陷入自定義view的坑越陷越深,勵志要把自定義view擼給遍,今天給你們介紹一下自定義view————開關button,這個在不少app中都能用的,廢話很少說,先來給動圖。android
分析一下上面的效果:四個狀態:關閉狀態、關閉->打開過程、打開狀態、打開->關閉過程,結合ValueAnimator動效實現這個過程git
繪製一個圓角矩形(drawRoundRect()方法),再畫一個圓(drawCircle()),默認關閉就畫好了github
RectF rectF = new RectF(padding, padding, mwidth - padding, mheight - padding);
//先畫背景
canvas.drawRoundRect(rectF, backgroundRadius, backgroundRadius, closePaint);
//再畫圓
canvas.drawCircle(closecenterX, closecenterY, circleRadius, circlePaint);複製代碼
繪製了關閉狀態,再繪製打開狀態,,最後繪製關閉->打開狀態,打開->關閉狀態,其實這裏和關閉狀態相似的,只是畫圓的x、y的位置不同而已canvas
RectF rectF = new RectF(padding, padding, mwidth - padding, mheight - padding);
//先畫背景
canvas.drawRoundRect(rectF, backgroundRadius, backgroundRadius, closePaint);
RectF rectFAnimation = new RectF(padding, padding, o2cright, o2cbottom);
//先畫背景
canvas.drawRoundRect(rectFAnimation, backgroundRadius, backgroundRadius, openPaint);
//再畫圓
canvas.drawCircle(o2ccenterX, o2ccenterY, circleRadius, circlePaint);複製代碼
ValueAnimator動效中的addUpdateListener()的回調經過valueAnimator.getAnimatedValue();來從新繪製過程,計算圓在狀態變化時的x,y及其圓角矩形的right,bottom值來動態改變而後從新繪製。bash
記錄動態的變化值 服務器
close2OpengvalueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
mclose2OpenAnimatorValue = (float) valueAnimator.getAnimatedValue();
//圓在狀態變化時的x,y
c2ocenterX = closecenterX + closeOpenX * mclose2OpenAnimatorValue;
c2ocenterY = backgroundRadius + padding;
//背景的右下標=關閉狀態的位置(2*backgroundRadius+padding)+差值*變化
c2oright = 2 * backgroundRadius + padding + closeOpenRight * mclose2OpenAnimatorValue;
//背景的底下標=關閉狀態的位置(2*backgroundRadius+padding)+差值*變化
c2obottom = 2 * backgroundRadius + padding + closeOpenBottom * mclose2OpenAnimatorValue;
invalidate();
}
});
close2OpengvalueAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
}
@Override
public void onAnimationEnd(Animator animator) {
setOpen();
invalidate();
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});複製代碼
根據變化值從新繪製app
RectF rectF = new RectF(padding, padding, mwidth - padding, mheight - padding);
//先畫背景
canvas.drawRoundRect(rectF, backgroundRadius, backgroundRadius, closePaint);
RectF rectFAnimation = new RectF(padding, padding, c2oright, c2obottom);
//先畫背景
canvas.drawRoundRect(rectFAnimation, backgroundRadius, backgroundRadius, openPaint);
//再畫圓
canvas.drawCircle(c2ocenterX, c2ocenterY, circleRadius, circlePaint);複製代碼
這個動畫狀態和上面的動畫狀態同理ide
記錄變化值動畫
openg2ClosevalueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
mopeng2CloseAnimatorValue = (float) valueAnimator.getAnimatedValue();
//圓在狀態變化時的x,y
o2ccenterX = closecenterX+closeOpenX * mopeng2CloseAnimatorValue;
o2ccenterY = backgroundRadius + padding;
//背景的右下標=關閉狀態的位置(2*backgroundRadius+padding)+差值*變化
o2cright = 2 * backgroundRadius + padding + closeOpenRight * mopeng2CloseAnimatorValue;
//背景的底下標=關閉狀態的位置(2*backgroundRadius+padding)+差值*變化
o2cbottom = 2 * backgroundRadius + padding + closeOpenBottom * mopeng2CloseAnimatorValue;
invalidate();
}
});
openg2ClosevalueAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
}
@Override
public void onAnimationEnd(Animator animator) {
setClose();
invalidate();
}
@Override
public void onAnimationCancel(Animator animator) {
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});複製代碼
根據變化值從新繪製ui
RectF rectF = new RectF(padding, padding, mwidth - padding, mheight - padding);
//先畫背景
canvas.drawRoundRect(rectF, backgroundRadius, backgroundRadius, closePaint);
RectF rectFAnimation = new RectF(padding, padding, o2cright, o2cbottom);
//先畫背景
canvas.drawRoundRect(rectFAnimation, backgroundRadius, backgroundRadius, openPaint);
//再畫圓
canvas.drawCircle(o2ccenterX, o2ccenterY, circleRadius, circlePaint);複製代碼
上面的四種狀態介紹完畢了,大體功能就實現了,接下來介紹一些屬性的設置、四種狀態設置的方法、點擊事件等
/***
* 關閉
*/
private void setClose() {
mcurrentState = State.CLOSE;
invalidate();
}
/***
* 打開
*/
private void setOpen() {
mcurrentState = State.OPEN;
invalidate();
}
/***
* 關閉到打開
*/
private void setClose2Open() {
mcurrentState = State.CLOSE2OPEN;
openg2ClosevalueAnimator.removeAllUpdateListeners();
addCloseToOpenAnimator();
close2OpengvalueAnimator.start();
}
/***
* 打開到關閉
*/
private void setOpen2Close() {
mcurrentState = State.OPEN2CLOSE;
close2OpengvalueAnimator.removeAllUpdateListeners();
addOpenToCloseAnimator();
openg2ClosevalueAnimator.start();
}複製代碼
/***
* 控件點擊執行該方法 改變狀態
*/
public void onclick(){
if(mcurrentState==State.CLOSE){
setClose2Open();
}else if(mcurrentState==State.OPEN){
setOpen2Close();
}
}複製代碼
attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="SwitchButton">
<attr name="backgroudColor" format="color"/>
<attr name="closeColor" format="color"/>
<attr name="openColor" format="color"/>
<attr name="circleColor" format="color"/>
<attr name="animatorTime" format="integer"/>
<attr name="padding" format="integer"/>
</declare-styleable>
</resources>複製代碼
private void initTypeArray(Context context, AttributeSet attrs) {
TypedArray typedArray=context.obtainStyledAttributes(attrs,R.styleable.SwitchButton);
backgroudColor=typedArray.getColor(R.styleable.SwitchButton_backgroudColor,Color.WHITE);
closeColor=typedArray.getColor(R.styleable.SwitchButton_closeColor,Color.GRAY);
openColor=typedArray.getColor(R.styleable.SwitchButton_openColor,Color.GREEN);
circleColor=typedArray.getColor(R.styleable.SwitchButton_circleColor,Color.WHITE);
padding=typedArray.getInteger(R.styleable.SwitchButton_padding,1);
animatorTime=typedArray.getInteger(R.styleable.SwitchButton_animatorTime,500);
typedArray.recycle();
}複製代碼
xml中設置
<com.switchbutton.SwitchButton
android:id="@+id/btn1"
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_marginTop="20dp"
app:closeColor="@color/colorAccent"
app:openColor="@android:color/holo_green_light"
app:padding="6"
app:animatorTime="1000"
/>複製代碼
/**
* 設置背景顏色
* @param backgroudColor
*/
public void setBackgroudColor(int backgroudColor) {
this.backgroudColor = backgroudColor;
}
/**
* 關閉狀態顏色
* @param closeColor
*/
public void setCloseColor(int closeColor) {
this.closeColor = closeColor;
closePaint.setColor(closeColor);
}
/**
* 打開狀態顏色
* @param openColor
*/
public void setOpenColor(int openColor) {
this.openColor = openColor;
openPaint.setColor(openColor);
}
/**
* 圓的顏色
* @param circleColor
*/
public void setCircleColor(int circleColor) {
this.circleColor = circleColor;
circlePaint.setColor(circleColor);
}
/**
* 間距
* @param padding
*/
public void setPadding(int padding) {
this.padding = padding;
}
/**
* 動畫時間
* @param animatorTime
*/
public void setAnimatorTime(int animatorTime) {
this.animatorTime = animatorTime;
}複製代碼
/**
* 獲取當前的狀態 用於使用時的需求
* @return
*/
public State getMcurrentState() {
return mcurrentState;
}複製代碼
其餘方法也能夠實現,根據本身的需求去作相應的更改