Android数据(来自mysqli的输出)无法在TextView中工作。
Android数据(来自mysqli的输出)无法在TextView中工作。
提问于 2016-09-09 09:37:01
我正在为显示从PHP输出到TextView的json数据做一些基本测试。
TextView mTxtDisplay;
String url = "http://192.168.1.102/web_service/test.php/";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTxtDisplay = (TextView) findViewById(R.id.tv);
JsonObjectRequest jsObjRequest = new JsonObjectRequest
(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
mTxtDisplay.setText(response.toString());
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsObjRequest);
}}192.168.1.102/web_service/test.php
$sql="SELECT * FROM item where uid='1'";
$result = mysqli_query($conn, $sql);
$myArray = array();
if (mysqli_num_rows($result) > 0) {
while($row = $result->fetch_array(MYSQL_ASSOC)) {
$myArray[] = $row;
}
echo json_encode($myArray);
}输出
[{"iid":"482","uid":"1","item_id":"1","item_name":"Chicken Rice","item_price":"1","item_quantity":"1","status":"0"},
{"iid":"483","uid":"1","item_id":"1","item_name":"French Fries","item_price":"1","item_quantity":"1","status":"0"},
{"iid":"484","uid":"1","item_id":"1","item_name":"apple","item_price":"1","item_quantity":"1","status":"0"},
{"iid":"492","uid":"1","item_id":"1","item_name":"western+italian","item_price":"1","item_quantity":"1","status":"0"},
{"iid":"493","uid":"1","item_id":"1","item_name":"no_cat","item_price":"1","item_quantity":"1","status":"0"}]我想我的儿子是对的？但是它根本不显示在Textview中，，它是空的！没有任何错误，。
之后，我意识到以下格式的数据运行良好(正常的硬代码数组)。
{
"1":{"name":"Superman","date":"20160909","location":"Mars"},
"2":{"name":"Xman","date":"20160909","location":"Galaxy"},
"3":{"name":"Batman","date":"20160909","location":"Earth"}
}因此，这意味着没有"[]“的第二个json数据工作得很好，但是带有"[]”的第一个json数据却不能工作。但这不应该是正确的方式？
编码有什么问题吗？
回答 2
Stack Overflow用户
回答已采纳
发布于 2016-09-09 09:41:33
这是因为[]中的数据是JSONArray而不是JSONObject。而不是JSONObjectRequest，尝试StringRequest，然后将响应打印到EditText/TextView中。您可以通过将数组元素转换为JSONArray来访问它们。
JSONArray arr=new JSONArray(response);Stack Overflow用户
发布于 2016-09-09 11:20:39
与JSONObjectRequest尝试使用StringRequest不同，您的代码如下所示：
StringRequest jsonReq = new StringRequest(Request.Method.POST,
URL, new Response.Listener<String>() {
@Override
public void onResponse(String s) {
Log.d("Response", s);
textView.setText(s)
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//do error code here..
}
}) {
@Override
public Map<String, String> getParams(){
Map<String, String> params = new HashMap<String, String>();
params.put("param1", value);
return params;
}
};getParams用于向具有用户定义值的服务器发送请求或在运行时获取某些特定数据。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/39416968
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