获取应用的当前版本号

public static String getCurrentVersionName(Context context) {
String version = null;
try {
// 获取packagemanager的实例
PackageManager packageManager = context.getPackageManager();
// getPackageName()是你当前类的包名，0代表是获取版本信息
PackageInfo packInfo = packageManager.getPackageInfo(context.getPackageName(), 0);
version = packInfo.versionName;
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
return version;
}