Android ListView适配器在单击时显示最后一项

我的ListView适配器有问题，所有内容都通过json解析到列表视图中，但当我单击ListView时，它总是显示ListView中最后解析的json的结果

这是我的第一堂课叫乔布斯：

 public class Jobs extends ListActivity {

// JSON Node names
private static final String jobs = "jobs";
private static final String job = "job";
private static final String pays = "pays";
private static final String ready_at = "ready_at";
private static final String due_by = "due_by";
private static final String customer_reference = "customer_reference";
private static final String pieces = "pieces";
private static final String weight = "weight";
private static final String pickup_name = "pickup_name";
private static final String pickup_addr1 = "pickup_addr1";
private static final String pickup_city = "pickup_city";
private static final String pickup_state = "pickup_state";
private static final String pickup_zip_postal = "pickup_zip_postal";
private static final String deliver_name = "deliver_name";
private static final String deliver_addr1 = "deliver_addr1";
private static final String deliver_city = "deliver_city";
private static final String deliver_state = "deliver_state";
private static final String deliver_zip_postal = "deliver_zip_postal";
private static final String signature_required = "signature_required";
private static final String pickup_to_see = "pickup_to_see";
private static final String pickup_room = "pickup_room";
private static final String pickup_phone = "pickup_phone";
private static final String deliver_to_see = "deliver_to_see";
private static final String deliver_room = "deliver_room";
private static final String pickup_special_instr = "pickup_special_instr";
private static final String deliver_special_instr = "deliver_special_instr";
private static final String deliver_phone = "deliver_phone";

String JOB, PAYS, READY_AT, DUE_BY, CUSTOMER_REFERENCE, PIECES, WEIGHT, PICKUP_NAME, PICKUP_ADDR1, PICKUP_CITY, PICKUP_STATE,
        PICKUP_ZIP_POSTAL, DELIVER_NAME, DELIVER_ADDR1, DELIVER_CITY, DELIVER_STATE, DELIVER_ZIP_POSTAL, SIGNATURE_REQUIRED,
        PICKUP_TO_SEE, PICKUP_ROOM, PICKUP_PHONE, DELIVER_TO_SEE, DELIVER_ROOM, PICKUP_SPECIAL_INSTR, DELIVER_SPECIAL_INSTR,
        DELIVER_PHONE;

// Strings
String username, password, firstName, lastName, lastLatitudeUpdate, dvrcheckin, dvrScheduleToWork, dvrStartTime, jobs_assigned;
int checkedin, Minute, Hour, Minutedvr, Hourdvr, status;

Vibrator vib;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.jobs);
    vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);

    new ParseJobs().execute();


    TextView assigned = (TextView) findViewById(R.id.assigned);

    if (jobs_assigned.matches("0")){
    assigned.setText("You have no jobs assigned");
    } else {
        assigned.setVisibility(View.GONE);
    }


    // selecting single ListView item
    ListView lv = getListView();

    // Launching new screen on Selecting Single ListItem
    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long ide) {

            vib.vibrate(40);

            // Starting new intent
            Intent in = new Intent(getApplicationContext(),
                    SingleMenuItemActivity.class);
            in.putExtra(pays, PAYS);
            in.putExtra(job, JOB);
            in.putExtra(ready_at, READY_AT);
            in.putExtra(due_by, DUE_BY);
            in.putExtra(customer_reference, CUSTOMER_REFERENCE);
            in.putExtra(pieces, PIECES);
            in.putExtra(weight, WEIGHT);
            in.putExtra(pickup_name, PICKUP_NAME);
            in.putExtra(pickup_addr1, PICKUP_ADDR1);
            in.putExtra(pickup_city, PICKUP_CITY);
            in.putExtra(pickup_state, PICKUP_STATE);
            in.putExtra(pickup_zip_postal, PICKUP_ZIP_POSTAL);
            in.putExtra(deliver_name, DELIVER_NAME);
            in.putExtra(deliver_addr1, DELIVER_ADDR1);
            in.putExtra(deliver_city, DELIVER_CITY);
            in.putExtra(deliver_state, DELIVER_STATE);
            in.putExtra(deliver_zip_postal, DELIVER_ZIP_POSTAL);
            in.putExtra(signature_required, SIGNATURE_REQUIRED);
            in.putExtra(pickup_to_see, PICKUP_TO_SEE);
            in.putExtra(pickup_room, PICKUP_ROOM);
            in.putExtra(pickup_phone, PICKUP_PHONE);
            in.putExtra(deliver_to_see, DELIVER_TO_SEE);
            in.putExtra(deliver_room, DELIVER_ROOM);
            in.putExtra(pickup_special_instr, PICKUP_SPECIAL_INSTR);
            in.putExtra(deliver_special_instr, DELIVER_SPECIAL_INSTR);
            in.putExtra(deliver_phone, DELIVER_PHONE);

            startActivity(in);
            Jobs.this.overridePendingTransition(R.anim.fadein, R.anim.fadeout);

        }
    });
}

public class ParseJobs extends AsyncTask<Void, Void, Void> {

    // Hashmap for ListView
    ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();

    // contacts JSONArray
    JSONArray JOBS;

    ProgressDialog VerifyDriver;

    @Override
    protected void onPreExecute() {

        VerifyDriver = ProgressDialog.show(Jobs.this, "Getting Your Jobs", "Loading Data... Please Wait...");
        WindowManager.LayoutParams lp = VerifyDriver.getWindow().getAttributes();
        VerifyDriver.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
        lp.dimAmount = .65f;
        VerifyDriver.getWindow().setAttributes(lp);

        Intent i = getIntent();
        username = i.getExtras().getString("uid");
        password = i.getExtras().getString("pwd");
        firstName = i.getExtras().getString("firstName");
        lastName = i.getExtras().getString("lastName");
        lastLatitudeUpdate = i.getExtras().getString("lastLatitudeUpdate");
        Minute = i.getExtras().getInt("Minute");
        Hour = i.getExtras().getInt("Hour");
        dvrcheckin = i.getExtras().getString("check-in");
        Hourdvr = i.getExtras().getInt("Hourdvr");
        Minutedvr = i.getExtras().getInt("Minutedvr");
        status = i.getExtras().getInt("status");
        dvrScheduleToWork = i.getExtras().getString("dvrScheduleToWork");
        dvrStartTime = i.getExtras().getString("dvrStartTime");
        jobs_assigned = i.getExtras().getString("jobs_assigned");
    }

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

        // getting JSON string from URL
        JSONObject json = JSONfunction.getJSONfromURL("http://www.jetdelivery.com/mobile/api/getresourcestatus/?type=json&uid=" + (username) + "&pwd=" + (password));

        try {
            // Getting Array of Contacts
            JOBS = json.getJSONArray(jobs);

            // looping through All Contacts
            for (int i1 = 0; i1 < JOBS.length(); i1++) {
                JSONObject c = JOBS.getJSONObject(i1);

                // Storing each json item in variable
                JOB = c.getString(job);
                PAYS = c.getString(pays);
                READY_AT = c.getString(ready_at);
                DUE_BY = c.getString(due_by);
                DELIVER_PHONE = c.getString(deliver_phone);
                PIECES = c.getString(pieces);
                WEIGHT = c.getString(weight);
                PICKUP_NAME = c.getString(pickup_name);
                PICKUP_ADDR1 = c.getString(pickup_addr1);
                PICKUP_CITY = c.getString(pickup_city);
                PICKUP_STATE = c.getString(pickup_state);
                PICKUP_ZIP_POSTAL = c.getString(pickup_zip_postal);
                DELIVER_NAME = c.getString(deliver_name);
                DELIVER_ADDR1 = c.getString(deliver_addr1);
                DELIVER_CITY = c.getString(deliver_city);
                DELIVER_STATE = c.getString(deliver_state);
                DELIVER_ZIP_POSTAL = c.getString(deliver_zip_postal);
                SIGNATURE_REQUIRED = c.getString(signature_required);
                PICKUP_TO_SEE = c.getString(pickup_to_see);
                PICKUP_ROOM = c.getString(pickup_room);
                PICKUP_PHONE = c.getString(pickup_phone);
                DELIVER_TO_SEE = c.getString(deliver_to_see);
                DELIVER_ROOM = c.getString(deliver_room);
                PICKUP_SPECIAL_INSTR = c.getString(pickup_special_instr);
                DELIVER_SPECIAL_INSTR = c.getString(deliver_special_instr);
                CUSTOMER_REFERENCE = c.getString(customer_reference);

                // creating new HashMap
                HashMap<String, String> map = new HashMap<String, String>();

                // adding each child node to HashMap key => value
                map.put(job, JOB);
                map.put(pays, PAYS);
                map.put(ready_at, READY_AT);
                // map.put(weight, mobile);

                // adding HashList to ArrayList
                contactList.add(map);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);

        WindowManager.LayoutParams params = getWindow().getAttributes();
        Jobs.this.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
        params.x = 0;
        params.height = 520;
        params.width = 480;
        params.y = 200;
        params.dimAmount = .70f;
        Jobs.this.getWindow().setAttributes(params);

        /** Updating parsed JSON data into ListView */
        ListAdapter adapter = new SimpleAdapter(Jobs.this, contactList, R.layout.list_item, new String[] { job, pays, ready_at }, new int[] { R.id.job1, R.id.pays1, R.id.ready_at1 });
        setListAdapter(adapter);

        VerifyDriver.dismiss();

    }
}

@Override
protected void onResume() {
    super.onResume();
    Jobs.this.overridePendingTransition(R.anim.fadein, R.anim.fadeout);
}

@Override
protected void onPause() {
    super.onPause();
    Jobs.this.overridePendingTransition(R.anim.fadein, R.anim.fadeout);

}

@Override
public void onBackPressed() {
    vib.vibrate(40);

    // Send username and password strings into screen1 class
    Intent i = new Intent(Jobs.this, screen1.class);
    i.putExtra("uid", username);
    i.putExtra("pwd", password);
    i.putExtra("Minute", Minute);
    i.putExtra("Hour", Hour);
    i.putExtra("firstName", firstName);
    i.putExtra("lastName", lastName);
    i.putExtra("check-in", dvrcheckin);
    i.putExtra("Hourdvr", Hourdvr);
    i.putExtra("Minutedvr", Minutedvr);
    i.putExtra("status", status);
    i.putExtra("lastLatitudeUpdate", lastLatitudeUpdate);
    i.putExtra("dvrScheduleToWork", dvrScheduleToWork);
    i.putExtra("dvrStartTime", dvrStartTime);
    i.putExtra("jobs_assigned", jobs_assigned);
    Jobs.this.finish();
    startActivity(i);
    Jobs.this.overridePendingTransition(R.anim.fadein, R.anim.fadeout);

}

@Override
protected void onRestart() {
    super.onRestart();
    Intent i = new Intent(this, AgentPortalActivity.class);
    startActivity(i);
    Jobs.this.overridePendingTransition(R.anim.fadein, R.anim.fadeout);

}
}

---

您的

侦听器似乎有问题。您输入的意图将发送到显示您的信息的活动（
SingleMenuItemActivity
）。在
onItemClick（）
方法中，一个位置被传递给它。该位置是用户在ListView中选择的索引。您似乎只是在传递字符串中存储的任何值。
问题是，您发送到intent的字符串（作业、工资、就绪时间、到期时间等）被设置为最后一个，因为这是创建的最后一个视图。试一试

Object j = lv.getAdapter().getItem(position);

（其中object是项的任何数据类型）并从中获取字符串值

编辑：更详细的细分

在进一步检查代码之后，我看到了一个易于实现的解决方案。在doInBackground方法中，将每个字符串设置为从JSONArray获得的任何字符串。由于您通过intent发送这些字符串，因此最终将得到下载和映射的最后一个作业。我的建议是：将JSONArray作业声明为JOBS类中的字段变量。在这里，内部异步类和整个Jobs类都可以访问它。现在，将您的侦听器更改为：

lv.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view,
            int position, long ide) {

        vib.vibrate(40);

        // Starting new intent
        try {
        Intent in = new Intent(getApplicationContext(),
                SingleMenuItemActivity.class);
        in.putExtra("jobInfo", JOBS.getJSONObject(position).toString());

        startActivity(in);
        Jobs.this.overridePendingTransition(R.anim.fadein, R.anim.fadeout);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
});

现在，您可以使用JSONObject方法直接访问数据，而不是从intent获取数据并将其存储在字符串变量中，然后使用这些字符串变量设置文本视图（顺便说一句，无论您如何操作，都可以省略整个字符串变量步骤）

myTextView.setText(intent.getStringExtra("nameOfString"))

比如，在您的代码中，它将是：

trackno.setText(in.getStringExtra(job)). 

而不是将字符串赋给变量，然后用变量设置它。这样可以减少内存使用和中间人的额外成本。）

这应该可以解决你的问题。
我能问一下，为什么你要发送20多个额外的
而不是作为一个对象传递它们吗？我对开发应用程序的知识仍然非常有限。我正在学习到的东西。你应该看看
Parcelable
界面。这将允许您传递
对象
，而不必单独传递每个属性。这里有一个链接可以帮助你：你能帮我把它再细分一点吗？这里有一些我会做的来解决你的问题，还有一些关于编码技巧的建议。我很抱歉花了一段时间才回复你。没有必要道歉，尤其是当你是帮助我的人的时候。我试过你的建议，“intent.getString（“nameOfString”）”，但是字符串总是乱七八糟地返回给我（它在屏幕上显示未分析的数据）哦，等等，我有个错误。对不起，修好了。您仍然在向intent传递单个字符串，还是在传递JSON字符串？我现在只传递JSON字符串，已经放弃了intent。因此，到目前为止，我所做的是1）让我的JSONArray工作；全球可访问。2） 通过传入“jobInfo”JSONObject并在接收端获取JSONObject，做出了一个新的意图。3） 将文本视图设置为in.getStringExtra（READY_AT））等。。。我很快就会发布日志。谢谢你帮我解决了斯库达！你能解释一下我该如何着手解决这个问题吗？我尝试了skUDA的建议，但我认为还缺少一些步骤。
myJsonJob = new JSONObject(getIntent().getStringExtra("jobInfo"));

myTextView.setText(intent.getStringExtra("nameOfString"))

trackno.setText(in.getStringExtra(job)).