Android下ZXing豎屏問題的解決。

1、下載下傳源碼

https://github.com/zxing/zxing

2、解壓後建立java工程，導入zxing-core下的源碼，導出jar檔案。

3、導入Android工程，引入2中的jar檔案，将android-core下的CameraConfigurationUtils.java拷貝到對應的位置，編譯OK。

4、修正manifest為豎屏顯示。

<activity android:name=".CaptureActivity"
              android:screenOrientation="portrait"
              android:clearTaskOnLaunch="true"
              android:stateNotNeeded="true"
              android:theme="@style/CaptureTheme"
              android:windowSoftInputMode="stateAlwaysHidden">
           

5、修正 CameraConfigurationUtils.java的findBestPreviewSizeValue（）方法。

因為realWidth和realHeight是從camera的reviewSize中取值，是以總是橫屏。根據螢幕尺寸進行修正。

<pre name="code" class="html" style="font-size: 14px;">// boolean isCandidatePortrait = realWidth < realHeight;
           

boolean isCandidatePortrait = screenResolution.x < screenResolution.y;

           

6、修正 CameraManager.java的getFramingRectInPreview()方法。

cameraResolution儲存了攝像頭傳回的圖檔尺寸，需要進行旋轉對應。
           

if (screenResolution.x < screenResolution.y) {
<span style="white-space:pre">	</span>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;
} else {
	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;
}
           

7、修正DecodeHandler.java的decode()方法。

圖檔向右旋轉90度，并注意修正旋轉後的圖檔寬度和高度。

// <span style="font-family: Monaco;">PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(data, width, height);</span>
           

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];
}
PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(rotatedData, height, width);
           

8、豎屏掃描的問題解決後，可以根據自己的需要定制開發二維碼掃描的庫了。