按下时显示新列表的新 ID
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【中文标题】按下时显示新列表的新 ID【英文标题】：Show new id for newly list when it is pressed 【发布时间】：2016-04-17 08:13:50 【问题描述】：我想知道按下时如何显示新列表id？目前，新列表显示的是旧列表 ID，但当我关闭应用并再次打开它时，它会显示其 ID。
首先，数据将从mysql 检索并加载到android listView。 （假设它只有一个列表）。
ListView listViewUpdate;
String ID, iD;
public static final int PROJECT_REQUEST_CODE = 1;
public static final int CAMERA_REQUEST_CODE = 2;
int mClickedPosition;
String ReceiveProject, ReceiveDescription, ReceiveTimeIn, ReceiveTimeOut;
Integer ReceiveProgress;
String myJSON;
JSONArray details = null;
TextView totalHours;
String MiNtimeIn,MaXtimeOut;
List<DetailsBean> details1=new ArrayList<>();
CustomBaseAdapter objadapter;
public void BuildEditDetails(final String ID) // Assume the ID is foreign key
class GetDataJSON extends AsyncTask<String, Void, String>
@Override
protected String doInBackground(String... params)
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("http://192.168.107.115/Android/CRUD/detailsRetrieve.php?id=" + ID);
// Depends on your web service
httppost.setHeader("Content-type", "application/json");
InputStream inputStream = null;
String result = null;
try
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
sb.append(line + "\n");
result = sb.toString();
catch (Exception e)
// Oops
finally
try
if (inputStream != null) inputStream.close();
catch (Exception squish)
return result;
@Override
protected void onPostExecute(String result)
myJSON = result;
showList();
GetDataJSON g = new GetDataJSON();
g.execute();
protected void showList()
try
JSONObject jsonObj = new JSONObject(myJSON);
details = jsonObj.getJSONArray(Configs.TAG_RESULTS);
for (int i = 0; i < details.length(); i++)
JSONObject c = details.getJSONObject(i);
String project = c.getString(Configs.TAG_PROJECT);
String description = c.getString(Configs.TAG_WORKDESCRIPTION);
int percentage = c.getInt(Configs.TAG_PERCENTAGE);
String in = c.getString(Configs.TAG_IN);
String out = c.getString(Configs.TAG_OUT);
iD = c.getString(Configs.TAG_ID); // its real id
DetailsBean dbean=new DetailsBean(iD,project,description,percentage,in,out);
details1.add(dbean);
objadapter=new CustomBaseAdapter(getActivity(),details1);
listViewUpdate.setAdapter(objadapter);
catch (JSONException e)
e.printStackTrace();
当点击钢笔图标(mClickedPosition==-1)，它会意图Activity B，并在Activity A中添加一个新列表强>listView。如果按下列表**(mClickedPosition!==1)，它会显示它的 id，并意图 **B 供用户编辑。
listViewUpdate.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> listView, View view,
int position, long id)
mClickedPosition = position;
String iD = details1.get(position).getID();
Intent intent = new Intent(getActivity(), Edit_Details.class);
intent.putExtra("iD", iD);
intent.putExtra("ID", ID);
intent.putExtra("mClickedPosition", mClickedPosition);
Toast.makeText(getActivity(), "This is" + iD + ID, Toast.LENGTH_LONG).show();
startActivityForResult(intent, PROJECT_REQUEST_CODE);
);
@Override public boolean onOptionsItemSelected(MenuItem item)
switch (item.getItemId())
case R.id.addDetails:
mClickedPosition = -1;
Intent intent = new Intent(getActivity(), Edit_Details.class);
intent.putExtra("ID", ID);
// intent.putExtra("iD", iD);
startActivityForResult(intent, PROJECT_REQUEST_CODE);
break;
OnActivityResult 活动 A
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) // receive from Activity B and populate ListView A
if (resultCode == Activity.RESULT_OK)
if (requestCode == PROJECT_REQUEST_CODE)
ReceiveProject = data.getStringExtra("project1");
ReceiveDescription = data.getStringExtra("description");
ReceiveProgress = data.getIntExtra("progress", 0);
ReceiveTimeIn = data.getStringExtra("timeIn");
ReceiveTimeOut = data.getStringExtra("timeOut");
if(mClickedPosition==-1)
// add list
if(objadapter!=null)
objadapter.addNewItem(iD,ReceiveProject,ReceiveDescription,ReceiveProgress,ReceiveTimeIn,ReceiveTimeOut);
else
// update list
if(objadapter!=null)
objadapter.changeItem(mClickedPosition,iD,ReceiveProject,ReceiveDescription,ReceiveProgress,ReceiveTimeIn,ReceiveTimeOut);
最后是 CustomBaseAdapter
public class CustomBaseAdapter extends ArrayAdapter<DetailsBean> // for ListView
Activity context;
List<DetailsBean> details;
public CustomBaseAdapter(Activity context,List<DetailsBean> details)
super(context, R.layout.retrieve_details, details);
this.context = context;
this.details = details;
public void changeItem(int m,String ID,String Project,String Description,int Percentage,String in,String out)
DetailsBean obj = new DetailsBean(ID, Project, Description, Percentage, in, out);
obj.setProject(Project);
obj.setProgress(Percentage+"");
obj.setTimeIn(in);
obj.setTimeOut(out);
obj.setDescription( Description);
details.set(m,obj);
this. notifyDataSetChanged();
public void addNewItem(String ID,String Project,String Description,int Percentage,String in,String out)
DetailsBean obj = new DetailsBean(ID, Project, Description, Percentage, in, out);
obj.setProject(Project);
obj.setProgress(Percentage+"");
obj.setTimeIn(in);
obj.setTimeOut(out);
obj.setDescription( Description);
details.add(obj);
this.notifyDataSetChanged();
新列表已经可以添加到上一个列表的下方，但是当我点击 新列表，它仍然显示旧列表 id..我怎样才能做到 显示它的ID？谢谢
当来到这个类时，它从 MySQL 中检索值
当我点击 1 个列表或 2 个列表时，它会显示它们的 id，（1 和 2）
现在我添加了一个新列表，现在添加了 3 个列表
当我点击第三个列表时，它应该显示 3 但它显示 2
【问题讨论】：
您的意思是，notifyDataSetChanged() 不会更新您的列表视图？
@Vyacheslav no..我可以看到列表视图中添加了一个新列表，但是当我单击新列表时，它会显示旧列表 ID。如果我关闭应用程序并重新打开它，只有它会显示它的 id
【参考方案1】：
按下时显示新列表的新ID
使用AddMore 类的onPostExecute 获取最新的id 并将数据发送回之前的Activity.like：
@Override
protected void onPostExecute(String s)
super.onPostExecute(s);
loading.dismiss();
try
JSONObject jsonObject=new JSONObject(s);
int latestID=jsonObject.optInt("lastId");
//call setResult here
....
returnIntent.putExtra("project1", project1);
returnIntent.putExtra("description", description);
returnIntent.putExtra("progress", progress);
returnIntent.putExtra("timeIn", timeIn);
returnIntent.putExtra("iD", latestID); //<<<
catch(Exception ex)
【讨论】：
【参考方案2】：尝试在适配器CustomBaseAdapter 类中：
public List<DetailsBean> getDetails()
return details;
在 onItemClick 中
@Override
public void onItemClick(AdapterView<?> listView, View view,
int position, long id)
mClickedPosition = position;
String iD = listViewUpdate.getDetails().get(position).getID();
//so check id here
....
查看onActivityResult:
iD 是什么？这个变量的值是多少？
objadapter.addNewItem(iD,ReceiveProject,ReceiveDescription,ReceiveProgress,ReceiveTimeIn,ReceiveTimeOut
【讨论】：
它们听起来一样吗？我在 CustomBaseAdapter 中有这个public DetailsBean getItem(int position) return details.get(position);
我使用你的代码，新列表仍然显示旧列表 id :(
@Tony ，调试模式下显示哪些值？您在onItemClick 中看到旧列表了吗？
是的，我看到了。再次查看我的帖子。从Activity B(Edit_Details)获取新值并返回到onActivityResultActivity A以上是关于按下时显示新列表的新 ID的主要内容，如果未能解决你的问题，请参考以下文章