(Android学习之路)Android中listView结合自定义适配器，并实现item中button点击事件
16lz
2021-01-26
此次是用listView结合BaseAdapter实现。
一、在activity_main中写一listview组件
<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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" android:layout_alignParentTop="true" android:layout_alignTop="@id/button_add"> ListView> <Button android:id="@+id/button_add" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:text="addItem"/>RelativeLayout>二、新建listView显示layout：list_view_layout.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"> <TextView android:id="@+id/listView_TextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="30sp" android:text="你好"/> <Button android:id="@+id/button_item" android:layout_width="wrap_content" android:layout_height="wrap_content" android:focusable="false" android:text="点我"/>LinearLayout>三、新建一bean类：ListBean
public class ListBean { private String mText; //listView要显示的数据 private int mCurrentPos; //当前位置 private String mCurrentData; //当前位置数据 public ListBean(String text){ this.mText = text; } public ListBean(){} public String getmText() { return mText; } public void setmText(String mText) { this.mText = mText; } public int getmCurrentPos() { return mCurrentPos; } public void setmCurrentPos(int mCurrentPos) { this.mCurrentPos = mCurrentPos; } public String getmCurrentData() { return mCurrentData; } public void setmCurrentData(String mCurrentData) { this.mCurrentData = mCurrentData; }}四、自定义一适配器MyAdapter，继承自BaseAdapter
package com.dfxh.listviewdemo;import android.content.Context;import android.util.Log;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.List;/** * * author : WangChaowei * time : 2018/2/27. * desc : 自定义适配器，继承自BaseAdapter *
*/public class MyAdapter extends BaseAdapter { private Context mContext; private List mData; private CallBackInterface mCallBackInterface; //回调接口 /** * 有参构造 * @param context * @param data */ public MyAdapter(Context context, List data, CallBackInterface callBack){ this.mContext = context; this.mData = data; this.mCallBackInterface = callBack; } /** * listView的item总数 */ @Override public int getCount() { return mData.size(); } /** * 获取每一项数据 * @param position * @return */ @Override public Object getItem(int position) { return mData.get(position); } /** * 获取数据ID * @param position * @return */ @Override public long getItemId(int position) { return position; } /** * 项显示的view * @param position * @param convertView * @param parent * @return */ @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder viewHolder = null; ListBean listBean = mData.get(position); //convertView用于将加载好的布局进行缓存，先判断是否为空，可优化listView if (convertView == null){ viewHolder = new ViewHolder(); //1、引用layout布局 convertView = LayoutInflater.from(mContext).inflate(R.layout.list_view_layout, parent, false); //2、填充当前项的数据 viewHolder.textView = convertView.findViewById(R.id.listView_TextView); viewHolder.button = convertView.findViewById(R.id.button_item); convertView.setTag(viewHolder); //3、在view上保存所需数据 }else { viewHolder = (ViewHolder) convertView.getTag(); } //设置数据 viewHolder.textView.setText(listBean.getmText()); listBean.setmCurrentPos(position); //listview中的点击事件 viewHolder.button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mCallBackInterface.callBackClick(position); } }); return convertView; } /** * ViewHolder通常出现在适配器里，为的是listview滚动的时候快速设置值，而不必每次都重新创建很多对象，从而提升性能 */ private static class ViewHolder{ TextView textView; Button button; }} 五、新建一回调接口，用于操作在Item中button的点击回调（也可用抽象类回调，或者自定义点击事件）
public interface CallBackInterface { void callBackClick(int position);}六、MainActivity
public class MainActivity extends AppCompatActivity implements View.OnClickListener,CallBackInterface{ private Button button_add; private ListView listView; private MyAdapter myAdapter; private List mData; private ListBean listBean; private int num = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initData(); } /** * 初始化组件 */ private void initView() { button_add = (Button)findViewById(R.id.button_add); listView = (ListView)findViewById(R.id.listView); button_add.setOnClickListener(this); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(MainActivity.this,"Item点击，第" + position + "行",Toast.LENGTH_SHORT).show(); button_add.setText("获取该行的值：" + mData.get(position).getmText()); } }); } /** * 初始化数据 */ private void initData() { mData = new ArrayList<>(); mData.add(new ListBean("来数数吧")); myAdapter = new MyAdapter(this,mData,this); listView.setAdapter(myAdapter); //listView关联适配器 } @Override public void onClick(View v) { switch (v.getId()){ case R.id.button_add : listBean = new ListBean(); listBean.setmText(String.valueOf(num)); mData.add(listBean); myAdapter.notifyDataSetChanged(); //更新适配器 num ++; break; } } @Override public void callBackClick(int position) { Toast.makeText(this,"按钮点击，当前行：" + (position + 1),Toast.LENGTH_SHORT).show(); }} 这样只能点击Item中的button有点击事件。
若可点击Item，也可点击Item中的button，就要在button 布局中加入取消焦点：
android:focusable="false"这样既可点击Item，也可以点击Item中的button，并都有事件触发
更多相关文章
- Android之PopupWindow+ListView+在item顶部底部跳跃
- Android(安卓)Parcel和Parcelable类
- RecyclerView 中 item 点击事件的优化
- Android(安卓)Activity 传入/回传数据
- Android(安卓)实现适配器中的子控件与Activity通信
- Android远程连接SQL Server 2008数据库
- Android(安卓)AlertDialog的各种用法总结
- Android(安卓)-- 使用OKhttp获取response时遇到的坑
- Android(安卓)OpenGL开发实践 - GLSurfaceView对YUV格式数据的处