单击列表时微调数据复制 [英] Spinner data duplicated when list is clicked
问题描述
在活动B处有一个微调，其中的数据来自的MySQL （表位置）获得。
In Activity B there has a spinner where the data were get from MySQL (Table location).
活动B
private ArrayList<String> froms;
private JSONArray resultFrom;
public void addItemsOnFrom() {
travelFrom = (Spinner) findViewById(R.id.travelFrom);
StringRequest stringRequest = new StringRequest(Configs.FROM_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONObject j = null;
try {
//Parsing the fetched Json String to JSON Object
j = new JSONObject(response);
//Storing the Array of JSON String to our JSON Array
resultFrom = j.getJSONArray(Configs.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getFrom(resultFrom);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
//Creating a request queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
private void getFrom(JSONArray j) {
//Traversing through all the items in the json array
for (int i = 0; i < j.length(); i++) {
try {
//Getting json object
JSONObject json = j.getJSONObject(i);
//Adding the name of the student to array list
froms.add(json.getString(Configs.TAG_LOCATION));
} catch (JSONException e) {
e.printStackTrace();
}
}
//Setting adapter to show the items in the spinner
travelFrom.setAdapter(new ArrayAdapter<String>(Add_Details_Information.this, android.R.layout.simple_spinner_dropdown_item, froms));
}
在保存按钮被点击，它将返回选定值（办公室）到活动A 的ListView 。而在活动A，当列表pressed，它将意图活动B.在这个时候，在活动B微调将首先显示所选的项目（办公室）。
When save button is clicked, it will return the selected value(OFFICE) to Activity A listView. And in Activity A, when the list is pressed, it will intent to Activity B. In this time, the spinner in Activity B will display the selected item first(OFFICE).
**Table location** // table location has 2 data
NONE
OFFICE
赴任是B.选择当单击列表中，我首先要在微调 B.
code中的活动B 显示OFFICE第一。
Code in Activity B for display OFFICE first.
if(getIntent().getExtras()!=null)
{
final String from = getIntent().getStringExtra("from");
selectedItemFrom(from);
}
public void selectedItemFrom(final String value)// display OFFICE first
{
travelFrom = (Spinner) findViewById(R.id.travelFrom);
StringRequest stringRequest = new StringRequest(Configs.FROM_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONObject j = null;
try {
//Parsing the fetched Json String to JSON Object
j = new JSONObject(response);
//Storing the Array of JSON String to our JSON Array
result = j.getJSONArray(Configs.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getFrom(result, value);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
//Creating a request queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
private void getFrom(JSONArray j, String value) {
int position = 0;
//Traversing through all the items in the json array
for (int i = 0; i < j.length(); i++) {
try {
//Getting json object
JSONObject json = j.getJSONObject(i);
//Adding the name of the student to array list
froms.add(json.getString(Configs.TAG_LOCATION));
if (froms.get(i).equalsIgnoreCase(value)) {
position = i;
//Toast.makeText(getApplicationContext(),position+"",Toast.LENGTH_LONG).show();
break;
}
} catch (JSONException e) {
e.printStackTrace();
}
}
travelFrom.setAdapter(new ArrayAdapter<String>(Add_Details_Information.this, android.R.layout.simple_spinner_dropdown_item, froms));
travelFrom.setSelection(position);
}
办公室可以先显示，但问题是，当我检查了微调B，它显示了 NONE，OFFICE，无办公室 ..Why微调数据将得到复制？谢谢
The OFFICE can display first, but the problem is when I checked the spinner B, it shows NONE,OFFICE,NONE OFFICE ..Why the spinner data will get duplicated ? Thanks
我认为问题出在这一行 travelFrom.setAdapter（新ArrayAdapter＆LT;串GT;（Add_Details_Information.this，android.R.layout.simple_spinner_dropdown_item，320交织））; 。 ..但如何解决？有人吗？
I think problem is in this line travelFrom.setAdapter(new ArrayAdapter<String>(Add_Details_Information.this, android.R.layout.simple_spinner_dropdown_item, froms));...But how to solve??? Anyone?
有时微调将首先显示所选的项目，但有时它不会...什么都写的更好的办法？
And sometimes the spinner will display the selected item first but sometimes it will not...What are the better way to write?
修改
{"result":[{"name":"NONE"},{"name":"OFFICE"}]}
我现在在这两个GETFROM方法的开始把forms.clear。但问题是，当我选择NONE并返回到A，然后再次进入B，微调目前拥有NONE只有...
I put forms.clear in beginning of both getFrom method now. But the problem is when I select NONE and return to A, then goes to B again,the spinner now has NONE only...
推荐答案
请尝试这样的事情。
此活动将期待着与从被设置为NONE或键 A意图办公室。如果意图不具有数据，那么将默认为任何插入到微调第一。
This activity will expect a Intent with the key "from" that is set to either "NONE" or "OFFICE". If the intent does not have the data, then it will default to whatever was inserted into the Spinner first.
public class MainActivity extends AppCompatActivity {
private Spinner travelFrom;
private ArrayAdapter<String> mSpinnerAdapter;
private List<String> mSpinnerData;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String from = null;
Bundle extras = getIntent().getExtras();
if (extras != null) {
from = extras.getString("from");
}
setupFromSpinner(from);
}
private void setupFromSpinner(final String value) {
travelFrom = (Spinner) findViewById(R.id.travelFrom);
mSpinnerData = new ArrayList<String>();
mSpinnerAdapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, mSpinnerData);
mSpinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
travelFrom.setAdapter(mSpinnerAdapter);
JsonObjectRequest req = new JsonObjectRequest(Configs.FROM_URL,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
mSpinnerData.clear();
try {
JSONArray resultFrom = response.getJSONArray("result");
for (int i = 0; i < resultFrom.length(); i++) {
JSONObject fromObj = resultFrom.getJSONObject(i);
String name = fromObj.getString("name");
mSpinnerData.add(name);
}
mSpinnerAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
if (value != null) {
int position = mSpinnerAdapter.getPosition(value);
travelFrom.setSelection(position);
} else {
travelFrom.setSelection(0);
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}
);
//Creating a request queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(req);
}
}
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