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Android Lists and Adapters

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From JSONArray to Java Array

4:35 with Ken Alger

Let's look at how to convert our data from JSONArray to be used in a Java Array.

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    Welcome back, how did you do? 0:00
    Hopefully this is just review for you. 0:02
    We start off here creating a new array of hour objects. 0:05
    So Hour array. 0:12
    We'll call it hours, so new_Hour array, 0:15
    Data.length. 0:22
    We can then loop through all the items in the JSON array, 0:28
    get the data we want from each one, and set a new Hour object in the hours array. 0:31
    I'll do it in a for loop. 0:37
    Scroll up here a little bit, give ourselves some room. 0:40
    So for. 0:45
    So as long as i is less than the length of our data. 0:51
    Our incrementor. 0:57
    One thing to note here is that length is a method, not a property. 1:00
    With a normal array, like our array of hours, 1:06
    we get the length via a property called length, not a method. 1:10
    It's easy to confuse the two, but that's why we have auto-complete. 1:15
    Back to our loop. 1:20
    Our first step is to create a new JSON object for the item at position i. 1:21
    So JSONObject, we'll call it 1:26
    jsonHour, we want data, 1:31
    getJSONObject at position i. 1:35
    Now we create an hour object, 1:42
    And set our values from the JSON. 1:50
    So setSummary(jsonHour). 1:54
    GetString, and it was called summary. 2:01
    We'll set our icon. 2:08
    Again, that was a string. 2:14
    We'll set our temperature, which is a double. 2:21
    Called temperature. 2:32
    We'll set our time, Which was a long, 2:35
    Called "time". 2:47
    And we'll set our timezone. 2:50
    We'll pass in timezone. 2:55
    And now we can return hours. 3:05
    All right, let's verify this is working by using the debugger. 3:11
    We can set a break point here where we're defining hour. 3:15
    Set a break point, and we run our app with the debugger. 3:19
    There's our hour. 3:44
    And we see it starts populating. 3:49
    Very nice. 3:52
    And our data is coming through. 3:52
    Terrific, let's not forget to remove this break point before we move on. 3:54
    Fantastic work. 4:05
    We've updated our data model to handle this more complex set of data, and 4:07
    then we saw how to use the JSON array class to work with arrays of JSON objects. 4:11
    With this skill set, you are pretty much a master of working with JSON in Android. 4:16
    It can get a little tedious though. 4:21
    In true Android and open source fashion, there are some excellent 4:23
    third party libraries available that make working with json data even easier. 4:27
    If you're interested, check out the links in the teacher's notes. 4:32

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