android中在Activity中响应ListView内部按钮的点击事件的两种方法

最近交流群里面有人问到一个问题：如何在Activity中响应ListView内部按钮的点击事件，不要在Adapter中响应？

对于这个问题，我最初给他的解答是，在Adapter中定义一个回调接口，在Activity中实现该接口，从而实现对点击事件的响应。

下班后思考了一下，觉得有两种方式都能比较好的实现：使用接口回调和使用抽象类回调。

正好可以复习一下接口和抽象类的区别，于是写了两个Demo：

1.使用接口回调：

Adapter类

package com.ivan.adapter;

import java.util.List;

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

import com.ivan.listvieweventcallback.R;

public class ContentAdapter extends BaseAdapter implements OnClickListener {

  private static final String TAG = "ContentAdapter";
  private List<String> mContentList;
  private LayoutInflater mInflater;
  private Callback mCallback;

  /**
   * 自定义接口，用于回调按钮点击事件到Activity
   * @author Ivan Xu
   * 2014-11-26
   */
  public interface Callback {
    public void click(View v);
  }

  public ContentAdapter(Context context, List<String> contentList,
      Callback callback) {
    mContentList = contentList;
    mInflater = LayoutInflater.from(context);
    mCallback = callback;
  }

  @Override
  public int getCount() {
    Log.i(TAG, "getCount");
    return mContentList.size();
  }

  @Override
  public Object getItem(int position) {
    Log.i(TAG, "getItem");
    return mContentList.get(position);
  }

  @Override
  public long getItemId(int position) {
    Log.i(TAG, "getItemId");
    return position;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    Log.i(TAG, "getView");
    ViewHolder holder = null;
    if (convertView == null) {
      convertView = mInflater.inflate(R.layout.list_item, null);
      holder = new ViewHolder();
      holder.textView = (TextView) convertView
          .findViewById(R.id.textView1);
      holder.button = (Button) convertView.findViewById(R.id.button1);
      convertView.setTag(holder);
    } else {
      holder = (ViewHolder) convertView.getTag();
    }
    holder.textView.setText(mContentList.get(position));


    holder.button.setOnClickListener(this);
    holder.button.setTag(position);
    return convertView;
  }

  public class ViewHolder {
    public TextView textView;
    public Button button;
  }

  //响应按钮点击事件,调用子定义接口，并传入View
  @Override
  public void onClick(View v) {
    mCallback.click(v);
  }
}

Activity类：

package com.ivan.listvieweventdemo;

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

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

import com.ivan.adapter.ContentAdapter;
import com.ivan.adapter.ContentAdapter.Callback;
import com.ivan.listvieweventcallback.R;
//MainActivity需要实现自定义接口
public class MainActivity extends Activity implements OnItemClickListener,
    Callback {

  // 模拟listview中加载的数据
  private static final String[] CONTENTS = { "北京", "上海", "广州", "深圳", "苏州",
      "南京", "武汉", "长沙", "杭州" };
  private List<String> contentList;
  private ListView mListView;

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

    init();
  }

  private void init() {
    mListView = (ListView) findViewById(R.id.listview);
    contentList = new ArrayList<String>();
    for (int i = 0; i < CONTENTS.length; i++) {
      contentList.add(CONTENTS[i]);
    }
    //
    mListView.setAdapter(new ContentAdapter(this, contentList, this));
    mListView.setOnItemClickListener(this);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

  /**
   * 响应ListView中item的点击事件
   */
  @Override
  public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {
    Toast.makeText(this, "listview的item被点击了！，点击的位置是-->" + position,
        Toast.LENGTH_SHORT).show();
  }

  /**
   * 接口方法，响应ListView按钮点击事件
   */
  @Override
  public void click(View v) {
    Toast.makeText(
        MainActivity.this,
        "listview的内部的按钮被点击了！，位置是-->" + (Integer) v.getTag() + ",内容是-->"
            + contentList.get((Integer) v.getTag()),
        Toast.LENGTH_SHORT).show();
  }
}

2.使用抽象类回调

Adapter类：

package com.ivan.adapter;

import java.util.List;

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

import com.ivan.listvieweventabstract.R;

public class ContentAdapter extends BaseAdapter {

  private static final String TAG = "ContentAdapter";
  private List<String> mContentList;
  private LayoutInflater mInflater;
  private MyClickListener mListener;

  public ContentAdapter(Context context, List<String> contentList,
      MyClickListener listener) {
    mContentList = contentList;
    mInflater = LayoutInflater.from(context);
    mListener = listener;
  }

  @Override
  public int getCount() {
    Log.i(TAG, "getCount");
    return mContentList.size();
  }

  @Override
  public Object getItem(int position) {
    Log.i(TAG, "getItem");
    return mContentList.get(position);
  }

  @Override
  public long getItemId(int position) {
    Log.i(TAG, "getItemId");
    return position;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    Log.i(TAG, "getView");
    ViewHolder holder = null;
    if (convertView == null) {
      convertView = mInflater.inflate(R.layout.list_item, null);
      holder = new ViewHolder();
      holder.textView = (TextView) convertView
          .findViewById(R.id.textView1);
      holder.button = (Button) convertView.findViewById(R.id.button1);
      convertView.setTag(holder);
    } else {
      holder = (ViewHolder) convertView.getTag();
    }
    holder.textView.setText(mContentList.get(position));
    holder.button.setOnClickListener(mListener);
    holder.button.setTag(position);
    return convertView;
  }

  public class ViewHolder {
    public TextView textView;
    public Button button;
  }

  /**
   * 用于回调的抽象类
   * @author Ivan Xu
   * 2014-11-26
   */
  public static abstract class MyClickListener implements OnClickListener {
    /**
     * 基类的onClick方法
     */
    @Override
    public void onClick(View v) {
      myOnClick((Integer) v.getTag(), v);
    }
    public abstract void myOnClick(int position, View v);
  }
}

Activity类：

package com.ivan.listvieweventdemo;

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

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

import com.ivan.adapter.ContentAdapter;
import com.ivan.adapter.ContentAdapter.MyClickListener;
import com.ivan.listvieweventabstract.R;

public class MainActivity extends Activity implements OnItemClickListener {

  // 模拟listview中加载的数据
  private static final String[] CONTENTS = { "北京", "上海", "广州", "深圳", "苏州",
      "南京", "武汉", "长沙", "杭州" };
  private List<String> contentList;
  private ListView mListView;

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

    init();
  }

  private void init() {
    mListView = (ListView) findViewById(R.id.listview);
    contentList = new ArrayList<String>();
    for (int i = 0; i < CONTENTS.length; i++) {
      contentList.add(CONTENTS[i]);
    }
    //实例化ContentAdapter类，并传入实现类
    mListView.setAdapter(new ContentAdapter(this, contentList, mListener));

    mListView.setOnItemClickListener(this);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

  //响应item点击事件
  @Override
  public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {
    Toast.makeText(this, "listview的item被点击了！，点击的位置是-->" + position,
        Toast.LENGTH_SHORT).show();
  }

  /**
   * 实现类，响应按钮点击事件
   */
  private MyClickListener mListener = new MyClickListener() {
    @Override
    public void myOnClick(int position, View v) {
      Toast.makeText(
          MainActivity.this,
          "listview的内部的按钮被点击了！，位置是-->" + position + ",内容是-->"
              + contentList.get(position), Toast.LENGTH_SHORT)
          .show();
    }
  };
}

两种方式的区别在于，抽象类在Activity中实现的时候，只能定义一个成员变量来实现，不能由Activity直接实现，因为Java不支持多继承。而接口既可以由Activity直接实现，也可以由其成员变量来实现。

转载于：http://blog.csdn.net/u011895534/article/details/50439547