作者:储茹吉雅卿 | 来源:互联网 | 2023-09-04 19:02
在使用ListView的时候,我们通常会使用到其item的点击事件。而有些时候我们可能会用到item内部控件的点击操作,比如在item内部有个Button,当点击该Button时,删除所在的item。
效果图如下图所示
「Talk is cheap. Show me the code」
怎么实现这个操作呢?先来看下代码:
先看布局文件activity_main.xml
只有一个ListView
<LinearLayout
xmlns:android ="http://schemas.android.com/apk/res/android"
android:layout_width ="match_parent"
android:layout_height ="match_parent" >
<ListView
android:id ="@+id/listView"
android:layout_width ="match_parent"
android:layout_height ="wrap_content"
/>
LinearLayout >
再看ListView的item布局文件list_item.xml
包括了一个TextView和一个Button
其中Button添加了一个属性android:focusable=”false”
目的是为了不让Button强制获取item的焦点,否则item的点击事件就没用了
<LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:layout_width ="match_parent"
android:layout_height ="match_parent"
android:orientation ="horizontal" >
<TextView
android:id ="@+id/item_tv"
android:layout_width ="0dp"
android:layout_height ="wrap_content"
android:layout_weight ="1"
android:gravity ="center"
android:text ="this is text"
android:textSize ="24dp" />
<Button
android:focusable ="false"
android:id ="@+id/item_btn"
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:text ="删除" />
LinearLayout >
自定义适配器MyAdapter.java
其中使用了接口回调,当点击删除按钮的时候,将点击item的position作为参数传出去
public class MyAdapter extends BaseAdapter {
private Context mContext;
private List mList = new ArrayList<>();
public MyAdapter (Context context, List list) {
mCOntext= context;
mList = list;
}
@Override
public int getCount () {
return mList.size();
}
@Override
public Object getItem (int i) {
return mList.get(i);
}
@Override
public long getItemId (int i) {
return i;
}
@Override
public View getView (final int i, View view, ViewGroup viewGroup) {
ViewHolder viewHolder = null ;
if (view == null ) {
viewHolder = new ViewHolder();
view = LayoutInflater.from(mContext).inflate(R.layout.list_item, null );
viewHolder.mTextView = (TextView) view.findViewById(R.id.item_tv);
viewHolder.mButton = (Button) view.findViewById(R.id.item_btn);
view.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) view.getTag();
}
viewHolder.mTextView.setText(mList.get(i));
viewHolder.mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick (View v) {
mOnItemDeleteListener.onDeleteClick(i);
}
});
return view;
}
/**
* 删除按钮的监听接口
*/
public interface onItemDeleteListener {
void onDeleteClick(int i);
}
private onItemDeleteListener mOnItemDeleteListener;
public void setOnItemDeleteClickListener (onItemDeleteListener mOnItemDeleteListener) {
this .mOnItemDeleteListener= mOnItemDeleteListener;
}
class ViewHolder {
TextView mTextView;
Button mButton;
}
}
最后是MainActivity.java
public class MainActivity extends AppCompatActivity {
private ListView listView;
private List mList = new ArrayList<>();
@Override
protected void onCreate (Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initList();
this .listView = (ListView) findViewById(R.id.listView);
final MyAdapter adapter = new MyAdapter(MainActivity.this , mList);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick (AdapterView> adapterView, View view, int i, long l) {
Toast.makeText(MainActivity.this , "Click item" + i, Toast.LENGTH_SHORT).show();
}
});
adapter.setOnItemDeleteClickListener(new MyAdapter.onItemDeleteListener() {
@Override
public void onDeleteClick (int i) {
mList.remove(i);
adapter.notifyDataSetChanged();
}
});
}
/**
* 初始化数据
*/
private void initList () {
for (int i = 0 ; i <20 ; i++) {
mList.add(i + "" );
}
}
}
当点击删除按钮时,删除mList中的数据,并调用notifyDataSetChanged()方法刷新item数据,达到点击item内部删除按钮,以删除当前item的效果。
Demo下载地址:https://github.com/JZHowe/ListViewItemClick