Android研发过程中，经常会有这样的需求，在listview、recycleview、gridview等列表控件的item中有button按钮，从而实现item的删除、收藏等等实际需求操作，可是研发人员普遍会遇到一个问题，整体item的点击事件、长按事件无效

问题原因：

button事件冲突导致列表控件的item点击事件、长按事件无效

解决方案：

（1）将列表控件中item中的button的focusable属性设置为false，以免它抢了父控件（也就是每一个Item）的焦点

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">
    <RelativeLayout
        android:id="@+id/cartleft"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <RelativeLayout
            android:layout_width="120dp"
            android:layout_height="170dp">
            <!--商品图片-->
            <ImageView
                android:id="@+id/medicineImage"
                android:layout_width="75dp"
                android:layout_height="75dp"
                android:layout_margin="5px"/>
            <TextView android:id="@+id/mname"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:layout_below="@+id/medicineImage"
                android:text="test"
                android:textSize="25px" />
            <TextView android:id="@+id/mprice"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="25px"
                android:text="价格"
                android:textColor="@color/red"
                android:layout_below="@+id/mname"/>
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="bottom|right"
                android:background="@drawable/add2cartimage"
                android:layout_alignParentRight="true"
                android:layout_alignParentEnd="true"
                android:focusable="false"
                android:layout_toRightOf="@+id/medicineImage"
                android:layout_toEndOf="@+id/medicineImage"
                android:layout_alignTop="@+id/mname" />
        </RelativeLayout>
    </RelativeLayout>
</RelativeLayout>

（2）将button控件用textview控件代替实现，将TextView的Backgroud设置成一个selector实现button的点击效果，这样就可以绕过ListView和Button的冲突问题

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <RelativeLayout
        android:id="@+id/cartleft"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <RelativeLayout
            android:layout_width="120dp"
            android:layout_height="170dp">
            <!--商品图片-->
            <ImageView
                android:id="@+id/medicineImage"
                android:layout_width="75dp"
                android:layout_height="75dp"
                android:layout_margin="5px" />

            <TextView
                android:id="@+id/mname"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:layout_below="@+id/medicineImage"
                android:text="test"
                android:textSize="25px" />

            <TextView
                android:id="@+id/mprice"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_below="@+id/mname"
                android:text="价格"
                android:textColor="@color/red"
                android:textSize="25px" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentEnd="true"
                android:layout_alignParentRight="true"
                android:layout_alignTop="@+id/mname"
                android:clickable="true"
                android:layout_toEndOf="@+id/medicineImage"
                android:layout_toRightOf="@+id/medicineImage"
                android:background="@drawable/add2cartimage"
                android:gravity="bottom|right" />
        </RelativeLayout>
    </RelativeLayout>
</RelativeLayout>

实战样例：

实战样例.gif

MainActivity.java

package itbird.com.myapplication33;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;

/**
 * MainActivity
 * @author itbird
 */
public class MainActivity extends AppCompatActivity implements ListViewAdapter.ListViewButtonClickListener {


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView = (ListView) findViewById(R.id.listview);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this, "listview item click position = " + position, Toast.LENGTH_SHORT).show();
            }
        });
        listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(MainActivity.this, "listview item long click position = " + position, Toast.LENGTH_SHORT).show();
                return true;
            }
        });
        ArrayList<String> data = new ArrayList<String>();
        data.add("test1");
        data.add("test2");
        data.add("test3");

        ListViewAdapter adapter = new ListViewAdapter(this, data);
        adapter.setOnButtonClickListener(this);
        listView.setAdapter(adapter);
    }

    @Override
    public void onClick(int position) {
        Toast.makeText(MainActivity.this, "listview item button long click position = " + position, Toast.LENGTH_SHORT).show();
    }
}

ListViewAdapter.java

package itbird.com.myapplication33;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * ListViewAdapter
 * Created by itbird on 2018/8/3.
 */

public class ListViewAdapter extends BaseAdapter {
    private Context mContext;
    private ArrayList<String> mList;
    private LayoutInflater mInflater;
    private ListViewButtonClickListener mListener;

    public ListViewAdapter(Context context, ArrayList<String> stringList) {
        mContext = context;
        mList = stringList;
        mInflater = LayoutInflater.from(mContext);
    }

    public void setOnButtonClickListener(ListViewButtonClickListener listener) {
        mListener = listener;
    }

    @Override
    public int getCount() {
        if (mList == null) {
            return 0;
        }
        return mList.size();
    }

    @Override
    public Object getItem(int position) {
        if (mList == null) {
            return null;
        }
        return mList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if (convertView == null) {
            // 下拉项布局
            convertView = mInflater.inflate(R.layout.list_item_btn, null);
            holder = new ViewHolder();
            holder.title = (TextView) convertView.findViewById(R.id.title);
            holder.btn = (Button) convertView.findViewById(R.id.btn);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.title.setText(mList.get(position));
        // 通常将position设置为tag，方便之后判断点击的button是哪一个
        holder.btn.setTag(position);
        holder.btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mListener != null) {
                    mListener.onClick(position);
                }
            }
        });
        return convertView;
    }

    class ViewHolder {
        TextView title;
        Button btn;
    }

    public interface ListViewButtonClickListener {
        void onClick(int position);
    }

}

list_item_btn.xml

<?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:gravity="center_vertical"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="6dp"
        android:textSize="16sp" />

    <Button
        android:id="@+id/btn"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:focusable="false"
        android:text="Button"
        android:textSize="16sp" />
</LinearLayout>

activity_main.xml

<?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="vertical">

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

总结

看完实际样例代码后，相信各位看官都已对本文知识要点“了然在心”，原因与解决方案都在围绕“View 的事件冲突机制”这个中心点，文章结尾，小编这里提出一个问题，希望可以达到“抛砖引玉”的效果，让各位看官主动去探索view事件传递机制的更深层次的知识点。

image.png
好了，本文话尽如此，期待各位在这个知识点有更多的收获。