雷达效果，

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Android仿新浪微博雷达扫描效果

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MR.甲

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电梯直达

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发表于 2015-8-31 15:18:14 | 只看该作者回帖奖励

之前在新浪微博看到一个雷达效果，可以查看图

先说说这个效果

1.程序默认提示点击雷达，开始探索

2.当点击雷达，提示正在探索周边的人，同时展示雷达扫描效果，即雷达按钮绕中心旋转，展现波纹达到扫描效果，

3.当触摸雷达时，雷达按钮会缩小，然后手指离开时，雷达按钮会缩回原位

4.最后如果扫描到周边的人，卡片显示周边人的信息，如果没有扫描到，则提示未能探索到周边的人，请稍后再试，同时关闭扫描效果

这里就不卡片展示周边人这个效果，毕竟是仿制，我们只需要关注动画效果，所以做个每两秒执行扫描效果一周，执行3遍显示为没有搜索到周边的人就行了

说说当中的技术点

1.首先是要熟悉canvas，paint,，其中canvas的画圆，画图片（之所以要熟悉画图片，是因为我们有四张图来显示成按钮，这四张图从新浪微博的app里获取，估计它也是这么干的），画文字等要熟悉。

2.雷达按钮绕中心旋转，这就要涉及到矩阵了，因为雷达按钮绕中心旋转，实际上也是对图片进行旋转操作，这样的话Matrix就比较合适了，至于旋转的角度怎么得到，用ValueAnimator比较合适，它可以在你设定的时间内，获取到你设定的两个值（这里指旋转角度，0,到360）之间的速率的变化值，然后刷新View的旋转角度就可以达到旋转的效果了

3.雷达按钮的缩放，原理同旋转，只不过我们关注的是缩放的比率而已

4.雷达的扫描效果，这个可以具体看看微博的效果，它是首先启动灰色波纹效果，没多久白色波纹效果与灰色效果同时抵达，就像波浪，后边的波浪把前一次波浪冲抵，当到达一定程度的时候显示灰色线波纹，达到波浪消失的效果，这里灰色波浪与白色波浪的冲抵效果，我用到了ValueAnimator里的Interpolator，其中分别为灰色波纹为减速DecelerateInterpolator,白色为AccelerateInterpolator,灰色线波纹为LinearInterpolator,一个减速，一个加速，达到追击的效果，一个线性，达到逐渐消失的效果

来看看我们的效果图，请查看附件：

gif录制效果不是很好，大家会给大家提供链接，自行下载查看效果

现在上自定义源码：

package com.RadarScanView.app;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Looper;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.LinearInterpolator;
/**
* Created by Administrator on 2015/8/31.
*/
public class RadarScanView extends View {
//默认扫描图标
private Bitmap mIconScanBitmap;
//扫描时图标
private Bitmap mIconScaningBitmap;
//白色扫描图
private Bitmap mScanBitmap;
//黑色扫描背景
private Bitmap mScanBackgroundBitmap;
//扫描按钮区域
private Rect mButtonArea = new Rect();
//缩放矩阵
private Matrix mScaleMatrix = new Matrix();
//旋转矩阵
private Matrix mRotateMatrix = new Matrix();
//扫描图标旋转动画
private ValueAnimator mRotateAnimator = new ValueAnimator();
//手指点击时白色扫描图片缩小动画
private ValueAnimator mScaleMinAnimator = new ValueAnimator();
//手指放开时白色扫描图片放大动画
private ValueAnimator mScaleMaxAnimator = new ValueAnimator();
//扫描波纹灰色线动画
private ValueAnimator mOutGrayAnimator = new ValueAnimator();
//扫描波纹白色动画
private ValueAnimator mInnerWhiteAnimator = new ValueAnimator();
//扫描波纹灰色动画
private ValueAnimator mBlackAnimator = new ValueAnimator();
//画笔
private Paint mOutGrayPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint mInnerWhitePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint mBlackPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
//扫描图标旋转角度
private float mRotateDegree;
//缩放比例，默认1:1
private float mScaleRatio = 1;
//设定自定义View半径
private int mRadius;
//扫描波纹灰色线半径
private float mOutGrayRadius = 0;
//扫描波纹白色部分半径
private float mInnerWhiteRadius = 0;
//扫描波纹灰色部分半径
private float mBlackRadius = 0;
//默认扫描文字提示
private String mTipText = "点击雷达，开始探索";
//测量扫描文字提示边界
private Rect mTextBound = new Rect();
//是否点击按钮，默认没有点击
private boolean isButtonClick = false;
public RadarScanView(Context context) {
this(context, null);
}
public RadarScanView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RadarScanView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
//加载图片
mIconScanBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.radar_button_icon_scan);
mIconScaningBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.radar_button_icon_scaning);
mScanBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.radar_button_scan);
mScanBackgroundBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.radar_button_scan_background);
//初始化画笔
initViewPaint();
}
private void initViewPaint() {
mOutGrayPaint.setStrokeWidth(4f);
mOutGrayPaint.setColor(Color.rgb(228, 228, 228));
mOutGrayPaint.setDither(true);
mOutGrayPaint.setStyle(Paint.Style.STROKE);
mInnerWhitePaint.setStrokeWidth(1f);
mInnerWhitePaint.setColor(Color.rgb(241, 241, 241));
mInnerWhitePaint.setDither(true);
mInnerWhitePaint.setStyle(Paint.Style.FILL);
mBlackPaint.setStrokeWidth(1f);
mBlackPaint.setColor(Color.rgb(228, 228, 228));
mBlackPaint.setDither(true);
mBlackPaint.setStyle(Paint.Style.FILL);
mTextPaint.setTextSize(37f);
mTextPaint.setColor(Color.rgb(185, 185, 185));
mTextPaint.setDither(true);
mTextPaint.setStyle(Paint.Style.FILL);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
//当按钮只有在图片即按钮区域内则认定为点击，不作点击
isButtonClick = false;
if (mButtonArea.contains((int) event.getX(), (int) event.getY())) {//手指按下，执行缩小动画
if (!mScaleMinAnimator.isRunning() && !mScaleMaxAnimator.isRunning() && !mRotateAnimator.isRunning()) {//如果动画正在执行则不执行动画
isButtonClick = true;
//点击了按钮，启动白色图片缩小动画
mScaleMinAnimator.start();
}
}
break;
case MotionEvent.ACTION_CANCEL:
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
if (isButtonClick) {
//当点击了按钮，启动白色图片放大动画与扫描图片旋转动画
if (!mScaleMaxAnimator.isRunning()) {//如果动画正在执行则不执行动画
mScaleMaxAnimator.start();
}
if (!mRotateAnimator.isRunning()) {//如果动画正在执行则不执行动画
mRotateAnimator.start();
}
}
break;
}
return true;
}
private void initScaleMinAnimator() {
mScaleMinAnimator.setFloatValues(mRadius, mRadius * 0.87f);
mScaleMinAnimator.setDuration(500);
mScaleMinAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mScaleRatio = ((Float) animation.getAnimatedValue()) / mRadius;
invalidateView();
}
});
}
private void initScaleMaxAnimator() {
mScaleMaxAnimator.setFloatValues(mRadius * 0.87f, mRadius);
mScaleMaxAnimator.setDuration(500);
mScaleMaxAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mScaleRatio = ((Float) animation.getAnimatedValue()) / mRadius;
invalidateView();
}
});
}
private void initRoateAnimator() {
mRotateAnimator.setFloatValues(0, 360);
mRotateAnimator.setDuration(2000);
//重复三次，模仿正在扫描
mRotateAnimator.setRepeatCount(3);
mRotateAnimator.setInterpolator(new LinearInterpolator());
mRotateAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mRotateDegree = (Float) animation.getAnimatedValue();
invalidateView();
}
});
mRotateAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
mTipText = "正在探索周边的人...";
//旋转动画启动后启动扫描波纹动画
mOutGrayAnimator.start();
mInnerWhiteAnimator.start();
mBlackAnimator.start();
}
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
//取消扫描波纹动画
mOutGrayAnimator.cancel();
mInnerWhiteAnimator.cancel();
mBlackAnimator.cancel();
//重置界面要素
mOutGrayRadius = 0;
mInnerWhiteRadius = 0;
mBlackRadius = 0;
mTipText = "未能探索到周边的人，请稍后再试";
invalidateView();
}
});
}
private void initOutGrayAnimator() {
mOutGrayAnimator.setFloatValues(mBlackRadius, getMeasuredWidth() / 2);
mOutGrayAnimator.setDuration(1000);
mOutGrayAnimator.setRepeatCount(-1);
mOutGrayAnimator.setInterpolator(new LinearInterpolator());
mOutGrayAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mOutGrayRadius = (Float) animation.getAnimatedValue();
}
});
}
private void initInnerWhiteAnimator() {
mInnerWhiteAnimator.setFloatValues(0, getMeasuredWidth() / 3);
mInnerWhiteAnimator.setDuration(1000);
mInnerWhiteAnimator.setRepeatCount(-1);
mInnerWhiteAnimator.setInterpolator(new AccelerateInterpolator());
mInnerWhiteAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mInnerWhiteRadius = (Float) animation.getAnimatedValue();
}
});
}
private void initBlackAnimator() {
mBlackAnimator.setFloatValues(0, getMeasuredWidth() / 3);
mBlackAnimator.setDuration(1000);
mBlackAnimator.setRepeatCount(-1);
mBlackAnimator.setInterpolator(new DecelerateInterpolator());
mBlackAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
mBlackRadius = (Float) animation.getAnimatedValue();
}
});
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//扫描按钮区域，取自扫描灰色背景图片区域即可
mButtonArea.set(getMeasuredWidth() / 2 - mScanBackgroundBitmap.getWidth() / 2, getMeasuredHeight() / 2 - mScanBackgroundBitmap.getHeight() / 2, getMeasuredWidth() / 2 +
mScanBackgroundBitmap
.getWidth() / 2, getMeasuredHeight() / 2 + mScanBackgroundBitmap.getHeight() / 2);
//View半径,取自View宽高最小者
mRadius = mScanBitmap.getWidth() / 2 > mScanBitmap.getHeight() / 2 ? mScanBitmap.getHeight() / 2 : mScanBitmap.getWidth() / 2;
//初始化动画
initScaleMinAnimator();
initScaleMaxAnimator();
initRoateAnimator();
initBlackAnimator();
initInnerWhiteAnimator();
initOutGrayAnimator();
}
@Override
protected void onDraw(Canvas canvas) {
//绘制波纹
canvas.drawCircle(getMeasuredWidth() / 2, getMeasuredHeight() / 2, mBlackRadius, mBlackPaint);
canvas.drawCircle(getMeasuredWidth() / 2, getMeasuredHeight() / 2, mInnerWhiteRadius, mInnerWhitePaint);
canvas.drawCircle(getMeasuredWidth() / 2, getMeasuredHeight() / 2, mOutGrayRadius, mOutGrayPaint);
//绘制背景
Bitmap mScanBgBitmap = getScanBackgroundBitmap();
if (mScanBgBitmap != null) {
canvas.drawBitmap(mScanBgBitmap, getMeasuredWidth() / 2 - mScanBgBitmap.getWidth() / 2, getMeasuredHeight() / 2 - mScanBgBitmap.getHeight() / 2, new Paint(Paint
.ANTI_ALIAS_FLAG));
}
//绘制按钮背景
Bitmap mButtonBgBitmap = getButtonBackgroundBitmap();
canvas.drawBitmap(mButtonBgBitmap, getMeasuredWidth() / 2 - mButtonBgBitmap.getWidth() / 2, getMeasuredHeight() / 2 - mButtonBgBitmap.getHeight() / 2, new Paint(Paint.ANTI_ALIAS_FLAG));
//绘制扫描图片
Bitmap mScanBitmap = getScanBitmap();
canvas.drawBitmap(mScanBitmap, getMeasuredWidth() / 2 - mScanBitmap.getWidth() / 2, getMeasuredHeight() / 2 - mScanBitmap.getHeight() / 2, new Paint(Paint.ANTI_ALIAS_FLAG));
//绘制文本提示
mTextPaint.getTextBounds(mTipText, 0, mTipText.length(), mTextBound);
//此处50为文本与按钮之间间隔，可以自己设定
canvas.drawText(mTipText, getMeasuredWidth() / 2 - mTextBound.width() / 2, getMeasuredHeight() / 2 + mScanBackgroundBitmap.getHeight() / 2 + mTextBound.height() + 50, mTextPaint);
}
//绘制白色按钮背景，根据缩放矩阵与缩放比例，复制图片达到手指点击与手指放开时按钮的缩小与放大效果
private Bitmap getButtonBackgroundBitmap() {
mScaleMatrix.reset();
mScaleMatrix.postScale(mScaleRatio, mScaleRatio);
return Bitmap.createBitmap(mScanBitmap, 0, 0, mScanBitmap.getWidth(), mScanBitmap.getHeight(), mScaleMatrix, true);
}
//判断是否正在执行旋转动画，如果正在执行动画，则取消灰色白净
private Bitmap getScanBackgroundBitmap() {
if (mRotateAnimator.isRunning()) {
return null;
}
return mScanBackgroundBitmap;
}
//判断是否正在执行动画，如果正在执行，根据旋转矩阵，与旋转的角度复制扫描图标，则实现图标不断旋转，如果未执行，则返回未扫描图片
private Bitmap getScanBitmap() {
if (mRotateAnimator.isRunning()) {
mRotateMatrix.reset();
mRotateMatrix.postRotate(mRotateDegree, mIconScaningBitmap.getWidth() / 2, mIconScaningBitmap.getHeight() / 2);
return Bitmap.createBitmap(mIconScaningBitmap, 0, 0, mIconScaningBitmap.getWidth(), mIconScaningBitmap.getHeight(), mRotateMatrix, true);
}
return mIconScanBitmap;
}
//刷新View
public void invalidateView() {
if (Looper.getMainLooper() == Looper.myLooper()) {
invalidate();
} else {
postInvalidate();
}
}
}

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就整体感觉而言，个人感觉不是很好，不断刷新View对内存，CPU的性能有很高的要求，如果大家有好的思路，请大家共享一下，一起学习吧

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