Android实现水波纹特效_android教程

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Android实现水波纹特效

发布时间：2019-08-08 发布网站：脚本宝典

脚本宝典收集整理的这篇文章主要介绍了Android实现水波纹特效，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。

最近需要做个类似于水波纹动画的效果，思考了一下不需要UI切个动态图，AndROId原生的技术利用动画或者自定义控件都可以实现，下面上个图类似于这样的效果

Android实现水波纹特效

下面请看第一种动画实现，这种方式较为简单些，就是利用3个ImageView不断地做缩放和渐变的动画。

布局文件定义一下

 <RelativeLayout   android:id="@+id/rl"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:gravITy="center"   android:layout_marginBottom="160dp">   <!--中心imageView-->   <ImageView     android:id="@+id/iv_wave"     android:layout_width="150dp"     android:layout_height="150dp"     android:layout_centerHorizontal="true"     android:background="@drawable/Shape_circle" />   <!--中间的imageView-->   <ImageView     android:id="@+id/iv_wave_1"     android:layout_width="150dp"     android:layout_height="150dp"     android:layout_centerHorizontal="true"     android:background="@drawable/shaPE_circle" />   <!--最外层imageView-->   <ImageView     android:id="@+id/iv_wave_2"     android:layout_width="150dp"     android:layout_height="150dp"     android:layout_centerHorizontal="true"     android:background="@drawable/shape_circle" /> </RelativeLayout>

接下来中间的ImageView保持不变，通过操作另外两个ImageView达到效果

 PRivate void setAnim1() {   AnimationSet as = new AnimationSet(true);   //缩放动画，以中心从原始放大到1.4倍   ScaleAnimation scaleAnimation = new ScaleAnimation(1.0f, 1.4f, 1.0f, 1.4f,       ScaleAnimation.RELATIVE_TO_SELF, 0.5f,       ScaleAnimation.RELATIVE_TO_SELF, 0.5f);   //渐变动画   AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.5f);   scaleAnimation.setDuration(800);   scaleAnimation.setRepeatCount(Animation.INFINITE);   alphaAnimation.setRepeatCount(Animation.INFINITE);   as.setDuration(800);   as.addAnimation(scaleAnimation);   as.addAnimation(alphaAnimation);   iv1.startAnimation(as); } private void setAnim2() {   AnimationSet as = new AnimationSet(true);   //缩放动画，以中心从1.4倍放大到1.8倍   ScaleAnimation scaleAnimation = new ScaleAnimation(1.4f, 1.8f, 1.4f, 1.8f,       ScaleAnimation.RELATIVE_TO_SELF, 0.5f,       ScaleAnimation.RELATIVE_TO_SELF, 0.5f);   //渐变动画   AlphaAnimation alphaAnimation = new AlphaAnimation(0.5f, 0.1f);   scaleAnimation.setDuration(800);   scaleAnimation.setRepeatCount(Animation.INFINITE);   alphaAnimation.setRepeatCount(Animation.INFINITE);   as.setDuration(800);   as.addAnimation(scaleAnimation);   as.addAnimation(alphaAnimation);   iv2.startAnimation(as); }

接下来就是第二种自定义动画实现

首先定义style文件自定义属性--在values下创建attrs.XMl文件

 <declare-styleable name="SpreadView">   <!--中心圆颜色-->   <attr name="spread_center_color" format="color" />   <!--中心圆半径-->   <attr name="spread_radius" format="integer" />   <!--扩散圆颜色-->   <attr name="spread_spread_color" format="color" />   <!--扩散间距-->   <attr name="spread_distance" format="integer" />   <!--扩散最大半径-->   <attr name="spread_max_radius" format="integer" />   <!--扩散延迟间隔-->   <attr name="spread_delay_milliseconds" format="integer" /> </declare-styleable>

接下来创建SpreadView继承view,初始化构造方法

 public SpreadView(Context context) {   this(context,null,0); }   public SpreadView(Context context, @Nullable AttributeSet attrs) {   this(context, attrs,0); }   public SpreadView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {   super(context, attrs, defStyleAttr);   TypedArray a = context.oBTainStyledAttributes(attrs, R.styleable.SpreadView, defStyleAttr, 0);   radius = a.getInt(R.styleable.SpreadView_spread_radius, radius);   maxRadius = a.getInt(R.styleable.SpreadView_spread_max_radius, maxRadius);   int centerColor = a.getColor(R.styleable.SpreadView_spread_center_color, ContextCompat.getColor(context, R.color.colorAccent));   int spreadColor = a.getColor(R.styleable.SpreadView_spread_spread_color, ContextCompat.getColor(context, R.color.colorAccent));   distance = a.getInt(R.styleable.SpreadView_spread_distance, distance);   a.recycle();   centerPaint = new Paint();   centerPaint.setColor(centerColor);   centerPaint.setAntiAlias(true);   //最开始不透明且扩散距离为0   alphas.add(255);   spreadRadius.add(0);   spreadPaint = new Paint();   spreadPaint.setAntiAlias(true);   spreadPaint.setAlpha(255);   spreadPaint.setColor(spreadColor); }

自定义View的绘制：

 @override protected void onDraw(Canvas canvas) {   super.onDraw(canvas);   for (int i = 0; i < spreadRadius.size(); i++) {     int alpha = alphas.get(i);     spreadPaint.setAlpha(alpha);     int width = spreadRadius.get(i);     //绘制扩散的圆     canvas.drawCircle(centerX, centerY, radius + width, spreadPaint);     //每次扩散圆半径递增，圆透明度递减     if (alpha > 0 && width < 300) {       alpha = alpha - distance > 0 &#63; alpha - distance : 1;       alphas.set(i, alpha);       spreadRadius.set(i, width + distance);     }   }   //当最外层扩散圆半径达到最大半径时添加新扩散圆   if (spreadRadius.get(spreadRadius.size() - 1) > maxRadius) {     spreadRadius.add(0);     alphas.add(255);   }   //超过8个扩散圆，删除最先绘制的圆，即最外层的圆   if (spreadRadius.size() >= 8) {     alphas.remove(0);     spreadRadius.remove(0);   }   //中间的圆   canvas.drawCircle(centerX, centerY, radius, centerPaint);   //延迟更新，达到扩散视觉差效果   postInvalidateDelayed(delayMilliseconds); }

最后在activity的布局文件中引用自定义属性：

 <com.example.louliang.spread.SpreadView   android:layout_width="match_parent"   android:layout_height="wrap_content"   app:spread_center_color="@color/colorAccent"   app:spread_delay_milliseconds="35"   app:spread_distance="5"   app:spread_max_radius="90"   app:spread_radius="150"   app:spread_spread_color="@color/colorAccent" />

以上两种方法就实现了水波纹的效果，下载完整的demo请点击链接，希望对大家有所帮助。

源码下载：Android实现水波纹特效

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