Android自定义View实现仿网易音乐唱片播放效果

<?xml version="1.0" encoding="utf-8"?><resources>  <declare-styleable name="GramophoneView">    <attr name="picture_radiu" format="dimension" />   //中间图片的半径    <attr name="src" format="reference" />        //图片    <attr name="disk_rotate_speed" format="float" />   //唱片旋转的速度  </declare-styleable></resources>

public class GramophoneView extends View {  /**   * 尺寸计算设计说明：   * 1、唱片有两个主要尺寸：中间图片的半径、黑色圆环的宽度。   * 黑色圆环的宽度 = 图片半径的一半。   * 2、唱针分为“手臂”和“头”，手臂分两段，一段长的一段短的，头也是一段长的一段短的。   * 唱针四个部分的尺寸求和 = 唱片中间图片的半径+黑色圆环的宽度   * 唱针各部分长度 比例——长的手臂：短的手臂：长的头：短的头 = 8:4:2:1   * 3、唱片黑色圆环顶部到唱针顶端的距离 = 唱针长的手臂的长。度   */  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;  }  /**   * 理想的宽高是，取决于picture的 半径的   *   * @param widthMeasureSpec   * @param heightMeasureSpec   */  @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();  }  /**   * 设置图片半径   *   * @param pictureRadius 图片半径   */  public void setPictureRadius(int pictureRadius) {    this.pictureRadiu = pictureRadius;  }  /**   * 设置唱片旋转速度   *   * @param diskRotateSpeed 旋转速度   */  public void setDiskRotateSpeed(float diskRotateSpeed) {    this.diskRotateSpeed = diskRotateSpeed;  }  /**   * 设置图片资源id   *   * @param resId 图片资源id   */  public void setPictureRes(int resId) {    pictureBitmap = BitmapFactory.decodeResource(getContext().getResources(), resId);    invalidate();  }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  tools:context="com.example.customrecord.MainActivity">  <com.example.customrecord.GramophoneView    android:id="@+id/gramopone"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    app:disk_rotate_speed="1"    app:picture_radiu="80dp"    app:src="@drawable/land" />  <Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginTop="60dp"    android:onClick="pauseOrstart"    android:text="切换播放状态" /></LinearLayout>

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();  }}