已经有好久没有写我的文章了，想自己已经快脱离这个行业了，现在想起来也是挺逗的，也是自己偷懒吧。
最近项目中有一些自定义的view需要自己做了，所以我就揽下了一个任务。就是声音采集的时候的动画。当然这种动画在网上有好多种，我就想记录一下思路，以免自己给忘记了。
效果图
初始化代码
核心代码
kotlin代码：
private fun drawSegment(canvas: Canvas?) {
for (item in -(size /2)..(size /2)) {
var actionX =interval * item +centerX
var moveY = moveY()
canvas!!.save()
canvas!!.drawLine(
actionX.toFloat(),
(centerY - moveY).toFloat(),
actionX.toFloat(),
(centerY + moveY).toFloat(),
paint
)
canvas!!.restore()
}
if (range !=0)
postInvalidateDelayed(100L)
}
java代码：
private void drawSegment(Canvas canvas) {
for (int i = -size /2; i
int actionX =interval * i +centerX;
int moveY = moveY();
canvas.save();
canvas.drawLine(
actionX,
(centerY - moveY),
actionX,
(centerY + moveY),
paint
);
canvas.restore();
}
if (range !=0)
postInvalidateDelayed(100L);
}
画指定的条目线，size是初始定义的条目数量，从中心扩散条目，这样布局会平均一点。效果可以看效果图。
波纹跳动核心代码：
kotlin代码：
private fun moveY(): Int {
if (range ==0) {
range =1
}
var rand = Random().nextInt(range)
if (rand ==0) {
rand =1
}
var moveY = Random().nextInt(rand)
if (moveY ==0) {
moveY =1
}
return moveY
}
java代码：
private int moveY() {
if (range ==0) {
range =1;
}
int rand =new Random().nextInt(range);
if (rand ==0) {
rand =1;
}
int moveY =new Random().nextInt(rand);
if (moveY ==0) {
moveY =1;
}
return moveY;
}
通过幅度range来计算变化的大小moveY。这个是条目的高度，通过变化高度来实现跳动的视觉效果。而moveY就是通过range的两次随机数来获取的。代码很清楚。
这样就完成了非常简单的语音波动VIEW，代码非常简单。当然也留了一个坑，哈哈！
完整的代码
kotlin代码：
class RecordingKtView : View {
private var paint: Paint? = Paint(Paint.ANTI_ALIAS_FLAG)
/**
* 跳动的条目熟练
*/
private var size =36
/**
* 中心x
*/
private var centerX =0
/**
* 中心y
*/
private var centerY =0
/**
* 间隔长度
*/
private var interval =0
/**
* 跳动幅度
*/
var range: Int =0
//初始化数据
constructor(context: Context?) :super(context)
constructor(context: Context?, attrs: AttributeSet?) :super(context, attrs)
constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) :super(context, attrs, defStyleAttr)
init {
paint!!.color = Color.GREEN
paint!!.strokeWidth =5f
paint!!.strokeCap = Paint.Cap.ROUND
}
override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
super.onSizeChanged(w, h, oldw, oldh)
centerX = w /2
centerY = h /2
interval = w /size
}
override fun onDraw(canvas: Canvas?) {
super.onDraw(canvas)
drawSegment(canvas)
}
private fun drawSegment(canvas: Canvas?) {
for (itemin -(size /2)..(size /2)) {
var actionX =interval * item +centerX
var moveY = moveY()
canvas!!.save()
canvas!!.drawLine(
actionX.toFloat(),
(centerY - moveY).toFloat(),
actionX.toFloat(),
(centerY + moveY).toFloat(),
paint
)
canvas!!.restore()
}
if (range !=0)
postInvalidateDelayed(100L)
}
private fun moveY(): Int {
if (range ==0) {
range =1
}
var rand = Random().nextInt(range)
if (rand ==0) {
rand =1
}
var moveY = Random().nextInt(rand)
if (moveY ==0) {
moveY =1
}
return moveY
}
}
java代码：
public class RecordingView extends View {
private Paint paint;
/**
* 条目数量
*/
private int size =36;
/**
* 屏幕中心x
*/
private int centerX =0;
/**
* 屏幕中心y
*/
private int centerY =0;
/**
* 间隔长度
*/
private int interval =0;
/**
* 跳动幅度
*/
private int range =0;
public RecordingView(Context context) {
super(context);
init();
}
public RecordingView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public RecordingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
paint =new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.GREEN);
}
/**
* 改变跳的幅度
* @param sing
*/
public void setRange(int sing) {
this.range = sing;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
centerX = w /2;
centerY = h /2;
interval = w /size;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawSegment(canvas);
}
private void drawSegment(Canvas canvas) {
for (int i = -size /2; i
int actionX =interval * i +centerX;
int moveY = moveY();
canvas.save();
canvas.drawLine(
actionX,
(centerY - moveY),
actionX,
(centerY + moveY),
paint
);
canvas.restore();
}
if (range !=0)
postInvalidateDelayed(100L);
}
private int moveY() {
if (range ==0) {
range =1;
}
int rand =new Random().nextInt(range);
if (rand ==0) {
rand =1;
}
int moveY =new Random().nextInt(rand);
if (moveY ==0) {
moveY =1;
}
return moveY;
}
}
