我在横向模式下在 FrameLayout 中打开 android 相机，然后屏幕看起来像 -
但是当我在 FrameLayout 中的 ImageView 中打开相同的图像时，它看起来像 -
请忽略图片的内容和第二张图片中绘制的有趣方块。不同之处在于，第一个 CameraView 在整个屏幕中打开或高度触及屏幕头部，但第二个图像缩小图像以适应。
我希望第一个图像也像第二个一样工作，它应该适合定义的矩形。唯一的目标是 Camera View 和 ImageView 显示相同的 Look。
如果需要，我也可以更改整个布局。FacePreviewImageView 是我添加的图像。
第一个相机视图仅适用于 Android 相机，我正在添加到 android framelayout-
Camera mCamera = Camera.open(1);
FrameLayout layout = (FrameLayout) findViewById(R.id.ll2);
layout.addView(new CameraView());
我添加的第二帧像 -
layout.removeAllViews();
layout.addView(faceImageView);
faceView.setVisibility(View.GONE);
faceImageView.setVisibility(View.VISIBLE);
布局 XML 是 -
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:baselineAligned="false">
<LinearLayout
android:id="@+id/ll1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal">
</LinearLayout>
<FrameLayout
android:id="@+id/ll2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.5"
android:orientation="horizontal" >
<com.example.defaultfacetracker.FacePreviewImageView
android:id="@+id/facePreview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@android:drawable/toast_frame"
/>
</FrameLayout>
<LinearLayout
android:id="@+id/ll3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="horizontal" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:text="Process" />
</LinearLayout>
</LinearLayout>
我的 SurfaceHolder 看起来像 -
class Preview extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder;
Camera mCamera;
Camera.PreviewCallback previewCallback;
Preview(Context context, Camera.PreviewCallback previewCallback, Camera mCamera2) {
super(context);
this.previewCallback = previewCallback;
this.mCamera = mCamera2;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
// mCamera = Camera.open(1);
//mCamera.setDisplayOrientation(270);
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException exception) {
mCamera.release();
mCamera = null;
// TODO: add more exception handling logic here
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.05;
double targetRatio = (double) w / h;
if (sizes == null) return null;
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
// Try to find an size match aspect ratio and size
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);
}
}
// Cannot find the one match the aspect ratio, ignore the requirement
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) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
Camera.Parameters parameters = mCamera.getParameters();
List<Size> sizes = parameters.getSupportedPreviewSizes();
Size optimalSize = getOptimalPreviewSize(sizes, w, h);
parameters.setPreviewSize(optimalSize.width, optimalSize.height);
mCamera.setParameters(parameters);
if (previewCallback != null) {
mCamera.setPreviewCallbackWithBuffer(previewCallback);
Camera.Size size = parameters.getPreviewSize();
byte[] data = new byte[size.width*size.height*
ImageFormat.getBitsPerPixel(parameters.getPreviewFormat())/8];
mCamera.addCallbackBuffer(data);
}
// if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
// mCamera.setDisplayOrientation(90);
//
// } else {
// mCamera.setDisplayOrientation(0);
// }
mCamera.startPreview();
}
}