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

先来看看这个效果

这是我的在Only上添加的效果，说实话，Only现在都还只是半成品，台面都上不了，怪自己技术不行，也太懒了
PS：这个view也是我模仿了人家的效果，参考了人家的思路写的，不是纯手撸，罪过罪过，网上应该也能找到很多这样的效果，我只是加入了一些自己的需求在里面

我么新建一个工程——Whew

RoundImageView

这个之前讲过，网上 的粒子，把头像变成圆形的，这里就不多说了，直接撸代码吧！

package com.lgl.whew;/*** 圆形头像* Created by LGL on 2016/1/12.*/import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
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);}@Overrideprotected 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);}}

这里值得注意的是，要使用这个必须自定义一些属性，我们在values下新建一个attr.xml

<?xml version="1.0" encoding="utf-8"?>
<resources><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>

然后在xml文件中引入命名空间

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

我们直接看layout_mian.xml吧

layout_mian.xml

就一些布局咯

<?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>

这样你就可以使用圆形图片了，我们接下来看波纹的绘制

WhewView

package com.lgl.whew;import java.util.ArrayList;
import java.util.List;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;/*** 模仿咻一咻* * @author LGL**/
public class WhewView extends View {private Paint paint;private int maxWidth = 255;// 是否运行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 stubinit();}public WhewView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubinit();}public WhewView(Context context) {super(context);// TODO Auto-generated constructor stubinit();}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");}@Overridepublic 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;}}

这里我们看到，对外有几个方法，一个开始动画，一个停止动画，一个检测是否正在运行

MainActivity

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

• 点击图片执行动画，并且每隔五分钟响一次
• 再次点击图片，停止动画，停止音效

我们先新建一个raw文件夹把音效拷贝进去吧

package com.lgl.whew;import android.app.Activity;
import android.media.AudioManager;
import android.media.SoundPool;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;public class MainActivity extends Activity {private WhewView wv;private RoundImageView my_photo;private static final int Nou = 1;// 声明一个SoundPoolprivate SoundPool sp;// 定义一个整型用load（）；来设置suondIDfprivate int music;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);}}};@Overrideprotected 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() {@Overridepublic 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

@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();handler.removeMessages(Nou);}

我们运行一下，想听效果的可以下载Demo运行一下，我们这里做一个简单的演示

Demo下载地址：http://download.csdn.net/detail/qq_26787115/9437957