ANDROID：保存第一个项目后，将列表视图中的下一个项目获取到editText

Question

What I have: (1st Functionality) I have a listview activity populated with items from JSON url. I have another activity where I get the listItem to editText field and then click "save", which saves the value to dB.

What I additionally want: (2nd Functionality) When I click save, rather than going back to listview and select next listItem, I want the editText to fill the new listItem for me. But I am making errors in every step.

Below is the code that I have for 1st Functionality. I know it is just few lines to achieve the 2nd functionality but struggling with that.

The problem here is I cannot call the list String variable from one activity to another and assign position or a counter to it. Suggest me what to change here.

MainActivity.java (Class containing ListView populated with item from json url)

package com.example.app.listview;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;
import android.os.AsyncTask;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends AppCompatActivity {

    ListView listView;
    ArrayList<String> tutorialList = new ArrayList<String>();

    private final static String URL = "-----json------url----file";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new FetchDataTask().execute(URL);

    }

    private class FetchDataTask extends AsyncTask<String, Void, String>{

        @Override
        protected String doInBackground(String... params) {

            InputStream inputStream = null;
            String result= null;
            HttpClient client = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(params[0]);

            try {

                HttpResponse response = client.execute(httpGet);
                inputStream = response.getEntity().getContent();

                // convert inputstream to string
                if(inputStream != null){
                    result = convertInputStreamToString(inputStream);
                    Log.i("App", "Data received:" +result);

                }
                else
                    result = "Failed to fetch data";

                return result;

            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onPostExecute(String dataFetched) {
            //parse the JSON data and then display
            parseJSON(dataFetched);
        }


        private String convertInputStreamToString(InputStream inputStream) throws IOException{
            BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
            String line = "";
            String result = "";
            while((line = bufferedReader.readLine()) != null)
                result += line;

            inputStream.close();
            return result;

        }

        private void parseJSON(String data){

            try{
                JSONArray jsonMainNode = new JSONArray(data);

                int jsonArrLength = jsonMainNode.length();

                for(int i=0; i < jsonArrLength; i++) {
                    JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);
                    String postTitle = jsonChildNode.getString("codeid");
                    tutorialList.add(postTitle);
                }

                // Get ListView object from xml
                listView = (ListView) findViewById(R.id.list);

                // Define a new Adapter
                ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, android.R.id.text1, tutorialList);

//                 Assign adapter to ListView
                listView.setAdapter(adapter);
                        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                            @Override
                            public void onItemClick(AdapterView<?> parent, View view, int i, long id) {
                                Intent intent =  new Intent(MainActivity.this, AddFlowerInfo.class);
                                intent.putExtra("Code", listView.getItemAtPosition(i).toString());
                                startActivity(intent);
                            }
        });

            }catch(Exception e){
                Log.i("App", "Error parsing data" +e.getMessage());

            }
        }
    }
}

editText.java (class containing editText field and save to dB)

package com.example.app.listview;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.util.Log;
import android.view.View;

public class AddFlowerInfo extends AppCompatActivity  {
    EditText editText; //non editable codeid <<----<<----<<----<<--<<---<<1
    private static final String TAG = "AddFlowerInfo";

    Button savedata;
    String noneditcode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_flower_info);
        editText = (EditText) findViewById(R.id.codeid);
        savedata = (Button) findViewById(R.id.saveflowerinfo);

        final String Codeholder = getIntent().getStringExtra("Code");
        editText.setText(Codeholder);
      }

    public void dataflowerinfo(View view){

        noneditcode = editText.getText().toString();


        String method = "FlowerInfo";
        BackgroundTask2 backgroundTask2 = new BackgroundTask2(this);
        backgroundTask2.execute(method, noneditcode);
        finish();

    }

UPDATE AddFlowerInfo.java (OnCreate) and (OnClick)

public class AddFlowerInfo extends AppCompatActivity  {
    EditText editText; //non editable codeid <<----<<----<<----<<--<<---<<1
    private static final String TAG = "AddFlowerInfo";

    Button savedata;
    int i=0;

    String noneditcode;
    int pos;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_flower_info);
        editText = (EditText) findViewById(R.id.codeid);
        savedata = (Button) findViewById(R.id.saveflowerinfo);

        Intent i =getIntent();
        final ArrayList<String> list = i.getStringArrayListExtra("key");
          pos = i.getIntExtra("position", 0);

//        final String Codeholder = getIntent().getStringExtra("Code");
        editText.setText(list.get(pos));

        savedata.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent =  new Intent(AddFlowerInfo.this, AddFlowerInfo.class);
                startActivity(intent);

                ++pos;
                if(pos<=list.size()-1)

                    list.get(pos);

            }
        });

Answer 1

Pass your data from activity like this

 ArrayList<String> tutorialList = new ArrayList<String>();  
 Intent intent = new Intent(ActivityName.this, Second.class);
 intent.putStringArrayListExtra("key", tutorialList);
 startActivity(intent);

To retrive at AddFlowerInfo

Intent i = getIntent();  
ArrayList<String> list = i.getStringArrayListExtra("key");

Then as you are retrieving data from list using position ,each time after saving call data at next position

Answer 2

You need to send complete array to AddFlowerInfo with the position, so change your onItemClick code:

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int i, long id) {
                Intent intent =  new Intent(MainActivity.this, AddFlowerInfo.class);
                intent.putExtra("position", i);
                intent.putStringArrayListExtra("array",tutorialList);
                startActivity(intent);
            }
        });

Now in AddFlowerInfo :

 Intent i = getIntent();
        ArrayList<String> tutorialList = i.getStringArrayListExtra("array");
        int pos=i.getIntExtra("position",0);

Use this position to get item from tutorialList .

To update data when user gets back to previous activity, place this code:

 new FetchDataTask().execute(URL);

into onResume method.

Update

After saving first item to edit second item use:

++pos;
if(pos<=tutorialList.size()-1)
    editText.setText(tutorialList.get(pos)); 
else
 {
   // you are after last item do whatever you want
 }