Question

我正在开发一个应用程序，其中用户在半屏幕中看到自己的相机预览，而另一半半屏幕是静态图片我使用了意图但它会在全屏显示预览。有什么办法可以做到吗？

Answer 1

使用2个片段填充UI，每个片段占据屏幕的一半 - 将表面视图应用于底部视图并使用它来显示实时相机数据 - 并使用其他片段的方式。

快速回答因为我在工作：）

Answer 2

试试这个：

<强> main.xml中：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout" android:orientation="vertical"
    android:layout_width="match_parent" android:layout_height="match_parent" >
    <SurfaceView android:id="@+id/surfaceView" android:layout_width="0dp"
        android:layout_height="match_parent" android:layout_weight="1" />
    <ImageView android:id="@+id/imageView1" android:layout_width="0dp"
        android:layout_height="match_parent" android:layout_weight="1" />
</LinearLayout>

<强> Main.java ：

setContentView(R.layout.main);

preview = new Preview(this, (SurfaceView)findViewById(R.id.surfaceView));
preview.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));

((LinearLayout) findViewById(R.id.layout)).addView(preview);

<强> Preview.java ：

class Preview extends ViewGroup implements SurfaceHolder.Callback {
    SurfaceView mSurfaceView;
    SurfaceHolder mHolder;
    Size mPreviewSize;
    List<Size> mSupportedPreviewSizes;
    Camera mCamera;

    Preview(Context context, SurfaceView sv) {
        super(context);
        mSurfaceView = sv;
        mHolder = mSurfaceView.getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void setCamera(Camera camera) {
        mCamera = camera;
        if (mCamera != null) {
            mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
            requestLayout();

            Camera.Parameters params = mCamera.getParameters();

            List<String> focusModes = params.getSupportedFocusModes();
            if (focusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO)) {
                params.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
                mCamera.setParameters(params);
            }
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        setMeasuredDimension(width, height);

        if (mSupportedPreviewSizes != null)
            mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        if (changed && getChildCount() > 0) {
            final View child = getChildAt(0);

            final int width = r - l;
            final int height = b - t;
            int previewWidth = width;
            int previewHeight = height;
            if (mPreviewSize != null) {
                previewWidth = mPreviewSize.width;
                previewHeight = mPreviewSize.height;
            }

            if (width * previewHeight > height * previewWidth) {
                final int scaledChildWidth = previewWidth * height / previewHeight;
                child.layout((width - scaledChildWidth) / 2, 0,
                        (width + scaledChildWidth) / 2, height);
            } else {
                final int scaledChildHeight = previewHeight * width / previewWidth;
                child.layout(0, (height - scaledChildHeight) / 2, width, (height + scaledChildHeight) / 2);
            }
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {
        try {
            if (mCamera != null) mCamera.setPreviewDisplay(holder);
        } catch (IOException exception) {
            Log.e("AWAISSOOMRO_TAG", "IOException caused by setPreviewDisplay()", exception);
        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        if (mCamera != null) mCamera.stopPreview();
    }


    private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio = (double) w / h;
        if (sizes == null) return null;
        Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;
        int targetHeight = h;

        for (Size size : sizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        if (mCamera != null) {
            Camera.Parameters parameters = mCamera.getParameters();
            parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
            requestLayout();

            mCamera.setParameters(parameters);
            mCamera.startPreview();
        }
    }
}

SOURCE: https://github.com/josnidhin/Android-Camera-Example

在应用程序的半屏幕上显示Android摄像头预览

2 个答案: