小编lol*_*lix的帖子

我试图在我的react-native应用程序中打开谷歌地图或地图,但是当我在我的Iphone /模拟器中运行应用程序时,我收到错误"不知道如何打开URI:...".我做错了什么？

我的代码:

openGps() {
  var url = 'geo:37.484847,-122.148386'
  this.openExternalApp(url)
}

openExternalApp(url) {
  Linking.canOpenURL(url).then(supported => {
    if (supported) {
      Linking.openURL(url);
    } else {
      console.log('Don\'t know how to open URI: ' + url);
    }
  });
}

是否可以将AWS Lambda与Apache Kafka集成？我想把一个消费者放在一个lambda函数中.当消费者收到消息时,lambda函数执行.

我想将字符串“example”放在标题中间。

代码：

  <View style={viewStyle}>
      <ImageButton
        imageUrl={require('./assets/icons/Back-25.png')}
        onPress={props.onPressPhone}
      />
        <Text>{props.headerText}</Text>
    </View>

视图样式：

    backgroundColor: 'white',
    alignItems: 'center',
    height: 60,
    paddingTop: 15,
    shadowColor: '#000000',
    shadowOffset: { width: 0, height: 1 },
    shadowOpacity: 0.2,
    elevation: 2,
    position: 'relative',
    flexDirection: 'row',
    justifyContent: 'space-between',

图片按钮样式：

alignSelf: 'center',

array = [
    [ 1, "name1" ],
    [ 2, "name2" ],
    [ 3, "name3" ],
    [ 4, "name4" ]
]

我想把它作为一个像这样的散列数组：

array_hash = [{ "id" => 1, "name" => "name1" },  
              { "id" => 2, "name" => "name2" },  
              { "id" => 3, "name" => "name3" },  
              { "id" => 4, "name" => "name4" }]

我有一个数组数组，我想通过 id 获取最大数量。在下一个示例中，第 2 列代表 id，第 4 列代表值。当 id = 1 时，最大值为 308.45。当 id = 2 时，最大值为 310.508474。

输入：

[['X', '1', '0', '303.016666'],
['X1',  '1', '1', '305.516666'],
['X2',  '1', '2', '308.45'],
['X3',  '2', '0', '309.409836'],
['X4',  '2', '1', '310.508474'],
['X5',  '2', '2', '308.728813']]

输出：

[['X2',  '1', '2', '308.45'],
['X4',  '2', '1', '310.508474']]

我怎样才能做到这一点 ？

我有这个数据帧:

                     value
time
2016-12-01 00:00:00          NaN
2016-12-01 00:01:00          2
2016-12-01 00:02:00          1

我想将此数据帧转换为列表列表,喜欢这样:

[['2016-12-01 00:00:00', NaN],['2016-12-01 00:01:00', 2],['2016-12-01 00:02:00', 1]]

我尝试过df.values或者df.values.tolist()总是收到:

[[ nan]
 [   2]
 [   1]]

我怎样才能转化array1为hash1Ruby的？

array1 看起来像这样:

    [[80, "X", 12],
     [80, "X", 13],
     [80, "X", 14],
     [80, "X", 15],
     [80, "X", 16],
     [81, "Y", 20],
     [81, "Y", 21],
     [81, "Y", 22],
     [81, "Y", 23],
     [81, "Y", 24]]

hash1 看起来像这样:

[['id' => 80, 'type' = >'X', numbers => {12,13,14,15,16}],
       ['id' => 81, 'type' = >'Y',numbers => {20,21,22,23,24}]]