android应用/游戏上架国内渠道，国外GooglePlay接入的登录或者支付验证需要验证包名，versionCode，签名等应用信息，为了快速检查应用信息以工具化获取应用信息。

tips：在Activity下直接用getPackageManager可获取PackageManager实例

1、应用名：getPackageManager().getApplicationInfo(packName,0).loadLabel(getPackageManager());返回CharSequence
2、应用Icon：getPackageManager().getApplicationInfo(packName,0).loadIcon(getPackageManager());返回drawable
3、VersionCode：getPackageManager().getPackageInfo(packName,0).versionCode
4、VersionName：getPackageManager().getPackageInfo(packName,0).versionName
5、targetSdkVersion：getPackageManager().getPackageInfo(packName,0).applicationInfo.targetSdkVersion
6、minSDKVersion：getPackageManager().getPackageInfo(packName,0).applicationInfo.minSdkVersion
7、启动项：getPackageManager().getLaunchIntentForPackage(packName)返回Intent,可用于跳转
获取启动项类名：getPackageManager().getLaunchIntentForPackage(packName).getComponent().getClassName()
8、权限：getPackageManager().getPackageInfo(packName,PackageManager.GET_PERMISSIONS).requestedPermissions返回类型为字符串数组
9、activity组件：getPackageManager().getPackageInfo(packName, PackageManager.GET_ACTIVITIES).activities返回ActivityInfo数据类

PackageInfo packageInfo = getPackageManager().getPackageInfo(packName, PackageManager.GET_ACTIVITIES)  
for (ActivityInfo activityInfo : packageInfo.activities){
//获取activity名称
Log.d(TAG,activityInfo.name+"\n");
 }

10、service组件：getPackageManager().getPackageInfo(packName, PackageManager.GET_SERVICES).services返回ServiceInfo数据类

PackageInfo packageInfo = getPackageManager().getPackageInfo(packName, PackageManager.GET_SERVICES)  
for (ServiceInfo serviceInfo : packageInfo.services){
//获取service名称
Log.d(TAG,serviceInfo.name+"\n");
 }

11、provider组件：getPackageManager().getPackageInfo(packName, PackageManager.GET_PROVIDERS).providers返回ProviderInfo数据类

PackageInfo packageInfo = getPackageManager().getPackageInfo(packName, PackageManager.GET_PROVIDERS)  
for (ProviderInfo providerInfo : packageInfo.providers){
//获取provider名称
Log.d(TAG,activityInfo.name+"\n");
 }

12、获取keyhash：

 /**获取Keyhash*/
    public static String getKeyhash(Activity activity, String packName){
        String KeyHash = "";
        try {
            int i = 0;
            PackageInfo info = activity.getPackageManager().getPackageInfo( packName,  PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                i++;
                MessageDigest md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                KeyHash = Base64.encodeToString(md.digest(), Base64.DEFAULT);
                //KeyHash 
                Log.e(tag, "KeyHash: " + KeyHash);
            }
        }
        catch (Exception e) {
            Log.e(tag,"获取keyhash失败"+e.getMessage());
            KeyHash = "";
        }
        return KeyHash;
    }

13、获取签名MD5，SHA1，SHA256：

/**获取SHA1
     * @param activity 当前activity
     * @param packName 包名
     * @param type 获取数据类型：MD5,SHA1,SHA256
     * */
    public static String getSignatures(Activity activity, String packName, String type){
        String sha1 = "";
        PackageInfo info = null;
        try {
            info = activity.getPackageManager().getPackageInfo(packName, PackageManager.GET_SIGNATURES);

            byte[] cert = info.signatures[0].toByteArray();
            //type:MD5,SHA1,SHA256
            MessageDigest md = MessageDigest.getInstance(type);

            byte[] publicKey = md.digest(cert);
            StringBuffer hexString = new StringBuffer();
            for (int i = 0; i < publicKey.length; i++) {
                String appendString = Integer.toHexString(0xFF & publicKey[i])
                        .toUpperCase(Locale.US);
                if (appendString.length() == 1){
                    hexString.append("0");
                }
                hexString.append(appendString);
                hexString.append(":");
            }
            String result = hexString.toString();
            Log.d(tag,"SHA1:"+result.substring(0, result.length()-1));
            return result.substring(0, result.length()-1);

        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

14、获取META_DATA标签指定key的value

    /**获取节点value*/
    public static String getMeta(Activity activity, String packName, String key){
        ApplicationInfo applicationInfo = null;
        String value = "";
        try {
            applicationInfo = activity.getPackageManager().getApplicationInfo(packName,PackageManager.GET_META_DATA);
            value = String.valueOf(applicationInfo.metaData.get(key));
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }catch (NullPointerException e){
            e.printStackTrace();
        }
        return value;
    }