java 如何将数据添加到 json 数组而不是 ArrayList 中？
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How to add data into a json array instead of a ArrayList?
提问by
What I am trying to do is add a Map into an ArrayListand then into a JsonArray. What I intend to do is directly add the maps into the json array.
我想要做的是将 Map 添加ArrayList到JsonArray. 我打算做的是直接将地图添加到 json 数组中。
//Initialize the ArrayList,Map and Json array
private ArrayList<Map<String, String>> itemData = new ArrayList<>();
private Map<String, String> itemselected = new HashMap<>();
JSONArray itemSelectedJson = new JSONArray();
private void selectedItems() {
if(invEstSwitch.isChecked())
{
billType = textViewEstimate.getText().toString();
}else{
billType = textViewInvoice.getText().toString();
}
itemselected.put("custInfo",custSelected.toString());
itemselected.put("invoiceNo", textViewInvNo.getText().toString());
itemselected.put("barcode", barCode.getText().toString());
itemselected.put("desc", itemDesc.getText().toString());
itemselected.put("weight", weightLine.getText().toString());
itemselected.put("rate", rateAmount.getText().toString());
itemselected.put("makingAmt", makingAmount.getText().toString());
itemselected.put("net_rate", netRate.getText().toString());
itemselected.put("itemTotal", itemtotal.getText().toString());
itemselected.put("vat", textViewVat.getText().toString());
itemselected.put("sum_total", textViewSum.getText().toString());
itemselected.put("bill_type", billType);
itemselected.put("date", textViewCurrentDate.getText().toString());
//Add the map to the Array
itemData.add(index, itemselected);
itemSelectedJson= new JSONArray(Arrays.asList(itemData));
index++;
}
回答by Hiren Patel
You can do this way:
你可以这样做：
JSONArray jRootArray = new JSONArray();
for (int i = 1; i <= 20; i++) {
JSONObject jInnerObject = new JSONObject();
try {
jInnerObject.put(String.valueOf(i), "Hello "+i);
} catch (JSONException e) {
e.printStackTrace();
}
jRootArray.put(jInnerObject);
}
Log.i("JRootArray", jRootArray.toString());
Hope this will help you.
希望这会帮助你。
回答by Mohammed Aouf Zouag
Try this:
试试这个：
private Map<String, String> itemselected = new HashMap<>();
private void selectedItems() {
JSONArray itemSelectedJson = new JSONArray();
// Retrieve all keys
Set<String> keys = itemselected.keySet();
// Add items to JSONArray as JSONObjects
for(String key : keys) {
itemSelectedJson.put(
new JSONObject().put(key, itemselected.get(key))
);
}
}
This way, you won't have to pass by an ArrayListto fill your JSONArray. Then, you can get your JSON stringsimply by calling the toString()method on the JSON array:
这样，您就不必通过 anArrayList来填充您的JSONArray. 然后，您可以通过调用JSON 数组上的方法来获取您的JSON 字符串toString()：
String jsonString = itemSelectedJson.toString();
