普通按钮也就那么几种样式，看着都审美疲劳，先放效果图：
你会不会以为这个按钮是集结了很多动画的产物，我告诉你，并没有。所有的实现都是基于自定义View，采用最底层的onDraw一点一点的画出来的。没有采用一丁点的动画。虽然演示时间很短，但是要完成这么多变化，还是挺吃力。首先讲解用法：
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final AnimationButton button = (AnimationButton) findViewById(R.id.button);// button.setTextSizeTouch(25); //设置按下时字体的大小，不设置有默认值// button.setStrokeProgress(10); //设置进度条的厚度，不设置有默认值// button.setColorBase(Color.GREEN); //设置整体基色，不设置有默认值// button.setColorBack(Color.GRAY); //设置进度条的背景色，不设置有默认值// button.setStroke(3); //设置边框的厚度，不设置有默认值// button.setStrokeText(0); //设置文本的厚度，不设置有默认值// button.setTextSize(30); //设置文本的字体大小，不设置有默认值// button.setRound(30); //设置圆角，不设置有默认值 button.setText("登录"); //设置文本，不设置有默认值 button.setMode(AnimationButton.Mode.Hand_Finish); //设置进度条模式，不设置有默认值Mode.Auto_Finish button.setOnAnimationButtonClickListener(new AnimationButton.OnAnimationButtonClickListener() { @Override public void onClick() { //stopProgress方法 仅仅在button.setMode(AnimationButton.Mode.Hand_Finish);之后才有效。 button.stopProgress(); } }); }}
其实如果只需要最普通的功能，根本什么都不用做。因为几乎所有的参数都已经设置了固定内设置。在上面注释掉的函数用法也是用户唯一能用的几个函数，其他函数虽然标示为public，但是却是因为组件之内的方法传递，而不是给外界用户调用的。因此大家如果想自定义样式，可以调用注释里的方法。
下面开始源码讲解，首先分解功能，所有的变化可以分为三个状态：1、默认状态，也就是最初的状态。主要完成的事情为：接收用户的点击，改变背景的样式从空心变为实心，动态改变文本的大小，然后就是逐渐得缩小成一个圆。2、进度条状态。主要完成进度条的递进，演示图上只转了一圈。其实可以通过设置一个参数，转动多圈直到用户手动停止，甚至无限转动3、结束状态。主要完成由圆的状态变回圆角矩形的状态，并呈现中间的Logo
既然分割出了状态，那么就采用状态机+代理模式来实现这个功能吧。首先是状态的枚举。
/** * Created by ccwxf on 2016/2/29. * 用于区别状态，有：默认状态、进度条状态、结束状态 */public enum Status { Default, Progress, Finish}
然后是状态机的接口，也就是所有的状态需要完成的共同的事情：
/** * Created by ccwxf on 2016/2/29. */public interface ButtonStatus { /** * @return 对应的Status值 */ Status getStatus(); /** * 这个状态的事件处理代理 * @param mEvent * @return */ boolean onTouchEvent(MotionEvent mEvent); /** * 这个状态的绘制代理 * @param mCanvas * @param mPaint */ void onDraw(Canvas mCanvas, Paint mPaint);}
然后我们实现按钮的代码，也就是自定义View：
/** * Created by ccwxf on 2016/2/29. */public class AnimationButton extends View { private static int Color_Base = Color.rgb(24, 204, 149); private static int Color_Back = Color.rgb(153, 153, 153); private static int Stroke = 3; private static int Stroke_Text = 0; private static int Stroke_Progress = 10; private static int Text_Size = 30; private static int Text_Size_Touch = 25; private static int Round = 30; private static String Text = "提交"; private Mode mode = Mode.Auto_Finish; private int maxWidth; private int maxHeight; private int colorBase = Color_Base; private int colorBack = Color_Back; private int stroke = Stroke; private int strokeText = Stroke_Text; private int strokeProgress = Stroke_Progress; private int textSize = Text_Size; private int textSizeTouch = Text_Size_Touch; private int round = Round; private String text = Text; //是否停止进度条，由外界设置 private boolean isProgressStop = false; private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); private ButtonStatus status; private OnAnimationButtonClickListener listener; public Mode getMode() { return mode; } public void setMode(Mode mode) { this.mode = mode; } public int getMaxWidth() { return maxWidth; } public int getMaxHeight() { return maxHeight; } public int getTextSizeTouch() { return textSizeTouch; } public void setTextSizeTouch(int textSizeTouch) { this.textSizeTouch = textSizeTouch; } public int getStrokeProgress() { return strokeProgress; } public void setStrokeProgress(int strokeProgress) { this.strokeProgress = strokeProgress; } public int getColorBase() { return colorBase; } public void setColorBase(int colorBase) { this.colorBase = colorBase; } public int getColorBack() { return colorBack; } public void setColorBack(int colorBack) { this.colorBack = colorBack; } public int getStroke() { return stroke; } public void setStroke(int stroke) { this.stroke = stroke; } public int getStrokeText() { return strokeText; } public void setStrokeText(int strokeText) { this.strokeText = strokeText; } public int getTextSize() { return textSize; } public void setTextSize(int textSize) { this.textSize = textSize; } public int getRound() { return round; } public void setRound(int round) { this.round = round; } public String getText() { return text; } public void setText(String text) { this.text = text; } public AnimationButton(Context context) { super(context); } public AnimationButton(Context context, AttributeSet attrs) { super(context, attrs); } public AnimationButton(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override public boolean onTouchEvent(MotionEvent event) { if (status != null) { return status.onTouchEvent(event); } return super.onTouchEvent(event); } @Override protected void onDraw(Canvas canvas) { if (status != null) { status.onDraw(canvas, mPaint); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { maxWidth = MeasureSpec.getSize(widthMeasureSpec); maxHeight = MeasureSpec.getSize(heightMeasureSpec); if (maxWidth != 0 && maxHeight != 0) { status = new DefaultStatus(this, maxWidth, maxHeight); } super.onMeasure(widthMeasureSpec, heightMeasureSpec); } /** * 改变整体状态 * * @param s 改变的状态 * @param width 目前的宽度 * @param height 目前的高度 */ public void changeStatus(Status s, int width, int height, int centerX, int centerY) { switch (s) { case Default: break; case Progress: //改变状态，进入进度条状态 status = new ProgressStatus(this, width, height, centerX, centerY); invalidate(); break; case Finish: //进入结束状态 status = new FinishStatus(this, width, height, centerX, centerY); invalidate(); break; } } /** * 外界设置停止进度条 */ public void stopProgress(){ this.isProgressStop = true; } /** * 检查是否进度条结束 * @return */ public boolean isProgressStop(){ return isProgressStop; } public enum Mode{ Auto_Finish, Hand_Finish } public interface OnAnimationButtonClickListener{ void onClick(); } public void setOnAnimationButtonClickListener(OnAnimationButtonClickListener listener){ this.listener = listener; } public OnAnimationButtonClickListener getOnAnimationButtonClickListener(){ return listener; }}
上面实现了一堆的变量参数供用户自定义。然后在onTouchEvent和onDraw方法中，将所有操作都代理出去。然后我们来实现第一个状态，也就是默认状态：
/** * Created by ccwxf on 2016/2/29. */public class DefaultStatus implements ButtonStatus { //分别表示处于默认状态内部的四个子状态 private static final int Status_Default = 0; private static final int Status_Touch = 1; private static final int Status_Up = 2; private static final int Status_Next = 3; //刷新width时的渐变量以及时间间距 private static final int Delay_Next = 500; private static final int Delay_Frush = 10; private static final int Pixel_Frush = 8; //按钮对象 private AnimationButton button; //按钮对象的长宽与中点坐标（长宽为绘制的长宽，而不是控件的长宽） private int width; private int height; private int centerX; private int centerY; //子状态变量 private int status = Status_Default; private Handler handler = new Handler(); public DefaultStatus(AnimationButton button, int width, int height) { this.button = button; this.width = width; this.height = height; this.centerX = width / 2; this.centerY = height / 2; } @Override public Status getStatus() { return Status.Default; } @Override public boolean onTouchEvent(MotionEvent mEvent) { switch (mEvent.getAction()) { case MotionEvent.ACTION_DOWN: //按下时，切换到按下子状态 if(status == Status_Default){ status = Status_Touch; button.invalidate(); } return true; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: //抬起时，或者移除控件时，切换到抬起子状态 if(status == Status_Touch){ status = Status_Up; button.invalidate(); //过500ms延迟后开始进行伸缩变化 handler.postDelayed(new Runnable() { @Override public void run() { //切换到next子状态 if(status == Status_Up){ status = Status_Next; } if(status == Status_Next){ //若长宽不一致，则继续渐变，否则改变状态 if (width >= height) { width -= Pixel_Frush; button.invalidate(); handler.postDelayed(this, Delay_Frush); }else{ button.changeStatus(Status.Progress, width, height, centerX, centerY); } } } }, Delay_Next); //响应监听器 AnimationButton.OnAnimationButtonClickListener listener = button.getOnAnimationButtonClickListener(); if(listener != null){ listener.onClick(); } } break; } return false; } @Override public void onDraw(Canvas mCanvas, Paint mPaint) { switch (status) { case Status_Default: onDrawDefault(mCanvas, mPaint); break; case Status_Touch: onDrawTouch(mCanvas, mPaint); break; case Status_Up: onDrawUp(mCanvas, mPaint); break; case Status_Next: onDrawNext(mCanvas, mPaint); break; } } /** * 绘制边框，分为空心和实心两种 * * @param mCanvas 画布 * @param mPaint 画笔 * @param style 空心或者实心 * @param padding 边框补白 */ private void drawRound(Canvas mCanvas, Paint mPaint, Paint.Style style, int padding) { mPaint.setColor(button.getColorBase()); int stroke = padding; if (style == Paint.Style.STROKE) { mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(button.getStroke()); stroke += button.getStroke() / 2; } else { mPaint.setStyle(Paint.Style.FILL); } //绘制边框 mCanvas.drawRoundRect(new RectF(stroke, stroke, width - stroke, height - stroke), button.getRound(), button.getRound(), mPaint); } /** * 画文字，有字体大小和颜色的区别 * * @param mCanvas 画布 * @param mPaint 画笔 * @param textSize 字体大小 * @param textColor 字体颜色 */ private void drawText(Canvas mCanvas, Paint mPaint, int textSize, int textColor) { mPaint.setColor(textColor); mPaint.setStrokeWidth(button.getStrokeText()); mPaint.setTextSize(textSize); Paint.FontMetrics metrics = mPaint.getFontMetrics(); int textWidth = (int) mPaint.measureText(button.getText()); int baseLine = (int) (height / 2 + (metrics.bottom - metrics.top) / 2 - metrics.bottom); mCanvas.drawText(button.getText(), (width - textWidth) / 2, baseLine, mPaint); } /** * 绘制默认状态的按钮 * * @param mCanvas * @param mPaint */ private void onDrawDefault(Canvas mCanvas, Paint mPaint) { drawRound(mCanvas, mPaint, Paint.Style.STROKE, 0); //绘制居中文字 drawText(mCanvas, mPaint, button.getTextSize(), button.getColorBase()); } /** * 绘制按下状态的按钮 * * @param mCanvas * @param mPaint */ private void onDrawTouch(Canvas mCanvas, Paint mPaint) { drawRound(mCanvas, mPaint, Paint.Style.FILL, button.getStroke()); //绘制文字，字体要变化 drawText(mCanvas, mPaint, button.getTextSizeTouch(), Color.WHITE); } /** * 绘制抬起状态的按钮 * * @param mCanvas * @param mPaint */ private void onDrawUp(Canvas mCanvas, Paint mPaint) { drawRound(mCanvas, mPaint, Paint.Style.FILL, 0); drawText(mCanvas, mPaint, button.getTextSize(), Color.WHITE); } /** * 绘制进入下一状态的按钮 * * @param mCanvas * @param mPaint */ private void onDrawNext(Canvas mCanvas, Paint mPaint) { mPaint.setColor(button.getColorBase()); mPaint.setStyle(Paint.Style.FILL); //绘制边框 if (width >= height) { mCanvas.drawRoundRect(new RectF(centerX - width / 2, centerY - height / 2, centerX + width / 2, centerY + height / 2), button.getRound(), button.getRound(), mPaint); //绘制文字 mPaint.setColor(Color.WHITE); mPaint.setStrokeWidth(button.getStrokeText()); mPaint.setTextSize(button.getTextSize()); Paint.FontMetrics metrics = mPaint.getFontMetrics(); int textWidth = (int) mPaint.measureText(button.getText()); int baseLine = (int) (centerY + (metrics.bottom - metrics.top) / 2 - metrics.bottom); mCanvas.drawText(button.getText(), centerX - textWidth / 2, baseLine, mPaint); } else { mCanvas.drawOval(new RectF(centerX - width / 2, centerY - height / 2, centerX + width / 2, centerY + height / 2), mPaint); } }}
然后是第二个状态，进度条状态：
/** * Created by ccwxf on 2016/2/29. */public class ProgressStatus implements ButtonStatus { //转圈的子状态 private static final int Status_Once = 0; private static final int Status_Twice = 1; //转圈的渐变量 private static final int Delay_Progress = 10; private static final int Angle_Progress = 5; private static final int Angle_Default = -90; private static final int Andle_Full = 270; private AnimationButton button; private int width; private int height; private int centerX; private int centerY; private int radius; private int status = Status_Once; //当前的进度 private float progress = Angle_Default; private Handler handler = new Handler(); public ProgressStatus(AnimationButton button, int width, int height, int centerX, int centerY) { this.button = button; this.width = width; this.height = height; this.centerX = centerX; this.centerY = centerY; //绘制起点是Stroke的中点，若不减去这个值，则onDraw时，会不完整。 this.radius = (width - button.getStrokeProgress()) / 2; startProgress(); } /** * 开始递归转动进度条 */ private void startProgress() { handler.postDelayed(new Runnable() { @Override public void run() { if(progress >= Andle_Full){ //如果是手动结束模式 if(button.getMode() == AnimationButton.Mode.Hand_Finish && button.isProgressStop()){ //改变状态 button.changeStatus(Status.Finish, width, height, centerX, centerY); return; }else{ if(status == Status_Once){ status = Status_Twice; }else if(status == Status_Twice){ //如果是自动结束模式，则在第二次进度结束时改变状态 if(button.getMode() == AnimationButton.Mode.Auto_Finish){ //改变状态 button.changeStatus(Status.Finish, width, height, centerX, centerY); return; }else{ status = Status_Once; } } //重置进度 progress = Angle_Default; } } progress += Angle_Progress; button.invalidate(); handler.postDelayed(this, Delay_Progress); } }, Delay_Progress); } @Override public Status getStatus() { return Status.Progress; } @Override public boolean onTouchEvent(MotionEvent mEvent) { return false; } @Override public void onDraw(Canvas mCanvas, Paint mPaint) { if(status == Status_Once){ //绘制灰色背景 onDrawCircle(mCanvas, mPaint, button.getColorBack()); //绘制绿色进度 onDrawArc(mCanvas, mPaint, button.getColorBase(), Angle_Default, progress); }else if(status == Status_Twice){ //绘制绿色背景 onDrawCircle(mCanvas, mPaint, button.getColorBase()); //绘制灰色进度 onDrawArc(mCanvas, mPaint, button.getColorBack(), Angle_Default, progress); } } /** * 画一整个圆作为背景 * @param mCanvas 画布 * @param mPaint 画笔 * @param color 颜色 */ private void onDrawCircle(Canvas mCanvas, Paint mPaint, int color){ mPaint.setColor(color); mPaint.setStrokeWidth(button.getStrokeProgress()); mPaint.setStyle(Paint.Style.STROKE); mCanvas.drawCircle(centerX, centerY, radius, mPaint); } /** * 画一端圆弧 * @param mCanvas 画布 * @param mPaint 画笔 * @param color 颜色 * @param start 开始角度 * @param stop 结束角度 */ private void onDrawArc(Canvas mCanvas, Paint mPaint, int color, float start, float stop){ mPaint.setColor(color); mPaint.setStrokeWidth(button.getStrokeProgress()); mPaint.setStyle(Paint.Style.STROKE); //第三个参数是扫过的角度，起点0默认为右边 mCanvas.drawArc(new RectF(centerX - radius, centerY - radius, centerX + radius, centerY + radius), start, stop - start, false, mPaint); }}
最后一个状态：
/** * Created by ccwxf on 2016/2/29. */public class FinishStatus implements ButtonStatus { private static final int Status_Stretch = 0; private static final int Status_Finish = 1; private static final int Stroke_Over = 10; private static final String Text_Over = "√"; private static final int Text_Over_Size = 40; private static final int Delay_Stretch = 10; private static final int Pixel_Stretch = 8; private AnimationButton button; private int width; private int height; private int centerX; private int centerY; private int status = Status_Stretch; private Handler handler = new Handler(); public FinishStatus(AnimationButton button, int width, int height, int centerX, int centerY) { this.button = button; this.width = width; this.height = height; this.centerX = centerX; this.centerY = centerY; startStretch(); } /** * 开始伸展背景 */ private void startStretch() { handler.postDelayed(new Runnable() { @Override public void run() { if(width < button.getMaxWidth()){ width += Pixel_Stretch; button.invalidate(); handler.postDelayed(this, Delay_Stretch); }else{ width = button.getMaxWidth(); if(status == Status_Stretch){ status = Status_Finish; } button.invalidate(); } } }, Delay_Stretch); } @Override public Status getStatus() { return Status.Finish; } @Override public boolean onTouchEvent(MotionEvent mEvent) { return false; } @Override public void onDraw(Canvas mCanvas, Paint mPaint) { //绘制背景 mPaint.setColor(button.getColorBase()); mPaint.setStyle(Paint.Style.FILL); mCanvas.drawRoundRect(new RectF(centerX - width / 2, centerY - height / 2, centerX + width / 2, centerY + height / 2 ), button.getRound(), button.getRound(), mPaint); //绘制图片 if(status == Status_Finish){ mPaint.setColor(Color.WHITE); mPaint.setStrokeWidth(Stroke_Over); mPaint.setTextSize(Text_Over_Size); Paint.FontMetrics metrics = mPaint.getFontMetrics(); int textWidth = (int) mPaint.measureText(Text_Over); int baseLine = (int) (height / 2 + (metrics.bottom - metrics.top) / 2 - metrics.bottom); mCanvas.drawText(Text_Over, (width - textWidth) / 2, baseLine, mPaint); } }}
好了上面就是所有的源码了。虽然被我概括成三个大状态，但是如果分细一点的话，大概需要9个状态。在各个大状态代码里面的子状态就是这个了。怎么使用呢，也非常简单，因为大部分的参数都有内设值了。
/** * Created by ccwxf on 2016/2/29. */public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final AnimationButton button = (AnimationButton) findViewById(R.id.button);// button.setTextSizeTouch(25); //设置按下时字体的大小，不设置有默认值// button.setStrokeProgress(10); //设置进度条的厚度，不设置有默认值// button.setColorBase(Color.GREEN); //设置整体基色，不设置有默认值// button.setColorBack(Color.GRAY); //设置进度条的背景色，不设置有默认值// button.setStroke(3); //设置边框的厚度，不设置有默认值// button.setStrokeText(0); //设置文本的厚度，不设置有默认值// button.setTextSize(30); //设置文本的字体大小，不设置有默认值// button.setRound(30); //设置圆角，不设置有默认值 button.setText("登录"); //设置文本，不设置有默认值 button.setMode(AnimationButton.Mode.Hand_Finish); //设置进度条模式，不设置有默认值Mode.Auto_Finish button.setOnAnimationButtonClickListener(new AnimationButton.OnAnimationButtonClickListener() { @Override public void onClick() { //stopProgress方法 仅仅在button.setMode(AnimationButton.Mode.Hand_Finish);之后才有效。 button.stopProgress(); } }); }}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
不会因为忧伤而风情万种。
