android WheelView组件(滑轮组件)的使用

?android前段组件中， 填表单，选择条目 的样式有很多， WheelView滚动组件为其中一种，如下图所示：

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?前两种大家很多都用过，? 不过我修改了一下，弄出第三种，希望能帮助到大家：
贴代码：

EditText category = (EditText) findViewById(R.id.editCategory);category.setOnClickListener(listener);private OnClickListener listener = new OnClickListener() {		@Override		public void onClick(View v) {			// 创建会话框			final AlertDialog dialog = new AlertDialog.Builder(					Set_accountActivity.this).create();			dialog.setTitle("消费类别：");			// 创建布局			final LinearLayout ll = new LinearLayout(Set_accountActivity.this);			// 设置布局方式：水平			ll.setOrientation(LinearLayout.HORIZONTAL);			final WheelView category1 = new WheelView(Set_accountActivity.this);			category1.setVisibleItems(5);			category1.setCyclic(true);			category1.setAdapter(new ArrayWheelAdapter<String>(category_str1));			final WheelView category2 = new WheelView(Set_accountActivity.this);			category2.setVisibleItems(5);			category2.setCyclic(true);			category2					.setAdapter(new ArrayWheelAdapter<String>(category_str2[0]));			// 创建参数			LinearLayout.LayoutParams lp1 = new LinearLayout.LayoutParams(					LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);			lp1.gravity = Gravity.LEFT;			//lp1.weight = (float) 0.6;			LinearLayout.LayoutParams lp2 = new LinearLayout.LayoutParams(					LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);			lp2.weight = (float) 0.6;			lp2.gravity = Gravity.RIGHT;			lp2.leftMargin = 10;			ll.addView(category1, lp1);			ll.addView(category2, lp2);			// 为category1添加监听			category1.addChangingListener(new OnWheelChangedListener() {				public void onChanged(WheelView wheel, int oldValue,						int newValue) {					category2.setAdapter(new ArrayWheelAdapter<String>(							category_str2[newValue]));					category2							.setCurrentItem(category_str2[newValue].length / 2);				}			});			// 为会话创建确定按钮			dialog.setButton("确定", new DialogInterface.OnClickListener() {				@Override				public void onClick(DialogInterface dialog, int which) {					String cat1 = category_str1[category1.getCurrentItem()];					String cat2 = category_str2[category1.getCurrentItem()][category2							.getCurrentItem()];					category.setText(cat1 + ">>" + cat2);					dialog.dismiss();				}			});			dialog.setButton2("取消", new DialogInterface.OnClickListener() {				@Override				public void onClick(DialogInterface dialog, int which) {					dialog.dismiss();				}			});			dialog.setView(ll);			dialog.show();		}	};

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?这个组件一般适用于前段选择固有项目 ， 核心代码是写好的，大家去搜索一下把源码下载下来就可以了；

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