uniapp 应用未安装：软件包与现有软件包存在冲突
应用未安装：软件包与现有软件包存在冲突
常见原因
包名（AppID）没变，但签名证书不同
安卓会把同一包名的 App 当成同一个应用。
如果你之前安装的版本用了 A 签名，现在你打包用了 B 签名，就会冲突，导致不能直接覆盖安装。
包名相同，版本号过低
比如旧应用是
1.0.5，你新打的包是1.0.0，安卓会认为不能降级安装。
多渠道包 / 不同编译模式冲突
有些情况下，调试包（debug）和发布包（release）共用包名但签名不同，也会冲突。
解决方法：
主要是包名不一致。要么改一个新的包名，要么就是卸载安装APP。
manifest.json
"app-plus": {"distribute": {"android": {"package": "com.yourcompany.mes"}}
}
全部配置：
{// "name" : "mes",//正式"name" : "mes测试版","appid" : "__UNI__8A5EEB8","description" : "","versionName" : "2.6.2","versionCode" : 7,"transformPx" : false,"sassImplementationName" : "node-sass",/* 5+App特有相关 */"app-plus" : {"compatible" : {"ignoreVersion" : true //true表示忽略版本检查提示框，HBuilderX1.9.0及以上版本支持 },"permissions" : {"camera" : true},"usingComponents" : true,"nvueStyleCompiler" : "uni-app","compilerVersion" : 3,"splashscreen" : {"alwaysShowBeforeRender" : true,"waiting" : true,"autoclose" : true,"delay" : 0},/* 模块配置 */"modules" : {"Camera" : {},"Barcode" : {}},/* 应用发布信息 */"distribute" : {/* android打包配置 */"android" : {"permissions" : ["<uses-permission android:name=\"android.permission.CHANGE_NETWORK_STATE\"/>","<uses-permission android:name=\"android.permission.MOUNT_UNMOUNT_FILESYSTEMS\"/>","<uses-permission android:name=\"android.permission.VIBRATE\"/>","<uses-permission android:name=\"android.permission.READ_LOGS\"/>","<uses-permission android:name=\"android.permission.ACCESS_WIFI_STATE\"/>","<uses-feature android:name=\"android.hardware.camera.autofocus\"/>","<uses-permission android:name=\"android.permission.ACCESS_NETWORK_STATE\"/>","<uses-permission android:name=\"android.permission.CAMERA\"/>","<uses-permission android:name=\"android.permission.GET_ACCOUNTS\"/>","<uses-permission android:name=\"android.permission.READ_PHONE_STATE\"/>","<uses-permission android:name=\"android.permission.CHANGE_WIFI_STATE\"/>","<uses-permission android:name=\"android.permission.WAKE_LOCK\"/>","<uses-permission android:name=\"android.permission.FLASHLIGHT\"/>","<uses-feature android:name=\"android.hardware.camera\"/>","<uses-permission android:name=\"android.permission.WRITE_SETTINGS\"/>"],"abiFilters" : [ "armeabi-v7a", "arm64-v8a" ],"minSdkVersion" : 21,// "package": "com.keyang.mes",//正式"package": "com.keyang.mes.meta"//测试包名},/* ios打包配置 */"ios" : {"dSYMs" : false},/* SDK配置 */"sdkConfigs" : {"ad" : {}},"icons" : {"android" : {"hdpi" : "unpackage/res/icons/72x72.png","xhdpi" : "unpackage/res/icons/96x96.png","xxhdpi" : "unpackage/res/icons/144x144.png","xxxhdpi" : "unpackage/res/icons/192x192.png"},"ios" : {"appstore" : "unpackage/res/icons/1024x1024.png","ipad" : {"app" : "unpackage/res/icons/76x76.png","app@2x" : "unpackage/res/icons/152x152.png","notification" : "unpackage/res/icons/20x20.png","notification@2x" : "unpackage/res/icons/40x40.png","proapp@2x" : "unpackage/res/icons/167x167.png","settings" : "unpackage/res/icons/29x29.png","settings@2x" : "unpackage/res/icons/58x58.png","spotlight" : "unpackage/res/icons/40x40.png","spotlight@2x" : "unpackage/res/icons/80x80.png"},"iphone" : {"app@2x" : "unpackage/res/icons/120x120.png","app@3x" : "unpackage/res/icons/180x180.png","notification@2x" : "unpackage/res/icons/40x40.png","notification@3x" : "unpackage/res/icons/60x60.png","settings@2x" : "unpackage/res/icons/58x58.png","settings@3x" : "unpackage/res/icons/87x87.png","spotlight@2x" : "unpackage/res/icons/80x80.png","spotlight@3x" : "unpackage/res/icons/120x120.png"}}},"splashscreen" : {"androidStyle" : "common"}},"nvueLaunchMode" : ""},/* 快应用特有相关 */"quickapp" : {},/* 小程序特有相关 */"mp-weixin" : {"appid" : "qqqq132123","setting" : {"urlCheck" : false},"usingComponents" : true},"mp-alipay" : {"usingComponents" : true},"mp-baidu" : {"usingComponents" : true},"mp-toutiao" : {"usingComponents" : true},"uniStatistics" : {"enable" : false},// 192.168.10.25:512 _default// 192.168.180.30:82"h5" : {"devServer" : {"port" : 8000,"disableHostCheck" : true,"proxy" : {"/api" : {"target" : "http://10.70.119.35:5001",// "target" : "http://localhost:5001",// "target" : "http://192.168.1.4:5001","changeOrigin" : true,"secure" : false,"logLevel" : "debug","pathRewrite" : {"^/api" : ""}},"/pda" : {"target" : "http://10.70.119.35:82",// "target" : "http://localhost:82",// "target" : "http://192.168.1.4:82","changeOrigin" : true,"secure" : false,"logLevel" : "debug","pathRewrite" : {"^/pda" : ""}}}}},"locale" : "auto"
}