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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
<?xml version="1.0" encoding="utf-8"?>
<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
<?xml version="1.0" encoding="utf-8"?>
<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<String> mList = new ArrayList<>();
public MyAdapter(Context context, List<String> 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<String> 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 item的点击事件
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();
}
});
//ListView item 中的删除按钮的点击事件
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。