Android(安卓)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 normalpublic 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++;elseselected = 0;invalidate();}public void previous() {if (selected > 0)selected--;elseselected = count - 1;invalidate();}@Overrideprotected 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);elsepaint.setColor(point_normal_color);canvas.drawCircle(w / 2.f + radii + i * (space + radii + radii),radii + 1, ((int) radii + 2) / 2, paint);}}@Overrideprotected 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 ...

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