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集成到项目里,首次可以正常预览LPRActivity,再次进入预览界面LPRActivity后app崩溃, 在ScannerView里的方法getPreviewRatio 中代码mPreviewView.getDisplay().getRealMetrics(metrics); getDisplay()为null,这是初始化流程问题吗?需要完全退出app后,再次进入才可以预览,望赐教,谢谢