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

Myview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...

命名空间也直接叫myview了...代码
这个文件xml放在 value 下的 ***_attrs.xml 比如我这里去 haowuliaoa_attrs.xml
命名空间也直接叫myview了...代码
<?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

补充：移动开发 , Android ,