【Android】功能模块化之ListView中CheckBox批量操作

ListView加载CheckBox，在进行全选操作时，或全选状态下，勾选ListView中Item的CheckBox时，全选状态没有改变之类的情况。

ListView中itemCheckBox与全选AllCheckBox存在以下关联：

（1）AllCheckBox选中状态与未选中状态下，itemCheckBox随之变化；

（2）itemCheckBox未选中时，应AllCheckBox为未选中状态；

（3）itemCheckBox选中时，需判断ListView中所有的checkbox是否处于选中状态，若为选中状态，则将AllCheckBox状态改为选中，否则为未选中状态。

解决思路：

（1）在Adapter存下每个checkBox的状态；

（2）通过AllCheckBox状态改变itemCheckBox状态；

（3）通过判断Adapter中所有checkbox的选中状态，去更新AllCheckBox状态；

（4）使用Handler更新AllCheckBox状态。

实现代码：

1）定义ListView的item.xml

 

2）定义ListView的Adapter，以下为一些关键的源代码

 

2.1）定义变量

 

	private HashMap isSelected = null;//存储checkbox状态

 private Handler statusHandler = null;//更新AllCheckBox的handler

private class ViewHolder {TextView tvTime, tvPlace, tvMoney;CheckBox cbSelect;}

2.2)定义判断全选状态的方法

 

 

	private boolean isAllSelected() {
		for (int i = 0; i < isSelected.size(); i++) {
			if (!isSelected.get(i)) {
				return false;
			}
		}
		return true;
	}

2.3)定义选择checkBox方法

 

public void select(int potision, boolean isChecked) {
		isSelected.put(potision, isChecked);//记录下当前checkBox的状态
		Message msg = statusHandler.obtainMessage();
		if (isChecked) {
			if (isAllSelected()) {
				msg.what = MainActivity.ALL_SELECTED_CHECK;//将AllCheckbox状态改为选中
			} else {
				msg.what = MainActivity.NOT_ALL_SELECTED_CHECK;//将AllCheckBox改成未选中
			}
		} else {
			msg.what = MainActivity.NOT_ALL_SELECTED_CHECK;//将AllCheckBox改成未选中
}
statusHandler.sendMessage(msg);
}

2.4)定义getView

 

@Override
	public View getView(final int position, View convertView, ViewGroup parent) {
		ViewHolder viewHolder;
		if (convertView == null) {
			LayoutInflater mInflater = LayoutInflater.from(context);
			convertView = mInflater.inflate(R.layout.list_item_vios, null);
			viewHolder = new ViewHolder();
			viewHolder.tvMoney = (TextView) convertView
					.findViewById(R.id.tv_money);
			viewHolder.tvPlace = (TextView) convertView
					.findViewById(R.id.tv_place);
			viewHolder.tvTime = (TextView) convertView
					.findViewById(R.id.tv_time);
			viewHolder.cbSelect = (CheckBox) convertView
					.findViewById(R.id.cb_select);
			convertView.setTag(viewHolder);
		} else {
			viewHolder = (ViewHolder) convertView.getTag();
		}
		viewHolder.cbSelect
				.setOnCheckedChangeListener(new OnCheckedChangeListener() {

					@Override
					public void onCheckedChanged(CompoundButton buttonView,
							boolean isChecked) {
						select(position, isChecked);
					}
				});
		Boolean isChecked = isSelected.get(position);
		if (null == isChecked) {
			isChecked = false;
		}
		ViolationEntity violationEntity = violationEntities.get(position);
		viewHolder.tvMoney.setText(violationEntity.getBenjin());
		viewHolder.tvPlace.setText(violationEntity.getWfdd());
		viewHolder.tvTime.setText(violationEntity.getWfsj());
		viewHolder.cbSelect.setChecked(isChecked);
		return convertView;
	}

2.5）定义Adapter构造函数

 

 

public ViosAdapter(Context context,
			ArrayList violationEntities,
			final Handler statusHandler) {
		this.context = context;
		isSelected = new HashMap();
		this.violationEntities = new ArrayList();
		this.violationEntities = violationEntities;
		this.statusHandler = statusHandler;
		initSelectAll(false);//初始化全部checkBox的状态
	}

3）定义MainActivity中AllCheckBox相应操作

 

3.1）定义handler常量

 

public static final int ALL_SELECTED_CHECK = 0x0000;//更新AllCheckBox为选中

	public static final int NOT_ALL_SELECTED_CHECK = 0x0001;//更新AllCheckBox为未选中

	public static final int UPDATE_ALL_CHECKBOX = 0x0002;//更新itemCheckBox状态

private boolean updateAllCheckBox = true;//区分是AllCheckBox点击改变状态还是由itemCheckBox改变AllCheckBox状态

3.2）定义AllCheckBox监听函数

cbAllSelected.setOnCheckedChangeListener(new OnCheckedChangeListener() {

			@Override
			public void onCheckedChanged(CompoundButton buttonView,
					boolean isChecked) {
				if (updateAllCheckBox) {//如果是点击时，则更新Adapter中所有checkBox的状态
					Message msg = statusHandler.obtainMessage();
					msg.what = UPDATE_ALL_CHECKBOX;
					msg.obj = isChecked;
					statusHandler.sendMessage(msg);
				}
			}
		});

4)定义更新数据的Handler

 

 

private Handler statusHandler = new Handler() {
		public void handleMessage(android.os.Message msg) {
			switch (msg.what) {
			case ALL_SELECTED_CHECK:
				updateAllCheckBox = false;
				cbAllSelected.setChecked(true);
				updateAllCheckBox = true;
				break;
			case NOT_ALL_SELECTED_CHECK:
				updateAllCheckBox = false;
				cbAllSelected.setChecked(false);
				updateAllCheckBox = true;
				break;
			case UPDATE_ALL_CHECKBOX:
				((ViosAdapter) lvVios.getAdapter()).selectAll(Boolean
						.parseBoolean(String.valueOf(msg.obj)));
				break;
			default:
				break;
			}
		};
	};

5)初始化Adapter，ListView加载Adapter

 

 

		lvVios = (ListView) findViewById(R.id.ll_vios);
		viosAdapter = new ViosAdapter(this,
			violationEntities, statusHandler);
		lvVios.setAdapter(viosAdapter);