Tencent/matrix错误：Cause: need sign apk but apksigner *\Sdk/build-tools/28.0.2/apksigner was not exist!
Tencent/matrix的演示例子中编译都通过，但是安装失败，失败提示消息：
Cause: need sign apk but apksigner *\Sdk/build-tools/28.0.2/apksigner was not exist!
意思是找不到apksigner文件，看了我自己的28.0.2包里面，有apksigner文件，但是该文件是apksigner.bat
在app的build.gradle文件里面把：
apksignerPath = "${android.getSdkDirectory().getAbsolutePath()}/build-tools/${android.getBuildToolsVersion()}/apksigner"修改补全apksigner为apksigner.bat即可：
apksignerPath = "${android.getSdkDirectory().getAbsolutePath()}/build-tools/${android.getBuildToolsVersion()}/apksigner.bat"
