[置顶] android利用zbar二维码扫描-(解决中文乱码及扫描区域定义)

写在最前（这是对上一篇博文的问题做的更新【android利用zbar二维码扫描】）

工程下载   zbarLib编译工程 工程下载0积分

bug

在2.3的系统中Holder需要设置type，否则会黑屏（感谢网友【（α ⒎待sんа）294439435】）

com.example.qu.MainActivity的第50行mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

今天发现

在com.example.qu.MainActivity中有个静态共享库没有加载进来，在低版本的ANDROID中会报错
修改方法：
在com.example.qu.MainActivity的第33行新增代码：
static {
System.loadLibrary("iconv");
}

前天早上登陆CSDN时候一条消息：一网友提出了两点疑惑

1.扫描框目前只是做的假象，是全屏的图片进行解析

2.中文乱码现象

各种查找，今天得以修复：及时共享给各位网友

补张图（有图有真相）

1.扫描框定义

/**
 *  2014-7-15   上午11:14:21
 *  Created By niexiaoqiang
 */

package com.example.qu;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;

/**
 * 查找框
 * @author niexiaoqiang
 */
public class FinderView extends View {
private static final long ANIMATION_DELAY = 30;
private Paint finderMaskPaint;
private int measureedWidth;
private int measureedHeight;

public FinderView(Context context) {
super(context);
init(context);
}

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

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawRect(leftRect, finderMaskPaint);
canvas.drawRect(topRect, finderMaskPaint);
canvas.drawRect(rightRect, finderMaskPaint);
canvas.drawRect(bottomRect, finderMaskPaint);
//画框
zx_code_kuang.setBounds(middleRect);
zx_code_kuang.draw(canvas);
if (lineRect.bottom < middleRect.bottom) {
zx_code_line.setBounds(lineRect);
lineRect.top = lineRect.top + lineHeight / 2;
lineRect.bottom = lineRect.bottom + lineHeight / 2;
} else {
lineRect.set(middleRect);
lineRect.bottom = lineRect.top + lineHeight;
zx_code_line.setBounds(lineRect);
}
zx_code_line.draw(canvas);
postInvalidateDelayed(ANIMATION_DELAY, middleRect.left, middleRect.top, middleRect.right, middleRect.bottom);
}

private Rect topRect = new Rect();
private Rect bottomRect = new Rect();
private Rect rightRect = new Rect();
private Rect leftRect = new Rect();
private Rect middleRect = new Rect();

private Rect lineRect = new Rect();
private Drawable zx_code_kuang;
private Drawable zx_code_line;
private int lineHeight;

private void init(Context context) {
int finder_mask = context.getResources().getColor(R.color.finder_mask);
finderMaskPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
finderMaskPaint.setColor(finder_mask);
zx_code_kuang = context.getResources().getDrawable(R.drawable.zx_code_kuang);
zx_code_line = context.getResources().getDrawable(R.drawable.zx_code_line);
lineHeight = 30;
}

//////////////新增该方法//////////////////////
/**
 * 根据图片size求出矩形框在图片所在位置，tip：相机旋转90度以后，拍摄的图片是横着的，所有传递参数时，做了交换
 * @param w
 * @param h
 * @return
 */
public Rect getScanImageRect(int w, int h) {
//先求出实际矩形
Rect rect = new Rect();
rect.left = middleRect.left;
rect.right = middleRect.right;
float temp = h / (float) measureedHeight;
rect.top = (int) (middleRect.top * temp);
rect.bottom = (int) (middleRect.bottom * temp);
return rect;
}

////////////////////////////////////
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
measureedWidth = MeasureSpec.getSize(widthMeasureSpec);
measureedHeight = MeasureSpec.getSize(heightMeasureSpec);
int borderWidth = measureedWidth / 2 + 100;
middleRect.set((measureedWidth - borderWidth) / 2, (measureedHeight - borderWidth) / 2, (measureedWidth - borderWidth) / 2 + borderWidth, (measureedHeight - borderWidth) / 2 + borderWidth);
lineRect.set(middleRect);
lineRect.bottom = lineRect.top + lineHeight;
leftRect.set(0, middleRect.top, middleRect.left, middleRect.bottom);
topRect.set(0, 0, measureedWidth, middleRect.top);
rightRect.set(middleRect.right, middleRect.top, measureedWidth, middleRect.bottom);
bottomRect.set(0, middleRect.bottom, measureedWidth, measureedHeight);
}
}

2.扫描界面

package com.example.qu;

import net.sourceforge.zbar.Config;
import net.sourceforge.zbar.Image;
import net.sourceforge.zbar.ImageScanner;
import net.sourceforge.zbar.Symbol;
import net.sourceforge.zbar.SymbolSet;
import android.app.Activity;
import android.graphics.Rect;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.PreviewCallback;
import android.hardware.Camera.Size;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.TextView;

public class MainActivity extends Activity implements SurfaceHolder.Callback {
private static String TAG = "xiaoqiang";
private Camera mCamera;
private SurfaceHolder mHolder;
private SurfaceView surface_view;
private ImageScanner scanner;
private Handler autoFocusHandler;
private AsyncDecode asyncDecode;

private FinderView finder_view;
private TextView textview;

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

private void init() {
surface_view = (SurfaceView) findViewById(R.id.surface_view);
finder_view = (FinderView) findViewById(R.id.finder_view);
textview = (TextView) findViewById(R.id.textview);
mHolder = surface_view.getHolder();
mHolder.addCallback(this);
scanner = new ImageScanner();
scanner.setConfig(0, Config.X_DENSITY, 3);
scanner.setConfig(0, Config.Y_DENSITY, 3);
autoFocusHandler = new Handler();
asyncDecode = new AsyncDecode();
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
if (mHolder.getSurface() == null) {
return;
}
try {
mCamera.stopPreview();
} catch (Exception e) {
}
try {
mCamera.setDisplayOrientation(90);
mCamera.setPreviewDisplay(mHolder);
mCamera.setPreviewCallback(previewCallback);
mCamera.startPreview();
mCamera.autoFocus(autoFocusCallback);
} catch (Exception e) {
Log.d("DBG", "Error starting camera preview: " + e.getMessage());
}
}

/**
 * 预览数据
 */
PreviewCallback previewCallback = new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera camera) {
if (asyncDecode.isStoped()) {
//Camera.Parameters parameters = camera.getParameters();
//Size size = parameters.getPreviewSize();
//Image barcode = new Image(size.width, size.height, "Y800");
//barcode.setData(data);
//asyncDecode = new AsyncDecode();
//asyncDecode.execute(barcode);
Camera.Parameters parameters = camera.getParameters();
Size size = parameters.getPreviewSize();
//图片是被旋转了90度的
Image source = new Image(size.width, size.height, "Y800");
Rect scanImageRect = finder_view.getScanImageRect(size.height, size.width);
//图片旋转了90度，将扫描框的TOP作为left裁剪
source.setCrop(scanImageRect.top, scanImageRect.left, scanImageRect.bottom, scanImageRect.right);
source.setData(data);
asyncDecode = new AsyncDecode();
asyncDecode.execute(source);

}
}
};

private class AsyncDecode extends AsyncTask<Image, Void, Void> {
private boolean stoped = true;
private String str = "";

@Override
protected Void doInBackground(Image... params) {
stoped = false;
StringBuilder sb = new StringBuilder();
Image barcode = params[0];
int result = scanner.scanImage(barcode);
if (result != 0) {
//mCamera.setPreviewCallback(null);
//mCamera.stopPreview();
SymbolSet syms = scanner.getResults();
for (Symbol sym : syms) {
switch (sym.getType()) {
case Symbol.CODABAR:
Log.d(TAG, "条形码  " + sym.getData());
//条形码  
sb.append(sym.getData() + "\n");
break;
case Symbol.CODE128:
//128编码格式二维码
Log.d(TAG, "128编码格式二维码:  " + sym.getData());
sb.append(sym.getData() + "\n");
break;
case Symbol.QRCODE:
//QR码二维码  
Log.d(TAG, "QR码二维码  :" + sym.getData());
sb.append(sym.getData() + "\n");
break;
case Symbol.ISBN10:
//ISBN10图书查询  
Log.d(TAG, "ISBN10图书查询  :   " + sym.getData());
sb.append(sym.getData() + "\n");
break;
case Symbol.ISBN13:
//ISBN13图书查询  
Log.d(TAG, "ISBN13图书查询   : " + sym.getData());
sb.append(sym.getData() + "\n");
break;
case Symbol.NONE:
Log.d(TAG, "未知   : " + sym.getData());
sb.append(sym.getData() + "\n");
break;
default:
Log.d(TAG, "其他:   " + sym.getData());
sb.append(sym.getData() + "\n");
break;
}
}
}
str = sb.toString();
return null;
}

@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
stoped = true;
if (null == str || str.equals("")) {
} else {
textview.setText(str);
}
}

public boolean isStoped() {
return stoped;
}
}

/**
 * 自动对焦回调
 */
AutoFocusCallback autoFocusCallback = new AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
autoFocusHandler.postDelayed(doAutoFocus, 1000);
}
};

//自动对焦
private Runnable doAutoFocus = new Runnable() {
public void run() {
if (null == mCamera || null == autoFocusCallback) {
return;
}
mCamera.autoFocus(autoFocusCallback);
}
};

@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
mCamera = Camera.open();
} catch (Exception e) {
mCamera = null;
}
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (mCamera != null) {
mCamera.setPreviewCallback(null);
mCamera.release();
mCamera = null;
}
}<pre name="code" class="html">

3.布局定义

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <SurfaceView
        android:id="@+id/surface_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <com.example.qu.FinderView
        android:id="@+id/finder_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <TextView
        android:id="@+id/textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/white"
        android:gravity="center_vertical"
        android:textColor="@color/rea" />

</FrameLayout>

一些资源文件请下载源码，如果没有积分可QQ联系312122330

//关于乱码的解决    zbarLib编译工程

1.我重新使用NDK编译了zbar的库，并对zbarlib\jni\zbar\qrcode\qrdectxt.c做了如下修改

/*This is the encoding the standard says is the default.*/
/*********************************************/
/*********   修改此处以支持中文                                      **********/
/*********************************************/
//latin1_cd=iconv_open("UTF-8","ISO8859-1");
latin1_cd = iconv_open("UTF-8", "GB18030");


/*But this one is often used, as well.*/
//sjis_cd = iconv_open("UTF-8", "SJIS");
sjis_cd = iconv_open("UTF-8", "GB2312");
/*********************************************/

2.NDK编译这块儿有麻烦的朋友，估计就要好好学习下了。 东西太多，不好些博文