Android ZXing在Xoom上工作？

有人知道ZXing条形码扫描仪库是否在Xoom上工作吗？我在ZXing Google Group上发现了一个帖子：

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但仍然没有答案。任何帮助都将不胜感激

核心库独立于任何特定设备或平台，因此“是”。

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条形码扫描仪应用程序版本3.6已确认可在Xoom上运行。

核心库独立于任何特定设备或平台，因此“是”。

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条形码扫描器应用程序版本3.6已确认可在Xoom上工作。

是的，它可以工作。代码是用java编写的，因此几乎可以与任何设备一起使用。永远，如果你尝试这个例子，它使用旧的安卓2.x，它不被视为与蜂窝工作。因此，您必须创建自己的相机包装。起作用的是图书馆，ZXing-1.7.zip

下面是使其工作所需的代码。请注意，它将在标题中显示条形码的内容。因此，使其工作所需的步骤是：

在eclipse中创建一个名为 “CameraPreview”并将包名设置为“com.example.android.api.graphics”

从中获取ZXing-1.7.zip

从目录中提取名为“com”的文件夹 “ZXing-1.7.zip\ZXing\core\src”

将Eclipse中提取的文件夹拖放到文件夹中 src:“CameraPreview\src”。它会问你是否要替换“com”文件夹，说“是”

还可以获得一份“ZXing-1.7.zip\ZXing\android\src\com\google\ZXing\client\android\PlanarYUVLuminanceSource.java”的副本，并将其放入名为“com.google.ZXing.client.android”的新包中（您必须创建一个新包）

将代码“CameraPreviewActivity.java”替换为以下代码：

CameraPreviewActivity.java:

/* Copyright (C) 2007 The Android Open Source Project */

package com.example.android.apis.graphics;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.client.android.PlanarYUVLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;

// ----------------------------------------------------------------------

public class CameraPreviewActivity extends Activity {
    Preview mPreview;
    Camera mCamera;
    MultiFormatReader multiFormatReader;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Create a RelativeLayout container that will hold a SurfaceView,
        // and set it as the content of our activity.
        mPreview = new Preview(this);
        setContentView(mPreview);

        // Setup ZXing.
        multiFormatReader = new MultiFormatReader();
        CameraPreviewActivity.this.getActionBar().setTitle("");
    }

    @Override
    protected void onResume() {
        super.onResume();

        mCamera = Camera.open();
        mCamera.setPreviewCallback(new Camera.PreviewCallback() {
            public void onPreviewFrame(byte[] data, Camera camera) {

                Camera.Size size = camera.getParameters().getPreviewSize();
                PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(data, size.width, size.height, 0, 0,
                        size.width, size.height, false);
                BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
                try {
                    Result r = multiFormatReader.decode(bitmap);
                    CameraPreviewActivity.this.getActionBar().setTitle(r.getText());
                } catch (ReaderException re) {
                  // continue
                }
            }
        });
        mPreview.setCamera(mCamera);
    }

    @Override
    protected void onPause() {
        super.onPause();

        // Because the Camera object is a shared resource, it's very
        // important to release it when the activity is paused.
        if (mCamera != null) {
            mPreview.setCamera(null);
            mCamera.setPreviewCallback(null);
            mCamera.release();
            mCamera = null;
        }
    }
}

/* Copyright (C) 2007 The Android Open Source Project */

package com.example.android.apis.graphics;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;

import java.io.IOException;
import java.util.List;

// ----------------------------------------------------------------------

/**
 * A simple wrapper around a Camera and a SurfaceView that renders a centered preview of the Camera
 * to the surface. We need to center the SurfaceView because not all devices have cameras that
 * support preview sizes at the same aspect ratio as the device's display.
 */
class Preview extends ViewGroup implements SurfaceHolder.Callback {
    private final String TAG = "Preview";

    SurfaceView mSurfaceView;
    SurfaceHolder mHolder;
    Size mPreviewSize;
    List<Size> mSupportedPreviewSizes;
    Camera mCamera;

    Preview(Context context) {
        super(context);

        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);
    }

    @Override
    protected 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);
        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;
            }

            // 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 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(TAG, "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();
        }
    }


    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) {
            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();
        parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
        requestLayout();

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

创建一个名为Preview.java:

/* Copyright (C) 2007 The Android Open Source Project */

package com.example.android.apis.graphics;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.client.android.PlanarYUVLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;

// ----------------------------------------------------------------------

public class CameraPreviewActivity extends Activity {
    Preview mPreview;
    Camera mCamera;
    MultiFormatReader multiFormatReader;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Create a RelativeLayout container that will hold a SurfaceView,
        // and set it as the content of our activity.
        mPreview = new Preview(this);
        setContentView(mPreview);

        // Setup ZXing.
        multiFormatReader = new MultiFormatReader();
        CameraPreviewActivity.this.getActionBar().setTitle("");
    }

    @Override
    protected void onResume() {
        super.onResume();

        mCamera = Camera.open();
        mCamera.setPreviewCallback(new Camera.PreviewCallback() {
            public void onPreviewFrame(byte[] data, Camera camera) {

                Camera.Size size = camera.getParameters().getPreviewSize();
                PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(data, size.width, size.height, 0, 0,
                        size.width, size.height, false);
                BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
                try {
                    Result r = multiFormatReader.decode(bitmap);
                    CameraPreviewActivity.this.getActionBar().setTitle(r.getText());
                } catch (ReaderException re) {
                  // continue
                }
            }
        });
        mPreview.setCamera(mCamera);
    }

    @Override
    protected void onPause() {
        super.onPause();

        // Because the Camera object is a shared resource, it's very
        // important to release it when the activity is paused.
        if (mCamera != null) {
            mPreview.setCamera(null);
            mCamera.setPreviewCallback(null);
            mCamera.release();
            mCamera = null;
        }
    }
}

/* Copyright (C) 2007 The Android Open Source Project */

package com.example.android.apis.graphics;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;

import java.io.IOException;
import java.util.List;

// ----------------------------------------------------------------------

/**
 * A simple wrapper around a Camera and a SurfaceView that renders a centered preview of the Camera
 * to the surface. We need to center the SurfaceView because not all devices have cameras that
 * support preview sizes at the same aspect ratio as the device's display.
 */
class Preview extends ViewGroup implements SurfaceHolder.Callback {
    private final String TAG = "Preview";

    SurfaceView mSurfaceView;
    SurfaceHolder mHolder;
    Size mPreviewSize;
    List<Size> mSupportedPreviewSizes;
    Camera mCamera;

    Preview(Context context) {
        super(context);

        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);
    }

    @Override
    protected 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);
        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;
            }

            // 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 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(TAG, "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();
        }
    }


    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) {
            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();
        parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
        requestLayout();

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

/*版权所有（C）2007安卓开源项目*/
包com.example.android.api.graphics；
导入android.content.Context；
导入android.hardware.Camera；
导入android.hardware.Camera.Size；
导入android.util.Log；
导入android.view.SurfaceHolder；
导入android.view.SurfaceView；
导入android.view.view；
导入android.view.ViewGroup；
导入java.io.IOException；
导入java.util.List；
// ----------------------------------------------------------------------
/**
*围绕摄影机的简单包装和渲染摄影机居中预览的SurfaceView
*浮出水面。我们需要将SurfaceView置于中心位置，因为并非所有设备都有摄像头
*支持与设备显示器具有相同纵横比的预览大小。
*/
类预览扩展视图组实现SurfaceHolder.Callback{
私有最终字符串标记=“预览”；
SurfaceView mSurfaceView；
表面粗糙度；
大小mPreviewSize；
列出MSSupportedPreviewsizes；
麦克默拉照相机；
预览（上下文）{
超级（上下文）；
mSurfaceView=新的SurfaceView（上下文）；
addView（mSurfaceView）；
//安装SurfaceHolder.Callback，以便在
//创建和破坏下垫面。
mHolder=mSurfaceView.getHolder（）；
mHolder.addCallback（this）；
mHolder.setType（SurfaceHolder.SURFACE\u TYPE\u PUSH\u缓冲区）；
}
公共摄像机（摄像机）{
mCamera=摄像机；
if（mCamera！=null）{
mSupportedPreviewSizes=mCamera.getParameters（）.getSupportedPreviewSizes（）；
requestLayout（）；
}
}
公共摄像机（摄像机）{
设置摄像机（摄像机）；
试一试{
摄像头。设置预览显示（mHolder）；
}捕获（IOException异常）{
Log.e（标记“setPreviewDisplay（）引起的IOException”，exception）；
}
Camera.Parameters=Camera.getParameters（）；
parameters.setPreviewSize（mPreviewSize.width、mPreviewSize.height）；
requestLayout（）；
设置参数（参数）；
}
@凌驾
测量时的保护空隙（内部宽度测量等级、内部高度测量等级）{
//我们故意忽略儿童的测量，因为这是一种
//包装到将摄影机预览居中的SurfaceView
//我想把它拉长。
最终整数宽度=resolveSize（getSuggestedMinimumWidth（），widthMeasureSpec）；
最终整数高度=resolveSize（getSuggestedMinimumHeight（），heightMeasureSpec）；
设置测量尺寸（宽度、高度）；
if（mSupportedPreviewSizes！=null）{
mPreviewSize=getOptimalPreviewSize（MSSupportedPreviewSize、宽度、高度）；
}
}
@凌驾
仅受保护的void布局（布尔值已更改、int l、int t、int r、int b）{
如果（已更改&&getChildCount（）>0）{
最终视图子对象=getChildAt（0）；
最终整数宽度=r-l；
最终内部高度=b-t；
int previewWidth=宽度；
亮度=高度；
if（mPreviewSize！=null）{
previewWidth=mPreviewSize.width；
PreviewView=mPreviewSize.height；
}
//将子曲面视图居中放置在父曲面视图中。
如果（宽度*预览宽度>高度*预览宽度）{
最终整数缩放儿童宽度=预览宽度*高度/预览宽度；
布局（（宽度-scaledChildWidth）/2,0，
（宽度+缩放儿童宽度）/2，高度）；
}否则{
最终int scaledChildHeight=预览视图*宽度/预览宽度；
布局（0，（高度-缩放儿童高度）/2，
宽度（高度+缩放儿童高度）/2）；
}
}
}
已创建的公共空白表面（表面持有人）{
//曲面已创建，获取摄影机并告知其位置
//画。
试一试{
if（mCamera！=null）{
mCamera.setPreviewDisplay（支架）；
}
}捕获（IOException异常）{