最近老是用到关于程序包名，图标问题，现总结如下：

PackageInfo info;    
        try {    
            info = this.getPackageManager().getPackageInfo(this.getPackageName(), 0);    
            // 当前应用的版本名称    
            String versionName = info.versionName;    
            // 当前版本的版本号    
            int versionCode = info.versionCode;    
            // 当前版本的包名    
            String packageNames = info.packageName;    
        } catch (NameNotFoundException e) {    
            e.printStackTrace();    
        }    

定义一个 Info 类来获取

public class Info {    
    Context context ;    
    PackageManager pm ;    
    public Info(Context context) {    
        this.context = context;    
        pm = context.getPackageManager();    
    }    
    /*  
     * 获取程序 图标  
     */    
    public Drawable getAppIcon(String packname){    
      try {    
             ApplicationInfo info = pm.getApplicationInfo(packname, 0);     
             return info.loadIcon(pm);    
        } catch (NameNotFoundException e) {    
            // TODO Auto-generated catch block    
            e.printStackTrace();    
              
        }    
    }    
        
    /*  
     *获取程序的版本号    
     */    
    public String getAppVersion(String packname){    
            
          try {    
              PackageInfo packinfo = pm.getPackageInfo(packname, 0);    
              return packinfo.versionName;    
            } catch (NameNotFoundException e) {    
                e.printStackTrace();    
                   
            }    
    }    
        
    
    /*  
     * 获取程序的名字   
     */    
    public String getAppName(String packname){    
          try {    
                 ApplicationInfo info = pm.getApplicationInfo(packname, 0);     
                 return info.loadLabel(pm).toString();    
            } catch (NameNotFoundException e) {    
                // TODO Auto-generated catch block    
                e.printStackTrace();    
                 
            }    
    }    
    /*  
     * 获取程序的权限  
     */    
    public String[] getAppPremission(String packname){    
          try {    
              PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_PERMISSIONS);    
              //获取到所有的权限     
              return packinfo.requestedPermissions;    
    
            } catch (NameNotFoundException e) {    
                e.printStackTrace();    
                   
            }    
    }    
        
        
    /*  
     * 获取程序的签名   
     */    
    public String getAppSignature(String packname){    
          try {    
              PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_SIGNATURES);    
              //获取到所有的权限     
              return packinfo.signatures[0].toCharsString();    
    
            } catch (NameNotFoundException e) {    
                e.printStackTrace();    
                  
            }    
    }