android中在Activity中響應ListView內部按鈕的點擊事件的兩種方法

最近交流群裡面有人問到一個問題：如何在Activity中響應ListView內部按鈕的點擊事件，不要在Adapter中響應？

對於這個問題，我最初給他的解答是，在Adapter中定義一個回調接口，在Activity中實現該接口，從而實現對點擊事件的響應。

下班後思考了一下，覺得有兩種方式都能比較好的實現：使用接口回調和使用抽象類回調。

正好可以復習一下接口和抽象類的區別，於是寫了兩個Demo：

1.使用接口回調：

Adapter類

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; 
 
  /** 
   * 自定義接口，用於回調按鈕點擊事件到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; 
  } 
 
  //響應按鈕點擊事件,調用子定義接口，並傳入View 
  @Override 
  public void onClick(View v) { 
    mCallback.click(v); 
  } 
} 

Activity類：

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需要實現自定義接口 
public class MainActivity extends Activity implements OnItemClickListener, 
    Callback { 
 
  // 模擬listview中加載的數據 
  private static final String[] CONTENTS = { "北京", "上海", "廣州", "深圳", "蘇州", 
      "南京", "武漢", "長沙", "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; 
  } 
 
  /** 
   * 響應ListView中item的點擊事件 
   */ 
  @Override 
  public void onItemClick(AdapterView<?> arg0, View v, int position, long id) { 
    Toast.makeText(this, "listview的item被點擊了！，點擊的位置是-->" + position, 
        Toast.LENGTH_SHORT).show(); 
  } 
 
  /** 
   * 接口方法，響應ListView按鈕點擊事件 
   */ 
  @Override 
  public void click(View v) { 
    Toast.makeText( 
        MainActivity.this, 
        "listview的內部的按鈕被點擊了！，位置是-->" + (Integer) v.getTag() + ",內容是-->" 
            + contentList.get((Integer) v.getTag()), 
        Toast.LENGTH_SHORT).show(); 
  } 
} 

2.使用抽象類回調

Adapter類：

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; 
  } 
 
  /** 
   * 用於回調的抽象類 
   * @author Ivan Xu 
   * 2014-11-26 
   */ 
  public static abstract class MyClickListener implements OnClickListener { 
    /** 
     * 基類的onClick方法 
     */ 
    @Override 
    public void onClick(View v) { 
      myOnClick((Integer) v.getTag(), v); 
    } 
    public abstract void myOnClick(int position, View v); 
  } 
} 

Activity類：

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 { 
 
  // 模擬listview中加載的數據 
  private static final String[] CONTENTS = { "北京", "上海", "廣州", "深圳", "蘇州", 
      "南京", "武漢", "長沙", "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]); 
    } 
    //實例化ContentAdapter類，並傳入實現類 
    mListView.setAdapter(new ContentAdapter(this, contentList, mListener)); 
     
    mListView.setOnItemClickListener(this); 
  } 
 
  @Override 
  public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
  } 
 
  //響應item點擊事件 
  @Override 
  public void onItemClick(AdapterView<?> arg0, View v, int position, long id) { 
    Toast.makeText(this, "listview的item被點擊了！，點擊的位置是-->" + position, 
        Toast.LENGTH_SHORT).show(); 
  } 
 
  /** 
   * 實現類，響應按鈕點擊事件 
   */ 
  private MyClickListener mListener = new MyClickListener() { 
    @Override 
    public void myOnClick(int position, View v) { 
      Toast.makeText( 
          MainActivity.this, 
          "listview的內部的按鈕被點擊了！，位置是-->" + position + ",內容是-->" 
              + contentList.get(position), Toast.LENGTH_SHORT) 
          .show(); 
    } 
  }; 
} 

兩種方式的區別在於，抽象類在Activity中實現的時候，只能定義一個成員變量來實現，不能由Activity直接實現，因為Java不支持多繼承。而接口既可以由Activity直接實現，也可以由其成員變量來實現。

原文鏈接：http://blog.csdn.net/u011895534/article/details/50439547

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