Android特效專輯（十二）——如何仿支付寶咻一咻功能實現波紋擴散特效

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

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，台面都上不了，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，不是純手撸，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裡面

我麼新建一個工程——Whew

RoundImageView

這個之前講過，網上 的粒子，把頭像變成圓形的，這裡就不多說了，直接撸代碼吧！

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);

    }

    @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);

    }

    /**
     * 獲取裁剪後的圓形圖片
     */

    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於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) {// 高大於寬

            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) {// 寬大於高

            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);

    }

}

這裡值得注意的是，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

然後在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

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 alphaList = new ArrayList();
    private List startWidthList = new ArrayList();

    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();
        // 設置博文的顏色
        paint.setColor(0x0059ccf5);
        alphaList.add("255");// 圓心的不透明度
        startWidthList.add("0");
    }

    @Override
    public 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;
    }

}

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SoundPool
    private SoundPool sp;
    // 定義一個整型用load（）；來設置suondIDf
    private 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);
            }
        }
    };

    @Override
    protected 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裡，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() {

            @Override
            public 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);
                }
            }
        });

    }
}

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        handler.removeMessages(Nou);
    }