Android 自定义View实现动态炫酷按钮
普通按钮也就那么几种样式，看着都审美疲劳，先放效果图，演示Demo+源码在最后面
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();
}
});
}
}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);
}
}/**
* 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();
}
});
}
}下面给出Demo，源码在Demo里的一个package里面。求人气啊，每次人气都那么低
点我去下载Demo