ListView子对象可点击冲突

时间：2013-12-16 12:36:20

标签： android listview android-listview

在提出问题并花了15天时间来解决这个问题后，我再次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listview。 一切正常。 现在，在列表视图中，我有2个textview，我希望它是可点击的，其中一个是＆＃34;接受＆＃34;，textview只是在xml中，它没有填充适配器或Json 。 ＆＃34;接受＆＃34;应该像这样工作＆＃34;将文本更改为已接受并更改颜色＆＃34;它的工作就像其他一切一样。但是当我点击第一个＆＃34;在列表视图中接受＆＃34;（位置0）时 它会更改其他列表视图项目（位置4,9）。就像我点击位置4,9上的文本视图一样。 在第一张图片上点击＆＃34;接受＆＃34;第二个是点击。

before clicking /// after 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 

    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;

}

3 个答案:

答案 0 :(得分：6)

您需要了解listview回收机制的工作原理

How ListView's recycling mechanism works

使用模型类。假设您已经拥有以下

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();
}
};

Exaplanation：

您使用具有getter和setter的模型类。

您setTag到有位置的按钮。在onClick中，您获得标记即位置并相应地更改内容。您可以通过调用适配器上的notifyDataSetChanged来刷新列表视图。

为了别人的利益，这是一个例子

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;
    }

}

CustomListAdapter 

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 

<?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中

<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>

对齐

单击第1行和第5行的按钮，使其更改为“已接受”并为蓝色。

enter image description here

答案 1 :(得分：1)

getView(...){
if ((row == null) || (row.getTag()==null)) {
 // some code
}else{
 // some code
}
holder.accept.setTag(position);

// some more code

if(newsItem.isSelected()){
holder.accept.setText("accepted");
}else{
holder.accept.setText("accept");
}

//handling click
holder.accept.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View arg0) {

                int position = (Integer)arg0.getTag();
                // change backing dataset here instead.
                FeedItem m = listData.get(position);
                // declare a boolean 'selected' in FeedItem 
                // toggle the previous selection
                m.setSelected(! m.isSelected());
                // call notifydatasetChanged
                CustomListAdapter.this.notifyDataSetChanged();

    }
});

// some more code
}


class FeedItem{
// some data member

boolean selected = false;
public boolean isSelected(){
return selected;
}

public void setSelected(boolean status){
selected = status;
}
}

答案 2 :(得分：0)

您的问题肯定来自于重复使用时不重置视图状态的事实。 ListView重用视图以实现更好的内存管理。因此，根据项目的选定状态调整您的getView()以调整文本和颜色。我没有看到你将它保存在代码中的哪个位置，所以我不能给你一个有效的例子。

像

这样的东西 
    if (newsItem.selected)
      holder.accept.setText("accepted");
    else
      holder.accept.setText("accept");
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