转载请注明出处:http://blog.csdn.net/zhaokaiqiang1992
ActionMode是3.0之后,官方推荐的一种上下文菜单的实现方式,在之前一直用的是Context Menu,今天这篇文章简单介绍一下ActionMode,并实现多选删除功能。
如果要在ListView这类控件中实现多选,我们可以通过设置setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL)来实现,然后通过设置setMultiChoiceModeListener之后,就可以开启ActionMode。ActionMode并不是一个View,只是一个操作模式,所以我们用的时候不能按照View的用法来使用。
下面是实现的效果图
这个和GMail的删除是不是很像?
因为ActionMode没有多少知识点要说,咱们就简单介绍下,然后上代码,这个功能主要其实主要是逻辑麻烦点,也很简单。
设置完多选模式监听器之后,我们需要实现下面的方法
mListView.setMultiChoiceModeListener(new MultiChoiceModeListener(){ @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { // TODO Auto-generated method stub return false; } @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { // TODO Auto-generated method stub return false; } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { // TODO Auto-generated method stub return false; } @Override public void onDestroyActionMode(ActionMode mode) { // TODO Auto-generated method stub } @Override public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) { // TODO Auto-generated method stub } });
在onCreateActionMode()中,一般实现ActionMode下右侧的MenuItem配置,和标题设置,比如像下面这样
@Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { // 在进入ActionMode的时候调用 MenuInflater inflater = mode.getMenuInflater(); inflater.inflate(R.menu.menu_delete, menu); mode.setTitle("Delete"); isInActionMode = true; isInDeleteMode = false; return true; }
@Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { // 当listview中的item被点击的时候调用 if (item.getItemId() == R.id.action_delete) { mAnimateDismissAdapter.animateDismiss(mCheckedPositions); isInDeleteMode = true; mode.finish(); return true; } return false; }
基本这几个方法就基本满足我们的功能了,下面是完整的示例代码
package com.imooc.multychoice; import java.util.ArrayList; import java.util.Iterator; import android.app.Activity; import android.os.Bundle; import android.view.ActionMode; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.AbsListView.MultiChoiceModeListener; import android.widget.BaseAdapter; import android.widget.CheckBox; import android.widget.ListView; import android.widget.TextView; import com.haarman.listviewanimations.itemmanipulation.AnimateDismissAdapter; import com.haarman.listviewanimations.itemmanipulation.OnDismissCallback; import com.imooc.multychoice.R; public class MainActivity extends Activity { protected static final String TAG = "TAG"; private ListView mListView; private MultyAdapter mAdapter; // 是否处于ActionMode模式 private boolean isInActionMode; private boolean isInDeleteMode = false; private AnimateDismissAdapter<Model> mAnimateDismissAdapter; private ArrayList<Integer> mCheckedPositions; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView) findViewById(R.id.lv); mAdapter = new MultyAdapter(); mCheckedPositions = new ArrayList<Integer>(); mAnimateDismissAdapter = new AnimateDismissAdapter<MainActivity.Model>( mAdapter, new MyDismissCallBack()); mAnimateDismissAdapter.setAbsListView(mListView); mListView.setAdapter(mAnimateDismissAdapter); mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL); mListView.setMultiChoiceModeListener(new MultiChoiceModeListener() { @Override public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; } @Override public void onDestroyActionMode(ActionMode mode) { // 在退出ActionMode的时候调用,如果处于删除状态,就删除选中的数据, // 否则,重置所有选中的状态 if (!isInDeleteMode) { for (Model model : mAdapter.models) { model.setChecked(false); } mCheckedPositions.clear(); } isInActionMode = false; } @Override public boolean onCreateActionMode(ActionMode mode, Menu menu) { // 在进入ActionMode的时候调用 MenuInflater inflater = mode.getMenuInflater(); inflater.inflate(R.menu.menu_delete, menu); mode.setTitle("Delete"); isInActionMode = true; isInDeleteMode = false; return true; } @Override public boolean onActionItemClicked(ActionMode mode, MenuItem item) { // 当listview中的item被点击的时候调用 if (item.getItemId() == R.id.action_delete) { mAnimateDismissAdapter.animateDismiss(mCheckedPositions); isInDeleteMode = true; mode.finish(); return true; } return false; } @Override public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) { // 当item的选中状态被选中的时候调用 mAdapter.models.get(position).setChecked(checked); mAdapter.notifyDataSetChanged(); mode.setSubtitle(mListView.getCheckedItemCount() + " item selected"); if (mCheckedPositions.contains(position) && !checked) { mCheckedPositions.remove(Integer.valueOf(position)); } else { mCheckedPositions.add(position); } } }); } private class MultyAdapter extends BaseAdapter { private ArrayList<Model> models; public MultyAdapter() { models = new ArrayList<Model>(); for (int i = 0; i < 20; i++) { models.add(new Model("I'm " + i)); } } @Override public int getCount() { return models.size(); } @Override public Model getItem(int position) { return models.get(position); } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder viewHolder; Model model = mAdapter.models.get(position); if (convertView == null) { convertView = getLayoutInflater().inflate( R.layout.item_multy_choice, parent, false); viewHolder = new ViewHolder(); viewHolder.tv = (TextView) convertView.findViewById(R.id.tv); viewHolder.chb = (CheckBox) convertView.findViewById(R.id.chb); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); } viewHolder.tv.setText(model.getTitle()); viewHolder.chb.setChecked(model.isChecked()); viewHolder.chb.setVisibility(isInActionMode ? View.VISIBLE : View.GONE); return convertView; } } private static class ViewHolder { TextView tv; CheckBox chb; } /** * 测试Model * * @author zhaokaiqiang * */ private class Model { private String title; private boolean isChecked; public Model(String title) { this.title = title; isChecked = false; } public String getTitle() { return title; } public boolean isChecked() { return isChecked; } public void setChecked(boolean isChecked) { this.isChecked = isChecked; } } private class MyDismissCallBack implements OnDismissCallback { @Override public void onDismiss(AbsListView arg0, int[] arg1) { mCheckedPositions.clear(); Iterator<Model> iterator = mAdapter.models.iterator(); while (iterator.hasNext()) { if (iterator.next().isChecked()) { // 删除选中的元素 iterator.remove(); } } mAdapter.notifyDataSetChanged(); } } }
下载地址:https://github.com/ZhaoKaiQiang/MultyChoiceDemo