在Activity中响应ListView内部按钮的点击事件

最新推荐文章于 2021-05-26 02:51:52 发布

转载最新推荐文章于 2021-05-26 02:51:52 发布 · 433 阅读

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本文介绍在Android开发中，如何实现在Activity中响应ListView内部按钮的点击事件，提供了使用接口回调和抽象类回调两种方法的具体实现步骤。

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转自：http://www.cnblogs.com/ivan-xu/p/4124967.html

如何在Activity中响应ListView内部按钮的点击事件，不要在Adapter中响应？

使用接口回调和使用抽象类回调。

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。