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之前一直用facebook开源的ToggleButton个小组件，喜欢这个效果。为了更简单的使用，就写了类似的动画。
预览图:
代码：
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.AccelerateInterpolator;import cn.demomaster.huan.quickdeveloplibrary.R;
import cn.demomaster.huan.quickdeveloplibrary.annotation.ResType;/*** Created by Squirrel桓 on 2018/12/17.*/public class ToggleButton extends View {public ToggleButton(Context context) {super(context);init();}public ToggleButton(Context context, @Nullable AttributeSet attrs) {super(context, attrs);init();}public ToggleButton(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init();}private boolean isCheckedDef = false;public void init() {setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View view) {setChecked(!checked);}});setChecked(isCheckedDef);}public void setChecked(boolean checked) {this.checked = checked;startAnimation(checked);if (onToggleChangeListener != null) {onToggleChangeListener.onToggle(checked);}}private int center_x, center_y, mwidth, width, height;@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);width = w;height = h;center_x = width / 2;}private boolean checked = true;private int circle_padding = 3;private int color_01;private int color_02;private int backColor = Color.WHITE;private int lineColor = Color.GRAY;//描边颜色private int toogleColor = Color.GREEN;//选中颜色private int lineWidth =3;public int getToogleColor() {return toogleColor;}public void setToogleColor(int toogleColor) {this.toogleColor = toogleColor;postInvalidate();}public void setBackColor(int backColor) {this.backColor = backColor;postInvalidate();}public void setLineColor(int lineColor) {this.lineColor = lineColor;postInvalidate();}private void drawView(Canvas canvas) {if (checked) {color_01 = toogleColor;color_02 = backColor;} else {color_01 = backColor;color_02 = toogleColor;}Paint mPaint = new Paint();mPaint.setAntiAlias(true);mPaint.setColor(color_01);int r = Math.min(width / 2, height)-lineWidth;//绘制底色circle_padding = r / 20;RectF mRecF = new RectF((width / 2 - r), height / 2 - r / 2, (width / 2 - r) + 2 * r, height / 2 + r / 2);mPaint.setColor(color_01);canvas.drawRoundRect(mRecF, r / 2, r / 2, mPaint);float p = Math.min(3 / 2 * progress, 1);RectF mRecF2;if (checked) {mRecF2 = new RectF((width / 2 - r) + r * (1 - p), height / 2 - r / 2 * (p), (width / 2 - r) + 2 * r - r * (1 - p), height / 2 + r / 2 * (p));} else {mRecF2 = new RectF((width / 2 - r) + r * p, height / 2 - r / 2 * (1 - p), (width / 2 - r) + 2 * r - r * p, height / 2 + r / 2 * (1 - p));}//绘制动态区域mPaint.setColor(color_02);mPaint.setAlpha((int) ((0.3f + (progress * 0.7)) * 255));canvas.drawRoundRect(mRecF2, r / 2, r / 2, mPaint);//画圆mPaint.setColor(backColor);canvas.drawCircle((width / 2 - r) + 2 * r - r / 2 - (progress) * r, height / 2, r / 2 - circle_padding, mPaint);mPaint.setColor(lineColor);mPaint.setStrokeWidth(lineWidth);mPaint.setStyle(Paint.Style.STROKE);canvas.save();mPaint.setAlpha((int) (progress * 255 * 0.6));canvas.drawRoundRect(mRecF, r / 2, r / 2, mPaint);//描边canvas.drawCircle((width / 2 - r) + 2 * r - r / 2 - (progress) * r, height / 2, r / 2, mPaint);}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);drawView(canvas);}private float progress;public void startAnimation(boolean checked) {int start = 0;int end = 1;if (checked) {start = 1;end = 0;}ValueAnimator animator = ValueAnimator.ofFloat(start, end);animator.setDuration(200);animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {float value = (float) animation.getAnimatedValue();progress = value;postInvalidate();}});//animator.setRepeatMode(ValueAnimator.RESTART);//animator.setRepeatCount(ValueAnimator.INFINITE);//animator.setInterpolator(new AccelerateInterpolator());animator.start();}/*** @author ThinkPad*/public interface OnToggleChangeListener {/*** @param on = =*/public void onToggle(boolean on);}private OnToggleChangeListener onToggleChangeListener;public void setOnToggleChanged(OnToggleChangeListener onToggleChanged) {onToggleChangeListener = onToggleChanged;}}
一个类哪里用拷贝就ok了。或者添加下我的依赖项目
allprojects {repositories {...maven { url 'https://jitpack.io' }}}
dependencies {implementation 'com.github.squirrelhuan:QuickDevelop:1.0.99'}
项目地址：https://github.com/squirrelhuan/QuickDevelop
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