公共代码参考（PackageManager）

package com.fredric.util;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

/*-
 * APP辅助类
 */

public class AppUtils {

    //获取APP的名称
    public static String getAppName(Context context){

        try {
            PackageManager packageManager = context.getPackageManager();
            PackageInfo packetinfo
                = packageManager.getPackageInfo(context.getPackageName(), 0);
            //PackageInfo 对应整个Packet
            //ApplicationInfo主要是AndroidManifest.xml 文件中<Application/>标签对应的相应信息的封装
            //下例为：android:label="@string/app_name"
            int labelRes = packetinfo.applicationInfo.labelRes;
            return context.getResources().getString(labelRes);

        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }

        return null;
    }

    //获取版本名
    public static String getAppVersion(Context context){
        try {
            PackageManager packageManager = context.getPackageManager();
            PackageInfo packetinfo
                = packageManager.getPackageInfo(context.getPackageName(), 0);
            return packetinfo.versionName;
        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

}