工具类—如何快速获得Android应用的版本号

/**
* 获取apk的版本号 currentVersionCode
*/
public static int getAPPVersionCodeFromAPP(Context ctx) {
int currentVersionCode = 0;
PackageManager manager = ctx.getPackageManager();
try {
PackageInfo info = manager.getPackageInfo(ctx.getPackageName(), 0);
String appVersionName = info.versionName; // 版本名
currentVersionCode = info.versionCode; // 版本号
System.out.println(currentVersionCode + " " + appVersionName);
} catch (NameNotFoundException e) {
// TODO Auto-generated catch blockd
e.printStackTrace();
}
return currentVersionCode;
}