如何从表面视图获取位图

如何解决如何从表面视图获取位图

我试图从我的表面视图中获取位图。我已经在这个论坛和大多数论坛上看到了很多答案。我正在使用 ViewGroup 的自定义类，其中我使用表面视图来预览相机图像和图形叠加。

这是我的 CameraSourcePreview.class

import android.content.Context;
import android.content.res.Configuration;
import android.graphics.SurfaceTexture;
import android.support.v7.util.AsyncListUtil;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.common.images.Size;
import com.google.android.gms.vision.CameraSource;

import java.io.IOException;

public class CameraSourcePreview extends ViewGroup {
    private static final String TAG = "CameraSourcePreview";

    private Context mContext;
    private SurfaceView mSurfaceView;
    private boolean mStartRequested;
    private boolean mSurfaceAvailable;
    private CameraSource mCameraSource;

    private GraphicOverlay mOverlay;

    public CameraSourcePreview(Context context,AttributeSet attrs) {
        super(context,attrs);
        mContext = context;
        mStartRequested = false;
        mSurfaceAvailable = false;

        mSurfaceView = new SurfaceView(context);
        mSurfaceView.getHolder().addCallback(new SurfaceCallback());
        addView(mSurfaceView);
    }

    public void start(CameraSource cameraSource) throws IOException {
        if (cameraSource == null) {
            stop();
        }

        mCameraSource = cameraSource;

        if (mCameraSource != null) {
            mStartRequested = true;
            startIfReady();
        }
    }

    public void start(CameraSource cameraSource,GraphicOverlay overlay) throws IOException {
        mOverlay = overlay;
        start(cameraSource);
    }

    public void stop() {
        if (mCameraSource != null) {
            mCameraSource.stop();
        }
    }

    public void release() {
        if (mCameraSource != null) {
            mCameraSource.release();
            mCameraSource = null;
        }
    }

    private void startIfReady() throws IOException {
        if (mStartRequested && mSurfaceAvailable) {
            mCameraSource.start(mSurfaceView.getHolder());
            if (mOverlay != null) {
                Size size = mCameraSource.getPreviewSize();
                int min = Math.min(size.getWidth(),size.getHeight());
                int max = Math.max(size.getWidth(),size.getHeight());
                if (isPortraitMode()) {
                    // Swap width and height sizes when in portrait,since it will be rotated by
                    // 90 degrees
                    mOverlay.setCameraInfo(min,max,mCameraSource.getCameraFacing());
                } else {
                    mOverlay.setCameraInfo(max,min,mCameraSource.getCameraFacing());
                }
                mOverlay.clear();
            }
            mStartRequested = false;
        }
    }

    private class SurfaceCallback implements SurfaceHolder.Callback {
        @Override
        public void surfaceCreated(SurfaceHolder surface) {
            mSurfaceAvailable = true;
            try {
                startIfReady();
            } catch (IOException e) {
                Log.e(TAG,"Could not start camera source.",e);
            }
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder surface) {
            mSurfaceAvailable = false;
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder,int format,int width,int height) {
        }
    }

    @Override
    protected void onLayout(boolean changed,int left,int top,int right,int bottom) {
        int width = 320;
        int height = 240;
        if (mCameraSource != null) {
            Size size = mCameraSource.getPreviewSize();
            if (size != null) {
                width = size.getWidth();
                height = size.getHeight();
            }
        }

        // Swap width and height sizes when in portrait,since it will be rotated 90 degrees
        if (isPortraitMode()) {
            int tmp = width;
            width = height;
            height = tmp;
        }

        final int layoutWidth = right - left;
        final int layoutHeight = bottom - top;

        // Computes height and width for potentially doing fit width.
        int childWidth = layoutWidth;
        int childHeight = layoutHeight;
                //(int)(((float) layoutWidth / (float) width) * height);
/*
        // If height is too tall using fit width,does fit height instead.
        if (childHeight > layoutHeight) {
            childHeight = layoutHeight;
            childWidth = (int)(((float) layoutHeight / (float) height) * width);
        }*/

        for (int i = 0; i < getChildCount(); ++i) {
            getChildAt(i).layout(0,childWidth,childHeight);
        }

        try {
            startIfReady();
        } catch (IOException e) {
            Log.e(TAG,e);
        }
    }

    private boolean isPortraitMode() {
        int orientation = mContext.getResources().getConfiguration().orientation;
        if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
            return false;
        }
        if (orientation == Configuration.ORIENTATION_PORTRAIT) {
            return true;
        }

        Log.d(TAG,"isPortraitMode returning false by default");
        return false;
    }
}

现在，当我从 CameraSource 捕获图像时，它会对图像进行快照，但不会对我在表面视图上膨胀的图形叠加层进行快照。表面视图也不允许我从中获取位图。如果我尝试获取根视图的屏幕截图，那么它只会捕获图形叠加层而不是表面视图图像。

我的应用程序正在处理人脸过滤器 github 项目的逻辑（将根据要求提供链接） 我基本上被卡住了，因为我想同时捕获两者。

解决方法

您必须以这种方式将任何视图转换为位图，以获取特定视图的屏幕截图

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