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。

原文链接：http://blog.csdn.net/u011895534/article/details/50439547

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