Android学习笔记-自定义view

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在android开发中有时会找不到想要的控件样式，这时就需要自定义view了。
首先看一下自定义view的进本步骤：

继承view，重写onMeasure(),onDraw()方法
建立atts.xml文件

自定义view

public class ToggleButton extends View {    Bitmap background;    Bitmap toggle;    Paint bgOpenPaint;    Paint bgClosePaint;    Paint tgPaint;    int width;    int height;    float current;    private boolean status=true;    boolean isMove=false;    public ToggleButton(Context context) {        super(context);    }    public ToggleButton(Context context, AttributeSet attrs) {        super(context, attrs);       // ToggleButton(context,attrs,0);        TypedArray a = context.obtainStyledAttributes(attrs,                R.styleable.ToggleButton);        int bgOpenColor=a.getColor(R.styleable.ToggleButton_bgOpenColor,0x0000ff);        int bgCloseColor=a.getColor(R.styleable.ToggleButton_bgCloseColor,0xcccccc);        int tgColor=a.getColor(R.styleable.ToggleButton_tgColor,0xffffff);        bgOpenPaint=new Paint();        bgOpenPaint.setColor(bgOpenColor);        bgClosePaint=new Paint();        bgClosePaint.setColor(bgCloseColor);        tgPaint=new Paint();        tgPaint.setColor(tgColor);    }    public ToggleButton(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onDraw(Canvas canvas) {        if (status) {            canvas.drawCircle(height / 2, height / 2, height / 2, bgOpenPaint);            canvas.drawRect(height / 2, 0, width - height, height, bgOpenPaint);            canvas.drawCircle(width - height, height / 2, height / 2, bgOpenPaint);        } else {            canvas.drawCircle(height / 2, height / 2, height / 2, bgClosePaint);            canvas.drawRect(height / 2, 0, width - height, height, bgClosePaint);            canvas.drawCircle(width - height, height / 2, height / 2, bgClosePaint);        }        if(isMove){            float x;            if(current<height/2){                x=height/2;            }            else if(current>width-height){                x=width-height;            }            else{                x=current;            }            canvas.drawCircle(x,height/2,height/2,tgPaint);        }        else{            if(status){                canvas.drawCircle(width - height, height / 2, height / 2, tgPaint);            }            else{                canvas.drawCircle(height/2, height / 2, height / 2, tgPaint);            }        }       // canvas.drawCircle();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {      //  super.onMeasure(widthMeasureSpec, heightMeasureSpec);        width=MeasureSpec.getSize(widthMeasureSpec);        height=MeasureSpec.getSize(heightMeasureSpec);        setMeasuredDimension(width,height);    }    /**     * 根据手势重绘view     * @param event     * @return     */    @Override    public boolean onTouchEvent(MotionEvent event) {        current=event.getX();        if(current>width/2)            status=true;        else            status=false;        switch (event.getAction()){            case MotionEvent.ACTION_DOWN:                isMove=true;                break;            case MotionEvent.ACTION_UP:                isMove=false;                break;            case MotionEvent.ACTION_MOVE:                break;        }        invalidate();        return true;    }}

attrs.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="ToggleButton">        <attr name="bgOpenColor" format="color"/>        <attr name="bgCloseColor" format="color"/>        <attr name="tgColor" format="color"/>    </declare-styleable></resources>

在上面的代码中只实现了基本的功能，更多功能可以根据需求自己添加

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