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作者：qiujuer
开源库：Genius-Android
转载请注明出处：http://blog.csdn.net/qiujuer/article/details/42399129
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序
就系统的 CheckBox 而言稍显累赘；原因无他，很多时候我们使用 CheckBox 只是为了能记录是否选中而已，很多时候用不到文字等复杂的布局。今天打造了一款 Material Design 风格的 CheckBox 控件，该控件简单，朴实，效率不错。
结构
在开始前，我们先看看系统的 CheckBox 的结构：
public class CheckBox extends CompoundButton
java.lang.Object
?android.widget.Button
?android.widget.CompoundButton
?android.widget.CheckBox
可以看出其继承关系是相当的....
今天打造一款直接继承 View 的 CheckBox ；当然直接继承，则会少去很多中间控件的属性，但是就我使用来看是值得的。
效果
分析
- 首先我们点击后需要绘制的地方无非就是两个地方：圆圈、圆弧
- 圆圈在动画开始的时候是颜色逐渐进行渐变
- 圆弧在动画开始的时候是在原有的圆弧上再绘制一个圆弧，圆弧的长度随着时间变化
- 由于是继承View所以enable和checked属性需要自己实现
- 同样Checked属性变化回掉依然需要自己实现
- 另外需要注意的是未实现Text属性，要的是简单，如需要可以自己绘制
代码
全局变量
private static final Interpolator ANIMATION_INTERPOLATOR = new DecelerateInterpolator();
private static final ArgbEvaluator ARGB_EVALUATOR = new ArgbEvaluator();
private static final int THUMB_ANIMATION_DURATION = 250;
private static final int RING_WIDTH = 5;
private static final int[] DEFAULT_COLORS = new int[]{
Color.parseColor("#ffc26165"), Color.parseColor("#ffdb6e77"),
Color.parseColor("#ffef7e8b"), Color.parseColor("#fff7c2c8"),
Color.parseColor("#ffc2cbcb"), Color.parseColor("#ffe2e7e7")};
public static final int AUTO_CIRCLE_RADIUS = -1;
我们定义了动画为逐渐变慢，颜色渐变，动画时间为 250 毫秒，圆弧宽度 5 像素，静态颜色（颜色其是是我的控件的属性，在这里就静态化了），圆心宽度默认值。
动画变量
// Animator
private AnimatorSet mAnimatorSet;
private float mSweepAngle;
private int mCircleColor;
private int mUnCheckedPaintColor = DEFAULT_COLORS[4];
private int mCheckedPaintColor = DEFAULT_COLORS[2];
private RectF mOval;
private Paint mCirclePaint;
private Paint mRingPaint;
动画类、圆弧角度，圆心颜色，两个是否选择颜色，用户画圆弧的RectF，两支画笔
动画形状
private float mCenterX, mCenterY;
private boolean mCustomCircleRadius;
private int mCircleRadius = AUTO_CIRCLE_RADIUS;
private int mRingWidth = RING_WIDTH;
所画的中心点XY，是否自定义圆心半径（如果有自定义切合法则使用自定义，否则使用运算后的半径），圆心半径（取决于运算与自定义的结合），圆弧宽度
基础属性
private boolean mChecked;
private boolean mIsAttachWindow;
private boolean mBroadcasting;
private OnCheckedChangeListener mOnCheckedChangeListener;
是否选择，是否AttachWindow用于控制是否开始动画，mBroadcasting用于控制避免重复通知回调，回调类
初始化
public GeniusCheckBox(Context context) {
super(context);
init(null, 0);
}
public GeniusCheckBox(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
}
public GeniusCheckBox(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(attrs, defStyle);
}
private void init(AttributeSet attrs, int defStyle) {
// Load attributes
boolean enable = isEnabled();
boolean check = isChecked();
if (attrs != null) {
// Load attributes
final TypedArray a = getContext().obtainStyledAttributes(
attrs, R.styleable.GeniusCheckBox, defStyle, 0);
// getting custom attributes
mRingWidth = a.getDimensionPixelSize(R.styleable.GeniusCheckBox_g_ringWidth, mRingWidth);
mCircleRadius = a.getDimensionPixelSize(R.styleable.GeniusCheckBox_g_circleRadius, mCircleRadius);
mCustomCircleRadius = mCircleRadius != AUTO_CIRCLE_RADIUS;
check = a.getBoolean(R.styleable.GeniusCheckBox_g_checked, false);
enable = a.getBoolean(R.styleable.GeniusCheckBox_g_enabled, true);
a.recycle();
}
// To check call performClick()
setOnClickListener(null);
// Refresh display with current params
refreshDrawableState();
// Init
initPaint();
initSize();
initColor();
// Init
setEnabled(enable);
setChecked(check);
}
private void initPaint() {
if (mCirclePaint == null) {
mCirclePaint = new Paint(ANTI_ALIAS_FLAG);
mCirclePaint.setStyle(Paint.Style.FILL);
mCirclePaint.setAntiAlias(true);
mCirclePaint.setDither(true);
}
if (mRingPaint == null) {
mRingPaint = new Paint();
mRingPaint.setStrokeWidth(mRingWidth);
mRingPaint.setStyle(Paint.Style.STROKE);
mRingPaint.setStrokeJoin(Paint.Join.ROUND);
mRingPaint.setStrokeCap(Paint.Cap.ROUND);
mRingPaint.setAntiAlias(true);
mRingPaint.setDither(true);
}
}
private void initSize() {
int paddingLeft = getPaddingLeft();
int paddingTop = getPaddingTop();
int paddingRight = getPaddingRight();
int paddingBottom = getPaddingBottom();
int contentWidth = getWidth() - paddingLeft - paddingRight;
int contentHeight = getHeight() - paddingTop - paddingBottom;
if (contentWidth > 0 && contentHeight > 0) {
int center = Math.min(contentHeight, contentWidth) / 2;
int areRadius = center - (mRingWidth + 1) / 2;
mCenterX = center + paddingLeft;
mCenterY = center + paddingTop;
if (mOval == null)
mOval = new RectF(mCenterX - areRadius, mCenterY - areRadius, mCenterX + areRadius, mCenterY + areRadius);
else {
mOval.set(mCenterX - areRadius, mCenterY - areRadius, mCenterX + areRadius, mCenterY + areRadius);
}
if (!mCustomCircleRadius)
mCircleRadius = center - mRingWidth * 2;
else if (mCircleRadius > center)
mCircleRadius = center;
// Refresh view
if (!isInEditMode()) {
invalidate();
}
}
}
private void initColor() {
if (isEnabled()) {
mUnCheckedPaintColor = DEFAULT_COLORS[4];
mCheckedPaintColor = DEFAULT_COLORS[2];
} else {
mUnCheckedPaintColor = DEFAULT_COLORS[5];
mCheckedPaintColor = DEFAULT_COLORS[3];
}
setCircleColor(isChecked() ? mCheckedPaintColor : mUnCheckedPaintColor);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// Init this Layout size
initSize();
}
初始化包括画笔、颜色、大小
另外初始化中除了实例化的时候会触发以外在 onMeasure 方法中有调用，目的是为了适应控件使用中变化时自适应。
在初始化大小中就进行了是否自定义判断，是否使用自定义值还是使用运算后的值，另外运算出 XY 坐标等操作；这些操作之所以不放在 onDraw() 中就是为了让动画尽量的流畅。
OnAttachWindow
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mIsAttachWindow = true;
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mIsAttachWindow = false;
}
这两个存在的目的就是为了在初始化的时候就开启动画的可能，因为动画是随着选中值变化而变化，所以需要排除未加载显示控件的情况下就开始动画的可能。
自定义设置
public void setRingWidth(int width) {
if (mRingWidth != width) {
mRingWidth = width;
mRingPaint.setStrokeWidth(mRingWidth);
initSize();
}
}
public void setCircleRadius(int radius) {
if (mCircleRadius != radius) {
if (radius < 0)
mCustomCircleRadius = false;
else {
mCustomCircleRadius = true;
mCircleRadius = radius;
}
initSize();
}
}
提供两个方法用于变量的设置，另外可以实现颜色的自定义。
回调接口
public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
mOnCheckedChangeListener = listener;
}
/**
* Interface definition for a callback to be invoked when the checked state
* of a compound button changed.
*/
public static interface OnCheckedChangeListener {
/**
* Called when the checked state of a compound button has changed.
*
* @param checkBox The compound button view whose state has changed.
* @param isChecked The new checked state of buttonView.
*/
void onCheckedChanged(GeniusCheckBox checkBox, boolean isChecked);
}
这里进行回掉接口的设计以及提供设置回掉的接口。
实现Checkable接口
/**
* Created by Qiujuer
* on 2014/12/29.
*/
public class GeniusCheckBox extends View implements Checkable{
@Override
public boolean performClick() {
toggle();
return super.performClick();
}
@Override
public void setEnabled(boolean enabled) {
if (enabled != isEnabled()) {
super.setEnabled(enabled);
initColor();
}
}
@Override
public boolean isChecked() {
return mChecked;
}
@Override
public void toggle() {
setChecked(!mChecked);
}
@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
public void setChecked(boolean checked) {
if (mChecked != checked) {
mChecked = checked;
refreshDrawableState();
// To Animator
if ((Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && isAttachedToWindow() && isLaidOut())
|| (mIsAttachWindow && mOval != null)) {
animateThumbToCheckedState(checked);
} else {
// Immediately move the thumb to the new position.
cancelPositionAnimator();
setCircleColor(checked ? mCheckedPaintColor : mUnCheckedPaintColor);
setSweepAngle(checked ? 360 : 0);
}
// Avoid infinite recursions if setChecked() is called from a listener
if (mBroadcasting) {
return;
}
mBroadcasting = true;
if (mOnCheckedChangeListener != null) {
mOnCheckedChangeListener.onCheckedChanged(this, checked);
}
mBroadcasting = false;
}
}
}
继承Checkable接口并实现它，另外在类中重写performClick()方法用于点击事件调用。
在实现的setChecked 方法中实现开启，取消动画操作。
动画部分
private void setSweepAngle(float value) {
mSweepAngle = value;
invalidate();
}
private void setCircleColor(int color) {
mCircleColor = color;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (isInEditMode()) {
initSize();
}
mCirclePaint.setColor(mCircleColor);
canvas.drawCircle(mCenterX, mCenterY, mCircleRadius, mCirclePaint);
if (mOval != null) {
mRingPaint.setColor(mUnCheckedPaintColor);
canvas.drawArc(mOval, 225, 360, false, mRingPaint);
mRingPaint.setColor(mCheckedPaintColor);
canvas.drawArc(mOval, 225, mSweepAngle, false, mRingPaint);
}
}
/**
* =============================================================================================
* The Animate
* =============================================================================================
*/
private void animateThumbToCheckedState(boolean newCheckedState) {
ObjectAnimator sweepAngleAnimator = ObjectAnimator.ofFloat(this, SWEEP_ANGLE, newCheckedState ? 360 : 0);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2)
sweepAngleAnimator.setAutoCancel(true);
ObjectAnimator circleColorAnimator = newCheckedState ? ObjectAnimator.ofObject(this, CIRCLE_COLOR, ARGB_EVALUATOR, mUnCheckedPaintColor, mCheckedPaintColor) :
ObjectAnimator.ofObject(this, CIRCLE_COLOR, ARGB_EVALUATOR, mCheckedPaintColor, mUnCheckedPaintColor);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2)
circleColorAnimator.setAutoCancel(true);
mAnimatorSet = new AnimatorSet();
mAnimatorSet.playTogether(
sweepAngleAnimator,
circleColorAnimator
);
// set Time
mAnimatorSet.setDuration(THUMB_ANIMATION_DURATION);
mAnimatorSet.setInterpolator(ANIMATION_INTERPOLATOR);
mAnimatorSet.start();
}
private void cancelPositionAnimator() {
if (mAnimatorSet != null) {
mAnimatorSet.cancel();
}
}
/**
* =============================================================================================
* The custom properties
* =============================================================================================
*/
private static final Property<GeniusCheckBox, Float> SWEEP_ANGLE = new Property<GeniusCheckBox, Float>(Float.class, "sweepAngle") {
@Override
public Float get(GeniusCheckBox object) {
return object.mSweepAngle;
}
@Override
public void set(GeniusCheckBox object, Float value) {
object.setSweepAngle(value);
}
};
private static final Property<GeniusCheckBox, Integer> CIRCLE_COLOR = new Property<GeniusCheckBox, Integer>(Integer.class, "circleColor") {
@Override
public Integer get(GeniusCheckBox object) {
return object.mCircleColor;
}
@Override
public void set(GeniusCheckBox object, Integer value) {
object.setCircleColor(value);
}
};
两个方法分别设置颜色与弧度，当弧度变化时触发 onDraw() 操作。
动画采用属性动画，并把属性动画打包为一个 Set 进行控制，弧度 0~360 之间变化；颜色就是选择与不选择颜色之间的变化。
自定义属性
<!-- GeniusCheckBox -->
<declare-styleable name="GeniusCheckBox">
<attr name="g_ringWidth" format="dimension" />
<attr name="g_circleRadius" format="dimension" />
<attr name="g_checked" format="boolean" />
<attr name="g_enabled" format="boolean" />
</declare-styleable>
成果
代码
xmlns:genius="http://schemas.android.com/apk/res-auto"
<!-- CheckBox -->
<net.qiujuer.genius.widget.GeniusTextView
android:id="@+id/title_checkbox"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="5dip"
android:layout_marginTop="10dip"
android:gravity="center_vertical"
android:maxLines="1"
android:text="CheckBox"
android:textSize="20sp"
genius:g_textColor="main" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dip"
android:paddingLeft="10dip"
android:paddingRight="10dip"
android:weightSum="2">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<net.qiujuer.genius.widget.GeniusTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dip"
android:gravity="center_vertical"
android:text="Enabled"
android:textSize="16dip"
genius:g_textColor="main" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"
android:orientation="vertical">
<net.qiujuer.genius.widget.GeniusCheckBox
android:id="@+id/checkbox_enable_blue"
android:layout_width="match_parent"
android:layout_height="24dp"
android:layout_gravity="center"
android:layout_margin="5dip"
genius:g_theme="@array/ScubaBlue" />
<net.qiujuer.genius.widget.GeniusCheckBox
android:id="@+id/checkbox_enable_strawberryIce"
android:layout_width="match_parent"
android:layout_height="24dp"
android:layout_gravity="center"
android:layout_margin="5dip"
genius:g_checked="true"
genius:g_ringWidth="2dp"
genius:g_theme="@array/StrawberryIce" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<net.qiujuer.genius.widget.GeniusTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dip"
android:gravity="center_vertical"
android:text="Disabled"
android:textSize="16dip"
genius:g_textColor="main" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dip"
android:orientation="vertical">
<net.qiujuer.genius.widget.GeniusCheckBox
android:id="@+id/checkbox_disEnable_blue"
android:layout_width="match_parent"
android:layout_height="24dp"
android:layout_gravity="center"
android:layout_margin="5dip"
genius:g_enabled="false"
genius:g_theme="@array/ScubaBlue" />
<net.qiujuer.genius.widget.GeniusCheckBox
android:id="@+id/checkbox_disEnable_strawberryIce"
android:layout_width="match_parent"
android:layout_height="24dp"
android:layout_gravity="center"
android:layout_margin="5dip"
genius:g_checked="true"
genius:g_enabled="false"
genius:g_ringWidth="2dp"
genius:g_theme="@array/StrawberryIce" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
效果
话说，写一篇这个好累的；光是写就花了我3个小时，汗！包括动画图片制作等。
总的源码太长就不贴出来了，上面已经拆分的弄出来了，如果要请点击这里。
——学之开源，用于开源；初学者的心态，与君共勉！
========================================================
作者：qiujuer
开源库：Genius-Android
转载请注明出处：http://blog.csdn.net/qiujuer/article/details/42399129
========================================================
时间： 2024-08-08 09:37:18