1：導入android studio project 時總會出現運行處一個紅色叉號，這里可以點擊選擇叉號上面顯示的Edit Configurations 查看右下角的錯誤警告信息。:
2：記錄錯誤:
the apk for your currently selected variant(app-release-unsigned.apk)is not signed.Please specity a signing configuration for this variant(release)
3：解決方法：android studio左下角打開Build Variants，將release換為debug即可。