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);    }    @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);    }}

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 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SoundPool    private SoundPool sp;    // 定义一个整型用load（）；来设置suondIDf    private 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);            }        }    };    @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

    @Override    protected void onDestroy() {        // TODO Auto-generated method stub        super.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