如何使用两个数组填充自定义列表。
How to populate a custom list with two arrays.
我创建了一个自定义适配器 class 和一个名为 Bean 的 getter 和 setter class。这是为了制作一个包含文本视图和图像的列表视图。
如何填充 myList 以便它在我设置适配器时可用，从而将数组中的相应文本和图像显示到我的 listView 中？
我已经为我的适配器和 bean class 以及我的 Main Activity Class' Async Task 提供了代码，但问题出在我的 Async 的 onPostExecute 方法中class。
澄清一下。此代码尚未经过测试，因此未返回任何错误。我的问题是如何使用来自字符串数组 "descriptionArray" 和 "photoArray".
的信息在 onPostExecute 方法中填充 myList
我的主要 Activity Class' 异步任务
private class MyTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
String content = HttpManager.getData(params[0]);
return content;
}
//-----------------------THIS IS WHERE THE ISSUE IS HAPPENING---------------------------
@Override
protected void onPostExecute(String result) {
hideDialog();
String parseResult = InfoJSONResultParser.parseFeed(result);
importerArray = OrderInformationParser.orderParser(result);
if (parseResult.equals("ok")) {
//Returns the Array with the JSON info already parsed.
List<Bean> myList = new ArrayList<>(); //<---***How to populate this***
//***With the information from these two String arrays.***
String[] descriptionArray = OrderInformationParser.orderParser(result);
String[] photoArray = PhotoParser.photoParser(result);
//This creates and executes the list
list = (ListView)findViewById(R.id.orderListView);
//***So i can then transfer over to this adapter***
MyAdapter adapter = new MyAdapter(MainActivity.this, myList);
list.setAdapter(adapter);
} else {
findViewById(R.id.nullOrders).setVisibility(View.VISIBLE);
}
}
}
适配器Class
public class MyAdapter extends BaseAdapter {
private Context mContext;
private List<Bean> mList;
public MyAdapter(Context context,List<Bean> list){
mContext=context;
mList=list;
}
@Override
public int getCount() {
return mList.size();
}
@Override
public Object getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
//use converview recycle
if(convertView==null){
holder=new ViewHolder();
convertView = LayoutInflater.from(mContext).inflate(R.layout.content_orders, parent, false);
holder.textView= (TextView) convertView.findViewById(R.id.textView2);
holder.imageView= (ImageView) convertView.findViewById(R.id.imageView2);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
//set text and url
holder.textView.setText(mList.get(position).getText());
Picasso.with(mContext).load(mList.get(position).getUrl()).into(holder.imageView);
return convertView;
}
class ViewHolder{
TextView textView;
ImageView imageView;
}
}
豆子Class
public class Bean {
String text;
String url;
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
您可以通过迭代 2 个数组并将字符串添加到 Bean 对象来填充您的列表。
示例：
private List<Bean> populateBeanList(List<Bean> myList, String[] descArray, String[] photoArray){
for(int i=0; i< descArray.length; i++){
Bean bean = new Bean();
bean.setText(descArray[i]);
bean.setUrl(photoArray[i]);
myList.Add(bean);
}
return myList;
}
然后调用异步中的函数Class
private class MyTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
String content = HttpManager.getData(params[0]);
return content;
}
//-----------------------THIS IS WHERE THE ISSUE IS HAPPENING---------------------------
@Override
protected void onPostExecute(String result) {
hideDialog();
String parseResult = InfoJSONResultParser.parseFeed(result);
importerArray = OrderInformationParser.orderParser(result);
if (parseResult.equals("ok")) {
//Returns the Array with the JSON info already parsed.
List<Bean> myList = new ArrayList<>(); //<---***How to populate this***
//***With the information from these two String arrays.***
String[] descriptionArray = OrderInformationParser.orderParser(result);
String[] photoArray = PhotoParser.photoParser(result);
myList = populateBeanList(myList,descriptionArray, photoArray);
//This creates and executes the list
list = (ListView)findViewById(R.id.orderListView);
//***So i can then transfer over to this adapter***
MyAdapter adapter = new MyAdapter(MainActivity.this, myList);
list.setAdapter(adapter);
} else {
findViewById(R.id.nullOrders).setVisibility(View.VISIBLE);
}
}
}
更新：
public class MyAdapter extends BaseAdapter {
private Activity activity;
private List<Bean> mList;
private static LayoutInflater inflater;
public MyAdapter(Activity act,List<Bean> list){
activity=act;
mList=list;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return mList.size();
}
@Override
public Object getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
//use converview recycle
if(convertView==null){
convertView = inflater.inflate(R.layout.content_orders, null);
holder=new ViewHolder();
holder.textView= (TextView) convertView.findViewById(R.id.textView2);
holder.imageView= (ImageView) convertView.findViewById(R.id.imageView2);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
//set text and url
holder.textView.setText(mList.get(position).getText());
Picasso.with(activity).load(mList.get(position).getUrl()).into(holder.imageView);
return convertView;
}
class ViewHolder{
TextView textView;
ImageView imageView;
}
}
根据我对你的问题的了解，你不知道如何填充列表。
嗯，这很容易。假设 descriptionArray 包含文本，photoArray 包含网址。
需要的代码是：
首先，为Beanclass添加一个构造函数为了方便：
public Bean(String text, String url) {
this.text = text;
this.url = url;
}
它只是添加了一个非空构造函数，因此我们可以在创建实例时直接初始化 class 字段。
其次，调用ArrayList的方法add。像这样：
myList.add(new Bean(text, url))
显然你需要把它放在一个 for 循环中（对于数组的每一项你插入一个新的 Bean）。所以它会是这样的：
for (int i=0; i<descriptionArray.lenght; i++) {
myList.add(new Bean(descriptionArray[i], photoArray[i]);
}
这将为 descriptionArray 和 photoArray 中的每一对创建一个新的 Bean。
因此，您需要检查两个数组的大小是否相同。
为此，您必须将 for 循环放在 if:
中
if (descriptionArray.lenght == photoArray.lenght) {
//execute for loop
}
else {
//Arrays have different size. Wtf? Manage the error
}
也许在发帖前花点时间Google研究一下这个话题;)
希望对您有所帮助
我创建了一个自定义适配器 class 和一个名为 Bean 的 getter 和 setter class。这是为了制作一个包含文本视图和图像的列表视图。
如何填充 myList 以便它在我设置适配器时可用，从而将数组中的相应文本和图像显示到我的 listView 中？
我已经为我的适配器和 bean class 以及我的 Main Activity Class' Async Task 提供了代码，但问题出在我的 Async 的 onPostExecute 方法中class。
澄清一下。此代码尚未经过测试，因此未返回任何错误。我的问题是如何使用来自字符串数组 "descriptionArray" 和 "photoArray".
的信息在 onPostExecute 方法中填充 myList我的主要 Activity Class' 异步任务
private class MyTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
String content = HttpManager.getData(params[0]);
return content;
}
//-----------------------THIS IS WHERE THE ISSUE IS HAPPENING---------------------------
@Override
protected void onPostExecute(String result) {
hideDialog();
String parseResult = InfoJSONResultParser.parseFeed(result);
importerArray = OrderInformationParser.orderParser(result);
if (parseResult.equals("ok")) {
//Returns the Array with the JSON info already parsed.
List<Bean> myList = new ArrayList<>(); //<---***How to populate this***
//***With the information from these two String arrays.***
String[] descriptionArray = OrderInformationParser.orderParser(result);
String[] photoArray = PhotoParser.photoParser(result);
//This creates and executes the list
list = (ListView)findViewById(R.id.orderListView);
//***So i can then transfer over to this adapter***
MyAdapter adapter = new MyAdapter(MainActivity.this, myList);
list.setAdapter(adapter);
} else {
findViewById(R.id.nullOrders).setVisibility(View.VISIBLE);
}
}
}
适配器Class
public class MyAdapter extends BaseAdapter {
private Context mContext;
private List<Bean> mList;
public MyAdapter(Context context,List<Bean> list){
mContext=context;
mList=list;
}
@Override
public int getCount() {
return mList.size();
}
@Override
public Object getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
//use converview recycle
if(convertView==null){
holder=new ViewHolder();
convertView = LayoutInflater.from(mContext).inflate(R.layout.content_orders, parent, false);
holder.textView= (TextView) convertView.findViewById(R.id.textView2);
holder.imageView= (ImageView) convertView.findViewById(R.id.imageView2);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
//set text and url
holder.textView.setText(mList.get(position).getText());
Picasso.with(mContext).load(mList.get(position).getUrl()).into(holder.imageView);
return convertView;
}
class ViewHolder{
TextView textView;
ImageView imageView;
}
}
豆子Class
public class Bean {
String text;
String url;
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
您可以通过迭代 2 个数组并将字符串添加到 Bean 对象来填充您的列表。
示例：
private List<Bean> populateBeanList(List<Bean> myList, String[] descArray, String[] photoArray){
for(int i=0; i< descArray.length; i++){
Bean bean = new Bean();
bean.setText(descArray[i]);
bean.setUrl(photoArray[i]);
myList.Add(bean);
}
return myList;
}
然后调用异步中的函数Class
private class MyTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
String content = HttpManager.getData(params[0]);
return content;
}
//-----------------------THIS IS WHERE THE ISSUE IS HAPPENING---------------------------
@Override
protected void onPostExecute(String result) {
hideDialog();
String parseResult = InfoJSONResultParser.parseFeed(result);
importerArray = OrderInformationParser.orderParser(result);
if (parseResult.equals("ok")) {
//Returns the Array with the JSON info already parsed.
List<Bean> myList = new ArrayList<>(); //<---***How to populate this***
//***With the information from these two String arrays.***
String[] descriptionArray = OrderInformationParser.orderParser(result);
String[] photoArray = PhotoParser.photoParser(result);
myList = populateBeanList(myList,descriptionArray, photoArray);
//This creates and executes the list
list = (ListView)findViewById(R.id.orderListView);
//***So i can then transfer over to this adapter***
MyAdapter adapter = new MyAdapter(MainActivity.this, myList);
list.setAdapter(adapter);
} else {
findViewById(R.id.nullOrders).setVisibility(View.VISIBLE);
}
}
}
更新：
public class MyAdapter extends BaseAdapter {
private Activity activity;
private List<Bean> mList;
private static LayoutInflater inflater;
public MyAdapter(Activity act,List<Bean> list){
activity=act;
mList=list;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return mList.size();
}
@Override
public Object getItem(int position) {
return mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
//use converview recycle
if(convertView==null){
convertView = inflater.inflate(R.layout.content_orders, null);
holder=new ViewHolder();
holder.textView= (TextView) convertView.findViewById(R.id.textView2);
holder.imageView= (ImageView) convertView.findViewById(R.id.imageView2);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
//set text and url
holder.textView.setText(mList.get(position).getText());
Picasso.with(activity).load(mList.get(position).getUrl()).into(holder.imageView);
return convertView;
}
class ViewHolder{
TextView textView;
ImageView imageView;
}
}
根据我对你的问题的了解，你不知道如何填充列表。
嗯，这很容易。假设 descriptionArray 包含文本，photoArray 包含网址。
需要的代码是：
首先，为Beanclass添加一个构造函数为了方便：
public Bean(String text, String url) {
this.text = text;
this.url = url;
}
它只是添加了一个非空构造函数，因此我们可以在创建实例时直接初始化 class 字段。
其次，调用ArrayList的方法add。像这样：
myList.add(new Bean(text, url))
显然你需要把它放在一个 for 循环中（对于数组的每一项你插入一个新的 Bean）。所以它会是这样的：
for (int i=0; i<descriptionArray.lenght; i++) {
myList.add(new Bean(descriptionArray[i], photoArray[i]);
}
这将为 descriptionArray 和 photoArray 中的每一对创建一个新的 Bean。
因此，您需要检查两个数组的大小是否相同。
为此，您必须将 for 循环放在 if:
if (descriptionArray.lenght == photoArray.lenght) {
//execute for loop
}
else {
//Arrays have different size. Wtf? Manage the error
}
也许在发帖前花点时间Google研究一下这个话题;)
希望对您有所帮助