所以我一直在尝试为android中的自动完成文本视图添加建议列表。我已经添加了一个onClickListener。每当onCLick被触发时。我创建了一个适配器和一个名为mylist（ArrayList）的数据结构。我看不到任何错误，但同时自动完成功能无法正常工作。我很确定我找不到一些小故障。请告诉我哪里出错了。 TIA。
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
user_input = findViewById(R.id.autoCompleteTextView1);
Log.i("here", "something");
user_input.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.i("here", "something");
String symbol_auto = String.valueOf(user_input.getText());
String company_auto = "http://us-east-2.elasticbeanstalk.com/autocomplete/"+symbol_auto;
requestQueue = Volley.newRequestQueue(MainActivity.this);
JsonArrayRequest arrayreq = new JsonArrayRequest(company_auto+symbol_auto,
new Response.Listener<JSONArray>() {
// Takes the response from the JSON request
@Override
public void onResponse(JSONArray response) {
try {
JSONObject jsonobj = response.getJSONObject(0);
data = jsonobj.getString("Name");
mylist.add(data);
Log.i("here", data);
ArrayAdapter adapter = new ArrayAdapter(MainActivity.this,android.R.layout.select_dialog_item, mylist);
user_input.setThreshold(1);
user_input.setAdapter(adapter);
}
// Try and catch are included to handle any errors due to JSON
catch (JSONException e) {
// If an error occurs, this prints the error to the log
e.printStackTrace();
}
}
},
// The final parameter overrides the method onErrorResponse() and passes VolleyError
//as a parameter
new Response.ErrorListener() {
@Override
// Handles errors that occur due to Volley
public void onErrorResponse(VolleyError error) {
Log.e("Volley", "Error");
}
}
);
// Adds the JSON array request "arrayreq" to the request queue
requestQueue.add(arrayreq);
}
});
}
我已经尝试手动向myList添加元素，它就像魅力一样，但是一旦我在查询到后端后尝试添加它，下拉列表就不会出现了。我的后端工作正常。我已经验证了。
答案 0 :(得分：0)
您必须迭代元素并将每个元素添加到列表中，然后设置适配器。
new Response.Listener<JSONArray>() {
// Takes the response from the JSON request
@Override
public void onResponse(JSONArray response) {
try {
mylist = new ArrayList();
for (int i = 0; i< response.length(); i++){
JSONObject jsonobj = response.getJSONObject(i);
String value = jsonobj.getString("Name");
mylist.add(value);
Log.i("here", value);
}
ArrayAdapter adapter = new ArrayAdapter(MainActivity.this,android.R.layout.select_dialog_item, mylist);
user_input.setThreshold(1);
user_input.setAdapter(adapter);
}
// Try and catch are included to handle any errors due to JSON
catch (JSONException e) {
// If an error occurs, this prints the error to the log
e.printStackTrace();
}
}
},
更新 - 使用OnClickListener触发事件
user_input.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.i("here", "something");
String symbol_auto = String.valueOf(user_input.getText());
String company_auto = "http://us-east-2.elasticbeanstalk.com/autocomplete/"+symbol_auto;
requestQueue = Volley.newRequestQueue(MainActivity.this);
JsonArrayRequest arrayreq = new JsonArrayRequest(company_auto+symbol_auto,
new Response.Listener<JSONArray>() {
// Takes the response from the JSON request
@Override
public void onResponse(JSONArray response) {
try {
mylist = new ArrayList();
for (int i = 0; i < response.length(); i++){
JSONObject jsonobj = response.getJSONObject(i);
String value = jsonobj.getString("Name");
mylist.add(value);
Log.i("here", value);
}
ArrayAdapter adapter = new ArrayAdapter(MainActivity.this,android.R.layout.select_dialog_item, mylist);
user_input.setThreshold(1);
user_input.setAdapter(adapter);
}
// Try and catch are included to handle any errors due to JSON
catch (JSONException e) {
// If an error occurs, this prints the error to the log
e.printStackTrace();
}
}
},
// The final parameter overrides the method onErrorResponse() and passes VolleyError
//as a parameter
new Response.ErrorListener() {
@Override
// Handles errors that occur due to Volley
public void onErrorResponse(VolleyError error) {
Log.e("Volley", "Error");
}
}
);
// Adds the JSON array request "arrayreq" to the request queue
requestQueue.add(arrayreq);
}
});