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android自定义组件(手机加速球+水面波动效果)

2015-09-18 19:28 本站整理 浏览(279)
先看效果

本项目实现起来大体上我们分三步讲解

【1】水面波动效果

实现代码

首先画出波浪线,通过通过贝塞尔曲线

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

        }


然后让曲线动起来
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】显示加速球圆形

这一步需要用到的知识比较多
1我来给讲解一下,画布的问题;首先onDraw()提供一个默认的canvas;我们可以想象一下,这块画布就是手机屏幕,我们可以使用这块画布画背景色;
2我们的球形加速球,是通过两层图重叠取得重叠的部分
示意图如下

我们先画出了矩形,代码如下
path.reset();

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

然后画出了圆形,设置画笔,使得只显示两部分重叠的部分:
此处可参考上一篇:http://www.lai18.com/content/460279.html
PorterDuffXfermode mode = new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP);

        paintRect.setXfermode(mode);

这样显示的效果就是

【3】实现点击加速球,加速效果
先要添加点击事件
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);
    }

然后使用handler处理改变当前水面高度,
我们先默认初始高度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;
            }

        }
    };

最后附上源代码

/**
* 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);
}
}