package com.example.myreveallayout;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
/**
* Android 5.0按钮点击效果
* 说明:可以将View替换成Button、ImageButton等组件。
* @author 阳光小强 http://blog.csdn.net/dawanganban
*
*/
public class MyButton extends View{
private static final int INVALIDATE_DURATION = 20; //每次刷新的时间间隔
private static int DIFFUSE_GAP = 10; //扩散半径增量
private static int TAP_TIMEOUT; //判断点击和长按的时间
private int viewWidth; //控件宽度和高度
private int viewHeight;
private int pointX; //控件原点坐标(左上角)
private int pointY;
private int maxRadio; //扩散的最大半径
private int shaderRadio;
private Paint bottomPaint; //画笔
private Paint colorPaint;
private boolean isPushButton; //记录是否按钮被按下
public MyButton(Context context, AttributeSet attrs) {
super(context, attrs);
initPaint();
TAP_TIMEOUT = ViewConfiguration.getLongPressTimeout();
}
/**
* 初始化画笔资源
*/
private void initPaint() {
colorPaint = new Paint();
bottomPaint = new Paint();
colorPaint.setColor(getResources().getColor(R.color.reveal_color));
bottomPaint.setColor(getResources().getColor(R.color.bottom_color));
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
this.viewWidth = w;
this.viewHeight = h;
}
private int eventX;
private int eventY;
private long downTime = 0;
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//只需要取一次时间
if(downTime == 0){
downTime = SystemClock.elapsedRealtime();
}
eventX = (int)event.getX();
eventY = (int)event.getY();
//计算最大半径
countMaxRadio();
isPushButton = true;
postInvalidateDelayed(INVALIDATE_DURATION);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
if(SystemClock.elapsedRealtime() - downTime < TAP_TIMEOUT){
DIFFUSE_GAP = 30;
postInvalidate();
}else{
clearData();
}
break;
}
return true;
}
/**
* 计算此时的最大半径
*/
private void countMaxRadio() {
if(viewWidth > viewHeight){
if(eventX < viewWidth / 2){
maxRadio = viewWidth - eventX;
}else{
maxRadio = viewWidth / 2 + eventX;
}
}else{
if(eventY < viewHeight / 2){
maxRadio = viewHeight - eventY;
}else{
maxRadio = viewHeight / 2 + eventY;
}
}
}
/**
* 清理改变的数据(初始化数据)
*/
private void clearData(){
downTime = 0;
DIFFUSE_GAP = 10;
isPushButton = false;
shaderRadio = 0;
postInvalidate();
}
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
if(!isPushButton) return; //如果按钮没有被按下则返回
//绘制按下后的整个背景
canvas.drawRect(pointX, pointY, pointX + viewWidth, pointY + viewHeight, bottomPaint);
canvas.save();
//绘制扩散圆形背景
canvas.clipRect(pointX, pointY, pointX + viewWidth, pointY + viewHeight);
canvas.drawCircle(eventX, eventY, shaderRadio, colorPaint);
canvas.restore();
//直到半径等于最大半径
if(shaderRadio < maxRadio){
postInvalidateDelayed(INVALIDATE_DURATION,
pointX, pointY, pointX + viewWidth, pointY + viewHeight);
shaderRadio += DIFFUSE_GAP;
}else{
clearData();
}
}
}
Android5.0按钮波纹效果实现
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转载自blog.csdn.net/suyimin2010/article/details/84501904
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