ListView之在Activity里面重写item里面的事件

Posted 2020-09-07 丨丿丶

ListView是android里面用到很多的一个控件，这使用起来比较简单，又很实用。今天要讲的就是在Activity进而 重写Adapter的Button事件,废话不多说，就直接开始了
1、创建一个适配器FindAdapter.java
public class FindAdapter extends CursorAdapter implements OnClickListener{
    private Context context;//this context
    private OnItemFindClick onItemFindClick;

    public FindAdapter(Cursor cursor){
        super(
                IM.im,
                cursor,
                FLAG_REGISTER_CONTENT_OBSERVER
                );
    }

    
    public View getView(int pos, View convertView, ViewGroup parent) {
        return renderUser(pos,convertView,parent);
    }

    // 将分割线放在上面，利于判断
    public View renderUser(int pos,View view,ViewGroup parent){
        FindHolder findHolder = null;
        if(view == null){
            view = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.tt_item_find, parent,false);
            findHolder = new FindHolder(view);
            findHolder.btnRefuse.setOnClickListener(this);
            findHolder.btnRefuse.setTag(pos);//这里很容易忘记
            findHolder.btnAccept.setOnClickListener(this);
            findHolder.btnAccept.setTag(pos);
            view.setTag(findHolder);
        }else{ //ant
            findHolder = (FindHolder)view.getTag();
        }

        Cursor cursor = (Cursor)getItem(pos);
        String accountStr = cursor.getString(cursor.getColumnIndex(ContactProvider.ContactColumns.ACCOUNT));
        String nameStr = cursor.getString(cursor.getColumnIndex(ContactProvider.ContactColumns.NAME));
        findHolder.tvAccount.setText(accountStr+""); 
        findHolder.tvName.setText(nameStr); 
        findHolder.ivcAvatar.setImageDrawable(IM.getAvatar(accountStr));  
        return view;
    }

    public void setOnItemFindClick(OnItemFindClick onItemFindClick){
        this.onItemFindClick = onItemFindClick;
    }
    
    class FindHolder{
        TextView tvAccount;
        TextView tvName;
        ImageViewCircle ivcAvatar;
        Button btnRefuse;
        Button btnAccept;
        
        public FindHolder(View v){
            tvAccount = (TextView)v.findViewById(R.id.tt_item_find_account);
            tvName = (TextView)v.findViewById(R.id.tt_item_find_name);
            ivcAvatar = (ImageViewCircle)v.findViewById(R.id.tt_item_find_icon);
            btnRefuse = (Button)v.findViewById(R.id.tt_item_find_refuse);
            btnAccept = (Button)v.findViewById(R.id.tt_item_find_accept);
        }
    }
    
    public interface OnItemFindClick{
         public void onAcceptClick(View v);
         public void onRefuseClick(View v);
    }
    
    public void onClick(View v) {
        switch(v.getId()){
        case R.id.tt_item_find_accept://答应请求
            onItemFindClick.onAcceptClick(v);
            break;
        case R.id.tt_item_find_refuse://拒绝请求
            onItemFindClick.onRefuseClick(v);
            break;
        }
    }


    public void bindView(View arg0, Context arg1, Cursor arg2) {}

    public View newView(Context arg0, Cursor arg1, ViewGroup arg2) {
        return null;
    }
}

2.当然需要一个布局哦！这里是我的布局tt_item_find.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical" >

    <com.chat.ui.widget.ImageViewCircle
        android:id="@+id/tt_item_find_icon"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:layout_marginLeft="10dp"
        android:scaleType="centerCrop"
        android:src="@drawable/tt_login_logo" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_marginLeft="10dp" >

         <TextView
            android:id="@+id/tt_item_find_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/contact_realname_color"
            android:textSize="17sp" />
         
        <TextView
            android:id="@+id/tt_item_find_account"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@color/contact_name_color"
            android:textSize="12sp" />
       
    </LinearLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="right"
        android:orientation="horizontal"
        android:layout_marginRight="10dp">

        <Button
            android:id="@+id/tt_item_find_accept"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="10dp"
            android:background="@drawable/tt_show_head_toast_bg"
            android:text="@string/tt_item_find_accept"
            android:textColor="@color/contact_realname_color"
            android:paddingLeft="5dp"
            android:paddingRight="5dp"/>
        
         <Button
            android:id="@+id/tt_item_find_refuse"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/tt_show_head_toast_bg"
            android:text="@string/tt_item_find_refuse"
            android:textColor="@color/contact_realname_color"
            android:paddingLeft="5dp"
            android:paddingRight="5dp"/>
         
    </LinearLayout>

</LinearLayout>

3.现在item开始了，就开始写Activity了
public class FindActivity  extends Activity implements OnItemFindClick{
    
    private ListView list;
    private FindAdapter findAdapter;
    private OnItemFindClick onItemFindClick;
    private Cursor cursor;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        initPatent();
        init();
        initData();
    }
    //cursor的数据自己去加载吧
    private void initData(){}

    private void init(){
        context = this;
        list = (ListView)contentView.findViewById(R.id.tt_activity_find_list);
        onItemFindClick = this;
        findAdapter = new FindAdapter(cursor);
        findAdapter.setOnItemFindClick(onItemFindClick);
        list.setAdapter(findAdapter);
    }

    //接受好友请求
    public void onAcceptClick(View v) {
        Log.e("findActivity-->","accept");
        Log.e("find---》",""+ v.getTag());
        final Cursor cursor = (Cursor)findAdapter.getItem((Integer) v.getTag());
    }

    //拒绝好友请求
    public void onRefuseClick(View v) {
        Log.e("findActivity-->","refuse");
    }
}

4.activitty的布局自己去写吧！好了就完事了。