本文实例为大家分享了Android实现仿网易音乐唱片播放效果的具体代码，供大家参考，具体内容如下
效果图：
在values中创建attrs.xml文件
//中间图片的半径 //图片 //唱片旋转的速度
创建GramophoneView
public class GramophoneView extends View {
private final float DEFUALT_DISK_ROTATE_SPEED = 1f;
private final float DEFAULT_PICTURE_RADIU = 200; // 中间图片默认半径
private final float DEFUALT_PAUSE_NEEDLE_DEGREE = -45; // 暂停状态时唱针的旋转角度
private final float DEFUALT_PLAYING_NEEDLE_DEGREE = -15; // 播放状态时唱针的旋转角度
private int pictureRadiu; // 中间图片的半径
//指针
private int smallCircleRadiu = 20; // 唱针顶部小圆半径
private int bigCircleRadiu = 30; // 唱针顶部大圆半径
private int shortArmLength;
private int longArmleLength; // 唱针手臂，较长那段的长度
private int shortHeadLength; // 唱针的头，较短那段的长度
private int longHeadLength;
private Paint needlePaint;
//唱片
private float halfMeasureWidth;
private int diskRingWidth; // 黑色圆环宽度
private float diskRotateSpeed; // 唱片旋转速度
private Bitmap pictureBitmap;
private Paint diskPaint;
//状态控制
private boolean isPlaying;
private float currentDiskDegree; // 唱片旋转角度
private float currentNeddleDegree = DEFUALT_PLAYING_NEEDLE_DEGREE; // 唱针旋转角度
public GramophoneView(Context context) {
this(context, null);
}
public GramophoneView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
needlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
diskPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.GramophoneView);
//拿到xml中的图片和图片半径和，旋转的度数
pictureRadiu = (int) typedArray.getDimension(R.styleable.GramophoneView_picture_radiu, DEFAULT_PICTURE_RADIU);
diskRotateSpeed = typedArray.getFloat(R.styleable.GramophoneView_disk_rotate_speed, DEFUALT_DISK_ROTATE_SPEED);
Drawable drawable = typedArray.getDrawable(R.styleable.GramophoneView_src);
if (drawable == null) {
pictureBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
} else {
pictureBitmap = ((BitmapDrawable) drawable).getBitmap();
}
//初始化唱片的变量
diskRingWidth = pictureRadiu >> 1;
shortHeadLength = (pictureRadiu + diskRingWidth) / 15; //图片半径和黑色圆环的和 等于 指针的总长度
longHeadLength = shortHeadLength << 1; //左移相当于乘以2
shortArmLength = longHeadLength << 1;
longArmleLength = shortArmLength << 1;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//我们想要的理想宽高
int width = (pictureRadiu + diskRingWidth) * 2;
int hight = (pictureRadiu + diskRingWidth) * 2 + longArmleLength;
//根据我们理想的宽和高 和xml中设置的宽高，按resolveSize规则做最后的取舍
//resolveSize规则 1、精确模式，按
int measureWidth = resolveSize(width, widthMeasureSpec);
int measureHeight = resolveSize(hight, heightMeasureSpec);
setMeasuredDimension(measureWidth, measureHeight);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
halfMeasureWidth = getMeasuredWidth() >> 1;
drawDisk(canvas);
drawNeedle(canvas);
if (currentNeddleDegree > DEFUALT_PAUSE_NEEDLE_DEGREE) {
invalidate();
}
}
private void drawDisk(Canvas canvas) {
currentDiskDegree = currentDiskDegree % 360 + diskRotateSpeed;
canvas.save();
canvas.translate(halfMeasureWidth, longArmleLength + diskRingWidth + pictureRadiu);
canvas.rotate(currentDiskDegree);
diskPaint.setColor(Color.BLACK);
diskPaint.setStyle(Paint.Style.STROKE);
diskPaint.setStrokeWidth(pictureRadiu / 2);
canvas.drawCircle(0, 0, pictureRadiu + diskRingWidth / 2, diskPaint);
Path path = new Path(); // 裁剪的path路径 （为了裁剪成圆形图片，其实是将画布剪裁成了圆形）
path.addCircle(0, 0, pictureRadiu, Path.Direction.CW);
canvas.clipPath(path);
Rect src = new Rect(); //将要画bitmap的那个范围
src.set(0, 0, pictureBitmap.getWidth(), pictureBitmap.getHeight());
Rect dst = new Rect();
dst.set(-pictureRadiu, -pictureRadiu, pictureRadiu, pictureRadiu); //将要将bitmap画要坐标系的那个位置
canvas.drawBitmap(pictureBitmap, src, dst, null);
canvas.restore();
}
private void drawNeedle(Canvas canvas) {
canvas.save();
//移动坐标原点，画指针第一段
canvas.translate(halfMeasureWidth, 0);
canvas.rotate(currentNeddleDegree);
needlePaint.setColor(Color.parseColor("#C0C0C0"));
needlePaint.setStrokeWidth(20);
canvas.drawLine(0, 0, 0, longArmleLength, needlePaint);
//画指针第二段
canvas.translate(0, longArmleLength);
canvas.rotate(-30);
canvas.drawLine(0, 0, 0, shortArmLength, needlePaint);
//画指针第三段
canvas.translate(0, shortArmLength);
needlePaint.setStrokeWidth(30);
canvas.drawLine(0, 0, 0, longHeadLength, needlePaint);
//画指针的第四段
canvas.translate(0, longHeadLength);
needlePaint.setStrokeWidth(45);
canvas.drawLine(0, 0, 0, shortHeadLength, needlePaint);
canvas.restore();
//画指针的支点
canvas.save();
canvas.translate(halfMeasureWidth, 0);
needlePaint.setColor(Color.parseColor("#8A8A8A"));
needlePaint.setStyle(Paint.Style.FILL);
canvas.drawCircle(0, 0, bigCircleRadiu, needlePaint);
needlePaint.setColor(Color.parseColor("#C0C0C0"));
canvas.drawCircle(0, 0, smallCircleRadiu, needlePaint);
canvas.restore();
//当前如果是播放的话，就移动到播放的位置 ，因为逆时针旋转度数是负的所以，- + 需要注意
if (isPlaying) {
if (currentNeddleDegree < DEFUALT_PLAYING_NEEDLE_DEGREE) { //不是暂停状态，就是播放状态，或者是切换中状态
currentNeddleDegree += 3; //切换中状态指针是要有动画效果的，所有要改变指针的度数
}
} else {
if (currentNeddleDegree > DEFUALT_PAUSE_NEEDLE_DEGREE) {
currentNeddleDegree -= 3;
}
}
}
public void pauseOrstart() {
isPlaying = !isPlaying;
invalidate();
}
public void setPictureRadius(int pictureRadius) {
this.pictureRadiu = pictureRadius;
}
public void setDiskRotateSpeed(float diskRotateSpeed) {
this.diskRotateSpeed = diskRotateSpeed;
}
public void setPictureRes(int resId) {
pictureBitmap = BitmapFactory.decodeResource(getContext().getResources(), resId);
invalidate();
}
}
activity_main.xml
MainActivity
public class MainActivity extends AppCompatActivity {
private GramophoneView gramophoneView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gramophoneView = (GramophoneView) findViewById(R.id.gramopone);
}
public void pauseOrstart(View view) {
gramophoneView.pauseOrstart();
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。
