我正在使用此Tutorial来创建带有单选按钮的自定义列表视图。在本教程中，当我们单击列表中的项目时，项目的颜色会发生变化。
这种情况发生在我测试4.0以上的代码但4.0以下时它不能正常工作我不明白为什么????
类Blog.java
public class Blog extends Activity {
ListView listView;
ArrayList< String>arrayList; // list of the strings that should appear in ListView
ArrayAdapter arrayAdapter; // a middle man to bind ListView and array list
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom);
listView = (ListView) findViewById(R.id.lstDemo);
// LIST OF STRINGS / DATA THAT SHOULD APPEAR IN LISTVIEW HERE WE HAVE HARD CODED IT WE CAN TAKE THIS INPUT FROM USER AS WELL
arrayList = new ArrayList();
arrayList.add("India");
arrayList.add("USA");
arrayList.add("England");
arrayList.add("Singapur");
arrayList.add("China");
arrayList.add("Canada");
arrayList.add("Srilanka");
arrayList.add("SouthAfrica");
arrayAdapter = new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_single_choice,arrayList);
listView.setAdapter(arrayAdapter);
// LETS HIGHLIGHT SELECTED ITEMS
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView arg0, View view, int position,
long itemId) {
/*
* when we click on item on list view we can get it catch item here.
* so view is the item clicked in list view and position is the position
* of that item in list view which was clicked.
*
* Now that we know which item is click we can easily change the color
* of text but when we click on next item we we have to deselect the old
* selected item means recolor it back to default , and then hight the
* new selected item by coloring it .
*
* So here's the code of doing it.
*
*
* */
CheckedTextView textView = (CheckedTextView) view;
for (int i = 0; i < listView.getCount(); i++) {
textView= (CheckedTextView) listView.getChildAt(i);
if (textView != null) {
textView.setTextColor(Color.WHITE);
}
}
listView.invalidate();
textView = (CheckedTextView) view;
if (textView != null) {
textView.setTextColor(Color.BLUE);
}
}
});
}
}
我的xml视图
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/lstDemo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:choiceMode="singleChoice">
</ListView>
答案 0 :(得分：0)
向我们展示您的适配器代码，并尝试不从setOnItemClickListener更改列表视图项，而是更改您的数据并通知适配器刷新视图。
将其设置为列表项的背景：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:color="@color/white" />
<item android:color="@color/black" />
</selector>
答案 1 :(得分：0)
像这样定义你的变量
private ProgressDialog pDialog;
private ListView lv;
private ArrayList<GoModelAll> m_ArrayList = null;
GoArrayAdapter gaa;
像这样定义你的AsyncTask
new GoAsyncTask().execute();
您的AsyncTask类代码如下
class GoAsyncTask extends AsyncTask<String, Void, String> {
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
/*pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Please wait ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();*/
pd.show();
}
@Override
protected String doInBackground(String... params) {
sal = new StaticApiList();
myUrl = StaticApiList.go_api;
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(myUrl);
try {
HttpResponse httpResponse = httpClient.execute(httpGet);
System.out.println("httpResponse");
InputStream inputStream = httpResponse.getEntity().getContent();
InputStreamReader inputStreamReader = new InputStreamReader(
inputStream);
BufferedReader bufferedReader = new BufferedReader(
inputStreamReader);
StringBuilder stringBuilder = new StringBuilder();
String bufferedStrChunk = null;
while ((bufferedStrChunk = bufferedReader.readLine()) != null) {
stringBuilder.append(bufferedStrChunk);
}
jsonString = stringBuilder.toString();
Log.i("talk_all_json", jsonString);
return stringBuilder.toString();
} catch (ClientProtocolException cpe) {
System.out.println("Exception generates caz of httpResponse :"
+ cpe);
cpe.printStackTrace();
} catch (IOException ioe) {
System.out
.println("Second exception generates caz of httpResponse :"
+ ioe);
ioe.printStackTrace();
}
return null;
}
@SuppressWarnings("static-access")
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
vivek = true;
try{
m_ArrayList = new ArrayList<GoModelAll>();
if (jsonString.length() > 0) {
JSONArray jArray = new JSONArray(jsonString);
dh.open();
for(int i=0; i < jArray.length(); i++) {
JSONObject jObject = jArray.getJSONObject(i);
description = jObject.getString("description");
excert = jObject.getString("excert");
thumsrc = jObject.getString("thumsrc");
title = jObject.getString("title");
postid = jObject.getInt("postid");
Log.d("talklog", "Title -> " + title + " , thumsrc -> " + thumsrc
+ " , excert -> " + excert + " , description -> " + description);
Log.d("talklog", "============================= end of " + i + " ===============================");
gma = new GoModelAll();
gma.description = description;
gma.excert = excert;
gma.thumsrc = thumsrc;
gma.title = title;
gma.postid = postid;
Cursor cursor = dh.getSeenStatus(gma.postid);
if(cursor.getCount()>0)
{
cursor.moveToFirst();
if(cursor.getInt(0) == 0)
{
gma.isSeen = false;
}
else
{
gma.isSeen = true;
}
}
else
{
ContentValues cv = new ContentValues();
cv.put(DbHandler.KEY_ID, postid);
cv.put(DbHandler.KEY_VALUE, 0);
dh.addData(DbHandler.TABLE_SEEN, cv);
}
m_ArrayList.add(gma);
}
dh.close();
}
gaa = new GoArrayAdapter(getActivity(), m_ArrayList);
lv = (ListView) getActivity().findViewById(R.id.go_list);
lv.setVisibility(View.VISIBLE);
lv.setAdapter(gaa);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
dh.open();
dh.updateSeenStatus(m_ArrayList.get(arg2).postid, 1);
m_ArrayList.get(arg2).isSeen = true;
dh.close();
GoDetail fragment = new GoDetail();
Bundle bundle = new Bundle();
bundle.putString("title", m_ArrayList.get(arg2).title);
bundle.putString("excert", m_ArrayList.get(arg2).excert);
bundle.putString("description", m_ArrayList.get(arg2).description);
bundle.putString("thumsrc", m_ArrayList.get(arg2).thumsrc);
bundle.putString("header_title", "Go");
//bundle.putInt("postid", m_ArrayList.get(arg2).postid);
fragment.setArguments(bundle);
((BaseContainerFragment)getParentFragment()).replaceFragment(fragment, true);
}
});
}catch(Exception e){
e.printStackTrace();
}
//pDialog.dismiss();
pd.dismiss();
}
}
您的适配器类
public class GoArrayAdapter extends ArrayAdapter<GoModelAll> {
private final Context context;
ImageLoader imgLoader;
private final ArrayList<GoModelAll> values;
DataHelper dh;
public GoArrayAdapter(Context context,
ArrayList<GoModelAll> values) {
super(context, R.layout.go_row, values);
this.context = context;
this.values = values;
imgLoader = new ImageLoader(context);
dh = new DataHelper(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.go_row, parent, false);
/** Get view over here.. */
GoModelAll asm = values.get(position);
TextView title = (TextView) rowView.findViewById(R.id.go_tv);
ImageView business_logo = (ImageView) rowView.findViewById(R.id.go_image);
ImageView go_red = (ImageView)rowView.findViewById(R.id.go_red);
if(asm.isSeen)
{
go_red.setVisibility(View.INVISIBLE);
}
/**Set view over here..*/
title.setText(asm.title);
// Loader image - will be shown before loading image
int loader = R.drawable.image_not_available;
String image_url = asm.thumsrc;
imgLoader.DisplayImage(image_url, loader, business_logo);
return rowView;
}
}
最后你的Model类
public class GoModelAll {
public String description = "";
public String excert = "";
public String thumsrc = "";
public String title = "";
public int postid = 0;
public boolean isSeen = false;
}