解决android studio设置版本号

/**
* 获取版本号
* @return 当前应用的版本号
*/
public static String getVersion(Context context) {
try {
PackageManager manager = context.getPackageManager();
PackageInfo info = manager.getPackageInfo(context.getPackageName(), 0);
String version = info.versionName;
return version;
} catch (Exception e) {
e.printStackTrace();
return "";
}
}

defaultConfig {
applicationId "com.jackyshan.www.xxx"
minSdkVersion 16
targetSdkVersion 21
versionCode 1
versionName "1.0.1"
}