Android 笔记之自定义音量控件

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我是靠谱客的博主俊逸店员，最近开发中收集的这篇文章主要介绍Android 笔记之自定义音量控件，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

第一步：

点击事件会出现弹窗popupwindow的初始化，在弹窗里显示自定义音量控件。

selfDefinedSound= LayoutInflater.from(MainActivity.this).inflate(R.layout.activity_sound, null);//拿到xml布局的view
sound= (SelfDefinedSound) selfDefinedSound.findViewById(R.id.sound);//拿到自定义的音量控件
sound.setNotifyListener(this);
soundPopupWindow=new PopupWindow(MainActivity.this);
soundPopupWindow.setContentView(selfDefinedSound);
soundPopupWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.soundstyle));
soundPopupWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
soundPopupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
soundPopupWindow.setFocusable(true);

soundPopupWindow.setOutsideTouchable(true);

第二步：

自定义的音量控件：

public class SelfDefinedSound extends View {
private int thickness = 13;
Paint paint;
private Notify notify;
//音量的总个数
private int size = 12;
//音量的大小
private int istrue = 10;
//音量间的间距
private int distance = 15;
public SelfDefinedSound(Context context, AttributeSet attrs) {//一定要写，不然在xml文件中会报错！
super(context, attrs);
paint=new Paint();
}

public SelfDefinedSound(Context context) {
super(context);
paint=new Paint();
}

@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
float x = event.getX();
if (x > getRight() / 2) {
jian();
notify.option(ConstantCommands.MINUS_SOUND);
} else {
jia();
notify.option(ConstantCommands.ADD_SOUND);
}
}
return true;
}
//加
public void jia() {
if (istrue < size) {
istrue += 1;
invalidate();
}
}
//减
public void jian() {
if (istrue > 0) {
istrue -= 1;
invalidate();
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = 0;
int height = 0;
// 设置宽度
int specMode = MeasureSpec.getMode(widthMeasureSpec);
int specSize = MeasureSpec.getSize(widthMeasureSpec);
switch (specMode)
{
case MeasureSpec.EXACTLY: // 明确指定
width = specSize;
break;
case MeasureSpec.AT_MOST:
width = getPaddingLeft() + getPaddingRight();
break;
}

// 设置高度
specMode = MeasureSpec.getMode(heightMeasureSpec);
specSize = MeasureSpec.getSize(heightMeasureSpec);
switch (specMode)
{
case MeasureSpec.EXACTLY:
height = specSize;
break;
case MeasureSpec.AT_MOST:
height = width / 20;
break;
}

setMeasuredDimension(width, height);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
paint.setDither(true);
//防锯齿
paint.setAntiAlias(true);
//设置画笔的宽度
paint.setStrokeWidth(thickness);
//画笔颜色
paint.setColor(0xff4AD662);
//设置样式为空心
paint.setStyle(Paint.Style.STROKE);
//定义线段形状-设置了这个之后线段的开头和结尾都会变得有弧度
paint.setStrokeCap(Paint.Cap.ROUND);
int a = getWidth() / 2;
//因为绘制的圆环是以画笔的宽度来决定内院和外圆的距离的所以要/2
int b = a - thickness / 2;
//参数为矩形的四个点的坐标
RectF f = new RectF(a - b, a - b, a + b, a + b);
//绘制圆弧参数为矩形起始位置结束距离画笔

//总角度
int z = 250;
//每一个音量所占据的角度
int one = (z - ((size - 1) * distance)) / size;
//圆弧的起始位置
int s = -180 - (z - 180) / 2;
//绘制选中
for (int i = 1; i <= istrue; i++) {
//绘制圆弧参数为矩形起始位置结束距离画笔
canvas.drawArc(f, s, one, false, paint);//

　参数：（中文）　　oval - 　　　　用于确定圆弧形状与尺寸的椭圆边界（即椭圆外切矩形）　　startAngle - 开始角度（以时钟3点的方向为0°，顺时针为正方向）　　sweepAngle - 扫过角度（以时钟3点的方向为0°，顺时针为正方向）　　useCenter - 是否包含圆心　　paint - 绘制圆弧的画笔

s = s + one + distance;
}
paint.setColor(0xaa25221C);
//绘制未选中
for (int i = 1; i <= size - istrue; i++) {
canvas.drawArc(f, s, one, false, paint);
s = s + one + distance;
}
int record=0;
BitmapFactory.Options options=new BitmapFactory.Options();
// options.inJustDecodeBounds=true;
// BitmapFactory.decodeResource(getResources(), R.drawable.sound,options);
// options.inSampleSize=calculateInSampleSize(options,50,50);
// options.inJustDecodeBounds=false;
if (istrue==0) {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.mute, options);
int c = (getWidth() - bitmap.getWidth()) / 2;
record=c;
//参数为所需要绘制的bitmap 左边位置顶部位置画笔
canvas.drawBitmap(bitmap, c, c, paint);
}
else
{
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.sound, options);
int c = (getWidth() - bitmap.getWidth()) / 2;
record=c;
//参数为所需要绘制的bitmap 左边位置顶部位置画笔
canvas.drawBitmap(bitmap, c, c, paint);
}
Bitmap add=BitmapFactory.decodeResource(getResources(), R.drawable.add,options);
//参数为所需要绘制的bitmap 左边位置顶部位置画笔
canvas.drawBitmap(add, (record-add.getWidth())/2,(getHeight()-add.getHeight())/2, paint);
Bitmap minus=BitmapFactory.decodeResource(getResources(), R.drawable.minus,options);
//参数为所需要绘制的bitmap 左边位置顶部位置画笔
canvas.drawBitmap(minus, 3/2*getWidth()-record/2-minus.getWidth()/2,(getHeight()-minus.getHeight())/2, paint);
}

private int calculateInSampleSize(BitmapFactory.Options options, int i, int i1) {
int height=options.outHeight;
int width=options.outWidth;
int inSampleSize=1;
if(height>i||width>i1)
{
int halfHeight=height/2;
int halfWidth=width/2;
while ((halfHeight/inSampleSize)>=i&&(halfWidth/inSampleSize)>=i1)
{
inSampleSize*=2;
}
}
return inSampleSize;
}
public void setNotifyListener(Notify notify)
{
this.notify=notify;
}
public interface Notify
{
void option(int option);
}
}

第三步：

设置计时，8秒

public class SoundThread extends Thread
{
@Override
public void run() {
while (flag) {
if (System.currentTimeMillis() - time > 8000) {
Message message=activityHandler.obtainMessage();
message.what=ConstantCommands.DISMISS_SOUND;
activityHandler.sendMessage(message);//关闭弹窗
flag=false;
}
}
}
}