Android特效专辑（十二）——仿支付宝咻一咻功能实现波纹扩散特效，精细小巧的View

import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.graphics.drawable.NinePatchDrawable; import android.util.AttributeSet; import android.widget.ImageView; * 圆形ImageView，可设置最多两个宽度不同且颜色不同的圆形边框。 * 设置颜色在xml布局文件中由自定义属性配置参数指定 public class RoundImageView extends ImageView { private int mBorderThickness = 0; private Context mContext; private int defaultColor = 0xFFFFFFFF; // 如果只有其中一个有值，则只画一个圆形边框 private int mBorderOutsideColor = 0; private int mBorderInsideColor = 0; // 控件默认长、宽 private int defaultWidth = 0; private int defaultHeight = 0; public RoundImageView(Context context) { super(context); mContext = context; public RoundImageView(Context context, AttributeSet attrs) { super(context, attrs); mContext = context; setCustomAttributes(attrs); public RoundImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mContext = context; setCustomAttributes(attrs); private void setCustomAttributes(AttributeSet attrs) { TypedArray a = mContext.obtainStyledAttributes(attrs, R.styleable.roundedimageview); mBorderThickness = a.getDimensionPixelSize( R.styleable.roundedimageview_border_thickness, 0); mBorderOutsideColor = a .getColor(R.styleable.roundedimageview_border_outside_color, defaultColor); mBorderInsideColor = a.getColor( R.styleable.roundedimageview_border_inside_color, defaultColor); @Override protected void onDraw(Canvas canvas) { Drawable drawable = getDrawable(); if (drawable == null) { return; if (getWidth() == 0 || getHeight() == 0) { return; this.measure(0, 0); if (drawable.getClass() == NinePatchDrawable.class) return; Bitmap b = ((BitmapDrawable) drawable).getBitmap(); Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true); if (defaultWidth == 0) { defaultWidth = getWidth(); if (defaultHeight == 0) { defaultHeight = getHeight(); int radius = 0; if (mBorderInsideColor != defaultColor mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框 radius = (defaultWidth defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness; // 画内圆 drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor); // 画外圆 drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / 2, mBorderOutsideColor); } else if (mBorderInsideColor != defaultColor mBorderOutsideColor == defaultColor) {// 定义画一个边框 radius = (defaultWidth defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness; drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor); } else if (mBorderInsideColor == defaultColor mBorderOutsideColor != defaultColor) {// 定义画一个边框 radius = (defaultWidth defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness; drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderOutsideColor); } else {// 没有边框 radius = (defaultWidth defaultHeight ? defaultWidth : defaultHeight) / 2; Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius); canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null); * 获取裁剪后的圆形图片 public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) { Bitmap scaledSrcBmp; int diameter = radius * 2; // 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片 int bmpWidth = bmp.getWidth(); int bmpHeight = bmp.getHeight(); int squareWidth = 0, squareHeight = 0; int x = 0, y = 0; Bitmap squareBitmap; if (bmpHeight bmpWidth) {// 高大于宽 squareWidth = squareHeight = bmpWidth; x = 0; y = (bmpHeight - bmpWidth) / 2; // 截取正方形图片 squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight); } else if (bmpHeight bmpWidth) {// 宽大于高 squareWidth = squareHeight = bmpHeight; x = (bmpWidth - bmpHeight) / 2; y = 0; squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight); } else { squareBitmap = bmp; if (squareBitmap.getWidth() != diameter || squareBitmap.getHeight() != diameter) { scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter, diameter, true); } else { scaledSrcBmp = squareBitmap; Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(), scaledSrcBmp.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(output); Paint paint = new Paint(); Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(), scaledSrcBmp.getHeight()); paint.setAntiAlias(true); paint.setFilterBitmap(true); paint.setDither(true); canvas.drawARGB(0, 0, 0, 0); canvas.drawCircle(scaledSrcBmp.getWidth() / 2, scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2, paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(scaledSrcBmp, rect, rect, paint); bmp = null; squareBitmap = null; scaledSrcBmp = null; return output; * 边缘画圆 private void drawCircleBorder(Canvas canvas, int radius, int color) { Paint paint = new Paint(); /* 去锯齿 */ paint.setAntiAlias(true); paint.setFilterBitmap(true); paint.setDither(true); paint.setColor(color); /* 设置paint的 style 为STROKE：空心 */ paint.setStyle(Paint.Style.STROKE); /* 设置paint的外框宽度 */ paint.setStrokeWidth(mBorderThickness); canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint); }
declare-styleable name="roundedimageview" attr name="border_thickness" format="dimension" / attr name="border_inside_color" format="color" / attr name="border_outside_color" format="color" /attr /declare-styleable /resources

 ?xml version="1.0" encoding="utf-8"? 

 LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"

 android:layout_width="match_parent"

 android:layout_height="match_parent"

 android:orientation="vertical" 

 RelativeLayout

 android:layout_width="match_parent"

 android:layout_height="wrap_content" 

 com.lgl.whew.WhewView

 android:id="@+id/wv"

 android:layout_width="match_parent"

 android:layout_height="match_parent" / 

 com.lgl.whew.RoundImageView

 android:id="@+id/my_photo"

 android:layout_width="100dp"

 android:layout_height="100dp"

 android:layout_centerInParent="true"

 android:src="@drawable/myphoto"

 imagecontrol:border_inside_color="#bc0978"

 imagecontrol:border_outside_color="#ba3456"

 imagecontrol:border_thickness="1dp" / 

 /RelativeLayout 

 /LinearLayout 

private boolean isStarting = false; private List String alphaList = new ArrayList String private List String startWidthList = new ArrayList String public WhewView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); // TODO Auto-generated constructor stub init(); public WhewView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub init(); public WhewView(Context context) { super(context); // TODO Auto-generated constructor stub init(); private void init() { paint = new Paint(); // 设置博文的颜色 paint.setColor(0x0059ccf5); alphaList.add("255");// 圆心的不透明度 startWidthList.add("0"); @Override public void onDraw(Canvas canvas) { super.onDraw(canvas); setBackgroundColor(Color.TRANSPARENT);// 颜色：完全透明 // 依次绘制 同心圆 for (int i = 0; i alphaList.size(); i++) { int alpha = Integer.parseInt(alphaList.get(i)); // 圆半径 int startWidth = Integer.parseInt(startWidthList.get(i)); paint.setAlpha(alpha); // 这个半径决定你想要多大的扩散面积 canvas.drawCircle(getWidth() / 2, getHeight() / 2, startWidth + 50, paint); // 同心圆扩散 if (isStarting alpha 0 startWidth maxWidth) { alphaList.set(i, (alpha - 1) + ""); startWidthList.set(i, (startWidth + 1) + ""); if (isStarting Integer .parseInt(startWidthList.get(startWidthList.size() - 1)) == maxWidth / 5) { alphaList.add("255"); startWidthList.add("0"); // 同心圆数量达到10个，删除最外层圆 if (isStarting startWidthList.size() == 10) { startWidthList.remove(0); alphaList.remove(0); // 刷新界面 invalidate(); // 执行动画 public void start() { isStarting = true; // 停止动画 public void stop() { isStarting = false; // 判断是都在不在执行 public boolean isStarting() { return isStarting;

这里就是我们的需求了，我反编译了一下支付宝的APK，并没有找到他的咻一咻的音效，就在他的raw目录下随便找了一个，我们现在是需要这样一个需求

private Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { if (msg.what == Nou) { // 每隔10s响一次 handler.sendEmptyMessageDelayed(Nou, 5000); sp.play(music, 1, 1, 0, 0, 1); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); private void initView() { // 第一个参数为同时播放数据流的最大个数，第二数据流类型，第三为声音质量 sp = new SoundPool(10, AudioManager.STREAM_SYSTEM, 5); // 把你的声音素材放到res/raw里，第2个参数即为资源文件，第3个为音乐的优先级 music = sp.load(this, R.raw.hongbao_gq, 1); wv = (WhewView) findViewById(R.id.wv); my_photo = (RoundImageView) findViewById(R.id.my_photo); my_photo.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if(wv.isStarting()){ //如果动画正在运行就停止，否则就继续执行 wv.stop(); //结束进程 handler.removeMessages(Nou); }else{ // 执行动画 wv.start(); handler.sendEmptyMessage(Nou);

相信这里的逻辑不是很难吧，对了，我们在结束activity的时候也是要销毁这个进程的，不然…你懂的

Android View滑动相关的基础知识点 *本文涉及到的知识点：MotionEvent、ViewConfiguration、VelocityTracker 、GestureDetector、scrollTo、scrollBy、Scroller、OverScroller*
Android自定义View工具：Paint&Canvas(一) 本文主要讲的是自定义View时我们经常用到的Canvas和Paint，像平时画画一样，我们需要画布和画笔，而Canvas就是画布，Paint就是画笔