Android 获取包名，版本信息及VersionName名称

<span style="font-size: 14px;">private String getAppInfo() {  
        try {  
            String pkName = this.getPackageName();  
            String versionName = this.getPackageManager().getPackageInfo(  
                    pkName, 0).versionName;  
            int versionCode = this.getPackageManager()  
                    .getPackageInfo(pkName, 0).versionCode;  
            return pkName + "   " + versionName + "  " + versionCode;  
        } catch (Exception e) {  
        }  
        return null;  
    }</span>