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

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中定義一個回調介面，在Activity中實現該介面，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：使用介面回調和使用抽象類別回調。

正好可以複習一下介面和抽象類別的區別，於是寫了兩個Demo：

1.使用介面回調：

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;    /**    * 自訂介面，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,調用子定義介面，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需要實現自訂介面 public class MainActivity extends Activity implements OnItemClickListener,     Callback {    // 類比listview中載入的資料   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();   }    /**    * 介面方法，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.使用抽象類別回調

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;   }    /**    * 用於回調的抽象類別    * @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 {    // 類比listview中載入的資料   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]);     }     //執行個體化ContentAdapter類，並傳入實作類別     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();   }    /**    * 實作類別，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，抽象類別在Activity中實現的時候，只能定義一個成員變數來實現，不能由Activity直接實現，因為Java不支援多繼承。而介面既可以由Activity直接實現，也可以由其成員變數來實現。

原文連結：http://blog.csdn.net/u011895534/article/details/50439547

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