概述
本文承接Android Path总结
下述小案例仅为Android Path的api的使用
总结,非项目使用demo!!!
先看下效果~
仿QQ消息气泡拖拽效果
本文仅为记录,直接贴代码了....
public class DragBubbleView extends View {
/**
* 气泡默认状态--静止
*/
private final int BUBBLE_STATE_DEFAULT = 0;
/**
* 气泡相连
*/
private final int BUBBLE_STATE_CONNECT = 1;
/**
* 气泡分离
*/
private final int BUBBLE_STATE_APART = 2;
/**
* 气泡消失
*/
private final int BUBBLE_STATE_DISMISS = 3;
/**
* 气泡半径
*/
private float mBubbleRadius;
/**
* 气泡颜色
*/
private int mBubbleColor;
/**
* 气泡消息文字
*/
private String mTextStr;
/**
* 气泡消息文字颜色
*/
private int mTextColor;
/**
* 气泡消息文字大小
*/
private float mTextSize;
/**
* 不动气泡的半径
*/
private float mBubFixedRadius;
/**
* 可动气泡的半径
*/
private float mBubMovableRadius;
/**
* 不动气泡的圆心
*/
private PointF mBubFixedCenter;
/**
* 可动气泡的圆心
*/
private PointF mBubMovableCenter;
/**
* 气泡的画笔
*/
private Paint mBubblePaint;
/**
* 贝塞尔曲线path
*/
private Path mBezierPath;
private Paint mTextPaint;
//文本绘制区域
private Rect mTextRect;
private Paint mBurstPaint;
//爆炸绘制区域
private Rect mBurstRect;
/**
* 气泡状态标志
*/
private int mBubbleState = BUBBLE_STATE_DEFAULT;
/**
* 两气泡圆心距离
*/
private float mDist;
/**
* 气泡相连状态最大圆心距离
*/
private float mMaxDist;
/**
* 手指触摸偏移量
*/
private final float MOVE_OFFSET;
/**
* 气泡爆炸的bitmap数组
*/
private Bitmap[] mBurstBitmapsArray;
/**
* 是否在执行气泡爆炸动画
*/
private boolean mIsBurstAnimStart = false;
/**
* 当前气泡爆炸图片index
*/
private int mCurDrawableIndex;
/**
* 气泡爆炸的图片id数组
*/
private int[] mBurstDrawablesArray = {R.mipmap.burst_1, R.mipmap.burst_2, R.mipmap.burst_3, R.mipmap.burst_4, R.mipmap.burst_5};
public DragBubbleView(Context context) {
this(context, null);
}
public DragBubbleView(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public DragBubbleView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.DragBubbleView, defStyleAttr, 0);
mBubbleRadius = array.getDimension(R.styleable.DragBubbleView_bubble_radius, mBubbleRadius);
mBubbleColor = array.getColor(R.styleable.DragBubbleView_bubble_color, Color.RED);
mTextStr = array.getString(R.styleable.DragBubbleView_bubble_text);
mTextSize = array.getDimension(R.styleable.DragBubbleView_bubble_textSize, mTextSize);
mTextColor = array.getColor(R.styleable.DragBubbleView_bubble_textColor, Color.WHITE);
array.recycle();
//两个圆半径大小一致
mBubFixedRadius = mBubbleRadius;
mBubMovableRadius = mBubFixedRadius;
mMaxDist = 8 * mBubbleRadius;
MOVE_OFFSET = mMaxDist / 4;
//抗锯齿
mBubblePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mBubblePaint.setColor(mBubbleColor);
mBubblePaint.setStyle(Paint.Style.FILL);
mBezierPath = new Path();
//文本画笔
mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mTextPaint.setColor(mTextColor);
mTextPaint.setTextSize(mTextSize);
mTextRect = new Rect();
//爆炸画笔
mBurstPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mBurstPaint.setFilterBitmap(true);
mBurstRect = new Rect();
mBurstBitmapsArray = new Bitmap[mBurstDrawablesArray.length];
for (int i = 0; i < mBurstDrawablesArray.length; i++) {
//将气泡爆炸的drawable转为bitmap
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), mBurstDrawablesArray[i]);
mBurstBitmapsArray[i] = bitmap;
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//不动气泡圆心
if (mBubFixedCenter == null){
mBubFixedCenter = new PointF(w/2,h/2);
}else{
mBubFixedCenter.set(w/2,h/2);
}
//可动气泡圆心
if (mBubMovableCenter == null){
mBubMovableCenter = new PointF(w/2,h/2);
}else{
mBubMovableCenter.set(w/2,h/2);
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mBubbleState == BUBBLE_STATE_CONNECT){
//绘制不动气泡
canvas.drawCircle(mBubFixedCenter.x, mBubFixedCenter.y, mBubFixedRadius, mBubblePaint);
//绘制贝塞尔曲线
//控制点坐标
int iAnchorX = (int) ((mBubFixedCenter.x + mBubMovableCenter.x) / 2);
int iAnchorY = (int) ((mBubFixedCenter.y + mBubMovableCenter.y) / 2);
float sinTheta = (mBubMovableCenter.y - mBubFixedCenter.y) / mDist;
float cosTheta = (mBubMovableCenter.x - mBubFixedCenter.x) / mDist;
//B
float iBubMovableStartX = mBubMovableCenter.x + sinTheta * mBubMovableRadius;
float iBubMovableStartY = mBubMovableCenter.y - cosTheta * mBubMovableRadius;
//A
float iBubFixedEndX = mBubFixedCenter.x + mBubFixedRadius * sinTheta;
float iBubFixedEndY = mBubFixedCenter.y - mBubFixedRadius * cosTheta;
//D
float iBubFixedStartX = mBubFixedCenter.x - mBubFixedRadius * sinTheta;
float iBubFixedStartY = mBubFixedCenter.y + mBubFixedRadius * cosTheta;
//C
float iBubMovableEndX = mBubMovableCenter.x - mBubMovableRadius * sinTheta;
float iBubMovableEndY = mBubMovableCenter.y + mBubMovableRadius * cosTheta;
mBezierPath.reset();
mBezierPath.moveTo(iBubFixedStartX, iBubFixedStartY);
mBezierPath.quadTo(iAnchorX, iAnchorY, iBubMovableEndX, iBubMovableEndY);
//移动到B点
mBezierPath.lineTo(iBubMovableStartX, iBubMovableStartY);
mBezierPath.quadTo(iAnchorX, iAnchorY,iBubFixedEndX,iBubFixedEndY);
mBezierPath.close();
canvas.drawPath(mBezierPath, mBubblePaint);
}
if (mBubbleState != BUBBLE_STATE_DISMISS){
//绘制一个气泡加消息数据
canvas.drawCircle(mBubMovableCenter.x, mBubMovableCenter.y, mBubMovableRadius, mBubblePaint);
mTextPaint.getTextBounds(mTextStr, 0, mTextStr.length(), mTextRect);
canvas.drawText(mTextStr, mBubMovableCenter.x-mTextRect.width() / 2, mBubMovableCenter.y + mTextRect.height()/2, mTextPaint);
}
if (mBubbleState == BUBBLE_STATE_DISMISS &&mCurDrawableIndex < mBurstBitmapsArray.length){
mBurstRect.set(
(int)(mBubMovableCenter.x - mBubMovableRadius),
(int)(mBubMovableCenter.y - mBubMovableRadius),
(int)(mBubMovableCenter.x + mBubMovableRadius),
(int)(mBubMovableCenter.y + mBubMovableRadius)
);
canvas.drawBitmap(mBurstBitmapsArray[mCurDrawableIndex], null, mBurstRect, mBubblePaint);
}
//1，静止状态，一个气泡加消息数据
//2, 连接状态，一个气泡加消息数据，贝塞尔曲线，本身位置上气泡，大小可变化
//3，分离状态，一个气泡加消息数据
//4，消失状态，爆炸效果
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
if (mBubbleState !=BUBBLE_STATE_DISMISS){
mDist = (float) Math.hypot(event.getX() - mBubFixedCenter.x, event.getY()-mBubFixedCenter.y);
if (mDist < mBubbleRadius + MOVE_OFFSET){ //加上MOVE_OFFSET是为了方便拖拽
mBubbleState = BUBBLE_STATE_CONNECT;
}else{
mBubbleState = BUBBLE_STATE_DEFAULT;
}
}
break;
case MotionEvent.ACTION_MOVE:
if (mBubbleState != BUBBLE_STATE_DEFAULT){
mDist = (float) Math.hypot(event.getX() - mBubFixedCenter.x, event.getY()-mBubFixedCenter.y);
mBubMovableCenter.x = event.getX();
mBubMovableCenter.y = event.getY();
if (mBubbleState == BUBBLE_STATE_CONNECT){
if (mDist < mMaxDist - MOVE_OFFSET){//当拖拽的距离在指定范围内，那么调整不动气泡的半径
mBubFixedRadius = mBubbleRadius- mDist / 8;
}else{
mBubbleState = BUBBLE_STATE_APART;//当拖拽的距离超过指定范围，那么改成分离状态
}
}
invalidate();
}
break;
case MotionEvent.ACTION_UP:
if (mBubbleState == BUBBLE_STATE_CONNECT){
//橡皮筋动画效果
startBubbleRestAnim();
}else if (mBubbleState == BUBBLE_STATE_APART){
if (mDist < 2* mBubbleRadius){
startBubbleRestAnim();
}else{
//爆炸效果
startBubbleBurstAnim();
}
}
break;
}
return true;
}
private void startBubbleBurstAnim() {
mBubbleState = BUBBLE_STATE_DISMISS;
ValueAnimator anim = ValueAnimator.ofInt(0,mBurstBitmapsArray.length);
anim.setDuration(500);
anim.setInterpolator(new LinearInterpolator());
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mCurDrawableIndex = (int) animation.getAnimatedValue();
invalidate();
}
});
anim.start();
}
private void startBubbleRestAnim() {
ValueAnimator anim = ValueAnimator.ofObject(new PointFEvaluator(),
new PointF(mBubMovableCenter.x, mBubMovableCenter.y),
new PointF(mBubFixedCenter.x, mBubFixedCenter.y));
anim.setDuration(200);
anim.setInterpolator(new OvershootInterpolator(5f));
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mBubMovableCenter = (PointF) animation.getAnimatedValue();
invalidate();
}
});
anim.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
mBubbleState = BUBBLE_STATE_DEFAULT;
}
});
anim.start();
}
}
附上用到的属性值
<declare-styleable name="DragBubbleView">
<attr name="bubble_radius" format="dimension"/>
<attr name="bubble_color" format="color"/>
<attr name="bubble_text" format="string"/>
<attr name="bubble_textSize" format="dimension"/>
<attr name="bubble_textColor" format="color"/>
</declare-styleable>
附上用到的xml
<com.test.myapplication.path.DragBubbleView
android:id="@+id/bubbleView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:bubble_color="#ff0000"
app:bubble_radius="12dp"
app:bubble_text="12"
app:bubble_textColor="#ffffff"
app:bubble_textSize="12dp"
app:layout_constraintBottom_toTopOf="@id/button"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
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