android自訂群組件（手機加速球+水面波動效果）

android自訂群組件（手機加速球+水面波動效果）

先看效果

本項目實現起來大體上我們分三步講解

【1】水面波動效果

實現代碼

首先畫出波浪線，通過通過貝茲路徑

 for (int i = 0; i < 20; i++) {            path.rQuadTo(20, size, 40, 0);            path.rQuadTo(20, -size, 40, 0);        }

然後讓曲線動起來

private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case 0x23:                    count += 5;                    if (count >= 80) {                        count = 0;                    }                    if (isAdd) {                        size++;                        if (size > 10) {                            isAdd = false;                        }                    } else {                        size--;                        if (size <= -10) {                            isAdd = true;                        }                    }                    invalidate();                    sendEmptyMessageDelayed(0x23, 100);                    break;

【2】顯示加速球圓形

這一步需要用到的知識比較多

1我來給講解一下，畫布的問題；首先onDraw（）提供一個預設的canvas；我們可以想象一下，這塊畫布就是手機螢幕，我們可以使用這塊畫布畫背景色；
2我們的球形加速球，是通過兩層圖重疊取得重疊的部分
如下

我們先畫出了矩形，代碼如下

  path.reset();        path.moveTo(600, courentProgress);        path.lineTo(600, 600);        path.lineTo(count, 600);        path.lineTo(count, courentProgress);

然後畫出了圓形，設定畫筆，使得只顯示兩部分重疊的部分：
此處可參考上一篇：http://blog.csdn.net/taoolee/article/details/48527917

  PorterDuffXfermode mode = new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP);        paintRect.setXfermode(mode);

這樣顯示的效果就是

【3】實現點擊加速球，加速效果
先要添加點擊事件<喎?http://www.bkjia.com/kf/ware/vc/" target="_blank" class="keylink">vcD4NCjxwcmUgY2xhc3M9"brush:java;"> private float x; private float y; @Override public boolean onTouchEvent(MotionEvent event) { x = event.getX(); y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (x>250&&x<550&&y>250&&y<550) { handler.sendEmptyMessage(0x11); return true; } } return super.onTouchEvent(event); }

然後使用handler處理改變當前水面高度，
我們先預設初始高度75%

    private int courentProgress=325;    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case 0x11:                    if(courentProgress<550){                        courentProgress+=5;                        sendEmptyMessageDelayed(0x11,50);                        invalidate();                    }                    break;            }        }    };

最後附上原始碼

/** * Created by Administrator on 2015/9/17. */public class MyPathView extends View {    private Path path;    private Paint paintRect;    private Paint paintBubble;    private Paint paintWave;    private int width;    private int height;    private int count = 0;    private int size = 0;    private int courentProgress=325;    private boolean isAdd = true;    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case 0x23:                    count += 5;                    if (count >= 80) {                        count = 0;                    }                    if (isAdd) {                        size++;                        if (size > 10) {                            isAdd = false;                        }                    } else {                        size--;                        if (size <= -10) {                            isAdd = true;                        }                    }                    invalidate();                    sendEmptyMessageDelayed(0x23, 100);                    break;                case 0x11:                    if(courentProgress<550){                        courentProgress+=5;                        sendEmptyMessageDelayed(0x11,50);                        invalidate();                    }                    break;            }        }    };    public MyPathView(Context context, AttributeSet attrs) {        super(context, attrs);        paintWave = new Paint();        paintWave.setStyle(Paint.Style.STROKE);        paintWave.setTextSize(70);        paintRect = new Paint();        paintRect.setStrokeWidth(5);        paintRect.setColor(Color.rgb(251,122,108));        PorterDuffXfermode mode = new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP);        paintRect.setStyle(Paint.Style.FILL);        paintRect.setXfermode(mode);        paintBubble = new Paint();        paintBubble.setStyle(Paint.Style.FILL);        paintBubble.setColor(Color.rgb(86,111,141));        path = new Path();        handler.sendEmptyMessageDelayed(0x23, 1000);    }    private Bitmap bitmapBubble;    private Canvas canvasBubble;    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);        height = getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec);        setMeasuredDimension(width, height);        bitmapBubble = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        canvasBubble = new Canvas(bitmapBubble);    }    private float x;    private float y;    @Override    public boolean onTouchEvent(MotionEvent event) {        x = event.getX();        y = event.getY();        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                if (x>250&&x<550&&y>250&&y<550) {                    handler.sendEmptyMessage(0x11);                    return true;                }        }        return super.onTouchEvent(event);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawColor(Color.rgb( 246, 235, 188));        canvasBubble.drawCircle(400, 400, 150, paintBubble);        path.reset();        path.moveTo(600, courentProgress);        path.lineTo(600, 600);        path.lineTo(count, 600);        path.lineTo(count, courentProgress);        for (int i = 0; i < 20; i++) {            path.rQuadTo(20, size, 40, 0);            path.rQuadTo(20, -size, 40, 0);        }        path.close();        canvasBubble.drawPath(path, paintRect);        canvas.drawBitmap(bitmapBubble, 0, 0, null);        canvas.drawText((550-courentProgress)/3+%,400,400,paintWave);    }}