【发布时间】：2013-04-27 13:38:29
【问题描述】：
我想在Zxing 的相机上显示portrait 方向。
如何做到这一点？
【问题讨论】：
标签： android zxing landscape-portrait
【发布时间】：2013-04-27 13:38:29
【问题描述】：
这是它的工作原理。
第 1 步：在 decode(byte[] data, int width, int height)
中添加以下行以在buildLuminanceSource(..) 之前旋转数据
DecodeHandler.java:
byte[] rotatedData = new byte[data.length];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++)
rotatedData[x * height + height - y - 1] = data[x + y * width];
}
int tmp = width;
width = height;
height = tmp;
PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(rotatedData, width, height);
第二步：修改getFramingRectInPreview()。
CameraManager.java
rect.left = rect.left * cameraResolution.y / screenResolution.x;
rect.right = rect.right * cameraResolution.y / screenResolution.x;
rect.top = rect.top * cameraResolution.x / screenResolution.y;
rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
第 3 步：在 initFromCameraParameters(...) 中禁用横向模式检查
CameraConfigurationManager.java
//remove the following
if (width < height) {
Log.i(TAG, "Display reports portrait orientation; assuming this is incorrect");
int temp = width;
width = height;
height = temp;
}
第 4 步：添加以下行以在setDesiredCameraParameters(...) 中旋转相机
CameraConfigurationManager.java
camera.setDisplayOrientation(90);
第 5 步：不要忘记将活动方向设置为纵向。即：清单
【讨论】：
-
这个不错！尽管您要从仅支持横向变为仅支持纵向，而不是两者兼而有之。这也不适用于前置摄像头或倒置的纵向。
-
此异常显示致命异常：线程 9 java.lang.IllegalArgumentException：裁剪矩形不适合图像数据。 : 在 com.google.zxing.client.android.PlanarYUVLuminanceSource.
(PlanarYUVLuminanceSource.java:46) : 在 com.google.zxing.client.android.camera.CameraManager.buildLuminanceSource(CameraManager.java:275) 在 com .google.zxing.client.android.DecodeHandler.decode(DecodeHandler.java:80) E/AndroidRuntime(5523): at com.google.zxing.client.android.DecodeHandler.handleMessage(DecodeHandler.java:54) -
@Roylee ，嘿 thnks ，它正在工作，我想问一下，它可以根据传感器在风景和肖像中都工作吗，如果你可以请帮忙
-
是的，我跟着他们去了，但它永远不会扫描我：S 虽然我找到了解决方案。不要转哈哈！我将它用于二维码，所以它可以双向工作，所以我只需从视图中删除任何文本并保留它！不过谢谢你的关心。
-
对我有用，虽然相机图像有点超出纵横比（qrcode，nexus4）
要支持所有方向并在旋转 Activity 时自动更改，只需修改 CameraManager.java类。
并从 CaptureActivity.java
中删除此方法 getCurrentOrientation()在 CameraManager.java 中创建这个变量：
int resultOrientation;
将此添加到 openDriver(..) 方法中：
setCameraDisplayOrientation(context, Camera.CameraInfo.CAMERA_FACING_BACK, theCamera);//this can be set after camera.setPreviewDisplay(); in api13+.
****创建此方法**** 链接：http://developer.android.com/reference/android/hardware/Camera.html
public static void setCameraDisplayOrientation(Context context,int cameraId, android.hardware.Camera camera) {
android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(cameraId, info);
Display display = ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int degrees = 0;
switch (display.getRotation()) {
case Surface.ROTATION_0: degrees = 0; break;
case Surface.ROTATION_90: degrees = 90; break;
case Surface.ROTATION_180: degrees = 180; break;
case Surface.ROTATION_270: degrees = 270; break;
}
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
resultOrientation = (info.orientation + degrees) % 360;
resultOrientation = (360 - resultOrientation) % 360; // compensate the mirror
} else { // back-facing
resultOrientation = (info.orientation - degrees + 360) % 360;
}
camera.setDisplayOrientation(resultOrientation);
}
****现在修改getFramingRectInPreview()****
if(resultOrientation == 180 || resultOrientation == 0){//to work with landScape and reverse landScape
rect.left = rect.left * cameraResolution.x / screenResolution.x;
rect.right = rect.right * cameraResolution.x / screenResolution.x;
rect.top = rect.top * cameraResolution.y / screenResolution.y;
rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;
}else{
rect.left = rect.left * cameraResolution.y / screenResolution.x;
rect.right = rect.right * cameraResolution.y / screenResolution.x;
rect.top = rect.top * cameraResolution.x / screenResolution.y;
rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
}
并修改此方法public PlanarYUVLuminanceSource buildLuminanceSource(..)
if(resultOrientation == 180 || resultOrientation == 0){//TODO: This is to use camera in landScape mode
// Go ahead and assume it's YUV rather than die.
return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height(), false);
}else{
byte[] rotatedData = new byte[data.length];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++)
rotatedData[x * height + height - y - 1] = data[x + y * width];
}
int tmp = width;
width = height;
height = tmp;
return new PlanarYUVLuminanceSource(rotatedData, width, height, rect.left, rect.top, rect.width(), rect.height(), false);
}
【讨论】：
-
它打破了某些设备上预览的缩放比例
-
@mustafa 我相信这就是他们在自己的库版本中不支持轮换的原因。
你可以使用我的 zxlib 的 fork https://github.com/rusfearuth/zxing-lib-without-landscape-only。我只禁用了横向模式。您可以设置横向/纵向并查看正确的相机视图。
【讨论】：
在CameraConfigurationManager.java 中添加camera.setDisplayOrientation(90); 对我有用。
【讨论】：
-
在哪里进行此更改？
-
我想我们需要编辑zxing的源代码，我对@Samit吗？
对于 zxing 3.0，工作库 https://github.com/xiaowei4895/zxing-android-portrait 纵向模式
谢谢
【讨论】：
我认为最好的库唯一解决方案是这个......
https://github.com/SudarAbisheck/ZXing-Orient
您可以将它作为 maven 格式的项目的依赖项包含在 build.gradle 中...
dependencies {
compile ''me.sudar:zxing-orient:2.1.1@aar''
}
【讨论】：
-
这个库不工作。 Jsut 不扫描，我得到的只是
QRCodeNotFoundOnCamImage -
@Siddharth 谢谢，是的，我已经为另一个运行良好的库编辑了答案，实际上与 ZXing BarcodeScanner 和 BarcodeScannerPlus 应用程序的方式相同。
创建 AnyOrientationCaptureActivity 然后覆盖默认的 CaptureActivity 就可以了。
public void scanCode() {
IntentIntegrator integrator = new IntentIntegrator(this);
integrator.setDesiredBarcodeFormats(CommonUtil.POSEIDON_CODE_TYPES);
integrator.setPrompt("Scan");
integrator.setCameraId(0);
integrator.setBeepEnabled(false);
integrator.setBarcodeImageEnabled(false);
integrator.setOrientationLocked(false);
//Override here
integrator.setCaptureActivity(AnyOrientationCaptureActivity.class);
integrator.initiateScan();
}
//create AnyOrientationCaptureActivity extend CaptureActivity
public class AnyOrientationCaptureActivity extends CaptureActivity {
}
在清单中定义
<activity
android:name=".views.AnyOrientationCaptureActivity"
android:screenOrientation="fullSensor"
android:stateNotNeeded="true"
android:theme="@style/zxing_CaptureTheme"
android:windowSoftInputMode="stateAlwaysHidden"></activity>
【讨论】：
-
captureactivity 是正常扩展活动的替代品？
【讨论】：
除了@roylee 的修改之外，我还必须将以下内容应用于CameraConfigurationManager.java 以获得最佳的预览和二维码识别质量
diff --git a/android/src/com/google/zxing/client/android/camera/CameraConfigurationManager.java b/android/src/com/google/zxing/client/android/camera/CameraConfigurationManager.java
index cd9d0d8..4f12c8c 100644
--- a/android/src/com/google/zxing/client/android/camera/CameraConfigurationManager.java
+++ b/android/src/com/google/zxing/client/android/camera/CameraConfigurationManager.java
@@ -56,21 +56,24 @@ public final class CameraConfigurationManager {
Display display = manager.getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
- // We're landscape-only, and have apparently seen issues with display thinking it's portrait
+ // We're landscape-only, and have apparently seen issues with display thinking it's portrait
// when waking from sleep. If it's not landscape, assume it's mistaken and reverse them:
+ /*
if (width < height) {
Log.i(TAG, "Display reports portrait orientation; assuming this is incorrect");
int temp = width;
width = height;
height = temp;
}
+ */
screenResolution = new Point(width, height);
Log.i(TAG, "Screen resolution: " + screenResolution);
- cameraResolution = findBestPreviewSizeValue(parameters, screenResolution, false);
+ cameraResolution = findBestPreviewSizeValue(parameters, screenResolution, true);//
Log.i(TAG, "Camera resolution: " + cameraResolution);
}
void setDesiredCameraParameters(Camera camera) {
+ camera.setDisplayOrientation(90);
Camera.Parameters parameters = camera.getParameters();
if (parameters == null) {
@@ -99,7 +102,7 @@ public final class CameraConfigurationManager {
Point getScreenResolution() {
return screenResolution;
}
-
+
public void setFrontCamera(boolean newSetting) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
boolean currentSetting = prefs.getBoolean(PreferencesActivity.KEY_FRONT_CAMERA, false);
@@ -109,12 +112,12 @@ public final class CameraConfigurationManager {
editor.commit();
}
}
-
+
public boolean getFrontCamera() {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
return prefs.getBoolean(PreferencesActivity.KEY_FRONT_CAMERA, false);
}
-
+
public boolean getTorch() {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
return prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false);
@@ -181,7 +184,14 @@ public final class CameraConfigurationManager {
Camera.Size defaultSize = parameters.getPreviewSize();
bestSize = new Point(defaultSize.width, defaultSize.height);
}
+
+ // FIXME: test the bestSize == null case!
+ // swap width and height in portrait case back again
+ if (portrait) {
+ bestSize = new Point(bestSize.y, bestSize.x);
+ }
return bestSize;
+
}
private static String findSettableValue(Collection<String> supportedValues,
【讨论】：