JSON 2

android框架已经为我们集成了解析json的包 


先一个简单的例子，json直接写在string中 

String staticObject = "{\"firstname\":\"Steve\",\"lastname\":\"Jobs\",\"cellphones\":\"0\"}";

void buildObject()
{
    try
    {
        obj = new JSONObject(staticObject);
        String x = obj.get("firstname").toString() + " " + obj.get("lastname").toString() + " has " + obj.getInt("cellphones") + " Android phones.";
        setStatus(x);
    }
    catch (JSONException je)
    {
        setStatus("Error occured " + je.getMessage());
    }
}

void setStatus(String x)
{
    TextView tv = (TextView) findViewById(R.id.txtStatus);
    tv.setText(x);
}

将json写在文件中，并放在raw目录下 
json形式为 

{
"firstname":"Richard",
"lastname":"Stearns",
"almamater":"Cornell University",
"occupation":"President, World Vision",
"interview":
    {
        "source" : "http://blog.guykawasaki.com/2007/05/ten_or_so_quest.html#ixzz0giEIX0zY",
        "questions":
            [
            {
            "Question": "How much money does World Vision raise every year?",
            "Answer": "Worldwide, World Vision raises about $2 billion annually; the U.S. office, which I head up, raises about half of the total."
            },
            {
            "Question": "Is this the 80/20 rule where twenty percent of the people send in eighty percent of the money or are donations more spread out?",
            "Answer": "World Vision's strength is that we are supported by hundreds of thousands of faithful people who give us about a dollar a day by sponsoring children. Our \"major donors\" account for less than five percent of our total income. Also, for a non-profit, we have quite a diversified portfolio of revenue. Just over forty percent is cash from private citizens; thirty percent is government grants in food and cash; and about thirty percent are products donated from corporation--what we call \"gifts-in-kind.\""
            }
            ]
    }
}

其中解析代码为 

void buildObjectFromFile()
{
    try
    {
        String x = "";
        InputStream is = this.getResources().openRawResource(R.raw.interview);
        byte [] buffer = new byte[is.available()];
        while (is.read(buffer) != -1);
        String json = new String(buffer);
        obj = new JSONObject(json);
        x = obj.getString("firstname") + " " + obj.getString("lastname") + "n";
        x += obj.getString("occupation") + "n";

        JSONObject interview =  obj.getJSONObject("interview");
        x += "Interview source:" + interview.getString("source")  + "n";

        JSONArray questions = interview.getJSONArray("questions");
        x += "Number of questions: " + questions.length()  + "nn";

        int i;
        for (i=0;i<questions.length();i++)
        {
            JSONObject qa = questions.getJSONObject(i);
            x += "------------n";
            x += "Q" + (i+1) + ". " + qa.getString("Question") + "nn";
            x += "A" + (i+1) + ". " + qa.getString("Answer") + "n";
        }
        setStatus(x);
    }
    catch (Exception je)
    {
        setStatus("Error w/file: " + je.getMessage());
    }
}