Zxing 豎屏切換 Android
在google上下載的ZxingDemo 為橫屏狀態
我簡單的在Androidmanifest.xml把Activity換成豎屏android:screenOrientation="portrait"
屏幕雖然正了 但是屏幕上顯示的拍攝畫面還是橫著的
查了一些網上的資料 結合自己手工調試
在這裡總結分享一下
步驟:
1) 在AndroidManifest.xml中把 <Activity />標簽 CaptureActivity 的screenOrientation修改為
android:screenOrientation="portrait"
2) 在CameraManager.java類中的getFramingRectInPreview()替換掉原先的 left right top bottom
//豎屏
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;
3) 在CameraConfigurationManager.java中void setDesiredCameraParameters(Camera camera)方法
在setParameters之前增加
camera.setDisplayOrientation(90);
4) 在DecodeHandler.java中的 decode(byte[] data, int width, int height)方法在
PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height);
之前添加:
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; // Here we are swapping, that's the difference to #11
width = height;
height = tmp;
data = rotatedData;
5) 將CameraConfigurationManager的 initFromCameraParameters(Camera camera)方法整個替換如下
該方法防止豎屏後屏幕拉伸
/**
* Reads, one time, values from the camera that are needed by the app.
*/
void initFromCameraParameters(Camera camera) {
Camera.Parameters parameters = camera.getParameters();
previewFormat = parameters.getPreviewFormat();
previewFormatString = parameters.get("preview-format");
Log.d(TAG, "Default preview format: " + previewFormat + '/'
+ previewFormatString);
WindowManager manager = (WindowManager) context
.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
screenResolution = new Point(display.getWidth(), display.getHeight());
Log.d(TAG, "Screen resolution: " + screenResolution);
Point screenResolutionForCamera = new Point();
screenResolutionForCamera.x = screenResolution.x;
screenResolutionForCamera.y = screenResolution.y;
// preview size is always something like 480*320, other 320*480
if (screenResolution.x < screenResolution.y) {
screenResolutionForCamera.x = screenResolution.y;
screenResolutionForCamera.y = screenResolution.x;
}
cameraResolution = getCameraResolution(parameters, screenResolutionForCamera);
// cameraResolution = getCameraResolution(parameters, screenResolution);
Log.d(TAG, "Camera resolution: " + screenResolution);
}
至此Zxing 橫屏就切換為豎屏
不足之處請在下方留言 謝謝
希望對您有用
資源下載地址見 http://www.linuxidc.com/Linux/2014-05/101115.htm
更多Android相關信息見Android 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=11
