实现原理
首先就是自定义个WaveView 继承View,然后再WaveView 内部实现代码逻辑：
① 水波就波嘛？ sin函数？ 贝塞尔曲线？ 都行，这里就用二阶贝塞 尔曲线去画吧
② 波要动嘛，怎么动呢？线程？ 好吧 这里用了个Handler。
③绘制波首先要找点，那么在onMeasure()里找出需要的点咯，这里就暂时展示一个波段吧，一个波长移动左边不就没了？OK 那就两个波吧，吼吼，两个波（猥琐男潜质表露无遗啊）。接下来就是Handler 结合 onDraw()绘制。OK，那就先看我Word绘制的粗瘪的波动图，请看VCR，oh，no... gif
意思就是波平移一个波长之后回到初始位置继续平移循环。
好吧，有人说了，这么简单的逻辑你要啰嗦那么多？？？
好吧，我承认，我有唐僧的潜质。。。
闲话就不说了，先上
效果图
示例代码如下
调用的Activity
* Created by LiuDong on 2016/12/22.
* Email:15002102128@126.com
*/
public class WaveActivity extends Activity {
LD_WaveView waveView;//方形
LD_WaveView waveCircleView;//圆形
private int progrees=0;//进度
private Handler mHandler=new Handler(){
@Override
public void handleMessage(Message msg) {
if (progrees==100) progrees=0;
Log.i("progress",progrees+"");
waveView.setmProgress(progrees++);
waveCircleView.setmProgress(progrees++);
mHandler.sendEmptyMessageDelayed(0,100);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wave);
waveView= (LD_WaveView) findViewById(R.id.waveView);
waveCircleView= (LD_WaveView) findViewById(R.id.waveViewCircle);
mHandler.sendEmptyMessageDelayed(0,10);
}
}
xml布局
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="vertical" android:layout_width="match_parent" android:background="@color/ld_White" android:layout_height="match_parent"> <com.dadong.ld_tools.widget.LD_WaveView android:id="@+id/waveViewCircle" android:layout_marginTop="20dp" android:layout_width="100dp" android:layout_centerHorizontal="true" android:layout_height="100dp" app:wave_color="@color/ld_Black" app:wave_circle="true" /> <com.dadong.ld_tools.widget.LD_WaveView android:id="@+id/waveView" android:layout_width="100dp" android:layout_height="100dp" app:wave_color="@color/ld_Black" app:wave_circle="false" android:layout_centerInParent="true" /> </RelativeLayout>
自定义WaveView
/**
* Created by LiuDong on 2016/12/23.
* Email:15002102128@126.com
*/
public class LD_WaveView extends View {
private int mProgress;//进度
private int mTimeStep = 10;//时间间隔
private int mSpeed = 5;//波单次移动的距离
private int mViewHeight;//视图宽高
private int mViewWidth;//视图宽度
private int mLevelLine;// 基准线
private int mWaveLength;//波长 暂定view宽度为一个波长
private int mStrokeWidth;//园的线宽
private RectF rectF;//圆环区域
private int mWaveHeight;//波峰高度
private int mLeftWaveMoveLength;//波平移的距离，用来控制波的起点位置
private int mWaveColor;//波的颜色
private Paint mPaint;//画笔
private Paint mCirclePaint;//圆环画笔
private Paint mBorderPaint;//边界画笔
private int mBorderWidth=4;//边界宽度
private Paint mTextPaint;//文字画笔
private Path mPath;//绘画线
private List<Point> mPoints;//点的集合
private boolean isMeasure = false;//是否已测量过
private boolean isCircle=false;//是否圆形默认false，可属性代码设置
//处理消息
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
initWaveMove();
}
};
/**
* 初始化波的移动
*/
private void initWaveMove(){
mLeftWaveMoveLength+=mSpeed;//波向右移动距离增加mSpeed;
if (mLeftWaveMoveLength>=mWaveLength){//当增加到一个波长时回复到0
mLeftWaveMoveLength=0;
}
invalidate();
}
public LD_WaveView(Context context) {
this(context, null);
}
public LD_WaveView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public LD_WaveView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
getAttr(context, attrs, defStyleAttr);
init();
}
/**
* 初始化画笔
*/
private void init() {
mPoints = new ArrayList<Point>();
//波浪轨迹画笔
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setColor(mWaveColor);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPath = new Path();
//文字画笔
mTextPaint=new Paint();
mTextPaint.setColor(Color.RED);
mTextPaint.setTextAlign(Paint.Align.CENTER);
mTextPaint.setTextSize(48);
//圆环画笔
mCirclePaint=new Paint();
mCirclePaint.setAntiAlias(true);
mCirclePaint.setColor(Color.WHITE);
mCirclePaint.setStyle(Paint.Style.STROKE);
//边界线画笔
mBorderPaint=new Paint();
mBorderPaint.setAntiAlias(true);
mBorderPaint.setColor(mWaveColor);
mBorderPaint.setStrokeWidth(mBorderWidth);
mBorderPaint.setStyle(Paint.Style.STROKE);
}
/**
* 获取自定义的属性值
*
* @param attrs
*/
private void getAttr(Context context, AttributeSet attrs, int defStyle) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.LD_WaveView, defStyle, 0);
mWaveColor = a.getColor(R.styleable.LD_WaveView_wave_color, Color.RED);
isCircle=a.getBoolean(R.styleable.LD_WaveView_wave_circle,false);
a.recycle();
}
/**
*
* @param widthMeasureSpec
* @param heightMeasureSpec
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (!isMeasure&&Math.abs(getMeasuredHeight()-getMeasuredWidth())<50) {//只计算一次就够了 ，relativelayout的时候要绘制两次 加个宽高判断
mViewHeight = getMeasuredHeight();
mViewWidth = getMeasuredWidth();
mLevelLine = mViewHeight; //初始化波的准位线 起始位视图最底部
{
mLevelLine = mViewHeight * (100-mProgress) / 100;
if (mLevelLine < 0) mLevelLine = 0;
}
//计算波峰值
mWaveHeight = mViewHeight / 20;//波峰暂定为view高度的1/20，如果需要设置 可设置set方法赋值;
mWaveLength = getMeasuredWidth();
//计算所有的点 这里取宽度为整个波长 往左再延伸一个波长 两个波长则需要9个点
for (int i = 0; i < 9; i++) {
int y = 0;
switch (i % 4) {
case 0:
y = mViewHeight;
break;
case 1:
y =mViewHeight+ mWaveHeight;
break;
case 2:
y = mViewHeight;
break;
case 3:
y = mViewHeight-mWaveHeight;
break;
}
Point point = new Point(-mWaveLength + i * mWaveLength / 4, y);
mPoints.add(point);
}
/**
* 计算圆环宽度
*/
int mIncircleRadius=mViewHeight<mViewWidth?mViewHeight/2:mViewWidth/2;//内切圆半径
int mcircumcircleRadius= (int) (Math.sqrt((float)(Math.pow(mViewHeight/2,2)+Math.pow(mViewWidth/2,2)))+0.5);//外接圆半径
int radius=mcircumcircleRadius/2+mIncircleRadius/2;
rectF=new RectF(mViewWidth/2-radius,mViewHeight/2-radius,mViewWidth/2+radius,mViewHeight/2+radius);
mStrokeWidth=mcircumcircleRadius-mIncircleRadius;
mCirclePaint.setStrokeWidth(mStrokeWidth);//线是有宽度的 采用了这种方式画圆环
isMeasure = true;
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/**
* 绘制线条
*/
mPath.reset();
int i = 0;
mPath.moveTo(mPoints.get(0).getX()+mLeftWaveMoveLength, mPoints.get(0).getY()-mViewHeight*mProgress/100);
for (; i < mPoints.size() - 2; i += 2) {
mPath.quadTo(mPoints.get(i + 1).getX()+mLeftWaveMoveLength, mPoints.get(i + 1).getY()-mViewHeight*mProgress/100, mPoints.get(i + 2).getX()+mLeftWaveMoveLength, mPoints.get(i + 2).getY()-mViewHeight*mProgress/100);
}
mPath.lineTo(mPoints.get(i).getX()+mLeftWaveMoveLength, mViewHeight);
mPath.lineTo(mPoints.get(0).getX()+mLeftWaveMoveLength, mViewHeight);
mPath.close();
/**
* 绘制轨迹
*/
canvas.drawPath(mPath,mPaint);
Rect rect = new Rect();
String progress=String.format("%d%%",mProgress);
mTextPaint.getTextBounds(progress,0,progress.length(), rect);
int textHeight = rect.height();
if (mProgress>=50)//如果进度达到50 颜色变为白色，没办法啊，进度在中间 不变颜色看不到
mTextPaint.setColor(Color.WHITE);
else
mTextPaint.setColor(mWaveColor);
canvas.drawText(progress,0,progress.length(),mViewWidth/2,mViewHeight/2+textHeight/2,mTextPaint);
if (isCircle) {
/**
* 绘制圆环
*/
canvas.drawArc(rectF, 0, 360, true, mCirclePaint);
Paint circlePaint = new Paint();
circlePaint.setStrokeWidth(5);
circlePaint.setColor(Color.WHITE);
circlePaint.setAntiAlias(true);
circlePaint.setStyle(Paint.Style.STROKE);
canvas.drawCircle(mViewWidth / 2, mViewHeight / 2, mViewHeight / 2, circlePaint);
/**
* 绘制边界
*/
mBorderPaint.setStrokeWidth(mBorderWidth/2);
canvas.drawCircle(mViewWidth/2,mViewHeight/2,mViewHeight/2-mBorderWidth/2,mBorderPaint);
}else {
/**
* 绘制矩形边框
*/
canvas.drawRect(0,0,mViewWidth,mViewHeight,mBorderPaint);
}
//
handler.sendEmptyMessageDelayed(0,mTimeStep);
}
/**
* 设置进度 基准线
* @param mProgress
*/
public void setmProgress(int mProgress) {
this.mProgress = mProgress;
mLevelLine=(100-mProgress)*mViewHeight/100;
}
/**
* 设置是否为圆形
* @param circle
*/
public void setCircle(boolean circle) {
isCircle = circle;
}
}
自定义属性
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="LD_WaveView"> <attr name="wave_color" format="color"></attr> <attr name="wave_circle" format="boolean"></attr> </declare-styleable> </resources>
总结
好了，以上就是这篇文章的全部内容了，代码里备注应该还算比较清楚了，希望能对一些人有一些帮助,瑕疵不足之处欢迎指正，或者有好的建议。也可以留言交流。
