android自定义WaveView水波纹控件

allprojects {
 repositories {
 ...
 maven { url 'https://jitpack.io' }
 }
}

dependencies {
 compile 'com.github.onlynight:WaveView:1.0.0'
}

<com.github.onlynight.waveview.WaveView
 android:id="@+id/waveView1"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 app:isCircle="false"
 app:period="4"
 app:waveHeightPercent="0.5"
 app:waveRange="15dp"
 app:waveSpeed="10"
 app:waveStrokeWidth="3dp"/>

mWaveView1 = (WaveView) findViewById(R.id.waveView1);

// when you want start wave you should call WaveView#start() method.
mWaveView1.start();

// when you want stop wave you should call WaveView#stop() method.
mWaveView1.stop();

<declare-styleable name="WaveView">

 <!-- define wave speed, example value 10 -->
 <attr name="waveSpeed" format="float"/>

 <!-- define wave range, example value 15dp -->
 <attr name="waveRange" format="dimension|reference"/>

 <!-- define wave 1 color -->
 <attr name="wave1Color" format="color|reference"/>

 <!-- define wave 2 color -->
 <attr name="wave2Color" format="color|reference"/>

 <!-- define wave height percent, the value is between 0 to 1 -->
 <attr name="waveHeightPercent" format="float"/>

 <!-- define paint stroke width, if you want optimizing view,
 you should change the stroke width more-->
 <attr name="waveStrokeWidth" format="dimension|reference"/>

 <!-- if the view is circle -->
 <attr name="isCircle" format="boolean"/>

 <!-- the sine wave period, value range 0 to all -->
 <attr name="period" format="float"/>

</declare-styleable>

private void drawWave(Canvas canvas, int width, int height) {
 setPaint();

 double lineX = 0;
 double lineY1 = 0;
 double lineY2 = 0;
 for (int i = 0; i < width; i += mStrokeWidth) {
 lineX = i;
 if (mIsRunning) {
  lineY1 = mWaveRange * Math.sin((mAngle + i) * Math.PI / 180 / mPeriod) +
   height * (1 - mWaveHeightPercent);
  lineY2 = mWaveRange * Math.cos((mAngle + i) * Math.PI / 180 / mPeriod) +
   height * (1 - mWaveHeightPercent);
 } else {
  lineY1 = 0;
  lineY2 = 0;
 }
 canvas.drawLine((int) lineX, (int) lineY1,
  (int) lineX + 1, height, mWavePaint1);
 canvas.drawLine((int) lineX, (int) lineY2,
  (int) lineX + 1, height, mWavePaint2);
 }
}

@Override
protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);
 if (mIsRunning) {
 int height = getHeight();
 int width = getWidth();

 // 这里要注意执行的顺序
 clipContainer(canvas, width, height);
 drawWave(canvas, width, height);
 }
}

private void clipContainer(Canvas canvas, int width, int height) {
 if (mIsCircle) {
 mContainerPath.reset();
 canvas.clipPath(mContainerPath);
 mContainerPath.addCircle(width / 2, height / 2, width / 2, Path.Direction.CCW);
 canvas.clipPath(mContainerPath, Region.Op.REPLACE);
 }
}