无法看到ListView
我没有在listView中看到任何数据我从Web服务获取所有数据，但我没有在ListView中看到它。 我得到了流量，我明白它永远不会进入getView（）方法 请解释我在该代码中出现的错误，并建议我最好的一个。
public class WeatherReport extends Activity {
ListView listView;
GPS_Location gpsObj;
BaseAdapter aAdapter;
double Latitude, Longitude;
Bitmap image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.weather_report);
listView = (ListView) findViewById(R.id.listView);
gpsObj = new GPS_Location(this);
Latitude = gpsObj.getLatitude();
Longitude = gpsObj.getLongitude();
System.out.println("Inside onCreate() ");
String Url = "http://api.openweathermap.org/data/2.5/forecast/daily?lat=" + Latitude + "&lon=" + Longitude + "&cnt=14&mode=json";
new getJSON().execute(Url);
// listView.setAdapter(new BAdapter(this));
}
private class getJSON extends AsyncTask<String, String, String> {
String cityName;
String Latitude, Longitude;
ArrayList<SingleRow> list;
ArrayList<String> humidity;
ArrayList<String> speed;
ArrayList<String> weather;
ArrayList<String> tempMin;
ArrayList<String> tempMax;
ArrayList<String> description;
ArrayList<Bitmap> icon;
@Override
protected String doInBackground(String... params) {
String Url = params[0];
humidity = new ArrayList<String>();
speed = new ArrayList<String>();
weather = new ArrayList<String>();
tempMin = new ArrayList<String>();
tempMax = new ArrayList<String>();
icon = new ArrayList<Bitmap>();
description = new ArrayList<String>();
String data;
try {
HttpClient hClient = new DefaultHttpClient();
HttpGet hGet = new HttpGet(Url);
ResponseHandler<String> rHandler = new BasicResponseHandler();
data = hClient.execute(hGet, rHandler);
System.out.println("Inside doInBackground data " + data);
JSONObject jObj = new JSONObject(data);
System.out.println("Inside Background jObj " + jObj);
JSONObject jsonObject = jObj.getJSONObject("city");
cityName = jsonObject.getString("name");
JSONObject jObjCoOrd = jsonObject.getJSONObject("coord");
Latitude = jObjCoOrd.getString("lat");
System.out.println("Inside Latitude " + Latitude);
Longitude = jObjCoOrd.getString("lon");
System.out.println("Inside Longitude " + Longitude);
JSONArray jsonArray = jObj.getJSONArray("list");
System.out.println("Inside jsonObjList " + jsonArray);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
String humidityString = object.getString("humidity");
humidity.add(humidityString);
String speedString = object.getString("speed");
System.out.println("Inside speedString " + speedString);
speed.add(speedString);
JSONArray weatherArray = object.getJSONArray("weather");
JSONObject weatherObj = weatherArray.getJSONObject(0);
String iconString = weatherObj.getString("icon");
final String iconURL = "http://openweathermap.org/img/w/" + iconString + ".png";
image = getImage(iconURL);
icon.add(image);
System.out.println("Inside icon " + icon);
String descriptionString = weatherObj.getString("description");
System.out.println("Inside descriptionString " + descriptionString);
description.add(descriptionString);
JSONObject tempObj = object.getJSONObject("temp");
String minTemp = tempObj.getString("min");
System.out.println("Inside minTemp " + minTemp);
tempMin.add(minTemp);
String maxTemp = tempObj.getString("max");
System.out.println("Inside maxTemp " + maxTemp);
tempMax.add(maxTemp);
}
aAdapter = new ListViewCustomAdapter(WeatherReport.this,
Latitude, Longitude, cityName, humidity, speed, icon, description, tempMin, tempMax);
listView.setAdapter(aAdapter);
} catch (Exception e) {
Log.w("Error", e.getMessage());
}
return null;
}
private Bitmap getImage(String iconURL) {
InputStream in = null;
Bitmap bmp = null;
int responseCode = -1;
try {
URL url = new URL(iconURL);//"http://192.xx.xx.xx/mypath/img1.jpg
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setDoInput(true);
con.connect();
responseCode = con.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
//download
in = con.getInputStream();
bmp = BitmapFactory.decodeStream(in);
in.close();
}
} catch (Exception ex) {
Log.e("Exception", ex.toString());
}
return bmp;
}
private class ListViewCustomAdapter extends BaseAdapter {
Context context;
public LayoutInflater inflater;
String Latitude, Longitude, cityName;
String[] Humidity, Speed, Description1, minTemp, maxTemp ;
ArrayList<Bitmap> bitmap;
public ListViewCustomAdapter(Context context, String latitude, String longitude, String cityName, ArrayList<String> humidity, ArrayList<String> speed, ArrayList<Bitmap> image, ArrayList<String> description, ArrayList<String> tempMin, ArrayList<String> tempMax) {
this.context = context;
this.Latitude = latitude;
this.Longitude = longitude;
this.cityName = cityName;
this.bitmap = icon;
this.Humidity = humidity.toArray(new String[humidity.size()]);
this.Speed = speed.toArray(new String[speed.size()]);
this.Description1 = description.toArray(new String[description.size()]);
this.minTemp = tempMin.toArray(new String[tempMin.size()]);
this.maxTemp = tempMax.toArray(new String[tempMax.size()]);
this.inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
System.out.println("Inside ListViewCustomAdapter ");
}
@Override
public int getCount() {
return 0;
}
@Override
public Object getItem(int i) {
return i;
}
@Override
public long getItemId(int i) {
return i;
}
private class Holder {
TextView City, MinTemp, MaxTemp, Description, Speed, Latitude, Longitude, Humidity;
ImageView cloud;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder= null;
View view = convertView;
System.out.println("Inside getView");
if(view== null){
System.out.println("Inside if getView");
holder = new Holder();
convertView = inflater.inflate(R.layout.weather_report_single_item, null);
holder.cloud = (ImageView) findViewById(R.id.cloud);
holder.City = (TextView) findViewById(R.id.cityName);
holder.MinTemp= (TextView) findViewById(R.id.minTemp);
holder.MaxTemp= (TextView) findViewById(R.id.maxTemp);
holder.Description=(TextView) findViewById(R.id.weather);
holder.Speed =(TextView) findViewById(R.id.speed);
holder.Latitude = (TextView) findViewById(R.id.latitude);
holder.Longitude= (TextView) findViewById(R.id.longitude);
holder.Humidity= (TextView) findViewById(R.id.humidity);
convertView.setTag(holder);
}else{
System.out.println("Inside else getView");
holder = (Holder) convertView.getTag();
holder.City.setText(cityName);
holder.Latitude.setText(Latitude);
holder.Longitude.setText(Longitude);
holder.MaxTemp.setText(maxTemp[position]);
holder.MinTemp.setText(minTemp[position]);
holder.Speed.setText(Speed[position]);
holder.Description.setText(Description1[position]);
holder.cloud.setImageBitmap(bitmap.get(position));
}
return convertView;
}
}
}
}
class SingleRow {
String minTemp, maxTemp, speed, humidity;
Bitmap img;
SingleRow(String minTemp, String maxTemp, String speed, String humidity, Bitmap img) {
this.maxTemp = maxTemp;
this.minTemp = minTemp;
this.speed = speed;
this.humidity = humidity;
this.img = img;
}
}
4 个答案:
答案 0 :(得分：1)
已编辑
首先 写
@Override
public int getCount() {
return Humidity.length();;
}
而不是
@Override
public int getCount() {
return 0;
}
您正在getview（）的其他部分设置值中为行视图设置值if else
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder= null;
View view = convertView;
System.out.println("Inside getView");
if(view== null){
System.out.println("Inside if getView");
holder = new Holder();
convertView = inflater.inflate(R.layout.weather_report_single_item, null);
holder.cloud = (ImageView) findViewById(R.id.cloud);
convertView.setTag(holder);
}else{
System.out.println("Inside else getView");
holder = (Holder) convertView.getTag();
}
holder.City.setText(cityName);
holder.Latitude.setText(Latitude);
holder.Longitude.setText(Longitude);
holder.MaxTemp.setText(maxTemp[position]);
holder.MinTemp.setText(minTemp[position]);
holder.Speed.setText(Speed[position]);
holder.Description.setText(Description1[position]);
holder.cloud.setImageBitmap(bitmap.get(position));
return convertView;
}
答案 1 :(得分：0)
您在基础适配器中的getCount（）返回0将其更改为您有这样的数据的总大小
@Override
public int getCount() {
return Humidity.length;
}
并且还要改变
aAdapter = new ListViewCustomAdapter(WeatherReport.this,
Latitude, Longitude, cityName, humidity, speed, icon, description, tempMin, tempMax);
listView.setAdapter(aAdapter);
从 doInBackground 到 onPostExecute 在异步任务类中的方法
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
aAdapter = new ListViewCustomAdapter(WeatherReport.this,
Latitude, Longitude, cityName, humidity, speed, icon, description, tempMin, tempMax);
listView.setAdapter(aAdapter);
}
完整的代码看起来像这样
public class WeatherReport extends Activity {
ListView listView;
GPS_Location gpsObj;
BaseAdapter aAdapter;
double Latitude, Longitude;
Bitmap image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.weather_report);
listView = (ListView) findViewById(R.id.listView);
gpsObj = new GPS_Location(this);
Latitude = gpsObj.getLatitude();
Longitude = gpsObj.getLongitude();
System.out.println("Inside onCreate() ");
String Url = "http://api.openweathermap.org/data/2.5/forecast/daily?lat=" + Latitude + "&lon=" + Longitude + "&cnt=14&mode=json";
new getJSON().execute(Url);
// listView.setAdapter(new BAdapter(this));
}
private class getJSON extends AsyncTask<String, String, String> {
String cityName;
String Latitude, Longitude;
ArrayList<SingleRow> list;
ArrayList<String> humidity;
ArrayList<String> speed;
ArrayList<String> weather;
ArrayList<String> tempMin;
ArrayList<String> tempMax;
ArrayList<String> description;
ArrayList<Bitmap> icon;
@Override
protected String doInBackground(String... params) {
String Url = params[0];
humidity = new ArrayList<String>();
speed = new ArrayList<String>();
weather = new ArrayList<String>();
tempMin = new ArrayList<String>();
tempMax = new ArrayList<String>();
icon = new ArrayList<Bitmap>();
description = new ArrayList<String>();
String data;
try {
HttpClient hClient = new DefaultHttpClient();
HttpGet hGet = new HttpGet(Url);
ResponseHandler<String> rHandler = new BasicResponseHandler();
data = hClient.execute(hGet, rHandler);
System.out.println("Inside doInBackground data " + data);
JSONObject jObj = new JSONObject(data);
System.out.println("Inside Background jObj " + jObj);
JSONObject jsonObject = jObj.getJSONObject("city");
cityName = jsonObject.getString("name");
JSONObject jObjCoOrd = jsonObject.getJSONObject("coord");
Latitude = jObjCoOrd.getString("lat");
System.out.println("Inside Latitude " + Latitude);
Longitude = jObjCoOrd.getString("lon");
System.out.println("Inside Longitude " + Longitude);
JSONArray jsonArray = jObj.getJSONArray("list");
System.out.println("Inside jsonObjList " + jsonArray);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
String humidityString = object.getString("humidity");
humidity.add(humidityString);
String speedString = object.getString("speed");
System.out.println("Inside speedString " + speedString);
speed.add(speedString);
JSONArray weatherArray = object.getJSONArray("weather");
JSONObject weatherObj = weatherArray.getJSONObject(0);
String iconString = weatherObj.getString("icon");
final String iconURL = "http://openweathermap.org/img/w/" + iconString + ".png";
image = getImage(iconURL);
icon.add(image);
System.out.println("Inside icon " + icon);
String descriptionString = weatherObj.getString("description");
System.out.println("Inside descriptionString " + descriptionString);
description.add(descriptionString);
JSONObject tempObj = object.getJSONObject("temp");
String minTemp = tempObj.getString("min");
System.out.println("Inside minTemp " + minTemp);
tempMin.add(minTemp);
String maxTemp = tempObj.getString("max");
System.out.println("Inside maxTemp " + maxTemp);
tempMax.add(maxTemp);
}
//Removed Setting Adaptor from do in background to onPostExecute
} catch (Exception e) {
Log.w("Error", e.getMessage());
}
return null;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
//The Last Step in Async Task Do set adaptor here
aAdapter = new ListViewCustomAdapter(WeatherReport.this,
Latitude, Longitude, cityName, humidity, speed, icon, description, tempMin, tempMax);
listView.setAdapter(aAdapter);
}
}
private Bitmap getImage(String iconURL) {
InputStream in = null;
Bitmap bmp = null;
int responseCode = -1;
try {
URL url = new URL(iconURL);//"http://192.xx.xx.xx/mypath/img1.jpg
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setDoInput(true);
con.connect();
responseCode = con.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
//download
in = con.getInputStream();
bmp = BitmapFactory.decodeStream(in);
in.close();
}
} catch (Exception ex) {
Log.e("Exception", ex.toString());
}
return bmp;
}
private class ListViewCustomAdapter extends BaseAdapter {
Context context;
public LayoutInflater inflater;
String Latitude, Longitude, cityName;
String[] Humidity, Speed, Description1, minTemp, maxTemp ;
ArrayList<Bitmap> bitmap;
public ListViewCustomAdapter(Context context, String latitude, String longitude, String cityName, ArrayList<String> humidity, ArrayList<String> speed, ArrayList<Bitmap> image, ArrayList<String> description, ArrayList<String> tempMin, ArrayList<String> tempMax) {
this.context = context;
this.Latitude = latitude;
this.Longitude = longitude;
this.cityName = cityName;
this.bitmap = icon;
this.Humidity = humidity.toArray(new String[humidity.size()]);
this.Speed = speed.toArray(new String[speed.size()]);
this.Description1 = description.toArray(new String[description.size()]);
this.minTemp = tempMin.toArray(new String[tempMin.size()]);
this.maxTemp = tempMax.toArray(new String[tempMax.size()]);
this.inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
System.out.println("Inside ListViewCustomAdapter ");
}
@Override
public int getCount() {
//Prev you have been returning 0 its changed from 0 to Humidity.length so that base adaptor show the result as listview
return Humidity.length;
}
@Override
public Object getItem(int i) {
return i;
}
@Override
public long getItemId(int i) {
return i;
}
private class Holder {
TextView City, MinTemp, MaxTemp, Description, Speed, Latitude, Longitude, Humidity;
ImageView cloud;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder= null;
View view = convertView;
System.out.println("Inside getView");
if(view== null){
System.out.println("Inside if getView");
holder = new Holder();
convertView = inflater.inflate(R.layout.weather_report_single_item, null);
holder.cloud = (ImageView) findViewById(R.id.cloud);
holder.City = (TextView) findViewById(R.id.cityName);
holder.MinTemp= (TextView) findViewById(R.id.minTemp);
holder.MaxTemp= (TextView) findViewById(R.id.maxTemp);
holder.Description=(TextView) findViewById(R.id.weather);
holder.Speed =(TextView) findViewById(R.id.speed);
holder.Latitude = (TextView) findViewById(R.id.latitude);
holder.Longitude= (TextView) findViewById(R.id.longitude);
holder.Humidity= (TextView) findViewById(R.id.humidity);
convertView.setTag(holder);
}else{
System.out.println("Inside else getView");
holder = (Holder) convertView.getTag();
holder.City.setText(cityName);
holder.Latitude.setText(Latitude);
holder.Longitude.setText(Longitude);
holder.MaxTemp.setText(maxTemp[position]);
holder.MinTemp.setText(minTemp[position]);
holder.Speed.setText(Speed[position]);
holder.Description.setText(Description1[position]);
holder.cloud.setImageBitmap(bitmap.get(position));
}
return convertView;
}
}
class SingleRow {
String minTemp, maxTemp, speed, humidity;
Bitmap img;
SingleRow(String minTemp, String maxTemp, String speed, String humidity, Bitmap img) {
this.maxTemp = maxTemp;
this.minTemp = minTemp;
this.speed = speed;
this.humidity = humidity;
this.img = img;
}
}
}
答案 2 :(得分：0)
给出要显示的记录的长度..在get count方法中给出数组/集合长度
检查以下代码以获取适配器。还添加了评论，你也犯了错误和建议
设置listview适配器和所有异步任务onPostExecute方法。
<强> EDITED
检查我用#### SUGGESTION
public class WeatherReport extends Activity {
ListView listView;
// GPS_Location gpsObj;
// BaseAdapter aAdapter;
double Latitude, Longitude;
Bitmap image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_);
listView = (ListView) findViewById(R.id.listdata);
// gpsObj = new GPS_Location(this);
/*
* For testing i gve static lat long values as i dnt hve your
* GPS_Location class
*/
Latitude = 23;
Longitude = 73;
System.out.println("Inside onCreate() ");
String Url = "http://api.openweathermap.org/data/2.5/forecast/daily?lat="
+ Latitude + "&lon=" + Longitude + "&cnt=14&mode=json";
new getJSON().execute(Url);
// listView.setAdapter(new BAdapter(this));
}
private class getJSON extends AsyncTask<String, String, String> {
String cityName;
String Latitude, Longitude;
ArrayList<SingleRow> list;
ArrayList<String> humidity;
ArrayList<String> speed;
ArrayList<String> weather;
ArrayList<String> tempMin;
ArrayList<String> tempMax;
ArrayList<String> description;
ArrayList<String> icon;
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
listView.setAdapter(new ListViewCustomAdapter(WeatherReport.this,
Latitude, Longitude, cityName, humidity, speed, icon,
description, tempMin, tempMax));
}
@Override
protected String doInBackground(String... params) {
String Url = params[0];
humidity = new ArrayList<String>();
speed = new ArrayList<String>();
weather = new ArrayList<String>();
tempMin = new ArrayList<String>();
tempMax = new ArrayList<String>();
icon = new ArrayList<String>();
description = new ArrayList<String>();
String data;
try {
HttpClient hClient = new DefaultHttpClient();
HttpGet hGet = new HttpGet(Url);
ResponseHandler<String> rHandler = new BasicResponseHandler();
data = hClient.execute(hGet, rHandler);
System.out.println("Inside doInBackground data " + data);
JSONObject jObj = new JSONObject(data);
System.out.println("Inside Background jObj " + jObj);
JSONObject jsonObject = jObj.getJSONObject("city");
cityName = jsonObject.getString("name");
JSONObject jObjCoOrd = jsonObject.getJSONObject("coord");
Latitude = jObjCoOrd.getString("lat");
System.out.println("Inside Latitude " + Latitude);
Longitude = jObjCoOrd.getString("lon");
System.out.println("Inside Longitude " + Longitude);
JSONArray jsonArray = jObj.getJSONArray("list");
System.out.println("Inside jsonObjList " + jsonArray);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
String humidityString = object.getString("humidity");
humidity.add(humidityString);
String speedString = object.getString("speed");
System.out.println("Inside speedString " + speedString);
speed.add(speedString);
JSONArray weatherArray = object.getJSONArray("weather");
JSONObject weatherObj = weatherArray.getJSONObject(0);
String iconString = weatherObj.getString("icon");
final String iconURL = "http://openweathermap.org/img/w/"
+ iconString + ".png";
// #### SUGGESTION
// Do not Download images or files like this
// to display images use imageloader lazy loading library is
// available
// https://github.com/nostra13/Android-Universal-Image-Loader/tree/master/sample
// Comment image downloading related below line and once
// check
// image = getImage(iconURL);
// icon.add(image);
// here other change i hve made is converty bitmap array
// list to String which will hve images url not bitmap
icon.add(iconURL);
System.out.println("Inside icon " + icon);
String descriptionString = weatherObj
.getString("description");
System.out.println("Inside descriptionString "
+ descriptionString);
description.add(descriptionString);
JSONObject tempObj = object.getJSONObject("temp");
String minTemp = tempObj.getString("min");
System.out.println("Inside minTemp " + minTemp);
tempMin.add(minTemp);
String maxTemp = tempObj.getString("max");
System.out.println("Inside maxTemp " + maxTemp);
tempMax.add(maxTemp);
}
// If u do any ui related changes here below exception will come
// so need to move ui changes in onPostExecute
// android.view.ViewRootImpl$CalledFromWrongThreadException:
// Only the original thread that created a view hierarchy can
// touch its views.
// listView.setAdapter(new ListViewCustomAdapter(
// WeatherReport.this, Latitude, Longitude, cityName,
// humidity, speed, icon, description, tempMin, tempMax));
} catch (Exception e) {
Log.w("Error", e.getMessage());
}
return null;
}
private Bitmap getImage(String iconURL) {
InputStream in = null;
Bitmap bmp = null;
int responseCode = -1;
try {
URL url = new URL(iconURL);// "http://192.xx.xx.xx/mypath/img1.jpg
HttpURLConnection con = (HttpURLConnection) url
.openConnection();
con.setDoInput(true);
con.connect();
responseCode = con.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
// download
in = con.getInputStream();
bmp = BitmapFactory.decodeStream(in);
in.close();
}
} catch (Exception ex) {
Log.e("Exception", ex.toString());
}
return bmp;
}
private class ListViewCustomAdapter extends BaseAdapter {
Context context;
public LayoutInflater inflater;
String Latitude, Longitude, cityName;
String[] Humidity, Speed, Description1, minTemp, maxTemp;
ArrayList<String> bitmap;
int totalDisplayDatasize = 0;
public ListViewCustomAdapter(Context context, String latitude,
String longitude, String cityName,
ArrayList<String> humidity, ArrayList<String> speed,
ArrayList<String> image, ArrayList<String> description,
ArrayList<String> tempMin, ArrayList<String> tempMax) {
this.context = context;
this.Latitude = latitude;
this.Longitude = longitude;
this.cityName = cityName;
this.bitmap = icon;
this.Humidity = humidity.toArray(new String[humidity.size()]);
this.Speed = speed.toArray(new String[speed.size()]);
this.Description1 = description.toArray(new String[description
.size()]);
this.minTemp = tempMin.toArray(new String[tempMin.size()]);
this.maxTemp = tempMax.toArray(new String[tempMax.size()]);
// /suggestion : No need to create LayoutInflater instance in
// constructor
// this.inflater = (LayoutInflater) context
// .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
/**
* set total data length for count
* */
if (this.Humidity != null)
totalDisplayDatasize = this.Humidity.length;
System.out.println("Inside ListViewCustomAdapter ");
}
@Override
public int getCount() {
// this could be one of the reason for not showing listview.set
// total data length for count
return totalDisplayDatasize;
}
@Override
public Object getItem(int i) {
return i;
}
@Override
public long getItemId(int i) {
return i;
}
private class Holder {
TextView City, MinTemp, MaxTemp, Description, Speed, Latitude,
Longitude, Humidity;
ImageView cloud;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder = null;
View view = convertView;
System.out.println("Inside getView");
if (view == null) {
System.out.println("Inside if getView");
holder = new Holder();
// / No need to create LayoutInflater instance in
// constructor
convertView = LayoutInflater.from(this.context).inflate(
R.layout.list_row_data, null);
// Create instance from convertview.findviewbyid instead of
// directly using findViewById
// holder.cloud = (ImageView) convertView
// .findViewById(R.id.cloud);
// holder.City = (TextView) convertView
// .findViewById(R.id.cityName);
holder.MinTemp = (TextView) convertView
.findViewById(R.id.minTemp);
holder.MaxTemp = (TextView) convertView
.findViewById(R.id.maxTemp);
holder.Description = (TextView) convertView
.findViewById(R.id.weather);
holder.Speed = (TextView) convertView
.findViewById(R.id.speed);
holder.Latitude = (TextView) convertView
.findViewById(R.id.latitude);
holder.Longitude = (TextView) convertView
.findViewById(R.id.longitude);
convertView.setTag(holder);
} else {
System.out.println("Inside else getView");
holder = (Holder) convertView.getTag();
}// set values here for each row
// holder.City.setText(cityName);
holder.Latitude.setText("Lat : " + Latitude);
holder.Longitude.setText("Long : " + Longitude);
holder.MaxTemp.setText("maxTemp : " + maxTemp[position]);
holder.MinTemp.setText("minTemp : " + minTemp[position]);
holder.Speed.setText("Speed : " + Speed[position]);
holder.Description.setText("Description : "
+ Description1[position]);
// #### SUGGESTION
// TO display image use ImageLoader which will download image in
// background and will display
// https://github.com/nostra13/Android-Universal-Image-Loader/tree/master/sample
// holder.cloud.setImageBitmap(bitmap.get(position));
return convertView;
}
}
}
}
class SingleRow {
String minTemp, maxTemp, speed, humidity;
Bitmap img;
SingleRow(String minTemp, String maxTemp, String speed, String humidity,
Bitmap img) {
this.maxTemp = maxTemp;
this.minTemp = minTemp;
this.speed = speed;
this.humidity = humidity;
this.img = img;
}
}
list_row_data.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_margin="5dp"
android:layout_height="wrap_content"
android:background="#ffffff"
android:orientation="vertical" >
<TextView
android:id="@+id/speed"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ffff8800" />
<TextView
android:id="@+id/weather"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ffff8800" />
<TextView
android:id="@+id/latitude"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ffff8800" />
<TextView
android:id="@+id/longitude"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ffff8800" />
<TextView
android:id="@+id/minTemp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ffff8800" />
<TextView
android:id="@+id/maxTemp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#ffff8800" />
</LinearLayout>
listview_.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ListView
android:id="@+id/listdata"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
答案 3 :(得分：0)
在adapter课程的onPostExecute方法中创建并设置ListView的{{1}}。
getCount() - 此适配器表示的数据集中有多少项。您正在返回getJSON表示您正在将适配器的数据设置为0，因此不会对任何行进行充气。
在适配器中将所有String数组更改为0，除了需要更改构造函数ArrayList<String>和getCount部分
声明
getView构造
ArrayList<Bitmap> bitmap, Humidity, Speed, Description1, minTemp, maxTemp;
getCount部分
public ListViewCustomAdapter(Context context, String latitude, String longitude, String cityName, ArrayList<String> humidity, ArrayList<String> speed, ArrayList<Bitmap> image, ArrayList<String> description, ArrayList<String> tempMin, ArrayList<String> tempMax) {
this.context = context;
this.Latitude = latitude;
this.Longitude = longitude;
this.cityName = cityName;
this.bitmap = icon;
this.Humidity = humidity;
this.Speed = speed;
this.Description1 = description;
this.minTemp = tempMin;
this.maxTemp = tempMax;
this.inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
System.out.println("Inside ListViewCustomAdapter ");
}
getView部分
@Override
public int getCount() {
return humidity.size();
}
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