blocks|key|1557000|text|要从URL中获取数据，应该在后台进行。有多种方法可以做到这一点，最简单的方法可能是创建一个扩展AsyncTask的类并使用它的doInBackground方法。这是一些有关它的文档。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1557001|https://developer.android.com/reference/android/os/AsyncTask.html|1557002|在这里，您将了解如何使用AsyncTask获取数据。|1557003|http://developer.android.com/training/basics/network-ops/connecting.html|1557004|要解析JSON数据，可以使用JSONObject和JSONArray类。基本上，您必须用JSON字符串作为构造函数的参数实例化一个JSONObject，然后使用它的方法getJSONObject和getJSONArray，使用要获取的数据成员的名称。这里是关于它们的文档和教程。http://developer.android.com/reference/org/json/JSONObject.html+http://developer.android.com/reference/org/json/JSONArray.html+parser.htm|1557005|在JSON字符串被压缩的情况下，为了正确地可视化JSON字符串，我建议您在https://jsonformatter.curiousconcept.com中键入它，然后您可以看到它的良好格式化，以查看JSON是如何组成的。|1557006|要调用google地图，您可以使用隐式意图，下面是一个Android教程，说明如何使用它们来使用主要应用程序，包括谷歌地图。|1557007|http://developer.android.com/guide/components/intents-common.html|1557008|entityMap|0|LINK|mutability|MUTABLE|url|1|2|http://developer.android.com/reference/org/json/JSONObject.html|3|http://developer.android.com/reference/org/json/JSONArray.html|4|http://www.tutorialspoint.com/android/android_json_parser.htm|5|https://jsonformatter.curiousconcept.com/|6^0|1B|9|1R|E|0|0|1T|0|0|C|9|0|0|20|1|0|E|A|P|9|1T|A|2C|D|2Q|C|3V|1R|2|5N|1Q|3|7E|A|4|0|11|14|5|0|0|0|1T|6|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1F|8|@]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|H|3|I|5|6|7|1J|8|@$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1M|8|@]|D|@$9|1N|A|1O|1|1P]]|E|$]]|$1|L|3|M|5|6|7|1Q|8|@$9|1R|A|1S|B|C]|$9|1T|A|1U|B|C]|$9|1V|A|1W|B|C]|$9|1X|A|1Y|B|C]|$9|1Z|A|20|B|C]]|D|@$9|21|A|22|1|23]|$9|24|A|25|1|26]|$9|27|A|28|1|29]]|E|$]]|$1|N|3|O|5|6|7|2A|8|@]|D|@$9|2B|A|2C|1|2D]]|E|$]]|$1|P|3|Q|5|6|7|2E|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|2F|8|@]|D|@$9|2G|A|2H|1|2I]]|E|$]]|$1|T|3|-4|5|6|7|2J|8|@]|D|@]|E|$]]]|U|$V|$5|W|X|Y|E|$Z|G]]|10|$5|W|X|Y|E|$Z|K]]|11|$5|W|X|Y|E|$Z|12]]|13|$5|W|X|Y|E|$Z|14]]|15|$5|W|X|Y|E|$Z|16]]|17|$5|W|X|Y|E|$Z|18]]|19|$5|W|X|Y|E|$Z|S]]]]

To get data from a URL you should do it in the background. There are various ways to do that, the easiest way may be creating a class that extends <code>AsyncTask</code> and using its <code>doInBackground</code> method. Here is some documentation about it.

<a href="https://developer.android.com/reference/android/os/AsyncTask.html" rel="nofollow">https://developer.android.com/reference/android/os/AsyncTask.html</a>

Here you have an explanation of how to fetch data using <code>AsyncTask</code>.

<a href="http://developer.android.com/training/basics/network-ops/connecting.html" rel="nofollow">http://developer.android.com/training/basics/network-ops/connecting.html</a>

To parse JSON data, you can use the <code>JSONObject</code> and <code>JSONArray</code> classes. You basically have to instantiate a <code>JSONObject</code> with the JSON string as the argument of the constructor and then you use its methods <code>getJSONObject</code> and <code>getJSONArray</code> using the name of the data member you want to get. Here are the documentation about them and a tutorial. <a href="http://developer.android.com/reference/org/json/JSONObject.html" rel="nofollow">http://developer.android.com/reference/org/json/JSONObject.html</a>
<a href="http://developer.android.com/reference/org/json/JSONArray.html" rel="nofollow">http://developer.android.com/reference/org/json/JSONArray.html</a>
<a href="http://www.tutorialspoint.com/android/android_json_parser.htm" rel="nofollow">http://www.tutorialspoint.com/android/android_json_parser.htm</a>

In the case the JSON string is compressed, to visualize the JSON string properly I suggest you to type it into <a href="https://jsonformatter.curiousconcept.com" rel="nofollow">https://jsonformatter.curiousconcept.com</a> and then you can see it nicely formatted to see how the JSON is composed.

To call google maps, you use implicit intents, here is an Android tutorial of how to use them to use the main apps including google maps.

<a href="http://developer.android.com/guide/components/intents-common.html" rel="nofollow">http://developer.android.com/guide/components/intents-common.html</a>

blocks|key|5344722|text|使用HttpUrlConnection获取JSON数据，然后使用从服务器获得的JSON+data+(+url+)创建一个新的JSONObject对象，现在只需通过尊重url提供的键从JSONObject获取信息。此时，只需将值传递给GoogleMap对象即可。例如：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5344723|让我们假设url响应这个JSON数据：|5344724|{+
+++"long"+:+25,
+++"lat"+:+6
}|code-block|syntax|javascript|5344725|通过使用HttpURLConnection恢复代码：|5344726|URL+url+=+new+URL("http://localhost_or_any_url/mypage.php");
HttpURLConnection+urlConnection+=+(HttpURLConnection)+url.openConnection();
String+buff+=+"",+data=+"";
InputStream+is+=+urlConnection.getInputStream();
BufferedReader+br+=+new+BufferedReader(new+InputStreamReader(is));
while+((buff+=+br.readLine())+!=+null)+data%2B=+buff;
JSONObject+json=+new+JSONObject(data);
int+long=+json.getInt("long");
int+lat=+json.getInt("lat");|5344727|现在，在两个变量(long，lat)上有您的位置(x，y)+(经度、纬度)，只需将它们传递给您的GoogleMap对象就可以创建如下标记：|5344728|LatLng+myPosition=+new+LatLng(-34,+151);
googleMap.addMarker(new+MarkerOptions().position(myPosition).title("My+position"));
googleMap.moveCamera(CameraUpdateFactory.newLatLng(myPosition));
//the+last+line+(the+call+to+moveCamera+method)+is+optional,+it+helps+to+move+the+camera+to+the+marker+in+case+the+current+map+position+is+far+from+the+marked+position|5344729|这是一个简单的例子，您需要知道从哪里从url获取数据(不能在主线程内部执行网络操作，必须创建一个AsyncTask或Thread)，以及如何将数据传递给保存GoogleMap对象的类。|5344730|祝好运。|5344731|entityMap^0|2|H|18|4|1Q|A|2J|A|38|9|0|0|0|4|H|0|0|1C|9|0|0|1C|9|1M|6|26|9|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1G|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1H|8|@$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|S|3|T|5|J|7|1K|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1L|8|@$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]|$9|1Q|A|1R|B|C]]|D|@]|E|$]]|$1|W|3|X|5|6|7|1S|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1T|8|@]|D|@]|E|$]]]|Z|$]]

use <code>HttpUrlConnection</code> to get the JSON data, and then create a new <code>JSONObject</code> object using the JSON <code>data</code> you got from the server (url), now you have just to get the information from the <code>JSONObject</code> by respecting the keys the url provide. at this point you need just to pass the values to <code>GoogleMap</code> Object. for example:

let's supppose that the url respond with this JSON data: 

<pre><code>{ 
 "long" : 25,
 "lat" : 6
}
</code></pre>

you recover the code by using an <code>HttpURLConnection</code> :

<pre><code>URL url = new URL("http://localhost_or_any_url/mypage.php");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
String buff = "", data= "";
InputStream is = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
while ((buff = br.readLine()) != null) data+= buff;
JSONObject json= new JSONObject(data);
int long= json.getInt("long");
int lat= json.getInt("lat");
</code></pre>

now you have your location (x,y) (longitude, latitude) on the two variables (long, lat), you just have to pass them to your <code>GoogleMap</code> object to create a marker like this :

<pre><code>LatLng myPosition= new LatLng(-34, 151);
googleMap.addMarker(new MarkerOptions().position(myPosition).title("My position"));
googleMap.moveCamera(CameraUpdateFactory.newLatLng(myPosition));
//the last line (the call to moveCamera method) is optional, it helps to move the camera to the marker in case the current map position is far from the marked position
</code></pre>

this is a simple example, you need to be aware to where you get the data from the url (network operations cannot be performed inside the main Thread, you have to create an <code>AsyncTask</code> or a <code>Thread</code>) and how to pass the data to the class that holds the <code>GoogleMap</code> Object.

good luck.

Hello I am new to android and I wanted to know how can I get JSON data from a url and then use that data from the URL to set markers in an android map activity. 

Thanks for the help

How to use JSON data from a url in order to set markers in a map activity android

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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你好，我是android新手，我想知道如何从url中获取JSON数据，然后使用URL中的数据来设置android地图活动中的标记。谢谢你的帮助

问如何使用url中的JSON数据，以便在地图活动android中设置标记
EN

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问如何使用url中的JSON数据，以便在地图活动android中设置标记EN