开源项目MultiChoiceAdapter详解（五）——可扩展的MultiChoiceBaseAdapter-白红宇

开源项目MultiChoiceAdapter详解（五）——可扩展的MultiChoiceBaseAdapter

阅读量：6688 次

发布时间：2019-06-25

本文共 14428 字，大约阅读时间需要 48 分钟。

　　上次写到了，其实我们仍旧可以不使用ActionMode的，所以这里就写一个自己扩展的方法。

一、布局文件

listview_normal_layout.xml

item.xml

view_header.xml

这个是用于给listview添加一个头部视图的，顺带学习下listview添加顶部视图的方法呗~

二、继承类然后实现

可以看见这里关于ActionMode有关的回调方法我都是空实现

private class MultiBaseAdapter extends MultiChoiceBaseAdapter{        private String[] mData;                /**         * 构造函数         * @param savedInstanceState         */        public MultiBaseAdapter(Bundle savedInstanceState,String[] data) {            super(savedInstanceState);            // TODO 自动生成的构造函数存根            mData = data;        }        @Override        public boolean onCreateActionMode(ActionMode mode, Menu menu) {            return true;        }                @Override        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {            return false;        }                        @Override        public boolean onPrepareActionMode(ActionMode arg0, Menu arg1) {            // TODO 自动生成的方法存根            return false;        }        /**         * 看适配器中有多少元素需要加载         */        @Override        public int getCount() {            // TODO 自动生成的方法存根            return mData.length;        }        /**         * 通过position来得到相应的item，这里返回object对象         */        @Override        public Object getItem(int position) {            // TODO 自动生成的方法存根            return mData[position];        }        /**         * 通过position得到id         */        @Override        public long getItemId(int position) {            // TODO 自动生成的方法存根            return position;        }        /**         * 返回item的view对象         */        @Override        protected View getViewImpl(int position, View convertView, ViewGroup parent) {            if (convertView == null) {                int layout = R.layout.item;                LayoutInflater inflater = LayoutInflater.from(getContext());                convertView = inflater.inflate(layout, parent, false);            }            ViewGroup group = (ViewGroup)convertView;            ((TextView)group.findViewById(R.id.item_textView)).setText(mData[position]);            ((CheckBox)group.findViewById(android.R.id.checkbox)).setVisibility(View.VISIBLE);            return group;        }                    }

三、配置适配器和相应的监听器

listView.addHeaderView(createHeaderView(), null, false);是给listview添加头视图的方法，传入false表示头图不能点击

private MultiBaseAdapter adapter;        @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO 自动生成的方法存根        super.onCreate(savedInstanceState);        setContentView(R.layout.listview_normal_layout);                String[] data = {"android","ios","wp","c++",                 "java","c#","javascript","vb",                 "delphi","PB","ASP","SQL"};                final LinearLayout settingLL = (LinearLayout)findViewById(R.id.setting_linearLayout);        settingLL.setVisibility(View.GONE);                ListView listView = (ListView)findViewById(R.id.normal_listView);        /**         * 给listview顶部添加2个额外视图，设置顶部视图不可点击         */        listView.addHeaderView(createHeaderView(), null, false);        listView.addHeaderView(createHeaderView(), null, false);        //实例化适配器        adapter = new MultiBaseAdapter(savedInstanceState, data);        //添加视图        adapter.setAdapterView(listView);        //设置不显示actionMode        adapter.showActionMode(false);        //点击事件        adapter.setOnItemClickListener(new MyItemClick(adapter));        //监听选中的状态        adapter.setOnSelectedStateChangeListener(new OnSelectedStateChangeListener() {            /**             * checkedItemCount = 已经选中的item数目             */            @Override            public void onSelectedStateChanged(int checkedItemCount) {                if (checkedItemCount != 0) {                    settingLL.setVisibility(View.VISIBLE);                }                else {                    settingLL.setVisibility(View.GONE);                }            }        });    }

private View createHeaderView() {        return LayoutInflater.from(this).inflate(R.layout.view_header, null);    }

点击事件的监听器：

/**     * @author:Jack Tony     * @tips  :点击事件的监听器     * @date  :2014-10-20     */    private class MyItemClick implements OnItemClickListener{        private MultiChoiceBaseAdapter mAdapter;                public MyItemClick(MultiChoiceBaseAdapter adapter) {            mAdapter = adapter;        }                @Override        public void onItemClick(AdapterView
      arg0, View arg1, int position, long arg3) {            //因为在顶部添加了2个视图，所以这里的位置要下移两位                        Toast.makeText(getApplicationContext(), "点击了: " + mAdapter.getItem(position - 2), Toast.LENGTH_SHORT).show();        }            }

四、用回调方法来优化

@Override    protected void onSaveInstanceState(Bundle outState) {        adapter.save(outState);    }        @Override      public boolean onKeyDown(int keyCode, KeyEvent event) {         if (keyCode == KeyEvent.KEYCODE_BACK ) {              if (adapter.getCheckedItemCount() > 0) {                cancleAll(adapter);                return true;            }                        }         return super.onKeyDown(keyCode, event);    }

public void buttonListener(View v) {        switch (v.getId()) {        case R.id.selectAll_button:            selectAll(adapter);            break;        case R.id.cancle_button:            cancleAll(adapter);            break;        case R.id.delete_button:            delectItems(adapter);            break;        case R.id.share_button:            Toast.makeText(getApplicationContext(), "分享"+Arrays.toString(getSelectedItems(adapter)), 1).show();            cancleAll(adapter);            break;        default:            break;        }    }        /**     * 全选     * @param adapter     */    private void selectAll(MultiChoiceBaseAdapter  adapter) {        for (int i = 0; i < adapter.getCount(); ++i) {            adapter.setItemChecked(i, true);        }    }        /**     * 取消所有选择效果     * @param adapter     */    private void cancleAll(MultiChoiceBaseAdapter  adapter) {        for (int i = 0; i < adapter.getCount(); ++i) {            adapter.setItemChecked(i, false);        }    }        /**     * 得到已经选中的items     * @param adapter     * @return     */    private String[] getSelectedItems(MultiChoiceBaseAdapter adapter) {        //得到选中的items        Set
     
       selection = adapter.getCheckedItems();        String[] items = new String[selection.size()];        int i = 0;        for (long position : selection) {            items[i++] = (String)adapter.getItem((int)position);        }        return items;    }        /**     * 删除已经选中的items     * @param adapter     */    private void delectItems(MultiChoiceBaseAdapter  adapter) {        //通过判断名字来remove掉这些items        // TODO:删除某些元素，因为这里的数据源是String[]所以没有链表那样好删除，就没去实现。        //实际中：推荐用链表来动态删除元素，在删除时需要注意的是最好以唯一的id，如position来进行删除        cancleAll(adapter);    }

搞定了！！！

全部代码：

package com.kale.multichoiceadaptertest;import java.util.Arrays;import java.util.Set;import android.app.Activity;import android.os.Bundle;import android.support.v7.view.ActionMode;import android.view.KeyEvent;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.CheckBox;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import com.manuelpeinado.multichoiceadapter.base.OnSelectedStateChangeListener;import com.manuelpeinado.multichoiceadapter.compat.MultiChoiceBaseAdapter;public class BaseAdapterNormalTestActivity extends Activity{    private MultiBaseAdapter adapter;        @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO 自动生成的方法存根        super.onCreate(savedInstanceState);        setContentView(R.layout.listview_normal_layout);                String[] data = {"android","ios","wp","c++",                 "java","c#","javascript","vb",                 "delphi","PB","ASP","SQL"};                final LinearLayout settingLL = (LinearLayout)findViewById(R.id.setting_linearLayout);        settingLL.setVisibility(View.GONE);                ListView listView = (ListView)findViewById(R.id.normal_listView);        /**         * 给listview顶部添加2个额外视图，设置顶部视图不可点击         */        listView.addHeaderView(createHeaderView(), null, false);        listView.addHeaderView(createHeaderView(), null, false);        //实例化适配器        adapter = new MultiBaseAdapter(savedInstanceState, data);        //添加视图        adapter.setAdapterView(listView);        //设置不显示actionMode        adapter.showActionMode(false);        //点击事件        adapter.setOnItemClickListener(new MyItemClick(adapter));        //监听选中的状态        adapter.setOnSelectedStateChangeListener(new OnSelectedStateChangeListener() {            /**             * checkedItemCount = 已经选中的item数目             */            @Override            public void onSelectedStateChanged(int checkedItemCount) {                if (checkedItemCount != 0) {                    settingLL.setVisibility(View.VISIBLE);                }                else {                    settingLL.setVisibility(View.GONE);                }            }        });    }            @Override    protected void onSaveInstanceState(Bundle outState) {        adapter.save(outState);    }        @Override      public boolean onKeyDown(int keyCode, KeyEvent event) {         if (keyCode == KeyEvent.KEYCODE_BACK ) {              if (adapter.getCheckedItemCount() > 0) {                cancleAll(adapter);                return true;            }                        }         return super.onKeyDown(keyCode, event);    }          private View createHeaderView() {        return LayoutInflater.from(this).inflate(R.layout.view_header, null);    }        private class MultiBaseAdapter extends MultiChoiceBaseAdapter{        private String[] mData;                /**         * 构造函数         * @param savedInstanceState         */        public MultiBaseAdapter(Bundle savedInstanceState,String[] data) {            super(savedInstanceState);            // TODO 自动生成的构造函数存根            mData = data;        }        @Override        public boolean onCreateActionMode(ActionMode mode, Menu menu) {            return true;        }                @Override        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {            return false;        }                        @Override        public boolean onPrepareActionMode(ActionMode arg0, Menu arg1) {            // TODO 自动生成的方法存根            return false;        }        /**         * 看适配器中有多少元素需要加载         */        @Override        public int getCount() {            // TODO 自动生成的方法存根            return mData.length;        }        /**         * 通过position来得到相应的item，这里返回object对象         */        @Override        public Object getItem(int position) {            // TODO 自动生成的方法存根            return mData[position];        }        /**         * 通过position得到id         */        @Override        public long getItemId(int position) {            // TODO 自动生成的方法存根            return position;        }        /**         * 返回item的view对象         */        @Override        protected View getViewImpl(int position, View convertView, ViewGroup parent) {            if (convertView == null) {                int layout = R.layout.item;                LayoutInflater inflater = LayoutInflater.from(getContext());                convertView = inflater.inflate(layout, parent, false);            }            ViewGroup group = (ViewGroup)convertView;            ((TextView)group.findViewById(R.id.item_textView)).setText(mData[position]);            ((CheckBox)group.findViewById(android.R.id.checkbox)).setVisibility(View.VISIBLE);            return group;        }                    }            public void buttonListener(View v) {        switch (v.getId()) {        case R.id.selectAll_button:            selectAll(adapter);            break;        case R.id.cancle_button:            cancleAll(adapter);            break;        case R.id.delete_button:            delectItems(adapter);            break;        case R.id.share_button:            Toast.makeText(getApplicationContext(), "分享"+Arrays.toString(getSelectedItems(adapter)), 1).show();            cancleAll(adapter);            break;        default:            break;        }    }        /**     * 全选     * @param adapter     */    private void selectAll(MultiChoiceBaseAdapter  adapter) {        for (int i = 0; i < adapter.getCount(); ++i) {            adapter.setItemChecked(i, true);        }    }        /**     * 取消所有选择效果     * @param adapter     */    private void cancleAll(MultiChoiceBaseAdapter  adapter) {        for (int i = 0; i < adapter.getCount(); ++i) {            adapter.setItemChecked(i, false);        }    }        /**     * 得到已经选中的items     * @param adapter     * @return     */    private String[] getSelectedItems(MultiChoiceBaseAdapter adapter) {        //得到选中的items        Set
     
       selection = adapter.getCheckedItems();        String[] items = new String[selection.size()];        int i = 0;        for (long position : selection) {            items[i++] = (String)adapter.getItem((int)position);        }        return items;    }        /**     * 删除已经选中的items     * @param adapter     */    private void delectItems(MultiChoiceBaseAdapter  adapter) {        //通过判断名字来remove掉这些items        // TODO:删除某些元素，因为这里的数据源是String[]所以没有链表那样好删除，就没去实现。        //实际中：推荐用链表来动态删除元素，在删除时需要注意的是最好以唯一的id，如position来进行删除        cancleAll(adapter);    }        /**     * @author:Jack Tony     * @tips  :点击事件的监听器     * @date  :2014-10-20     */    private class MyItemClick implements OnItemClickListener{        private MultiChoiceBaseAdapter mAdapter;                public MyItemClick(MultiChoiceBaseAdapter adapter) {            mAdapter = adapter;        }                @Override        public void onItemClick(AdapterView
       arg0, View arg1, int position, long arg3) {            //因为在顶部添加了2个视图，所以这里的位置要下移两位                        Toast.makeText(getApplicationContext(), "点击了: " + mAdapter.getItem(position - 2), Toast.LENGTH_SHORT).show();        }            }}