ListView 子对象可点击冲突 [英] ListView subobject clickable confilct
问题描述
在提出问题并花了 15 天解决此问题后，我再次在这里寻求帮助和解决方案.在 MainActivity 中，我创建了 Json 下载任务，它从 http 下载数据，并使用 CustomListAdapter.class 填充列表视图.一切正常.现在，在列表视图中，我有 2 个文本视图，我希望可以点击它们，其中一个是接受"，该文本视图只是在 xml 中，它没有填充适配器或 Json.接受"应该像这样将文本更改为接受并更改颜色"，并且它的工作方式与其他所有内容一样.但是当我在列表视图中单击第一个接受"(位置 0)时它会更改其他列表视图项(位置 4,9).就像我点击了位置 4,9 上的 textviews 一样.第一张图片是在点击接受"之前，第二张是点击之后.
After asking a question and spending 15 days to solve this, i am looking for help and solution here again. In MainActivity i have created Json Downloading Task which is downloading data from http and with CustomListAdapter.class i populate the listview. Everything works. Now, in the listview i have 2 textview's which i want to be clickable, one of them is "Accept", that textview is just in xml it's not populated with Adapter or Json. "Accept" should work like this "Change the text to Accepted and change color" and its working like everything else. BUT when i click on first "Accept"(Position 0) in listview it changes other listview items (Position 4,9). It's like i clicked textviews on Position 4,9. On first image is before clicking the "Accept" and second on is afer clicking.
///
public class MainActivity extends Activity {
protected static final String TAG = null;
public ArrayList<FeedItem> feedList;
public ListView feedListView;
private ProgressBar progressbar;
private CustomListAdapter adap;
private LayoutInflater mInflater;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
feedListView= (ListView) findViewById(R.id.custom_list);
mInflater = (LayoutInflater) getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
String url = "...";
new DownloadFilesTask().execute(url);
getActionBar().setIcon(R.drawable.angel);
progressbar = (ProgressBar)findViewById(R.id.progressBar);
public void updateList() {
adap = new CustomListAdapter(this, feedList);
feedListView.setAdapter(adap);
}
public class DownloadFilesTask extends AsyncTask<String, Integer, Void> {
///....
CustomListAdapter.class
CustomListAdapter.class
public class CustomListAdapter extends BaseAdapter
{
private ArrayList<FeedItem> listData;
private LayoutInflater layoutInflater;
private Context mContext;
private ArrayList<String> data;
protected ListView feedListView;
ArrayList<HashMap<String,String>> list;
public CustomListAdapter(Context context, ArrayList<FeedItem> listData)
{
this.listData = listData;
layoutInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mContext = context;
data = new ArrayList<String>();
for (int i = 0; i < 10; i++) {
data.add("Sample Text " + String.valueOf(i));
}
}
@Override
public int getCount()
{
return listData.size();
}
@Override
public Object getItem(int position)
{
return listData.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
public View getView( int position, View convertView, ViewGroup parent)
{
final ViewHolder holder;
View row=convertView;
if ((row == null) || (row.getTag()==null)) {
convertView = layoutInflater.inflate(R.layout.list_row_layout, null);
holder = new ViewHolder();
holder.headlineView = (TextView)convertView.findViewById(R.id.name);
holder.reportedDateView = (TextView) convertView.findViewById(R.id.confid);
holder.accept= (TextView) convertView.findViewById(R.id.acceptTV);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
final FeedItem newsItem = (FeedItem) listData.get(position);
holder.accept.setFocusable(true);
holder.accept.setClickable(true);
holder.headlineView.setText(Html.fromHtml(newsItem.getTitle()));
holder.reportedDateView.setText(Html.fromHtml(newsItem.getContent()));
holder.accept.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
holder.accept.setText(Html.fromHtml(newsItem.getContent()));
}
});
return convertView;
}
static class ViewHolder
{
TextView accept;
TextView headlineView;
TextView reportedDateView;
ImageView imageView;
FeedItem newsItem;
}
推荐答案
你需要了解listview回收机制是如何工作的
You need to understand how listview recycle mechanism works
使用模型类.假设你已经有了下面的
Use a Model Class. Assume you already have the below
public class FeedItem {
String title,content;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
在getView
holder.accept.setText(listData.get(position).getContent());
holder.accept.setTag(position);
holder.accept.setOnClickListener(mClickListener);
然后
private OnClickListener mClickListener = new OnClickListener() {
public void onClick(View v) {
int pos = (Integer) v.getTag();
FeedItem newsItem = (FeedItem) listData.get(pos);
newsItem.setContent("Accepted");
CustomListadapter.this.notifyDataSetChanged();
}
};
说明:
您使用具有 getter 和 setter 的模型类.
You use a model class which has getters and setters.
你setTag到按钮的位置.在 onClick 中，您获得标签即位置并相应地更改内容.您可以通过在适配器上调用 notifyDataSetChanged 来刷新列表视图.
You setTag to the button with position. In onClick you get the tag ie position and change the content accordingly. You refresh listview by calling notifyDataSetChanged on the adapter.
为了他人的利益，这里有一个例子
For the benefit of others here's a example
public class MainActivity extends Activity {
ArrayList<Holder> list = new ArrayList<Holder>();
ListView lv;
CustomListAdapter cus;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.listView1);
for(int i=0;i<10;i++)
{
Holder h = new Holder();
h.setTitle("Title"+i);
h.setContent("Content"+i);
h.setColor(Color.BLACK);
list.add(h);
}
cus = new CustomListAdapter(this,list);
lv.setAdapter(cus);
}
}
模型类持有人
public class Holder {
String title,content;
int color;
public int getColor() {
return color;
public void setColor(int color) {
this.color = color;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
自定义列表适配器
public class CustomListAdapter extends BaseAdapter{
LayoutInflater inflater;
ArrayList<Holder> list;
public CustomListAdapter(MainActivity mainActivity, ArrayList<Holder> list) {
inflater = LayoutInflater.from(mainActivity);
this.list =list;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.list_item,
parent, false);
holder = new ViewHolder();
holder.tv = (TextView) convertView.findViewById(R.id.textView1);
holder.b = (Button) convertView.findViewById(R.id.button1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
Holder h = list.get(position);
holder.tv.setText(h.getTitle());
holder.b.setText(h.getContent());
holder.b.setTextColor(h.getColor());
holder.b.setOnClickListener(mClickListener);
holder.b.setTag(position);
return convertView;
}
private OnClickListener mClickListener = new OnClickListener() {
public void onClick(View v) {
int pos = (Integer) v.getTag();
Holder h = (Holder) list.get(pos);
h.setContent("Accepted");
h.setColor(Color.BLUE);
CustomListAdapter.this.notifyDataSetChanged();
}
};
static class ViewHolder
{
TextView tv;
Button b;
}
}
list_item.xml
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="40dp"
android:text="Button" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button1"
android:layout_alignParentLeft="true"
android:layout_marginLeft="22dp"
android:text="TextView" />
</RelativeLayout>
activity_main.xml
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
</ListView>
</RelativeLayout>
捕捉
点击第 1 行和第 5 行的按钮，使其变为已接受且为蓝色.
Button at row 1 and 5 is clicked so it is changed to Accepted and is Blue.
这篇关于ListView 子对象可点击冲突的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
