package com.dm.zbar.android.scanner;
public class ZBarScannerActivity extends Activity implements Camera.PreviewCallback, ZBarConstants {
private static final String TAG = "ZBarScannerActivity";
private CameraPreview mPreview;
private Camera mCamera;
private ImageScanner mScanner;
private Handler mAutoFocusHandler;
private boolean mPreviewing = true;
static {
System.loadLibrary("iconv");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(!isCameraAvailable()) {
// Cancel request if there is no rear-facing camera.
cancelRequest();
return;
}
// Hide the window title.
//requestWindowFeature(Window.FEATURE_NO_TITLE);
//getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
mAutoFocusHandler = new Handler();
// Create and configure the ImageScanner;
setupScanner();
// Create a RelativeLayout container that will hold a SurfaceView,
// and set it as the content of our activity.
mPreview = new CameraPreview(this, this, autoFocusCB);
setContentView(mPreview);
}
public void setupScanner() {
mScanner = new ImageScanner();
mScanner.setConfig(0, Config.X_DENSITY, 3);
mScanner.setConfig(0, Config.Y_DENSITY, 3);
int[] symbols = getIntent().getIntArrayExtra(SCAN_MODES);
if (symbols != null) {
mScanner.setConfig(Symbol.NONE, Config.ENABLE, 0);
for (int symbol : symbols) {
mScanner.setConfig(symbol, Config.ENABLE, 1);
}
}
}
@Override
protected void onResume() {
super.onResume();
// Open the default i.e. the first rear facing camera.
mCamera = Camera.open();
if(mCamera == null) {
// Cancel request if mCamera is null.
cancelRequest();
return;
}
mPreview.setCamera(mCamera);
mPreview.showSurfaceView();
mPreviewing = true;
}
@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.cancelAutoFocus();
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mCamera.release();
// According to Jason Kuang on http://stackoverflow.com/questions/6519120/how-to-recover-camera-preview-from-sleep,
// there might be surface recreation problems when the device goes to sleep. So lets just hide it and
// recreate on resume
mPreview.hideSurfaceView();
mPreviewing = false;
mCamera = null;
}
}
public boolean isCameraAvailable() {
PackageManager pm = getPackageManager();
return pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);
}
public void cancelRequest() {
Intent dataIntent = new Intent();
dataIntent.putExtra(ERROR_INFO, "Camera unavailable.");
setResult(Activity.RESULT_CANCELED, dataIntent);
finish();
}
public void onPreviewFrame(byte[] data, Camera camera) {
Camera.Parameters parameters = camera.getParameters();
Camera.Size size = parameters.getPreviewSize();
Image barcode = new Image(size.width, size.height, "Y800");
barcode.setData(data);
int result = mScanner.scanImage(barcode);
if (result != 0) {
mCamera.cancelAutoFocus();
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mPreviewing = false;
SymbolSet syms = mScanner.getResults();
for (Symbol sym : syms) {
String symData = sym.getData();
if (!TextUtils.isEmpty(symData)) {
Intent dataIntent = new Intent();
dataIntent.putExtra(SCAN_RESULT, symData);
dataIntent.putExtra(SCAN_RESULT_TYPE, sym.getType());
setResult(Activity.RESULT_OK, dataIntent);
finish();
break;
}
}
}
}
private Runnable doAutoFocus = new Runnable() {
public void run() {
if(mCamera != null && mPreviewing) {
mCamera.autoFocus(autoFocusCB);
}
}
};
// Mimic continuous auto-focusing
Camera.AutoFocusCallback autoFocusCB = new Camera.AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
mAutoFocusHandler.postDelayed(doAutoFocus, 1000);
}
};
SurfaceView mSurfaceView;
SurfaceHolder mHolder;
Size mPreviewSize;
List<Size> mSupportedPreviewSizes;
Camera mCamera;
PreviewCallback mPreviewCallback;
AutoFocusCallback mAutoFocusCallback;
CameraPreview(Context context, PreviewCallback previewCallback, AutoFocusCallback autoFocusCb) {
super(context);
mPreviewCallback = previewCallback;
mAutoFocusCallback = autoFocusCb;
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) {
//Changes********
mCamera.setDisplayOrientation(90);
mCamera.getParameters().getMaxNumFocusAreas();
mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
requestLayout();
}
}
@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 hideSurfaceView() {
mSurfaceView.setVisibility(View.INVISIBLE);
}
public void showSurfaceView() {
mSurfaceView.setVisibility(View.VISIBLE);
}
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.cancelAutoFocus();
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) {
if (holder.getSurface() == null){
// preview surface does not exist
return;
}
if (mCamera != null) {
// 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.setDisplayOrientation(90);
mCamera.setParameters(parameters);
mCamera.setPreviewCallback(mPreviewCallback);
mCamera.startPreview();
mCamera.autoFocus(mAutoFocusCallback);
}
}
}
请帮助我获取相机预览尺寸的场景。
我得到了一个设备的小表面视图。其实我想要全屏摄像头预览扫描二维码
>
如果您是说相机没有占据整个屏幕,那么请尝试更改
android:layout_width="match_parent"
android:layout_height="match_parent"
surfaceview
和parent_layout
的
mScannerView = new ZBarScannerView(this) {
/**
* this will alter the scanning area
**/
@Override
protected IViewFinder createViewFinderView(Context context) {
return new CustomViewFinderView(context);
}
};
private class CustomViewFinderView extends ViewFinderView {
Context context;
public CustomViewFinderView(Context context) {
super(context);
this.context = context;
setLaserEnabled(true);
}
@Override
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (getFramingRect() != null) {
updateFrameRect();
setBorderColor(ContextCompat.getColor(context, R.color.colorPrimary));
}
}
private void updateFrameRect() {
Point viewResolution = new Point(this.getWidth(), this.getHeight());
int height = (int) ((float) this.getHeight());
int width = (int) ((float) this.getWidth());
int leftOffset = (viewResolution.x - width) / 2;
int topOffset = (viewResolution.y - height) / 2;
getFramingRect().left = leftOffset;
getFramingRect().top = topOffset;
getFramingRect().right = leftOffset + width;
getFramingRect().bottom = topOffset + height;
}
}
盒区扫描。我如何使它更小的方框面积或调整大小?抱歉,我还没有修改的代码,因为我卡住了如何调整它的大小。
我有一个问题,让我的PhoneGap 3.2.0应用程序在Mac上编译,当Zbar条形码扫描器插件实现。如果我部署到该设备,它将在XCode内编译,但如果部署到模拟设备,它会给出错误: ld:警告:忽略文件/users/cordova/myapp/platforms/ios/zbarsdk/libzbar.a,文件/users/cordova/myapp/platforms/ios/zbarsdk
我想用iPhone摄像头测试我的条形码扫描器。 我正在使用ZBar SDK为我的条形码扫描。 有谁能告诉我如何选择一个条形码图像和扫描它使用模拟器吗? 多谢了。
本文向大家介绍iOS中使用ZBar扫描二维码自定义扫描界面功能,包括了iOS中使用ZBar扫描二维码自定义扫描界面功能的使用技巧和注意事项,需要的朋友参考一下 之前在Android中使用过ZXing识别二维码,ZXing也有对应的iOS版本,经过了解,ZBar也是一个常用的二维码识别软件,并分别提供了iOS和Android的SDK可供使用,最终我选择了ZBar进行二维码识别,它的注释清晰,便于使用
我在我的第一个java程序中扫描用户输入时遇到了一些麻烦。当我编译并运行它时,会立即提示输入(即命令行停止并闪烁)。当我输入任何东西时,第一行被打印出来,要求我输入一个整数。然后打印第二行,并提示我输入另一个值。 这个程序的输出是我输入的前两个值。这很难解释,但它基本上要求3个输入值,只使用两个。
我一直在努力在Android上制作我的自定义相机活动,但当旋转相机时,表面视图的纵横比会变得混乱。 在我的oncreate for the activity中,我设置了framelayout,它保存了显示相机参数的曲面视图。 然后,在曲面视图中,我设置要显示的相机参数 您可以看到,当手机旋转时,乐高男会变得更高、更瘦: 如何确保相机视图的纵横比正确?