Android / Java Json 对象计数
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Android / Java Json Objects count
提问by Deniz Celebi
I'm parsing in android a json api which looks like this:
我在 android 中解析一个 json api，它看起来像这样：
[
{
"id":70,
"number_of_devices":12,
},
{
"id":71,
"number_of_devices":5,
}
]
Now I want to get the total count of all devices and display it inside a textview and the total count of all id's and display this inside another textview. Can any one give me an example how to do this, or any tutorial about this ?
现在我想获取所有设备的总数并将其显示在一个文本视图中，以及所有 id 的总数并将其显示在另一个文本视图中。任何人都可以给我一个如何做到这一点的例子，或者任何关于这个的教程？
Thanks for any help
谢谢你的帮助
采纳答案by Xithias
If you've got your JSON in a String (myString):
如果您将 JSON 放入字符串 (myString) 中：
JSONArray mArray = new JSONArray(myString);
int id_count = 0;
int devices_count = 0;
int tmp = 0;
for (int i = 0; i<mArray.length(); i++) {
try {
tmp = mArray.getJSONObject(i).getInt("id");
id_count = id_count + 1;
}
catch (JSONException e) {
// If id doesn't exist, this exception is thrown
}
try {
tmp = mArray.getJSONObject(i).getInt("number_of_devices");
devices_count = devices_count + 1;
}
catch (JSONException e) {
// If number_of_devices doesn't exist, this exception is thrown
}
}
myTextView1.text = String.ValueOf(id_count);
myTextView2.text = String.ValueOf(devices_count);
回答by bobby.dhillon
Here you can try save json into String called jsonString
在这里您可以尝试将 json 保存到名为 jsonString 的 String 中
JSONArray jsonArray = new JSONArray(jsonString );
int count = jsonArray.length();
For adding to text view.
用于添加到文本视图。
for(int i = 0; i< jsonArray.length();i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
TextView tv = new TextView(getApplicationContext());
tv.setText(jsonObject.getString("your_key"));
}
