Android 从模型中获取数据的侦听器

我是Android开发的新手，我正在尝试构建一个ListView，它使用gson从web服务获取数据。我有一个模型类、一个列表类、一个适配器类和一个活动类

列表工作正常，它得到了数据，现在我想将侦听器集成到列表中，并将数据传递给第二个活动。我想获取项目id（DistrictId）并将其传递给下一个活动（listView），而不是行id。如果有人能给我指示灯，那就太好了。。。因为文档不太清楚，而且我是新来的

下面是我的代码

模型类

package com.sample.myapp;

public class DistrictModel {
private String id;
private String districtName;

public String getDistrictId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}
public String getDistrictName(){
    return districtName;
}
public void setDistrictEN(String districtName){
    this.districtName = districtName;
}
}

public class DistrictList {
private List<DistrictModel> districts;

public List<DistrictModel> getDistricts(){
    return districts;
}
public void setDistrictList(List<DistrictModel> districts){
    this.districts = districts;
}
} 

public class DistrictAdapter extends ArrayAdapter<DistrictModel>{
int resource;
String response;
Context context;
private LayoutInflater dInflater;

public DistrictAdapter(Context context, int resource, List<DistrictModel> objects) {
        super(context, resource, objects);
        this.resource = resource;
        dInflater = LayoutInflater.from(context);
}

static class ViewHolder {
    TextView title;
}
public View getView(int position, View convertView, ViewGroup parent)
{
    ViewHolder holder;
    //Get the current location object
    DistrictModel lm = (DistrictModel) getItem(position);

    //Inflate the view
    if(convertView==null)
    {
        convertView = dInflater.inflate(R.layout.item_district, null);
        holder = new ViewHolder();
        holder.title = (TextView) convertView
                .findViewById(R.id.district_name);

        convertView.setTag(holder);
    }
    else
    {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.title.setText(lm.getDistrictName());

    return convertView;
}
}

public class DistrictListActivity extends Activity{
LocationManager lm;

ArrayList<DistrictModel> districtArray = null;
DistrictAdapter districtAdapter;
DistrictList list;

ListView lv;

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.districtlist_layout);

    lv = (ListView) findViewById(R.id.list_district);

    districtArray = new ArrayList<DistrictModel>();
    districtAdapter = new DistrictAdapter(DistrictListActivity.this, R.layout.item_district, districtArray);

    lv.setTextFilterEnabled(true);
            lv.setAdapter(districtAdapter);

            try {
                new DistrictSync().execute("http://aws.something.com/service");
            } catch(Exception e) {}

    lv.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View convertView, int position, long id) {
                AlertDialog.Builder adb=new AlertDialog.Builder(DistrictListActivity.this);
                adb.setTitle("LVSelectedItemExample");
                adb.setMessage("Selected Item is = "+(lv.getItemIdAtPosition(position)));
                adb.setPositiveButton("Ok", null);
                adb.show();

                }
        }); **//i'd like to get the DistrictId from the json data.**
}



private class DistrictSync extends AsyncTask<String, Integer, DistrictList> {

    protected DistrictList doInBackground(String... urls) {
        DistrictList list = null;
        int count = urls.length;

        for (int i = 0; i < count; i++) {
            try {           
                // ntar diganti service
                RestClient client = new RestClient(urls[i]);

                try {
                    client.Execute(RequestMethod.GET);
                } catch (Exception e) {
                    e.printStackTrace();
                }

                String json = client.getResponse();

                list = new Gson().fromJson(json, DistrictList.class);

                //
            } catch(Exception e) {}
        }
        return list;
    }

    protected void onProgressUpdate(Integer... progress) {

    }

    protected void onPostExecute(DistrictList dislist) {

        for(DistrictModel lm : dislist.getDistricts())
        {
            districtArray.add(lm);
        }
        districtAdapter.notifyDataSetChanged();
    }

}
}

列表类

package com.sample.myapp;

public class DistrictModel {
private String id;
private String districtName;

public String getDistrictId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}
public String getDistrictName(){
    return districtName;
}
public void setDistrictEN(String districtName){
    this.districtName = districtName;
}
}

public class DistrictList {
private List<DistrictModel> districts;

public List<DistrictModel> getDistricts(){
    return districts;
}
public void setDistrictList(List<DistrictModel> districts){
    this.districts = districts;
}
} 

public class DistrictAdapter extends ArrayAdapter<DistrictModel>{
int resource;
String response;
Context context;
private LayoutInflater dInflater;

public DistrictAdapter(Context context, int resource, List<DistrictModel> objects) {
        super(context, resource, objects);
        this.resource = resource;
        dInflater = LayoutInflater.from(context);
}

static class ViewHolder {
    TextView title;
}
public View getView(int position, View convertView, ViewGroup parent)
{
    ViewHolder holder;
    //Get the current location object
    DistrictModel lm = (DistrictModel) getItem(position);

    //Inflate the view
    if(convertView==null)
    {
        convertView = dInflater.inflate(R.layout.item_district, null);
        holder = new ViewHolder();
        holder.title = (TextView) convertView
                .findViewById(R.id.district_name);

        convertView.setTag(holder);
    }
    else
    {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.title.setText(lm.getDistrictName());

    return convertView;
}
}

public class DistrictListActivity extends Activity{
LocationManager lm;

ArrayList<DistrictModel> districtArray = null;
DistrictAdapter districtAdapter;
DistrictList list;

ListView lv;

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.districtlist_layout);

    lv = (ListView) findViewById(R.id.list_district);

    districtArray = new ArrayList<DistrictModel>();
    districtAdapter = new DistrictAdapter(DistrictListActivity.this, R.layout.item_district, districtArray);

    lv.setTextFilterEnabled(true);
            lv.setAdapter(districtAdapter);

            try {
                new DistrictSync().execute("http://aws.something.com/service");
            } catch(Exception e) {}

    lv.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View convertView, int position, long id) {
                AlertDialog.Builder adb=new AlertDialog.Builder(DistrictListActivity.this);
                adb.setTitle("LVSelectedItemExample");
                adb.setMessage("Selected Item is = "+(lv.getItemIdAtPosition(position)));
                adb.setPositiveButton("Ok", null);
                adb.show();

                }
        }); **//i'd like to get the DistrictId from the json data.**
}



private class DistrictSync extends AsyncTask<String, Integer, DistrictList> {

    protected DistrictList doInBackground(String... urls) {
        DistrictList list = null;
        int count = urls.length;

        for (int i = 0; i < count; i++) {
            try {           
                // ntar diganti service
                RestClient client = new RestClient(urls[i]);

                try {
                    client.Execute(RequestMethod.GET);
                } catch (Exception e) {
                    e.printStackTrace();
                }

                String json = client.getResponse();

                list = new Gson().fromJson(json, DistrictList.class);

                //
            } catch(Exception e) {}
        }
        return list;
    }

    protected void onProgressUpdate(Integer... progress) {

    }

    protected void onPostExecute(DistrictList dislist) {

        for(DistrictModel lm : dislist.getDistricts())
        {
            districtArray.add(lm);
        }
        districtAdapter.notifyDataSetChanged();
    }

}
}

公共类分区列表{
私人名单地区；
公众地区名单（{
返回区；
}
公共区域列表（列表区域）{
这个。地区=地区；
}
} 

适配器类

package com.sample.myapp;

public class DistrictModel {
private String id;
private String districtName;

public String getDistrictId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}
public String getDistrictName(){
    return districtName;
}
public void setDistrictEN(String districtName){
    this.districtName = districtName;
}
}

public class DistrictList {
private List<DistrictModel> districts;

public List<DistrictModel> getDistricts(){
    return districts;
}
public void setDistrictList(List<DistrictModel> districts){
    this.districts = districts;
}
} 

public class DistrictAdapter extends ArrayAdapter<DistrictModel>{
int resource;
String response;
Context context;
private LayoutInflater dInflater;

public DistrictAdapter(Context context, int resource, List<DistrictModel> objects) {
        super(context, resource, objects);
        this.resource = resource;
        dInflater = LayoutInflater.from(context);
}

static class ViewHolder {
    TextView title;
}
public View getView(int position, View convertView, ViewGroup parent)
{
    ViewHolder holder;
    //Get the current location object
    DistrictModel lm = (DistrictModel) getItem(position);

    //Inflate the view
    if(convertView==null)
    {
        convertView = dInflater.inflate(R.layout.item_district, null);
        holder = new ViewHolder();
        holder.title = (TextView) convertView
                .findViewById(R.id.district_name);

        convertView.setTag(holder);
    }
    else
    {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.title.setText(lm.getDistrictName());

    return convertView;
}
}

public class DistrictListActivity extends Activity{
LocationManager lm;

ArrayList<DistrictModel> districtArray = null;
DistrictAdapter districtAdapter;
DistrictList list;

ListView lv;

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.districtlist_layout);

    lv = (ListView) findViewById(R.id.list_district);

    districtArray = new ArrayList<DistrictModel>();
    districtAdapter = new DistrictAdapter(DistrictListActivity.this, R.layout.item_district, districtArray);

    lv.setTextFilterEnabled(true);
            lv.setAdapter(districtAdapter);

            try {
                new DistrictSync().execute("http://aws.something.com/service");
            } catch(Exception e) {}

    lv.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View convertView, int position, long id) {
                AlertDialog.Builder adb=new AlertDialog.Builder(DistrictListActivity.this);
                adb.setTitle("LVSelectedItemExample");
                adb.setMessage("Selected Item is = "+(lv.getItemIdAtPosition(position)));
                adb.setPositiveButton("Ok", null);
                adb.show();

                }
        }); **//i'd like to get the DistrictId from the json data.**
}



private class DistrictSync extends AsyncTask<String, Integer, DistrictList> {

    protected DistrictList doInBackground(String... urls) {
        DistrictList list = null;
        int count = urls.length;

        for (int i = 0; i < count; i++) {
            try {           
                // ntar diganti service
                RestClient client = new RestClient(urls[i]);

                try {
                    client.Execute(RequestMethod.GET);
                } catch (Exception e) {
                    e.printStackTrace();
                }

                String json = client.getResponse();

                list = new Gson().fromJson(json, DistrictList.class);

                //
            } catch(Exception e) {}
        }
        return list;
    }

    protected void onProgressUpdate(Integer... progress) {

    }

    protected void onPostExecute(DistrictList dislist) {

        for(DistrictModel lm : dislist.getDistricts())
        {
            districtArray.add(lm);
        }
        districtAdapter.notifyDataSetChanged();
    }

}
}

公共类DistrictAdapter扩展了ArrayAdapter{
智力资源；
字符串响应；
语境；
私人公寓；
公共分区适配器（上下文、int资源、列表对象）{
超级（上下文、资源、对象）；
这个资源=资源；
dInflater=LayoutInflater.from（上下文）；
}
静态类视窗夹{
文本视图标题；
}
公共视图getView（int位置、视图转换视图、视图组父视图）
{
视窗座；
//获取当前位置对象
DistrictModel lm=（DistrictModel）getItem（位置）；
//夸大观点
if（convertView==null）
{
convertView=充气机充气（R.layout.item_district，空）；
holder=新的ViewHolder（）；
holder.title=（TextView）convertView
.findViewById（R.id.地区名称）；
convertView.setTag（支架）；
}
其他的
{
holder=（ViewHolder）convertView.getTag（）；
}
holder.title.setText（lm.getDistrictName（））；
返回视图；
}
}

活动类

package com.sample.myapp;

public class DistrictModel {
private String id;
private String districtName;

public String getDistrictId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}
public String getDistrictName(){
    return districtName;
}
public void setDistrictEN(String districtName){
    this.districtName = districtName;
}
}

public class DistrictList {
private List<DistrictModel> districts;

public List<DistrictModel> getDistricts(){
    return districts;
}
public void setDistrictList(List<DistrictModel> districts){
    this.districts = districts;
}
} 

public class DistrictAdapter extends ArrayAdapter<DistrictModel>{
int resource;
String response;
Context context;
private LayoutInflater dInflater;

public DistrictAdapter(Context context, int resource, List<DistrictModel> objects) {
        super(context, resource, objects);
        this.resource = resource;
        dInflater = LayoutInflater.from(context);
}

static class ViewHolder {
    TextView title;
}
public View getView(int position, View convertView, ViewGroup parent)
{
    ViewHolder holder;
    //Get the current location object
    DistrictModel lm = (DistrictModel) getItem(position);

    //Inflate the view
    if(convertView==null)
    {
        convertView = dInflater.inflate(R.layout.item_district, null);
        holder = new ViewHolder();
        holder.title = (TextView) convertView
                .findViewById(R.id.district_name);

        convertView.setTag(holder);
    }
    else
    {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.title.setText(lm.getDistrictName());

    return convertView;
}
}

public class DistrictListActivity extends Activity{
LocationManager lm;

ArrayList<DistrictModel> districtArray = null;
DistrictAdapter districtAdapter;
DistrictList list;

ListView lv;

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.districtlist_layout);

    lv = (ListView) findViewById(R.id.list_district);

    districtArray = new ArrayList<DistrictModel>();
    districtAdapter = new DistrictAdapter(DistrictListActivity.this, R.layout.item_district, districtArray);

    lv.setTextFilterEnabled(true);
            lv.setAdapter(districtAdapter);

            try {
                new DistrictSync().execute("http://aws.something.com/service");
            } catch(Exception e) {}

    lv.setOnItemClickListener(new OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View convertView, int position, long id) {
                AlertDialog.Builder adb=new AlertDialog.Builder(DistrictListActivity.this);
                adb.setTitle("LVSelectedItemExample");
                adb.setMessage("Selected Item is = "+(lv.getItemIdAtPosition(position)));
                adb.setPositiveButton("Ok", null);
                adb.show();

                }
        }); **//i'd like to get the DistrictId from the json data.**
}



private class DistrictSync extends AsyncTask<String, Integer, DistrictList> {

    protected DistrictList doInBackground(String... urls) {
        DistrictList list = null;
        int count = urls.length;

        for (int i = 0; i < count; i++) {
            try {           
                // ntar diganti service
                RestClient client = new RestClient(urls[i]);

                try {
                    client.Execute(RequestMethod.GET);
                } catch (Exception e) {
                    e.printStackTrace();
                }

                String json = client.getResponse();

                list = new Gson().fromJson(json, DistrictList.class);

                //
            } catch(Exception e) {}
        }
        return list;
    }

    protected void onProgressUpdate(Integer... progress) {

    }

    protected void onPostExecute(DistrictList dislist) {

        for(DistrictModel lm : dislist.getDistricts())
        {
            districtArray.add(lm);
        }
        districtAdapter.notifyDataSetChanged();
    }

}
}

公共类DistrictListActivity扩展活动{
位置经理lm；
ArrayList districtArray=null；
DistrictAdapter DistrictAdapter；
地区名单；
ListView lv；
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.districtlist_布局）；
lv=（ListView）findViewById（R.id.list\U区）；
districtArray=新的ArrayList（）；
districtAdapter=新districtAdapter（DistrictListActivity.this，R.layout.item\u district，districtArray）；
lv.setTextFilterEnabled（真）；
低压设置适配器（分区适配器）；
试一试{
新建DistrictSync（）。执行（“http://aws.something.com/service");
}捕获（例外e）{}
lv.setOnItemClickListener（新的OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父级、视图转换视图、整型位置、长id）{
AlertDialog.Builder adb=新建AlertDialog.Builder（DistrictListActivity.this）；
adb.setTitle（“LVSelectedItemExample”）；
adb.setMessage（“所选项目为=”+（lv.getItemIdAtPosition（position））；
adb.setPositiveButton（“确定”，空）；
adb.show（）；
}
})；**//我想从json数据中获取DistrictId**
}
私有类DistrictSync扩展异步任务{
受保护的DistrictList doInBackground（字符串…URL）{
DistrictList=null；
int count=url.length；
for（int i=0；i

出于测试目的，现在我单击该行，它将显示行id，因此我知道onclick侦听器可以工作，但我只希望它获取DistrictId，以便我可以使用它传递到下一个活动

---

非常感谢。

通常，当您想将数据从一个

活动

传递到另一个

活动时，只需将其放入用于创建新
活动的
意图

例如（和）：

要检索数据，请执行以下操作：

Bundle extras = getIntent().getExtras();
if (extra != null) {
   ... // Do stuff with extras
}

（在我脑海中）试试这个：

((DistrictModel)lv.getAdapter().getItem(position)).getDistrictId();

你的回答也很有用，谢谢。。。因为在通过意图之前我必须解决第一部分，所以我必须选择彼得给出的答案。但我真的很感谢。但是，我该如何有目的地将此传递给另一个活动呢？