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;
}

}