編輯:關於Android編程
一、百度在線音樂旋轉木馬效果
就上面那個,當音樂在播放的時候,那個光碟輪子在轉,就想旋轉木馬一般。感覺好好玩啊。
碰巧想起前陣子做音樂播放器,哎,那這個也可以做在手機的音樂播放器上,這樣就代替了進度條了。
一想到,就興奮,於是,首先畫圓形,然後放置背景圖片,然後使用動畫旋轉。當音樂播放時,同時
開始播放圓形圖片的動畫,當音樂暫停時,暫停旋轉;當音樂停止播放時,就停止動畫,圖片回到原點。
二、效果
三、實現代碼
(1)MainActivity
<span >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(); } }</span><span > </span>
(2)畫圓的控件,這部分代碼參考了網友的。
<span >public class RoundImageView extends ImageView { private int mBorderThickness = 0; private Context mContext; private int defaultColor = 0xFFFFFFFF; // 如果只有其中一個有值,則只畫一個圓形邊框 private int mBorderOutsideColor = 0; private int mBorderInsideColor = 0; // 控件默認長、寬 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(); } // 保證重新讀取圖片後不會因為圖片大小而改變控件寬、高的大小(針對寬、高為wrap_content布局的imageview,但會導致margin無效) // if (defaultWidth != 0 && defaultHeight != 0) { // LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( // defaultWidth, defaultHeight); // setLayoutParams(params); // } int radius = 0; if (mBorderInsideColor != defaultColor && mBorderOutsideColor != defaultColor) {// 定義畫兩個邊框,分別為外圓邊框和內圓邊框 radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - 2 * mBorderThickness; // 畫內圓 drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor); // 畫外圓 drawCircleBorder(canvas, radius + mBorderThickness + mBorderThickness / 2, mBorderOutsideColor); } else if (mBorderInsideColor != defaultColor && mBorderOutsideColor == defaultColor) {// 定義畫一個邊框 radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness; drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderInsideColor); } else if (mBorderInsideColor == defaultColor && mBorderOutsideColor != defaultColor) {// 定義畫一個邊框 radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2 - mBorderThickness; drawCircleBorder(canvas, radius + mBorderThickness / 2, mBorderOutsideColor); } else {// 沒有邊框 radius = (defaultWidth < defaultHeight ? defaultWidth : defaultHeight) / 2; } Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius); canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight / 2 - radius, null); } /** * 獲取裁剪後的圓形圖片 * * @param radius * 半徑 */ public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) { Bitmap scaledSrcBmp; int diameter = radius * 2; // 為了防止寬高不相等,造成圓形圖片變形,因此截取長方形中處於中間位置最大的正方形圖片 int bmpWidth = bmp.getWidth(); int bmpHeight = bmp.getHeight(); int squareWidth = 0, squareHeight = 0; int x = 0, y = 0; Bitmap squareBitmap; if (bmpHeight > bmpWidth) {// 高大於寬 squareWidth = squareHeight = bmpWidth; x = 0; y = (bmpHeight - bmpWidth) / 2; // 截取正方形圖片 squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth, squareHeight); } else if (bmpHeight < bmpWidth) {// 寬大於高 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; } /** * 邊緣畫圓 */ private void drawCircleBorder(Canvas canvas, int radius, int color) { Paint paint = new Paint(); /* 去鋸齒 */ paint.setAntiAlias(true); paint.setFilterBitmap(true); paint.setDither(true); paint.setColor(color); /* 設置paint的 style 為STROKE:空心 */ paint.setStyle(Paint.Style.STROKE); /* 設置paint的外框寬度 */ paint.setStrokeWidth(mBorderThickness); canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint); } }</span><span > </span>
以上就是Android 實現旋轉木馬的音樂效果,有需要的朋友可以參考下。
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