Android 自定义View 标识当前选中的控件

   一值有在用网上朋友贴出来的代码,很方便,也能学到很多东西.  这次我也贴点比较简单使用的小东西. 不怎么形容  有图有代码  自己看真想...

 

主体代码

 

package com.suncco.taoxie;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

public class MyView extends View {
	private int count;
	private float space, radii;
	private int point_normal_color, point_seleted_color;

	// 选中
	private int selected = 0;

	// background seleted normal

	public MyView(Context context, AttributeSet attrs) {
		super(context, attrs);
		TypedArray a = context
				.obtainStyledAttributes(attrs, R.styleable.MyView);

		count = a.getInteger(R.styleable.MyView_count, 3);
		space = a.getDimension(R.styleable.MyView_space, 9);
		radii = a.getDimension(R.styleable.MyView_point_radii, 9);

		point_normal_color = a.getColor(R.styleable.MyView_point_normal_color,
				0x000000);
		point_seleted_color = a.getColor(
				R.styleable.MyView_point_seleted_color, 0xffff07);

		int sum = attrs.getAttributeCount();
		a.recycle();
	}

	public void setCount(int count) {
		this.count = count;
		invalidate();
	}

	public void next() {
		if (selected < count - 1)
			selected++;
		else
			selected = 0;
		invalidate();
	}

	public void previous() {
		if (selected > 0)
			selected--;
		else
			selected = count - 1;
		invalidate();
	}

	@Override
	protected void onDraw(Canvas canvas) {
		Paint paint = new Paint();
		paint.setAntiAlias(true);
		// 起始位置,实现整体居中
		float w = canvas.getWidth() - (count * 2 * radii) - space * (count - 1);

		for (int i = 0; i < count; i++) {
			if (i == selected)
				paint.setColor(point_seleted_color);
			else
				paint.setColor(point_normal_color);
			canvas.drawCircle(w / 2.f + radii + i * (space + radii + radii),
					radii + 1, ((int) radii + 2) / 2, paint);
		}
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
		setMeasuredDimension(widthMeasureSpec, (int) (radii * 2) + 2);
	}

	public void setSelected(int selectedId) {
		if (selectedId >= 0 && selectedId <= count)
			this.selected = selectedId;
		else if (selectedId < 0)
			this.selected = 0;
		else if (selectedId > count)
			this.selected = count;
		invalidate();
	}

}

 

自定义View 的自定义命名空间:

以下自定义属性  count: 总数, space: 每个点的距离大小之类的等等 名字取得都比较通俗了...

 

这个文件xml放在 value 下的  ***_attrs.xml  比如我这里去  haowuliaoa_attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
	<declare-styleable name="MyView">
		<attr name="count" format="integer" />  
		<attr name="space" format="dimension" />
		<attr name="point_size" format="dimension" />
		<attr name="point_seleted_color" format="color|reference" />
		<attr name="point_normal_color" format="color|reference" />
		<attr name="point_radii" format="dimension" />
	</declare-styleable>
</resources>

 

 

一切ok了, 可以直接在xml布局上应用咯...

 

 

首先要在布局的头 添加上自己的命名空间
xmlns:haowuliaoa="http://schemas.android.com/apk/res/自己的包名"

然后就是xml布局咯...

<包名.MyView android:id="@+id/myView"
	android:layout_width="fill_parent" android:layout_height="10dip"
	android:background="#00000000" android:gravity="center"
	android:layout_marginBottom="4dip" haowuliaoa_attrs:count="6" suncco:space="10dip"
	haowuliaoa_attrs:point_size="4dip" haowuliaoa_attrs:point_seleted_color="#ff0000"
	haowuliaoa_attrs:point_normal_color="#ffffff" haowuliaoa_attrs:point_radii="5dip" />

 

so 简单吧....

图片下面的小点就是今天的效果哦 很常用的

功能却是经常能用到的哦  ...