.RelativeLayout cannot be cast to android.widget.LinearLayout
            LinearLayout x = new LinearLayout(mActivity);
            x.addView((ViewGroup) mVstMan.invokeMethod(
                    vstClass, vstClassInstance,
                    "onViewRequest", Context.class,
                    pkg.activityApplicationContext
                    )
            );
            return x;
        } else {
            if (recyclerViewMain == null)
                recyclerViewMain = (LinearLayout) LayoutInflater.from(mActivity.getApplicationContext())
                        .inflate(R.layout.vst_grid, null, false);
            if (recyclerView == null) {
                recyclerView = recyclerViewMain
                        .findViewById(R.id.VstGrid);

                // use this setting to improve performance if you know that changes
                // in content do not change the layout size of the RecyclerView
                recyclerView.setHasFixedSize(true);
            }
            if (layoutManager == null) {
                // use a linear layout manager
                layoutManager = new GridLayoutManager(mActivity, 1);
                recyclerView.setLayoutManager(layoutManager);
            }
            if (mAdapter == null) {
                // specify an adapter (see also next example)
                mAdapter = new VstGridAdapter(mActivity, mVstMan, mVstUI);
                recyclerView.setAdapter(mAdapter);
            }
            mAdapter.update();
            return recyclerViewMain;
        }
    }

https://github.com/mgood7123/VSTDEMO/blob/0f5e7063d9ebef5ae5a05f128d548eec712b741f/VstManager/src/main/java/vst/manager/VstGridAdapter.java#L86

    // Create new views (invoked by the layout manager)
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        VST pkg = mVstMan.loadPackage(mActivity, mVstMan.getPackages(mActivity)[0].packageName, false);
        VST.CLASS vstClass = mVstMan.loadClass(pkg, "main");
        Object vstClassInstance = mVstMan.newInstance(vstClass, "main");
        // android.widget.RelativeLayout cannot be cast to android.widget.LinearLayout
        LinearLayout x = new LinearLayout(mActivity);
        x.addView((ViewGroup) mVstMan.invokeMethod(
                        vstClass, vstClassInstance,
                        "onViewRequest", Context.class,
                        pkg.activityApplicationContext
                )
        );
        return new MyViewHolder(x);
    }

https://github.com/mgood7123/VSTDEMO/blob/0f5e7063d9ebef5ae5a05f128d548eec712b741f/vstdemoopengladdonscube/src/main/cpp/RotatingSquares/jniapi.cpp

https://github.com/mgood7123/VSTDEMO/blob/0f5e7063d9ebef5ae5a05f128d548eec712b741f/vstdemoopengladdonscube/src/main/cpp/RotatingSquares/renderer.cpp#L153

与此同时，如果不在回收站 View 中(将 USE_RECYCLER_VIEW 保留为 false)，它会呈现得非常好

为什么？

Answer 1

显然，为了让它显示，我需要为 View 提供固定大小的布局参数:mView.setLayoutParams(new ViewGroup.LayoutParams(500, 500));