简单实现图片可控旋转效果

      最近一直在用网易云音乐这款APP听歌，今天突然好奇播放器里的专辑图旋转效果，于是自己学习做了一下。有两种实现方式，第一种是使用Animation设定旋转动画，第二种是自定义ImageView属性。下面我将两种实现方式贴出来，分享与大家。

       CircleImageView.class 

package com.dengyy.imagerevolve;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapShader;import android.graphics.Camera;import android.graphics.Canvas;import android.graphics.Color;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.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 = 1;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 boolean mReady;private boolean mSetupPending;private float mRotateDegree = 5;private Camera mCamera = new Camera();public void setDegree(float degree) {mRotateDegree = degree;postInvalidate();}public float getDegree() {return mRotateDegree;}public CircleImageView(Context context) {super(context);}public CircleImageView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public CircleImageView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);super.setScaleType(SCALE_TYPE);mBorderWidth = 0;mBorderColor = 0;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));}}@Overrideprotected void onDraw(Canvas canvas) {if (getDrawable() == null) {return;}Matrix matrix = canvas.getMatrix();matrix.postRotate(mRotateDegree, getWidth() / 2, getHeight() / 2);canvas.concat(matrix);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);mBitmap = bm;setup();}@Overridepublic void setImageDrawable(Drawable drawable) {super.setImageDrawable(drawable);mBitmap = getBitmapFromDrawable(drawable);setup();}@Overridepublic void setImageResource(int resId) {super.setImageResource(resId);mBitmap = getBitmapFromDrawable(getDrawable());setup();}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);mBitmapShader.setLocalMatrix(mShaderMatrix);}}

       activity_main.xml和activity_main_two.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#ffffff"    android:orientation="vertical" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="300dp"        android:background="#ffffff"        android:gravity="center" >        <FrameLayout            android:layout_width="200dp"            android:layout_height="200dp"            android:background="@drawable/image_one" >            <com.dengyy.imagerevolve.CircleImageView                android:id="@+id/img_test"                android:layout_width="150dp"                android:layout_height="150dp"                android:layout_gravity="center"                android:src="@drawable/image_two" />        </FrameLayout>    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:orientation="horizontal" >        <Button            android:id="@+id/start"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1"            android:text="启动" />        <Button            android:id="@+id/stop"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1"            android:text="停止" />    </LinearLayout></LinearLayout>------------------------------------------<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#ffffff"    android:orientation="vertical" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="300dp"        android:background="#ffffff"        android:gravity="center" >        <FrameLayout            android:layout_width="200dp"            android:layout_height="200dp"            android:background="@drawable/image_one" >            <ImageView                android:id="@+id/img_test"                android:layout_width="150dp"                android:layout_height="150dp"                android:layout_gravity="center"                android:src="@drawable/image_two" />        </FrameLayout>    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:orientation="horizontal" >        <Button            android:id="@+id/start"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1"            android:text="启动" />        <Button            android:id="@+id/stop"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1"            android:text="停止" />    </LinearLayout></LinearLayout>

       最重要的MainActivity.class

package com.dengyy.imagerevolve;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.animation.Animation;import android.view.animation.RotateAnimation;import android.widget.Button;import android.widget.ImageView;public class MainActivity extends Activity {private CircleImageView imageView;private boolean isStart = true;private Thread th;private Button start;private Button stop;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init1();//setContentView(R.layout.activity_main_two);//init2();}private void init1() {start = (Button) findViewById(R.id.start);stop = (Button) findViewById(R.id.stop);imageView = (CircleImageView) findViewById(R.id.img_test);final CircleThread st = new CircleThread();th = new Thread(st);start.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (isStart) {try {th.start();} catch (IllegalThreadStateException e) {}} else {th = new Thread(st);th.start();isStart = true;}}});stop.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {st.stopThread();}});}private void init2() {start = (Button) findViewById(R.id.start);stop = (Button) findViewById(R.id.stop);final ImageView View = (ImageView) findViewById(R.id.img_test);/** 设置旋转动画 */final RotateAnimation animation = new RotateAnimation(0f, 360f,Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,0.5f);animation.setDuration(3000);// 设置动画持续时间start.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {View.setAnimation(animation);animation.startNow();}});stop.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {animation.cancel();}});}private class CircleThread implements Runnable {public void stopThread() {isStart = false;}@Overridepublic void run() {while (isStart) {imageView.setDegree(imageView.getDegree() + 3);try {Thread.sleep(20);} catch (InterruptedException e) {e.printStackTrace();}}}}}

                              我的Demo可以点击这里进行下载。