How to Parse Nested JSON Data with GSON in Android?

Parsing JSON Data with GSON in Android

Question:

How to parse JSON data using GSON in Android?

Problem:

<code class="json">{
    "count": "12",
    "colbreak": 1,
    "name": "unary rels",
    "score": "9090",
    "Words": [
        {
            "count": 6,
            "word": "prp_għaċ-",
            "name": "prp_għaċ-",
            "score": 9.1,
            "Words": "kol",
            "seek": 2231297
        }
    ],
    "seek": 0
}</code>

The following code is not parsing the JSON data correctly, resulting in a "JsonSyntaxException":

<code class="java">public static <T> ArrayList<T> JsonParse(T t, String response) {
    // ...

    reader.beginObject();
    while (reader.hasNext()) {
        T cse = (T) gson.fromJson(reader, t.getClass());
        lcs.add(cse);
    }

    reader.endObject();

    // ...
}</code>

Answer:

To correctly parse the JSON data, follow these steps:

1. Read the JSON Value:

<code class="java">try {
    AssetManager assetManager = getAssets();
    InputStream ims = assetManager.open("file.txt");

    Gson gson = new Gson();
    Reader reader = new InputStreamReader(ims);

    GsonParse gsonObj = gson.fromJson(reader, GsonParse.class);

} catch(IOException e) {
    e.printStackTrace();
}</code>

2. Define the Data Classes:

<code class="java">public class GsonParse {
    @SerializedName("count")
    private String count;

    // ...

    public String getCount() {
        return count;
    }

    public void setCount(String count) {
        this.count = count;
    }

    // ...
}

public class Words {
    @SerializedName("count")
    private String count;

    // ...

    public String getCount() {
        return count;
    }

    public void setCount(String count) {
        this.count = count;
    }

    // ...
}</code>

Additional Notes:

• Make sure UTF-8 encoding is used when transmitting JSON data over HTTP.
• Convert any incoming JSON data to UTF-8 format if necessary.
• Ensure that you have included the parameters in the nested "Words" class.

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