Android根据包名获取程序基本信息

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();  
                
            }  
    }