Question

我的ListView中有Button和TextView，我会在按钮上添加监听器，但我不能这样做。

其实我在我的适配器中：

[代码]

        imgClassement.setImageResource(drawable);
        imgClassement.setTag(mail);
        imgClassement.setOnClickListener(new OnClickListener(){

         @Override
         public void onClick(View view){

          //I would like display an alerts in my activity

         }


        });

[/代码]

OnClick有效但是，我想在我的活动上显示警报，我不能这样做：/我不知道如何谎言我的活动和我的适配器

Answer 1

通过使用ClickableListAdapter，我们可以为每个列表项的列表视图中的按钮提供操作。此代码可帮助您获取列表中的按钮功能。公共课 { int id; 字符串名称; }

ArrayList<Play> playlistname=new ArrayList<Play>();

Listview playlist;
MyClickableListAdapter list= new MyClickableListAdapter(this,R.layout.editlist, playlistname);
playlist.setAdapter(list);

//xml
<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"
           android:layout_width="fill_parent" android:layout_height="45dip"
           android:orientation="horizontal" 
          >
<Button android:paddingLeft="5dip" android:id="@+id/playlisticon"
            android:layout_gravity="center_vertical" android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:paddingRight="5sp" />             
<TextView
   android:layout_width="fill_parent" android:id="@+id/playlistname"
   android:layout_height="wrap_content" android:textColor="#000000"
   android:padding="10dp" android:textStyle="bold"
   android:textSize="12px" android:layout_weight="1">
</TextView>
</LinearLayout>     

static class MyViewHolder extends "packagename of your app".ClickableListAdapter.ViewHolder 
{ 
     TextView text; 
         ImageView icon;
         public MyViewHolder(TextView id,ImageView i) 
         {  
        text = id;  
        icon = i;
         } 
 }

  //MyClickableListAdapter to perform on click functionality on ListView
 public class MyClickableListAdapter extends ClickableListAdapter 
 {

    public MyClickableListAdapter(Context context, int viewid,List<Play> objects)
    {  

        super(context, viewid, objects); 
    } 
    protected void bindHolder(ViewHolder holder)
         { 
        MyViewHolder mvh = (MyViewHolder) holder;  
        Play item = (Play)mvh.data;  

            mvh.icon.setVisibility(View.VISIBLE);  //this is button
            mvh.icon.setImageResource(R.drawable.cancel_button);  
            mvh.text.setText(item.name);//this textview
      } 
    @Override  
    protected ViewHolder createHolder(View v) 
    {
        TextView text = (TextView) v.findViewById(R.id.playlistname); 
        ImageView  icon = (ImageView) v.findViewById(R.id.playlisticon);
        ViewHolder mvh = new MyViewHolder(text,icon);   

        icon.setOnClickListener(new ClickableListAdapter.OnClickListener(mvh) 
        {  
            public void onClick(View v, ViewHolder viewHolder)
            {  
                 // we toggle the enabled state and also switch the icon  

                MyViewHolder mvh = (MyViewHolder) viewHolder;  
                final Play item = (Play) mvh.data;  
                //check the id to delete the PlayList from second List 
                //here u can write the function that has to work while we 
                                      click on each button in list      
                } 
        });   
                return mvh; // finally, we return our new holder  

 }

   //this class for ClickableListAdapter  used for clicking the any item in the list.....
   public abstract class ClickableListAdapter extends BaseAdapter 
   {
String type;
private LayoutInflater mInflater;
private List<?> mDataObjects;
private int mViewId;

public static class ViewHolder
{
public Object data;
}

public static abstract class OnClickListener implements View.OnClickListener
{
private ViewHolder mViewHolder;

public  OnClickListener(ViewHolder holder)
{
    mViewHolder=holder;
}
public void onClick(View v)
{
    onClick(v,mViewHolder);
}
 public abstract void onClick(View v, ViewHolder viewHolder);
    // TODO Auto-generated method stub
};

public ClickableListAdapter(Context context, int viewid,
        List< "applicationpackagename".Play> objects) 
{
    // TODO Auto-generated constructor stub
         mInflater = LayoutInflater.from(context);  
         mDataObjects = objects;  
         mViewId = viewid;  
         type="Rowcontain";

        if (objects == null) 
        {  
            mDataObjects = new ArrayList<Object>();  
        }  
}
public ClickableListAdapter(Context context, int viewid,
        List<  "applicationpackagename".Play> objects, int x) 
{
    // TODO Auto-generated constructor stub
         mInflater = LayoutInflater.from(context);  
         mDataObjects = objects;  
         mViewId = viewid;  
         type="Rowdata";
        if (objects == null)
        {  
            mDataObjects = new ArrayList<Object>();  
        }  
}



@Override
public int getCount()
{
    // TODO Auto-generated method stub
    return mDataObjects.size();
}

@Override
public Object getItem(int position) 
{
    // TODO Auto-generated method stub

        return  mDataObjects.get(position); 
}

@Override
public long getItemId(int position) 
{
    // TODO Auto-generated method stub
    return position;
}

@Override
public View getView(int position, View view, ViewGroup parent) 
{
    // TODO Auto-generated method stub
    ViewHolder holder;
    if(view==null)
    {
          view = mInflater.inflate(mViewId, null);  
          // call the user's implementation  
          holder = createHolder(view);  
          // we set the holder as tag  
          view.setTag(holder);  

    } 
    else
    {  
         // get holder back...much faster than inflate  
         holder = (ViewHolder) view.getTag();  
    }  

    // we must update the object's reference  
    holder.data = getItem(position);  
    // call the user's implementation  
    bindHolder(holder);  
    return view;  
}  
protected abstract ViewHolder createHolder(View v);  
protected abstract void bindHolder(ViewHolder h);  
 }

Answer 2

事实上，当用户点击按钮时，我会在第一个列表上方显示一个列表。所以我想起AlertsDialog来做到这一点。如果用户点击整行，我会显示另一个活动。

但是就像适配器上的OnClick一样，我无法检索活动列表中所选项目的位置。

实际上点击整行是有效的，但不是点击行上的按钮。

listView中的按钮

2 个答案: