使SurfaceView大于屏幕（将相机预览适配到大于显示的SurfaceView）
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【中文标题】使SurfaceView大于屏幕（将相机预览适配到大于显示的SurfaceView）【英文标题】：Make a SurfaceView larger than the screen (Fitting a camera preview to a SurfaceView larger than the display) 【发布时间】：2013-06-25 06:38:59 【问题描述】：我有一个自定义相机应用程序，我希望任何预览尺寸都以全屏模式显示，而不会拉伸相机预览图像。 为此，我需要使surfaceView 大于屏幕以保持纵横比，因此实际上用户看到的比相机实际捕获的要少。
由于某种原因，我无法使SurfaceView 大于屏幕尺寸。
到目前为止我已经尝试过：
在surfaceChanged 方法中调整相机预览的大小
在onMeasure 方法中调整相机预览的大小
onLayoutmethod中调整大小
在活动中添加FLAG_LAYOUT_NO_LIMITS - info
为表面视图添加 android:clipChildren - info
在xml中设置宽度：android:layout_width="852px"
getWindow().setLayout(852, 1280); 在活动中
但没有任何成功 - 每次的行为都是相同的：它在 1 秒内看起来正常，然后它被拉伸。
代码如下：
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback
private static final int CAMERA_ROTATE_ANGLE = 90;
private SurfaceHolder cameraHolder;
private Camera androidHardCamera;
private Context context;
public CameraPreview(Context context)
super(context);
this.context = context;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
cameraHolder = getHolder();
cameraHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
cameraHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
public void setCamera(Camera camera)
this.androidHardCamera = camera;
if (androidHardCamera != null)
requestLayout();
@Override
public void surfaceCreated(SurfaceHolder holder)
// The Surface has been created, now tell the camera where to draw the preview.
try
if (androidHardCamera != null)
androidHardCamera.stopPreview();//this is needed for devices with API level < 14 (from doc.: Starting
// from API level 14, this method, aka setDisplayOrientation, can be called when preview is active.)
androidHardCamera.setDisplayOrientation(CAMERA_ROTATE_ANGLE);//force the preview Display Orientation
// to Portrait (rotate camera orientation/display to portrait)
//holder.setFixedSize(852, 1280);
androidHardCamera.setPreviewDisplay(holder);
androidHardCamera.startPreview();
catch (IOException e)
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
// 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 (cameraHolder.getSurface() == null)
// preview surface does not exist
return;
// stop preview before making changes
try
androidHardCamera.stopPreview();
catch (Exception e)
// ignore: tried to stop a non-existent preview
// set preview size and make any resize, rotate or
// reformatting changes here
FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) this.getLayoutParams();
layoutParams.height = 1280;
layoutParams.width = 852;
this.setLayoutParams(layoutParams);
//cameraHolder.setFixedSize(852, 1280);
requestLayout();
// start preview with new settings
try
androidHardCamera.setPreviewDisplay(cameraHolder);
androidHardCamera.startPreview();
catch (Exception e)
@Override
public void surfaceDestroyed(SurfaceHolder holder)
// @Override
// protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
// // super.onMeasure(widthMeasureSpec, heightMeasureSpec); //To change body of overridden methods use File | Settings | File Templates.
// //super.onMeasure(852, 1280);
// setMeasuredDimension(852, 1280);
//
public class MyActivity extends Activity
private Camera camera;
private CameraPreview previewCamera;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
setContentView(R.layout.camera_screen);
previewCamera = new CameraPreview(this);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(previewCamera);
//getWindow().setLayout(852, 1280);
@Override
protected void onResume()
// Create an instance of Camera
camera = getCameraInstance(1);
if (camera == null)
Toast.makeText(this, "Camera in use!", Toast.LENGTH_LONG).show();
else
previewCamera.setCamera(camera);
camera.stopPreview();
Camera.Parameters p = camera.getParameters();
p.setPreviewSize(176, 144);
// p.setPreviewSize(480, 800);
camera.setParameters(p);
startPreviewCamera();
super.onResume();
@Override
protected void onPause()
releaseCameraAndPreview();
super.onPause();
public Camera getCameraInstance(int cameraInstance)
Camera c = null;
try
c = Camera.open(cameraInstance);
catch (Exception e)
// Camera is not available (in use or does not exist)
System.out.println("exception: " + e);
return c;
public void startPreviewCamera()
//Force the preview Display Orientation to Portrait (rotate camera orientation/display to portrait)
camera.setDisplayOrientation(90);
camera.startPreview();
public void releaseCameraAndPreview()
if (camera != null)
camera.stopPreview(); // updating the preview surface
camera.setPreviewCallback(null);
// camera.lock(); //if we don't lock the camera, release() will fail on some devices
camera.release();
camera = null;
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_
android:layout_>
<!-- This is the container for the camera preview screen -->
<FrameLayout android:id="@+id/camera_preview"
android:layout_
android:layout_
android:clipChildren="false"
android:layout_weight="1"/>
</LinearLayout>
这是整个项目：https://www.dropbox.com/sh/96jih9kw5zmmnzy/z7VX16T30M
我正在 S3 设备上进行测试。在 S2 设备上似乎可以正常工作...我只是不知道该怎么做才能解决此问题...
更新 1
例如 Sony Xperia 的屏幕显示为 480 / 854。 我可以使用的预览尺寸之一是 176 / 144。
为了显示全屏尺寸，我需要将预览相机尺寸设置为 698 / 854 - 但我不知道如何设置此值以及在哪里设置。
下面的代码不起作用...相机预览被拉伸/拉长。
import android.app.Activity;
import android.graphics.Point;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.Display;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
public class CameraPreview extends Activity implements Preview.PreviewListener
private Preview mPreview;
private Camera mCamera;
FrameLayout preview;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
// Create our Preview view and set it as the content of our activity.
mPreview = new Preview(this);
preview = (FrameLayout) findViewById(R.id.surface_camera);
preview.addView(mPreview);
Display display = getWindowManager().getDefaultDisplay();
getDisplaySize(display);
private static Point getDisplaySize(final Display display)
final Point point = new Point();
try
display.getSize(point);
catch (java.lang.NoSuchMethodError ignore)
point.x = display.getWidth();
point.y = display.getHeight();
System.out.println("============: Screen " + point.x + "/" + point.y);
return point;
@Override
protected void onResume()
super.onResume();
mCamera = Camera.open(1);
mPreview.setCamera(mCamera, this);
@Override
protected void onPause()
super.onPause();
if (mCamera != null)
mPreview.setCamera(null, null);
mCamera.release();
mCamera = null;
@Override
public void onSurfaceChanged()
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) preview.getLayoutParams();
params.setMargins(0, -218, 0, 0);
preview.setLayoutParams(new FrameLayout.LayoutParams(480, 854));
preview.setLayoutParams(params);
preview.setVisibility(View.VISIBLE);
import android.content.Context;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.IOException;
import java.util.List;
class Preview extends SurfaceView implements SurfaceHolder.Callback
private SurfaceHolder mHolder;
private Camera mCamera;
private PreviewListener listener;
public static interface PreviewListener
void onSurfaceChanged();
Preview(Context context)
super(context);
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
public void setCamera(Camera camera, PreviewListener listener)
this.listener = listener;
mCamera = camera;
if (mCamera != null)
List<Camera.Size> mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
for (Camera.Size s : mSupportedPreviewSizes)
System.out.println("============: " + s.width + "/" + s.height);
requestLayout();
public void surfaceCreated(SurfaceHolder holder)
// The Surface has been created, acquire the camera and tell it where
// to draw.
try
if (mCamera != null)
mCamera.setPreviewDisplay(holder);
catch (IOException exception)
Log.e("Error: ", "IOException caused by setPreviewDisplay()", exception);
public void surfaceDestroyed(SurfaceHolder holder)
// Surface will be destroyed when we return, so stop the preview.
if (mCamera != null)
mCamera.stopPreview();
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h)
mCamera.stopPreview(); // pe Xpedia daca nu pui asta crapa la setDisplayOrientation
// Now that the size is known, set up the camera parameters and beginthe preview.
Camera.Parameters parameters = mCamera.getParameters();
mCamera.setDisplayOrientation(90);
parameters.setPreviewSize(176, 144);
requestLayout();
mCamera.setParameters(parameters);
mCamera.startPreview();
// @Override
// protected void onSizeChanged(\int w, int h, int oldw, int oldh)
// super.onSizeChanged(w, h, oldw, oldh);
// //setLayoutParams(new LayoutParams((int)RATIO * w, w));
//
// FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) getLayoutParams();
// setLayoutParams(new FrameLayout.LayoutParams(960, 1280));
// params.setMargins(0, -120, 0,0);
// setLayoutParams(params);
//
// //preview.setVisibility(View.VISIBLE);
//
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
super.onMeasure(widthMeasureSpec, heightMeasureSpec); //To change body of overridden methods use File | Settings | File Templates.
// FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) getLayoutParams();
// setLayoutParams(new FrameLayout.LayoutParams(698, 854));
// params.setMargins(0, -218, 0,0);
// setLayoutParams(params);
//https://***.com/questions/11853297/change-size-of-android-custom-surfaceview
@Override
public void onLayout(boolean changed, int left, int top, int right, int bottom)
if (changed)
//setLayoutParams();
listener.onSurfaceChanged();
//(this).layout(0, 0, viewWidth , viewHeight);
这是一个类测试，它根据显示屏尺寸和相机预览尺寸计算正确的表面视图尺寸：
public class Test
/**
* Determine proper width to be used for surface view in order to not stretch the camera live preview.
*/
public static void main(String[] args)
// camera preview size:
int surfaceViewWidth = 176;
int surfaceViewHeight = 144;
int holder;
if (surfaceViewWidth > surfaceViewHeight)
holder = surfaceViewWidth;
surfaceViewWidth = surfaceViewHeight;
surfaceViewHeight = holder;
//device screen display sizes:
int width = 480;
int height = 854;
double sc1 = (double) width / surfaceViewWidth;
double sc2 = (double) height / surfaceViewHeight;
double rez;
if (sc1 > sc2)
rez = sc1;
else
rez = sc2;
System.out.println("Width/height: " + (int) (surfaceViewWidth * rez) + "/" + (int) (surfaceViewHeight * rez)); // size of the preview size we need to set
System.out.println(((int) (surfaceViewWidth * rez))-width); // difference between preview size and device screen size = whit how much is bigger the preview size than screen size
【问题讨论】：
这里还有另一个使用 TextureView 的答案：***.com/questions/17019588/… 值得一试 android api 14+ @Sam：很棒的提示；对于那些正在寻找从 API 级别 14 开始的解决方案的人来说，它可能非常有用 更新：SurfaceViews 或纹理我从来没有得到令人满意的结果，但纹理视图方法效果很好（对变换矩阵进行了一些适当的调整） 试试这个：@Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) holder.setSizeFromLayout(); @Deepak ...来自 Javadoc：“允许表面根据其容器的布局调整大小（这是默认设置）”...显然调用 setSizeFromLayout() 将毫无意义... ? 【参考方案1】：首先，消除崩溃源：在 onResume 中调用 startPreviewCamera。 相机预览应在 SurfaceHolder.Callback 方法中启动。
那么您应该知道，您只能将预览大小设置为由 Camera.Parameters.getSupportedPreviewSizes 报告的大小。这些尺寸很可能会小于或等于设备的屏幕尺寸。
然后你只需调用
Camera.Parameters p = camera.getParameters();
p.setPreviewSize(w, h); // one of supported sizes
camera.setParameters(p);
然后预览的 Surface 将具有该大小（可能已旋转和 w/h 交换）。并且这个表面会在绘制时被 Android 重新调整为 CameraPreview 视图的大小，因此如何设置 CameraPreview 的大小也很重要。
您可以通过调用来设置 CameraPreview 的固定大小
previewCamera.setLayoutParams(new FrameLayout.LayoutParams(w, h));
简而言之，您可以在 Camera.setParameters 中设置请求的预览大小，并根据需要调整预览视图的大小，可能与预览的大小相同，这是您的要求。然后，您的预览视图可能等于屏幕大小或更小（假设相机不提供大于屏幕的预览）。如果相机提供比屏幕更大的预览，您仍然可以调用 preview.setX、preview.setY 来移动它。
【讨论】：
我已经更新了问题，并回复了您的回复。我知道我需要使用其中一种可用的预览尺寸——在代码中，我为我测试过的手机硬编码了正确的预览尺寸值。我有一个列出所有预览尺寸的代码，我从那里开始使用它的纵横比与设备屏幕纵横比不同。 你能告诉我我需要在哪里调用“previewCamera.setLayoutParams”吗？ :| @PointerNull - 您的“onCreate”答案是否假定在中断后不必重置参数（电话、切换到另一个凸轮应用程序等）。不应该在“onResume”还是“surfaceCreated”中？ 我的情况非常相似，setLayoutParams 解决方案在某些设备（s2、s4、s5）上运行良好，正如@Paul 在其他设备中所描述的那样（如 s3 mini、galaxy tab 2、kindle fire高清等）。 @PointerNull ***.com/questions/41072170/…以上是关于使SurfaceView大于屏幕（将相机预览适配到大于显示的SurfaceView）的主要内容，如果未能解决你的问题，请参考以下文章