AppInfoUtil.java

package com.socks.jiandan.utils;

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;

public class AppInfoUtil {

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