Android开发音乐旋转木马动画,Android 实现旋转木马的音乐效果

一、百度在线音乐旋转木马效果

就上面那个，当音乐在播放的时候，那个光碟轮子在转，就想旋转木马一般。感觉好好玩啊。

碰巧想起前阵子做音乐播放器，哎，那这个也可以做在手机的音乐播放器上，这样就代替了进度条了。

一想到，就兴奋，于是，首先画圆形，然后放置背景图片，然后使用动画旋转。当音乐播放时，同时

开始播放圆形图片的动画，当音乐暂停时，暂停旋转；当音乐停止播放时，就停止动画，图片回到原点。

二、效果

三、实现代码

(1)MainActivity

public class MainActivity extends Activity {

MediaPlayer m1;

ImageView infoOperatingIV;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

infoOperatingIV = (ImageView) findViewById(R.id.infoOperating);

Button play = (Button) findViewById(R.id.play);

Button stop = (Button) findViewById(R.id.stop);

play.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

playMusic();

}

});

stop.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

stopMusic();

}

});

}

private void playMusic() {

m1 = MediaPlayer.create(this, R.raw.quiet);

m1.start();

Animation operatingAnim = AnimationUtils.loadAnimation(this, R.anim.tip);

LinearInterpolator lin = new LinearInterpolator();

operatingAnim.setInterpolator(lin);

if (operatingAnim != null) {

infoOperatingIV.startAnimation(operatingAnim);

}

m1.setOnCompletionListener(new OnCompletionListener() {

@Override

public void onCompletion(MediaPlayer mp) {

mp.stop();

infoOperatingIV.clearAnimation();

}

});

}

private void stopMusic() {

m1.stop();

infoOperatingIV.clearAnimation();

}

}

(2)画圆的控件，这部分代码参考了网友的。

public class RoundImageView extends ImageView {

private int mBorderThickness = 0;

private Context mContext;

private int defaultColor = 0xFFFFFFFF;

// 如果只有其中一个有值，则只画一个圆形边框

private int mBorderOutsideColor = 0;

private int mBorderInsideColor = 0;

// 控件默认长、宽

private int defaultWidth = 0;

private int defaultHeight = 0;

public RoundImageView(Context context) {

super(context);

mContext = context;

}

public RoundImageView(Context context, AttributeSet attrs) {

super(context, attrs);

mContext = context;

setCustomAttributes(attrs);

}

public RoundImageView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

mContext = context;

setCustomAttributes(attrs);

}

private void setCustomAttributes(AttributeSet attrs) {

TypedArray a = mContext.obtainStyledAttributes(attrs, R.styleable.roundedimageview);

mBorderThickness = a.getDimensionPixelSize(R.styleable.roundedimageview_border_thickness, 0);

mBorderOutsideColor = a.getColor(R.styleable.roundedimageview_border_outside_color, defaultColor);

mBorderInsideColor = a.getColor(R.styleable.roundedimageview_border_inside_color, defaultColor);

}

@Override

protected void onDraw(Canvas canvas) {

Drawable drawable = getDrawable();

if (drawable == null) {

return;

}

if (getWidth() == 0 || getHeight() == 0) {

return;

}

this.measure(0, 0);

if (drawable.getClass() == NinePatchDrawable.class)

return;

Bitmap b = ((BitmapDrawable) drawable).getBitmap();

Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

if (defaultWidth == 0) {

defaultWidth = getWidth();

}

if (defaultHeight == 0) {

defaultHeight = getHeight();

}

// 保证重新读取图片后不会因为图片大小而改变控件宽、高的大小(针对宽、高为wrap_content布局的imageview，但会导致margin无效)

// if (defaultWidth != 0 && defaultHeight != 0) {

// LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(

// defaultWidth, defaultHeight);

// setLayoutParams(params);

// }

int radius = 0;

if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框

radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness;

// 画内圆

drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor);

// 画外圆

drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / 2, mBorderOutsideColor);

} else if (mBorderInsideColor != defaultColor && mBorderOutsideColor == defaultColor) {// 定义画一个边框

radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;

drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor);

} else if (mBorderInsideColor == defaultColor && mBorderOutsideColor != defaultColor) {// 定义画一个边框

radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness;

drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderOutsideColor);

} else {// 没有边框

radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2;

}

Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);

canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null);

}

/**

* 获取裁剪后的圆形图片

*

* @param radius

* 半径

*/

public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {

Bitmap scaledSrcBmp;

int diameter = radius * 2;

// 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片

int bmpWidth = bmp.getWidth();

int bmpHeight = bmp.getHeight();

int squareWidth = 0, squareHeight = 0;

int x = 0, y = 0;

Bitmap squareBitmap;

if (bmpHeight > bmpWidth) {// 高大于宽

squareWidth = squareHeight = bmpWidth;

x = 0;

y = (bmpHeight - bmpWidth) / 2;

// 截取正方形图片

squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);

} else if (bmpHeight < bmpWidth) {// 宽大于高

squareWidth = squareHeight = bmpHeight;

x = (bmpWidth - bmpHeight) / 2;

y = 0;

squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight);

} else {

squareBitmap = bmp;

}

if (squareBitmap.getWidth() != diameter || squareBitmap.getHeight() != diameter) {

scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter, diameter, true);

} else {

scaledSrcBmp = squareBitmap;

}

Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(), scaledSrcBmp.getHeight(), Config.ARGB_8888);

Canvas canvas = new Canvas(output);

Paint paint = new Paint();

Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(), scaledSrcBmp.getHeight());

paint.setAntiAlias(true);

paint.setFilterBitmap(true);

paint.setDither(true);

canvas.drawARGB(0, 0, 0, 0);

canvas.drawCircle(scaledSrcBmp.getWidth() / 2, scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2, paint);

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);

bmp = null;

squareBitmap = null;

scaledSrcBmp = null;

return output;

}

/**

* 边缘画圆

*/

private void drawCircleBorder(Canvas canvas, int radius, int color) {

Paint paint = new Paint();

/* 去锯齿 */

paint.setAntiAlias(true);

paint.setFilterBitmap(true);

paint.setDither(true);

paint.setColor(color);

/* 设置paint的　style　为STROKE：空心 */

paint.setStyle(Paint.Style.STROKE);

/* 设置paint的外框宽度 */

paint.setStrokeWidth(mBorderThickness);

canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);

}

}

以上就是Android 实现旋转木马的音乐效果,有需要的朋友可以参考下。