仿QQ音乐播放器播放音乐时专辑图片的圆形和旋转

完整Demo放在资源上：http://download.csdn.net/detail/zhangli_/9420431

下载Demo跑一次就知道代码的原理，我还是将代码写上来。

一个工具类，进行图片的圆形处理和旋转的代码，CircleImageView：

package com.zhangli.myapplication;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.BitmapShader;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.ColorFilter;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.RectF;import android.graphics.Shader;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.ColorDrawable;import android.graphics.drawable.Drawable;import android.net.Uri;import android.os.AsyncTask;import android.util.AttributeSet;import android.widget.ImageView;public class CircleImageView extends ImageView {private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;private static final int COLORDRAWABLE_DIMENSION = 2;private static final int DEFAULT_BORDER_WIDTH = 0;private static final int DEFAULT_BORDER_COLOR = Color.BLACK;private final RectF mDrawableRect = new RectF();private final RectF mBorderRect = new RectF();private final Matrix mShaderMatrix = new Matrix();private final Paint mBitmapPaint = new Paint();private final Paint mBorderPaint = new Paint();private int mBorderColor = DEFAULT_BORDER_COLOR;private int mBorderWidth = DEFAULT_BORDER_WIDTH;private Bitmap mBitmap;private BitmapShader mBitmapShader;private int mBitmapWidth;private int mBitmapHeight;private float mDrawableRadius;private float mBorderRadius;private ColorFilter mColorFilter;private boolean mReady;private boolean mSetupPending;public CircleImageView(Context context) {super(context);init();}public CircleImageView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public CircleImageView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);TypedArray a = context.obtainStyledAttributes(attrs,R.styleable.CircleImageView, defStyle, 0);mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH);mBorderColor = a.getColor(R.styleable.CircleImageView_border_color,DEFAULT_BORDER_COLOR);a.recycle();init();}private void init() {super.setScaleType(SCALE_TYPE);mReady = true;if (mSetupPending) {setup();mSetupPending = false;}}@Overridepublic ScaleType getScaleType() {return SCALE_TYPE;}@Overridepublic void setScaleType(ScaleType scaleType) {if (scaleType != SCALE_TYPE) {throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));}}@Overridepublic void setAdjustViewBounds(boolean adjustViewBounds) {if (adjustViewBounds) {throw new IllegalArgumentException("adjustViewBounds not supported.");}}@Overrideprotected void onDraw(Canvas canvas) {if (getDrawable() == null) {return;}canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius,mBitmapPaint);if (mBorderWidth != 0) {canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius,mBorderPaint);}}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);setup();}public int getBorderColor() {return mBorderColor;}public void setBorderColor(int borderColor) {if (borderColor == mBorderColor) {return;}mBorderColor = borderColor;mBorderPaint.setColor(mBorderColor);invalidate();}public int getBorderWidth() {return mBorderWidth;}public void setBorderWidth(int borderWidth) {if (borderWidth == mBorderWidth) {return;}mBorderWidth = borderWidth;setup();}@Overridepublic void setImageBitmap(Bitmap bm) {super.setImageBitmap(bm);// LogUtils.d("LOG", "setBitMap");mBitmap = bm;setup();}@Overridepublic void setImageDrawable(Drawable drawable) {super.setImageDrawable(drawable);// LogUtils.d("LOG", "setDrawable");mBitmap = getBitmapFromDrawable(drawable);setup();}@Overridepublic void setImageResource(int resId) {super.setImageResource(resId);// LogUtils.d("LOG", "setImageResource");mBitmap = getBitmapFromDrawable(getDrawable());setup();}@Overridepublic void setImageURI(Uri uri) {super.setImageURI(uri);// LogUtils.d("LOG", "setImageurl");mBitmap = getBitmapFromDrawable(getDrawable());setup();}@Overridepublic void setColorFilter(ColorFilter cf) {if (cf == mColorFilter) {return;}mColorFilter = cf;mBitmapPaint.setColorFilter(mColorFilter);invalidate();}private Bitmap getBitmapFromDrawable(Drawable drawable) {if (drawable == null) {return null;}if (drawable instanceof BitmapDrawable) {return ((BitmapDrawable) drawable).getBitmap();}try {Bitmap bitmap;if (drawable instanceof ColorDrawable) {bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION,COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);} else {bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight(), BITMAP_CONFIG);}Canvas canvas = new Canvas(bitmap);drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());drawable.draw(canvas);return bitmap;} catch (OutOfMemoryError e) {return null;}}private void setup() {if (!mReady) {mSetupPending = true;return;}if (mBitmap == null) {return;}mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP,Shader.TileMode.CLAMP);mBitmapPaint.setAntiAlias(true);mBitmapPaint.setShader(mBitmapShader);mBorderPaint.setStyle(Paint.Style.STROKE);mBorderPaint.setAntiAlias(true);mBorderPaint.setColor(mBorderColor);mBorderPaint.setStrokeWidth(mBorderWidth);mBitmapHeight = mBitmap.getHeight();mBitmapWidth = mBitmap.getWidth();mBorderRect.set(0, 0, getWidth(), getHeight());mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2,(mBorderRect.width() - mBorderWidth) / 2);mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width()- mBorderWidth, mBorderRect.height() - mBorderWidth);mDrawableRadius = Math.min(mDrawableRect.height() / 2,mDrawableRect.width() / 2);updateShaderMatrix();invalidate();}private void updateShaderMatrix() {float scale;float dx = 0;float dy = 0;mShaderMatrix.set(null);if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width()* mBitmapHeight) {scale = mDrawableRect.height() / (float) mBitmapHeight;dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;} else {scale = mDrawableRect.width() / (float) mBitmapWidth;dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;}mShaderMatrix.setScale(scale, scale);mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth,(int) (dy + 0.5f) + mBorderWidth);mShaderMatrix.preRotate(currentRoatate, mBitmapWidth / 2,// 实现图片的旋转mBitmapHeight / 2);mBitmapShader.setLocalMatrix(mShaderMatrix);}// 当前偏移角度private int currentRoatate = 0;public void setRoatate(int roateate) {this.currentRoatate = roateate;setup();}public int getRoatate() {return currentRoatate;}private CdTask task = null;/** * 旋转重置 */public void resetRoatate() {if (task != null) {task.cancel(true);task = null;}currentRoatate = 0;setup();}/** * 旋转暂停 */public void roatatePause() {if (task != null) {task.cancel(true);task = null;}}/** * 旋转开始 */public void roatateStart() {if (task != null) {task.cancel(true);task = null;}task = (CdTask) new CdTask().execute();}/** * 是否设置反转 */public void setRoatateReversal(boolean reversal) {this.isReversal = reversal;}private boolean isReversal = false;// 是否反转private class CdTask extends AsyncTask<Void, Integer, Void> {@Overrideprotected Void doInBackground(Void... params) {try {while (true) {if (isReversal) {if (currentRoatate == 0) {currentRoatate = 359;}currentRoatate--;} else {if (currentRoatate == 359) {currentRoatate = 0;}currentRoatate++;}publishProgress(currentRoatate);Thread.sleep(50);}} catch (InterruptedException e) {e.printStackTrace();}return null;}@Overrideprotected void onProgressUpdate(Integer... values) {setRoatate(values[0]);super.onProgressUpdate(values);}}}

MainActivity:

import com.example.test.weight.CircleImageView;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.view.View;public class MainActivity extends Activity {private CircleImageView civTest;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);civTest = (CircleImageView) findViewById(R.id.civ_test);civTest.setBorderColor(Color.GRAY);civTest.setBorderWidth(8);}public void onViewClick(View v) {switch (v.getId()) {case R.id.bt_start:civTest.roatateStart();break;case R.id.bt_pause:civTest.roatatePause();break;case R.id.bt_reversal:civTest.setRoatateReversal(true);break;case R.id.bt_reset:civTest.resetRoatate();break;}}}

注意：1、在Activity销毁（onDestory）时，要将旋转图片重置一下，以防下次再进行旋转时出现bug；

  2、布局设置的ImageView，是写的那个工具类的路径，比如：com.zhangli.myapplication.CircleImageView。

其他文章：

Android圆形头像CircleImageView:  http://blog.csdn.net/zhangli_/article/details/50518745