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Android实战之ListView复选框
网友分享于:Jan 1, 1970 8:00:00 AM    来源: IT货架   

标签:listview   viewholder   checkbox   复选框   

项目中有用到复选框的例子,啊啊......在网上查找有关资料,大多都是过于繁琐,所以自己决定写个这个方面的demo。。。

先给个效果图:

技术分享

在ListView中添加复选框主要注意以下几个问题:

1、ListView item与item中的控件抢焦点的问题(必须设置CheckBox不可点击和不能获取焦点,让ListView得到焦点)

2、ListView的setChoicMode(int choiceMode)选择模式():有choiceMode : CHOICE_MODE_NONE, CHOICE_MODE_SINGLE, or CHOICE_MODE_MULTIPLE分别是不可选、单选、多选

3、点击ListView item时,反转CheckBox的状态,mCheckBox.toggle();

说到这,可以知道ListView实现复选框的逻辑还是比较简单的,针对第一个问题,为什么需要让CheckBox失去焦点呢?因为像系统默认可点击的控件如Button、CheckBox、ImageButton等或者它们的子控件,相对其它默认不可点击的控件具有更高的优先级,所以在和其它控件一起使用中它们会优先获得焦点,所以如果不设置CheckBox失去焦点,那么ListView就不可点击了,只能点击CheckBox这个控件。

好了,直接贴一下代码吧:

这个方法就是显示一个ListView复选框:

private void showAllAppInfo() {
		View view = LayoutInflater.from(this).inflate(R.layout.show_appinfo,
				null);
		ListView mListView = (ListView) view
				.findViewById(R.id.show_appinfo_listview);
		Button mBtnCancel = (Button) view
				.findViewById(R.id.show_appinfo_cancel);
		Button mBtnSubmit = (Button) view
				.findViewById(R.id.show_appinfo_submit);
		final MyAdapter adapter = new MyAdapter();
		mListView.setAdapter(adapter);
		mListView.setItemsCanFocus(true);// 让item得到焦点,【注意】必须将ListView的item布局中的Checkbox控件失去焦点
		mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);// 设置多选模式
		mListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				ViewHolder holder = (ViewHolder) view.getTag();// 得到当前点击的View的ViewHolder对象
				holder.mCheckBox.toggle();// 当点击时设置相反的状态
				adapter.mCheckBoxSelected.put(position,
						holder.mCheckBox.isChecked());//修改Hashmap中对应位置Checkbox的选中情况
			}
		});
		Display display = getWindowManager().getDefaultDisplay();
		Point outSize = new Point();
		display.getSize(outSize);
		int width = outSize.x;
		int height = outSize.y;
		final PopupWindow pop = new PopupWindow(view, width * 3 / 4,
				height * 4 / 5, true);
		WindowManager.LayoutParams params = getWindow().getAttributes();
		params.alpha = 0.6f;
		getWindow().setAttributes(params);
		mBtnSubmit.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				StringBuffer sb = new StringBuffer();
				for (int i = 0; i < adapter.appInfoList.size(); i++) {
					// 循环遍历集合,得到选择item的信息
					if (adapter.mCheckBoxSelected.get(i)) {
						String selectedAppName = adapter.appInfoList.get(i)
								.getAppName();
						// Drawable selectedAppIcon = adapter.appInfoList.get(i).getAppIcon();
						sb.append(selectedAppName+",");
					}
				}
				pop.dismiss();
				Toast.makeText(getApplicationContext(), sb.toString(),
						Toast.LENGTH_SHORT).show();
			}
		});
		mBtnCancel.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				pop.dismiss();
			}
		});
		pop.setOnDismissListener(new OnDismissListener() {
			@Override
			public void onDismiss() {
				WindowManager.LayoutParams params = getWindow()
						.getAttributes();
				params.alpha = 1.0f;
				getWindow().setAttributes(params);
			}
		});
		pop.setBackgroundDrawable(new BitmapDrawable());
		pop.setOutsideTouchable(true);
		pop.setAnimationStyle(R.style.showPopupAnimation);
		pop.showAtLocation(view, Gravity.CENTER, 0, 0);
	}

重写适配器,Myadapter.java

public class MyAdapter extends BaseAdapter {
		public List<AppInfo> appInfoList;
		public HashMap<Integer, Boolean> mCheckBoxSelected;

		public MyAdapter() {
			appInfoList = getSystemAppInfo();
			mCheckBoxSelected = new HashMap<Integer, Boolean>();
			for (int i = 0; i < appInfoList.size(); i++) {
				mCheckBoxSelected.put(i, false);//初始化, 默认不选中
			}
		}

		@Override
		public int getCount() {
			return appInfoList.size();
		}

		@Override
		public Object getItem(int position) {

			return appInfoList.get(position);
		}

		@Override
		public long getItemId(int position) {
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ViewHolder viewHolder;
			if (convertView == null) {
				viewHolder = new ViewHolder();
				convertView = LayoutInflater.from(MainActivity.this).inflate(
						R.layout.listview_item, null, true);
				viewHolder.mImgAppIcon = (ImageView) convertView
						.findViewById(R.id.listview_item_img);
				viewHolder.mTvAppName = (TextView) convertView
						.findViewById(R.id.listview_item_tv);
				viewHolder.mCheckBox = (CheckBox) convertView
						.findViewById(R.id.listview_item_cbx);
				convertView.setTag(viewHolder);
			} else {
				viewHolder = (ViewHolder) convertView.getTag();
			}
			viewHolder.mImgAppIcon.setImageDrawable(appInfoList.get(position)
					.getAppIcon());
			viewHolder.mTvAppName.setText(appInfoList.get(position)
					.getAppName());
			viewHolder.mCheckBox.setChecked(mCheckBoxSelected.get(position));
			return convertView;
		}

	}

ViewHolder类:

public final static class ViewHolder {
		ImageView mImgAppIcon;
		TextView mTvAppName;
		CheckBox mCheckBox;
	}

得到系统内非系统app:

// 得到非系统应用列表
	private List<AppInfo> getSystemAppInfo() {
		List<AppInfo> list = new ArrayList<AppInfo>();
		List<PackageInfo> packages = this.getPackageManager()
				.getInstalledPackages(0);
		AppInfo appInfo = null;
		for (PackageInfo temp : packages) {
			if ((temp.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
				// 非系统应用
				String appName = (String) temp.applicationInfo
						.loadLabel(getPackageManager());
				Drawable appIcon = temp.applicationInfo
						.loadIcon(getPackageManager());
				appInfo = new AppInfo(appIcon, appName);
				list.add(appInfo);
				appInfo = null;
			} else {
				// 系统应用
			}
		}
		return list;
	}



当然还有一个JavaBean类:AppInfo.java,这个类的代码就不贴了。


源码下载请戳:http://download.csdn.net/detail/u010687392/8702343
大笑大笑大笑


Android实战之ListView复选框

标签:listview   viewholder   checkbox   复选框   

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