ListView实现Item中关于点击事件的例子

场景

场景1

Item中包含若干个Button，且Button需要响应点击事件。
此时实现思路可以是通过接口回调或者抽象类的形式来实现Button的点击事件。

场景2

Item和Item中的Button均需要响应点击事件。
此时需要在item.xml中根目录设置属性android:descendantFocusability=”blocksDescendants”，并且设置Button按钮
android:focusable=”false”属性，这样可以同时响应item的点击事件和item中Button的点击事件。

实现方式

　接口回调

通过接口回调实现Item中Button的点击事件，思路是在适配器中定义一个接口，接口中定义一个抽象方法，并在适配器中实现View.OnClickListener，在重载的onClick方法中调用接口中的方法，在Activity层实现适配器中定义的接口，通过接口回调的方式实现按钮点击事件。

　源码

适配器

package com.example.a002034.listviewitemclickdemo.adapter;

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 com.example.a002034.listviewitemclickdemo.R;

import java.util.ArrayList;
import java.util.List;

/**
 * 使用接口回调的方式实现button点击事件.
 *
 * @author xuzhuyun
 */
@SuppressWarnings("unused")
public class MyAdapter extends BaseAdapter implements View.OnClickListener {
    List<String> mStringList = new ArrayList();
    private Context mContext;
    private Callback mCallback;

    public MyAdapter(Context context, Callback callback) {
        mContext = context;
        mCallback = callback;
    }

    public void setStringList(List<String> stringList) {
        mStringList = stringList;
    }

    public List<String> getStringList() {
        return mStringList;
    }

    @Override
    public int getCount() {
        return mStringList.size();
    }

    @Override
    public Object getItem(int i) {
        return getCount() == 0 ? null : mStringList.get(i);
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder viewHolder;
        if (view == null) {
            view = LayoutInflater.from(mContext).inflate(R.layout.lv_test_item, null);
            viewHolder = new ViewHolder();
            viewHolder.mTvItemName = view.findViewById(R.id.tv_name);
            viewHolder.mBtnClick = view.findViewById(R.id.btn_click);
            view.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) view.getTag();
        }
        viewHolder.mTvItemName.setText(mStringList.get(i));
        viewHolder.mBtnClick.setOnClickListener(this);
        viewHolder.mBtnClick.setTag(i);//保存当前点击按钮的位置
        return view;
    }


    class ViewHolder {
        TextView mTvItemName;
        Button mBtnClick;
    }


    @Override
    public void onClick(View view) {
        mCallback.click(view);
    }

    /**
     * 回调接口.
     */
    public interface Callback {
        void click(View v);
    }
}

Activity

package com.example.a002034.listviewitemclickdemo;

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

import com.example.a002034.listviewitemclickdemo.adapter.MyAdapter;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements MyAdapter.Callback, AdapterView.OnItemClickListener {
    private ListView mListView;
    private MyAdapter mMyAdapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mListView = findViewById(R.id.lv_test);
        List<String> mList = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            mList.add("测试item" + i);
        }
        mMyAdapter = new MyAdapter(this, this);
        mMyAdapter.setStringList(mList);
        mListView.setAdapter(mMyAdapter);
        mListView.setOnItemClickListener(this);
    }


    @Override
    public void click(View v) {
        int position = (int) v.getTag();
        String clickItemText = mMyAdapter.getStringList().get(position);
        Toast.makeText(this, "button click -->"+clickItemText, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        Toast.makeText(this,"listview item click -- >"
                + mMyAdapter.getStringList().get(i), Toast.LENGTH_SHORT).show();
    }
}

使用抽象类回调

定义一个抽象类继承自View.OnClickListener，在Activity中实例化该抽象类，并在Adapter实例化的时候传入adapter，然后Button绑定点击事件时，即可传入该抽象类，通过抽象类完成点击事件的回调。

源码

适配器

package com.example.a002034.listviewitemclickdemo.adapter;

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 com.example.a002034.listviewitemclickdemo.R;

import java.util.ArrayList;
import java.util.List;

/**
 * 使用接口回调的方式实现button点击事件.
 *
 * @author xuzhuyun
 */
@SuppressWarnings("unused")
public class MyAdapter2 extends BaseAdapter {
    List<String> mStringList = new ArrayList();
    private Context mContext;
    private MyClickListener mMyClickListener;

    public MyAdapter2(Context context, MyClickListener myClickListener) {
        mContext = context;
        mMyClickListener = myClickListener;
    }

    public void setStringList(List<String> stringList) {
        mStringList = stringList;
    }

    public List<String> getStringList() {
        return mStringList;
    }

    @Override
    public int getCount() {
        return mStringList.size();
    }

    @Override
    public Object getItem(int i) {
        return getCount() == 0 ? null : mStringList.get(i);
    }

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

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder viewHolder;
        if (view == null) {
            view = LayoutInflater.from(mContext).inflate(R.layout.lv_test_item, null);
            viewHolder = new ViewHolder();
            viewHolder.mTvItemName = view.findViewById(R.id.tv_name);
            viewHolder.mBtnClick = view.findViewById(R.id.btn_click);
            view.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) view.getTag();
        }
        viewHolder.mTvItemName.setText(mStringList.get(i));
        viewHolder.mBtnClick.setTag(i);
        viewHolder.mBtnClick.setOnClickListener(mMyClickListener);
        return view;
    }


    class ViewHolder {
        TextView mTvItemName;
        Button mBtnClick;
    }

    public static abstract class MyClickListener implements View.OnClickListener {
        @Override
        public void onClick(View view) {
            myOnClick((Integer) view.getTag(), view);
        }

        public abstract void myOnClick(int position, View v);
    }
}

Activity

package com.example.a002034.listviewitemclickdemo;

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

import com.example.a002034.listviewitemclickdemo.adapter.MyAdapter;
import com.example.a002034.listviewitemclickdemo.adapter.MyAdapter2;

import java.util.ArrayList;
import java.util.List;

public class MainActivity2 extends AppCompatActivity implements AdapterView.OnItemClickListener {
    private ListView mListView;
    private MyAdapter2 mMyAdapter2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mListView = findViewById(R.id.lv_test);
        List<String> mList = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            mList.add("测试item" + i);
        }
        mMyAdapter2 = new MyAdapter2(this, mMyClickListener);
        mMyAdapter2.setStringList(mList);
        mListView.setAdapter(mMyAdapter2);
        mListView.setOnItemClickListener(this);
    }

    private MyAdapter2.MyClickListener mMyClickListener = new MyAdapter2.MyClickListener() {
        @Override
        public void myOnClick(int position, View v) {
            Toast.makeText(MainActivity2.this, "button click -- >" + mMyAdapter2.getStringList().get(position), Toast.LENGTH_SHORT).show();
        }
    };


    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        Toast.makeText(this, "listview item click -- >" + mMyAdapter2.getStringList().get(i), Toast.LENGTH_SHORT).show();
    }
}