android 获取本机其他app的版本信息的示例代码

package com.zznode.bean;

import android.graphics.drawable.Drawable;
import android.util.Log;

/**
 * Created by 杰梵 on 2017/9/25.
 * 用来存取app的信息。
 */

public class AppInfo {
  public String appName = "";
  public String packageName = "";
  public String versionName = "";
  public int versionCode = 0;
  public Drawable appIcon = null;

  public void print(){
    Log.v("app","Name:"+appName+" Package:"+packageName);
    Log.v("app","Name:"+appName+" versionName:"+versionName);
    Log.v("app","Name:"+appName+" versionCode:"+versionCode);
  }

}

/**
   *
   * @param sign 1、本机全部app的信息 2、系统应用的信息 3、非系统应用的信息
   * @return app的信息
   */
  public List<AppInfo> getAppInfo(int sign) {
    List<AppInfo> appList = new ArrayList<AppInfo>(); //用来存储获取的应用信息数据　　　　　
    List<PackageInfo> packages = getPackageManager().getInstalledPackages(0);
    for (int i = 0; i < packages.size(); i++) {
      PackageInfo packageInfo = packages.get(i);
      AppInfo tmpInfo = new AppInfo();
      tmpInfo.appName = packageInfo.applicationInfo.loadLabel(getPackageManager()).toString();
      tmpInfo.packageName = packageInfo.packageName;
      tmpInfo.versionName = packageInfo.versionName;
      tmpInfo.versionCode = packageInfo.versionCode;
      tmpInfo.appIcon = packageInfo.applicationInfo.loadIcon(getPackageManager());
      if (sign == 1) {//全手机全部应用
        appList.add(tmpInfo);
      } else if (sign == 2) {
        if ((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
          appList.add(tmpInfo);//如果非系统应用，则添加至appList
        }
      } else if (sign == 3) {
        if ((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
          appList.add(tmpInfo);//如果非系统应用，则添加至appList
        }
      }
    }
    return appList;
  }