Android自定义View制作动态炫酷按钮实例解析

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。 

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：

public interface ButtonStatus {
 
 Status getStatus();
 
 boolean onTouchEvent(MotionEvent mEvent);
 
 void onDraw(Canvas mCanvas, Paint mPaint);
}

 然后我们实现按钮的代码，也就是自定义View： 

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);
 }
 
 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;
 }
 }
 
 public void stopProgress(){
 this.isProgressStop = true;
 }
 
 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： 

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;
 }
 }
 
 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);
 }
 
 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);
 }
 
 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());
 }
 
 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);
 }
 
 private void onDrawUp(Canvas mCanvas, Paint mPaint) {
 drawRound(mCanvas, mPaint, Paint.Style.FILL, 0);
 drawText(mCanvas, mPaint, button.getTextSize(), Color.WHITE);
 }
 
 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： 

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();
 }
 
 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);
 }
 }
 
 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);
 }
 
 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：

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();
 }
 
 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。 

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();
  }
 });
 }
}

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