如何在正方形Surface View(如Instagram)中将相机预览大小设置为方形宽高比

时间:2012-06-20 14:37:30

标签: android camera surfaceview

我正在尝试开发自己的相机活动,但我有一个问题,我无法解决......

我想要的是与Instagram相框非常相似的东西,这就是我得到的:

My image

当我得到这样的东西时:

Instagram image

和...

My second image

当我得到类似的东西时:

Instagram 2

我认为我只是使用

很好地管理SurfaceView和Camera预览
Camera.Parameters parameters = camera.getParameters();
camera.setDisplayOrientation(90);

和自定义SurfaceView:

public class SquaredSurfaceView extends SurfaceView {

private int width;
private int height;

public SquaredSurfaceView(Context context) {
    super(context);
}

public SquaredSurfaceView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public SquaredSurfaceView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    width = MeasureSpec.getSize(widthMeasureSpec);
    height = width;
    setMeasuredDimension(width, width);
}

public int getViewWidth() {
    return width;
}

public int getViewHeight() {
    return height;
}

}

我做错了什么? : - (

6 个答案:

答案 0 :(得分:18)

如前所述,您需要找到正确的预览大小(宽高比为1:1的大小),并且可能必须使用FrameLayout作为SurfacePreview。看起来你有宽高比问题可能你有正确的预览尺寸,但你把它放在一个不正确的布局。

另一个解决方案可能是(就像Instagram一样)让您的相机处于全尺寸,然后隐藏布局的某些区域,使其看起来像一个正方形。然后通过软件你必须剪切图像,使其成为一个真正的正方形。

希望这有助于你

答案 1 :(得分:6)

对我有用的解决方案是第二个答案,但因为我们需要旋转相机90º才能用HEIGTH切换WIDTH,就像这样......

   camera.setDisplayOrientation(90);
   Camera.Parameters params= camera.getParameters();
   surfaceView.getLayoutParams().width=params.getPreviewSize().height;
   surfaceView.getLayoutParams().height=params.getPreviewSize().width;

希望此解决方案有所帮助!! :d

答案 2 :(得分:2)

我的解决方案更像是构建一个方形蒙版,然后将其放在预览表面上。

主要需要3件事,首先是方框组件。我已经制作了一个自定义组件:

package com.example.squaredviewer;

import android.content.Context;
import android.util.AttributeSet;
import android.view.Display;
import android.view.WindowManager;
import android.widget.RelativeLayout;

/**
* Created by yadirhb on 14-08-2015.
*/
public class SquaredFrame extends RelativeLayout{
    public SquaredFrame(Context context, AttributeSet attrs) {
         super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
        setMeasuredDimension(size, size);
    }
}

根据您正在开发的Android API版本,您可能需要添加另一个构造函数重载。对于Kitkat来说,这很好。

第二步是构建布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:visibility="visible">

<RelativeLayout
    android:id="@+id/camera_preview"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="false"
    android:layout_alignParentTop="false"
    android:layout_centerInParent="true"
    android:background="#ffffff">

</RelativeLayout>

<LinearLayout
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="#131008">

    </LinearLayout>

    <com.example.squaredviewer.SquaredFrame
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true"></com.example.squaredviewer.SquaredFrame>

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="#131008" />
</LinearLayout>
</RelativeLayout>

注意RelativeLayout&#34; camera_preview&#34;是用于渲染预览的那个,它居中并且具有包含平方分量的LinearLayout。这实际上是&#34;掩码&#34;它涵盖了相机预览。 另请注意,除了透明的SquaredFrame外,其他两个背景颜色为黑色。

现在是表面视图,用于相机预览,其中表面根据纵横比调整大小。

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {

    private final String TAG = "PIC-FRAME";

    private SurfaceHolder mHolder;
    private Camera mCamera;
    private Display display;

    public CameraPreview(Activity context, Camera camera) {
        super(context);
        mCamera = camera;
        display = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();

        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
        // deprecated setting, but required on Android versions prior to 3.0
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        setKeepScreenOn(true);
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // empty. Take care of releasing the Camera preview in your activity.
        this.getHolder().removeCallback(this);
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // If your preview can change or rotate, take care of those events here.
        // Make sure to stop the preview before resizing or reformatting it.

        if (mHolder.getSurface() == null) {
            // preview surface does not exist
            return;
        }

        try {
            // stop preview before making changes
            mCamera.stopPreview();
            // set preview size and make any resize, rotate or
            // reformatting changes here
            // Now that the size is known, set up the camera parameters and begin
            // the preview.
            Camera.Parameters parameters = mCamera.getParameters();
            // You need to choose the most appropriate previewSize for your app
            Camera.Size previewSize = parametes.getSupportedPreviewSizes().get(0);
            parameters.setPreviewSize(previewSize.width, previewSize.height);


             // start preview with new settings
             mCamera.setParameters(parameters);

             // Set the holder size based on the aspect ratio
             int size = Math.min(display.getWidth(), display.getHeight());
             double ratio = (double) previewSize.width / previewSize.height;

             mHolder.setFixedSize((int)(size * ratio), size);
             mCamera.setPreviewDisplay(mHolder);
             mCamera.startPreview();

         } catch (Exception e) {
             Log.d(TAG, "Error starting camera preview: " + e.getMessage());
         }
      }
   }
}

现在一切都必须绑定在活动类

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_picture_taker);

    mDecorView = getWindow().getDecorView();

    //mCamera = a camera instance;

    // Create our Preview view and set it as the content of our activity.
    mPreview = new CameraPreview(this, mCamera);

    //Layout where camera preview is shown.
    RelativeLayout preview = (RelativeLayout) findViewById(R.id.camera_preview);
    //FrameLayout stack controllers inside and superpose them.
    preview.addView(mPreview, 0);

    // TODO
}

有点长,但我希望它不止一个。 : - )

答案 3 :(得分:2)

我在方形视图中遇到了同样的问题 - 只需将SurfaceView的相机尺寸设置为我想要绘制它的视图大小即可解决它。没有复杂的计算,它对我有用。请参阅我在此处对整个方法的回答:https://stackoverflow.com/a/39430615/5181489

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        ...
        params.setPreviewSize(viewParams.height, viewParams.width);
        camera.setParameters(params);

答案 4 :(得分:-1)

您可以使用它来获取pictureSize:

public static void initialCameraPictureSize(Context context, android.hardware.Camera.Parameters parameters) {

    List list = parameters.getSupportedPictureSizes();
    if(list != null) {
        android.hardware.Camera.Size size = null;
        Iterator iterator = list.iterator();
        do {
            if(!iterator.hasNext())
                break;
            android.hardware.Camera.Size size1 = (android.hardware.Camera.Size)iterator.next();
            if(Math.abs(3F * ((float)size1.width / 4F) - (float)size1.height) < 0.1F * (float)size1.width && (size == null || size1.height > size.height && size1.width < 3000))
                size = size1;
        } while(true);
        if(size != null)
            parameters.setPictureSize(size.width, size.height);
        else
            Log.e("CameraSettings", "No supported picture size found");
    }
}

答案 5 :(得分:-1)

这太难了。不容易。

第一件事:您定义2个黑色Linear Layout以获取您发布的用户界面。

第二件事:你需要将图片从全图片切割成方形图片。

如何剪切,您需要使用scaleBitmap方法。

或者您想要真正的自定义相机?可以登记here