[英]Passing Data from Fragment listview item to Activity string variable onitemclicklistener
我試圖將ListView項目從片段傳遞到活動中的字符串變量“ url”,該意圖成功創建了活動,但是當我嘗試傳遞數據時卻在其中運行問題。 fragment類具有一個帶有json數據的listview,它顯示了picture,title和name的列表。 當用戶選擇一個項目時,它將帶他們到活動中。 我希望他們的選擇將名稱從列表視圖轉移到其他活動中的url變量。 “這樣的URL從改變://.....id= HTTPS ”到“ HTTPS://.....id= ” + 名字從片段。 多數民眾贊成將使recyclerview更改為新的url,單擊任何listview項目。
我的片段:
public class Accueil extends Fragment {
ArrayList<articles> arrayList;
ListView lv;
public static String URL1=null;
class ReadJSON extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... params) {
return readURL(params[0]);
}
@Override
protected void onPostExecute(String content) {
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(content);
} catch (JSONException e1) {
e1.printStackTrace();
}
JSONArray jsonArray = null;
try {
jsonArray = jsonObject.getJSONArray("articles");
} catch (JSONException e1) {
e1.printStackTrace();
}
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject articlesobject = null;
try {
articlesobject = jsonArray.getJSONObject(i);
} catch (JSONException e1) {
e1.printStackTrace();
}
try {
arrayList.add(new articles(
articlesobject.getString("picture"),
articlesobject.getString("title"),
articlesobject.getString("name")
));
} catch (JSONException e1) {
e1.printStackTrace();
}
CustomListAdaper adaper = new CustomListAdaper(
getActivity().getApplicationContext(),
R.layout.custom_list_layout, arrayList
);
lv.setAdapter(adaper);
}
}
private String readURL(String theURL) {
StringBuilder content = new StringBuilder();
try {
URL url = new URL(theURL);
URLConnection urlConnection = url.openConnection();
BufferedReader bufferedReader = new BufferedReader(new
InputStreamReader(urlConnection.getInputStream()));
String line;
while ((line = bufferedReader.readLine()) != null) {
content.append(line + "\n");
}
bufferedReader.close();
} catch (Exception e) {
e.printStackTrace();
}
return content.toString();
}
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
arrayList = new ArrayList<>();
View rootView = inflater.inflate(R.layout.accueil, container, false);
lv = (ListView) rootView.findViewById(R.id.ListView1);
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
new Accueil.ReadJSON().execute("http://wach.ma/mobile/home.php");
}
});
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int
position, long id) {
String selectedFromList =
(lv.getItemAtPosition(position).toString());
Intent i = new Intent(getActivity(), Test.class);
i.putExtra("name", selectedFromList);
startActivity(i);
}
});
return rootView;
}
}
我的活動:
public class Test extends AppCompatActivity {
public String URL_DATA="http://wach.ma/mobile/category.php?id=";
private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;
private List<ListItem> listItems;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
listItems = new ArrayList<>();
Intent i = getIntent();
String s1 = i.getStringExtra("name");
URL_DATA=URL_DATA+s1;
loadRecyclerViewData();
}
private void loadRecyclerViewData(){
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Chargement...");
progressDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.GET,
URL_DATA, new Response.Listener<String>() {
@Override
public void onResponse(String s) {
progressDialog.dismiss();
try {
JSONObject jsonObject = new JSONObject(s);
JSONArray array = jsonObject.getJSONArray("articles");
for(int i = 0; i<array.length();i++){
JSONObject o = array.getJSONObject(i);
ListItem item = new ListItem(
o.getString("picture"),
o.getString("name"),
o.getString("city"),
o.getString("add_time"),
o.getString("price")
);
listItems.add(item);
}
adapter = new Myadapter(listItems, getApplicationContext());
recyclerView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
Toast.makeText(getApplicationContext(),
volleyError.getMessage(), Toast.LENGTH_LONG).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
預先謝謝你,我對我的英語不好對不起
我認為您的問題來自於此: String selectedFromList = (lv.getItemAtPosition(position).toString());
lv.getItemAtPosition(position)
返回一個Object,它是listView Adapter的一項! 在此對象上調用toString()
不會返回任何結果:)
OnClickListener具有一個View in參數,它是父視圖,在您的情況下是您單擊的Item視圖。 您可以在OnClickListener中檢索包含name字段的TextView,並獲取此TextView的字符串,如下所示:
@Override
public void onItemClick(AdapterView<?> parent, View view, int postion, long id) {
String name = ((TextView) view.findViewById(R.id.myNameField)).getText().toString();
}
希望對您有所幫助:)
PS:下次也發布您的XML代碼;)
我將其修復,只需對此進行更改:
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int
position, long id) {
String selectedFromList =
(lv.getItemAtPosition(position).toString());
Intent i = new Intent(getActivity(), Test.class);
i.putExtra("name", selectedFromList);
startActivity(i);
}
});
return rootView;
對此:
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int
position, long id) {
String selectedFromList=
String.valueOf(arrayList.get(position).getIdd());
Intent i = new Intent(getActivity(), Test.class);
i.putExtra("name", selectedFromList);
startActivity(i);
}
});
return rootView;
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