设置apk不覆盖安装，只需要修改build.gradle中的applicationId即可，
但是在安装7.0以上版本时，
需要把AndroidManifest.xml文件中关于7.0的私有目录配置中的路径修改成和applicationId一样
<providerandroid:name="android.support.v4.content.FileProvider"android:authorities="${APP_APPLICATION_FILEPROVIDER}"android:exported="false"android:grantUriPermissions="true"><meta-dataandroid:name="android.support.FILE_PROVIDER_PATHS"android:resource="@xml/file_paths" /></provider>
defaultConfig {applicationId APP_APPLICATION_PACKAGE_PATHminSdkVersion 19targetSdkVersion 28versionCode 1.0versionName "1.0"//AndroidManifest 占位符manifestPlaceholders = [APP_APPLICATION_FILEPROVIDER: APP_APPLICATION_FILEPROVIDER]}buildTypes {//BuildConfig常量参数release {buildConfigField "String", "APP_APPLICATION_FILEPROVIDER", "\"" + APP_APPLICATION_FILEPROVIDER + "\""}debug {buildConfigField "String", "APP_APPLICATION_FILEPROVIDER", "\"" + APP_APPLICATION_FILEPROVIDER + "\""}}
/*** 7.0私有目录访问权限*/public static final String fileprovider_path = BuildConfig.APP_APPLICATION_FILEPROVIDER;
然后在gradle.properties中设置两个常量参数，就可以全局调用了，
