Android特效專輯（十二）——仿支付寶咻一咻功能實現波紋擴散特效，精細小巧的View

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先來看看這個效果

這是我的在Only上添加的效果，說實話，Only現在都還只是半成品，臺面都上不了，怪自己技術不行，也太懶了
PS：這個view也是我模仿了人家的效果，參考了人家的思路寫的，不是純手擼，罪過罪過，網上應該也能找到很多這樣的效果，我只是加入了一些自己的需求在里面

我么新建一個工程——Whew

RoundImageView

這個之前講過，網上 的粒子，把頭像變成圓形的，這里就不多說了，直接擼代碼吧！

package com.lgl.whew;/*** 圓形頭像* 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;/*** 圓形ImageView，可設置最多兩個寬度不同且顏色不同的圓形邊框。** 設置顏色在xml布局文件中由自定義屬性配置參數指定*/public class RoundImageView extends ImageView {private int mBorderThickness = 0;private Context mContext;private int defaultColor = 0xFFFFFFFF;// 如果只有其中一個有值，則只畫一個圓形邊框private int mBorderOutsideColor = 0;private int mBorderInsideColor = 0;// 控件默認長、寬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) {// 定義畫兩個邊框，分別為外圓邊框和內圓邊框radius = (defaultWidth < defaultHeight ? defaultWidth: defaultHeight) / 2 - 2 * mBorderThickness;// 畫內圓drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderInsideColor);// 畫外圓drawCircleBorder(canvas, radius + mBorderThickness+ mBorderThickness / 2, mBorderOutsideColor);} else if (mBorderInsideColor != defaultColor&& mBorderOutsideColor == defaultColor) {// 定義畫一個邊框radius = (defaultWidth < defaultHeight ? defaultWidth: defaultHeight) / 2 - mBorderThickness;drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderInsideColor);} else if (mBorderInsideColor == defaultColor&& mBorderOutsideColor != defaultColor) {// 定義畫一個邊框radius = (defaultWidth < defaultHeight ? defaultWidth: defaultHeight) / 2 - mBorderThickness;drawCircleBorder(canvas, radius + mBorderThickness / 2,mBorderOutsideColor);} else {// 沒有邊框radius = (defaultWidth < defaultHeight ? defaultWidth: defaultHeight) / 2;}Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight/ 2 - radius, null);}/*** 獲取裁剪后的圓形圖片*/public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {Bitmap scaledSrcBmp;int diameter = radius * 2;// 為了防止寬高不相等，造成圓形圖片變形，因此截取長方形中處于中間位置最大的正方形圖片int bmpWidth = bmp.getWidth();int bmpHeight = bmp.getHeight();int squareWidth = 0, squareHeight = 0;int x = 0, y = 0;Bitmap squareBitmap;if (bmpHeight > bmpWidth) {// 高大于寬squareWidth = squareHeight = bmpWidth;x = 0;y = (bmpHeight - bmpWidth) / 2;// 截取正方形圖片squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,squareHeight);} else if (bmpHeight < bmpWidth) {// 寬大于高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;}/*** 邊緣畫圓*/private void drawCircleBorder(Canvas canvas, int radius, int color) {Paint paint = new Paint();/* 去鋸齒 */paint.setAntiAlias(true);paint.setFilterBitmap(true);paint.setDither(true);paint.setColor(color);/* 設置paint的　style　為STROKE：空心 */paint.setStyle(Paint.Style.STROKE);/* 設置paint的外框寬度 */paint.setStrokeWidth(mBorderThickness);canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);}}

這里值得注意的是，要使用這個必須自定義一些屬性，我們在values下新建一個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文件中引入命名空間

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

我們直接看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>

這樣你就可以使用圓形圖片了，我們接下來看波紋的繪制

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;// 是否運行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();// 設置博文的顏色paint.setColor(0x0059ccf5);alphaList.add("255");// 圓心的不透明度startWidthList.add("0");}@Overridepublic void onDraw(Canvas canvas) {super.onDraw(canvas);setBackgroundColor(Color.TRANSPARENT);// 顏色：完全透明// 依次繪制 同心圓for (int i = 0; i < alphaList.size(); i++) {int alpha = Integer.parseInt(alphaList.get(i));// 圓半徑int startWidth = Integer.parseInt(startWidthList.get(i));paint.setAlpha(alpha);// 這個半徑決定你想要多大的擴散面積canvas.drawCircle(getWidth() / 2, getHeight() / 2, startWidth + 50,paint);// 同心圓擴散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");}// 同心圓數量達到10個，刪除最外層圓if (isStarting && startWidthList.size() == 10) {startWidthList.remove(0);alphaList.remove(0);}// 刷新界面invalidate();}// 執行動畫public void start() {isStarting = true;}// 停止動畫public void stop() {isStarting = false;}// 判斷是都在不在執行public boolean isStarting() {return isStarting;}}

這里我們看到，對外有幾個方法，一個開始動畫，一個停止動畫，一個檢測是否正在運行

MainActivity

這里就是我們的需求了，我反編譯了一下支付寶的APK，并沒有找到他的咻一咻的音效，就在他的raw目錄下隨便找了一個，我們現在是需要這樣一個需求

• 點擊圖片執行動畫，并且每隔五分鐘響一次
• 再次點擊圖片，停止動畫，停止音效

我們先新建一個raw文件夾把音效拷貝進去吧

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;// 聲明一個SoundPoolprivate SoundPool sp;// 定義一個整型用load（）；來設置suondIDfprivate int music;private Handler handler = new Handler() {public void handleMessage(android.os.Message msg) {if (msg.what == Nou) {// 每隔10s響一次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() {// 第一個參數為同時播放數據流的最大個數，第二數據流類型，第三為聲音質量sp = new SoundPool(10, AudioManager.STREAM_SYSTEM, 5);// 把你的聲音素材放到res/raw里，第2個參數即為資源文件，第3個為音樂的優先級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()){//如果動畫正在運行就停止，否則就繼續執行wv.stop();//結束進程handler.removeMessages(Nou);}else{// 執行動畫wv.start();handler.sendEmptyMessage(Nou);}}});} }

相信這里的邏輯不是很難吧，對了，我們在結束activity的時候也是要銷毀這個進程的，不然…你懂的

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

我們運行一下，想聽效果的可以下載Demo運行一下，我們這里做一個簡單的演示

Demo下載地址：http://download.csdn.net/detail/qq_26787115/9437957

總結

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