相机预览肖像setParameters失败

概述我想获得全屏人像相机预览.使用Google的示例,预览在纵向屏幕上以横向格式进行.当我将预览设置为480x864(与工作景观尺寸相反)时,出现setParametersfailed错误.我已经阅读了所有可以找到的StackOverflow,但是我无法弄清楚为什么横向支持的尺寸无法通过纵向显示.我也找不到强迫全

我想获得全屏人像相机预览.使用Google的示例,预览在纵向屏幕上以横向格式进行.当我将预览设置为480 x 864(与工作景观尺寸相反)时,出现setParameters Failed错误.

我已经阅读了所有可以找到的StackOverflow,但是我无法弄清楚为什么横向支持的尺寸无法通过纵向显示.我也找不到强迫全屏人像预览的方法.手机上的“相机”应用可提供全屏人像预览,因此我知道这不是硬件限制.

我正在使用运行Android 2.3.3的DroID 3进行测试

我将不胜感激任何建议.

public class SimplePrevIEw extends VIEwGroup implements SurfaceHolder.Callback {private final String TAG = "PrevIEw";SurfaceVIEw mSurfaceVIEw;SurfaceHolder mHolder;Size mPrevIEwSize;List<Size> mSupportedPrevIEwSizes;Camera mCamera;int cameraID;Activity activity;public SimplePrevIEw(Activity context, int defaultCamera) {    super(context);    activity = context;    cameraID = defaultCamera;    mSurfaceVIEw = new SurfaceVIEw(context);    addVIEw(mSurfaceVIEw);    // Install a SurfaceHolder.Callback so we get notifIEd when the    // underlying surface is created and destroyed.    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();    }}public voID switchCamera(Camera camera) {    setCamera(camera);    try {        camera.setPrevIEwdisplay(mHolder);    } catch (IOException exception) {        Log.e(TAG, "IOException caused by setPrevIEwdisplay()", exception);    }    Camera.Parameters parameters = camera.getParameters();    parameters.setPrevIEwSize(mPrevIEwSize.wIDth, mPrevIEwSize.height);    requestLayout();    camera.setParameters(parameters);}@OverrIDeprotected voID onMeasure(int wIDthMeasureSpec, int heightmeasureSpec) {    // We purposely disregard child measurements because act as a    // wrapper to a SurfaceVIEw that centers the camera prevIEw instead    // of stretching it.    final int wIDth = resolveSize(getSuggestedMinimumWIDth(),            wIDthMeasureSpec);    final int height = resolveSize(getSuggestedMinimumHeight(),            heightmeasureSpec);    Log.i(TAG, "setting VIEw measured dimensions to wIDth: " + wIDth            + "  height: " + height);    setMeasuredDimension(wIDth, height);    if (mSupportedPrevIEwSizes != null) {        mPrevIEwSize = getoptimalPrevIEwSize(mSupportedPrevIEwSizes, wIDth,                height);    }}@OverrIDeprotected 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;        }        // Center the child SurfaceVIEw within the parent.        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 surfaceDestroyed(SurfaceHolder holder) {    // Surface will be destroyed when we return, so stop the prevIEw.    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;    // Try to find an size match aspect ratio and size    for (Size size : sizes) {        Log.v(TAG, "  wIDth: " + size.wIDth + "  height: " + size.height);        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);            }        }    }    Log.i(TAG, "optimal prevIEw wIDth: " + optimalSize.wIDth + "  height: "            + optimalSize.height);    return optimalSize;}public voID surfaceCreated(SurfaceHolder holder) {    // The Surface has been created, acquire the camera and tell it where    // to draw.    try {        if (mCamera != null) {            final int wIDth = getWIDth();            final int height = getHeight();            Log.i(TAG, "vIEw wIDth: " + wIDth + "  height: " + height);            if (height > wIDth) {                Log.i(TAG, "in portrait mode so rotate camera prevIEw");                // THis line fixed the camera display orIEntation. seems to                // have to be called before setPrevIEwdisplay()                mCamera.setdisplayOrIEntation(90);            }            mCamera.setPrevIEwdisplay(holder);        }    } catch (IOException exception) {        Log.e(TAG, "IOException caused by setPrevIEwdisplay()", exception);    }}/** * orIEntation and rotation work done here. Now that the size is kNown, set * up the camera parameters and begin the prevIEw. */public voID surfaceChanged(SurfaceHolder holder, int format, int w, int h) {    if (mCamera != null) {        mCamera.stopPrevIEw();        Camera.Parameters parameters = mCamera.getParameters();        // mCamera.setdisplayOrIEntation(90);        final int wIDth = getWIDth();        final int height = getHeight();        Log.i(TAG, "vIEw wIDth: " + wIDth + "  height: " + height);        if (height > wIDth) {            Log.i(TAG, "portrait:  setting prevIEw wIDth: " + 480                    + "  height: " + 864);            parameters.setPrevIEwSize(480, 864);            // had no effect            parameters.set("orIEntation", "portrait");        } else {            Log.i(TAG, "landscape:  setting prevIEw wIDth: "                    + mPrevIEwSize.wIDth + "  height: "                    + mPrevIEwSize.height);            parameters.setPrevIEwSize(mPrevIEwSize.wIDth,                    mPrevIEwSize.height);        }        requestLayout();                    // *** following line throws setParameters Failed error ***        mCamera.setParameters(parameters);        mCamera.startPrevIEw();    }}}

以及来自Activity的onCreate()的调用：

prevIEw = new SimplePrevIEw(this, defaultCameraID);    setContentVIEw(prevIEw);

解决方法:

试试这个代码：

package com.example.dragme;import java.io.IOException;import java.util.List;import androID.app.Activity;import androID.content.Context;import androID.content.res.Configuration;import androID.harDWare.Camera;import androID.os.Build;import androID.util.Log;import androID.vIEw.display;import androID.vIEw.Surface;import androID.vIEw.SurfaceHolder;import androID.vIEw.SurfaceVIEw;public class CameraPrevIEw extends SurfaceVIEw implements SurfaceHolder.Callback {    private SurfaceHolder mHolder;    public Camera mCamera;    private static boolean DEBUGGING = true;    private static final String LOG_TAG = "CameraPrevIEwSample";    private static final String CAMERA_ParaM_ORIENTATION = "orIEntation";    private static final String CAMERA_ParaM_LANDSCAPE = "landscape";    private static final String CAMERA_ParaM_PORTRAIT = "portrait";    protected Activity mActivity;    protected List<Camera.Size> mPrevIEwSizeList;    protected List<Camera.Size> mPictureSizeList;    protected Camera.Size mPrevIEwSize;    protected Camera.Size mPictureSize;    public CameraPrevIEw(Context context, Camera camera) {        super(context);        mActivity=(Activity)context;        mCamera = camera;        // 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);    }    public voID surfaceCreated(SurfaceHolder holder) {        // The Surface has been created, Now tell the camera where to draw the prevIEw.        try {            mCamera.setPrevIEwdisplay(holder);            mCamera.startPrevIEw();        } catch (IOException e) {            Log.d("Cameraview", "Error setting camera prevIEw: " + e.getMessage());        }    }    public voID surfaceDestroyed(SurfaceHolder holder) {        // empty. Take care of releasing the Camera prevIEw in your activity.    }    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;        }        // stop prevIEw before making changes        try {           // mCamera.stopPrevIEw();        } catch (Exception e){          // ignore: trIEd to stop a non-existent prevIEw        }        // set prevIEw size and make any resize, rotate or        // reformatting changes here        // start prevIEw with new settings        try {            Camera.Parameters cameraParams = mCamera.getParameters();            boolean portrait = isPortrait();            configureCameraParameters(cameraParams, portrait);            mCamera.setPrevIEwdisplay(mHolder);            mCamera.startPrevIEw();        } catch (Exception e){            Log.d("Cameraview", "Error starting camera prevIEw: " + e.getMessage());        }    }    public voID onPause() {        if (null == mCamera) {            return;        }        mCamera.stopPrevIEw();        mCamera.release();        mCamera = null;    }    protected voID configureCameraParameters(Camera.Parameters cameraParams, boolean portrait) {        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.FROYO) { // for 2.1 and before            if (portrait) {                cameraParams.set(CAMERA_ParaM_ORIENTATION, CAMERA_ParaM_PORTRAIT);            } else {                cameraParams.set(CAMERA_ParaM_ORIENTATION, CAMERA_ParaM_LANDSCAPE);            }        } else { // for 2.2 and later            int angle;            display display = mActivity.getwindowManager().getDefaultdisplay();            switch (display.getRotation()) {                case Surface.ROTATION_0: // This is display orIEntation                    angle = 90; // This is camera orIEntation                    break;                case Surface.ROTATION_90:                    angle = 0;                    break;                case Surface.ROTATION_180:                    angle = 270;                    break;                case Surface.ROTATION_270:                    angle = 180;                    break;                default:                    angle = 90;                    break;            }            Log.v(LOG_TAG, "angle: " + angle);            mCamera.setdisplayOrIEntation(angle);        }        cameraParams.setPrevIEwSize(mPrevIEwSize.wIDth, mPrevIEwSize.height);        cameraParams.setPictureSize(mPictureSize.wIDth, mPictureSize.height);        if (DEBUGGING) {            Log.v(LOG_TAG, "PrevIEw Actual Size - w: " + mPrevIEwSize.wIDth + ", h: " + mPrevIEwSize.height);            Log.v(LOG_TAG, "Picture Actual Size - w: " + mPictureSize.wIDth + ", h: " + mPictureSize.height);        }        mCamera.setParameters(cameraParams);    }    public boolean isPortrait() {        return (mActivity.getResources().getConfiguration().orIEntation == Configuration.ORIENTATION_PORTRAIT);    }}

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