图片可控旋转效果

经常可以看到QQ音乐播放背景有个旋转的光盘在转动，想了下其实就是一个可以控制播放与停止的图片在旋转，我写了一个demo和大家分享下：
 CircleImageView.class
package com.liw.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;
/**
 * 自定义一个ImageView，这里是创建一个圆
 * @author liw
 *
 */
public class CircleImageView extends ImageView {


private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;//按统一比例缩放图片（保持图片的尺寸比例）便于图片的两维（宽度和高度）等于或者大于相应的视图的维度


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;//旋转角度
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;
}
}


@Override
public ScaleType getScaleType() {
return SCALE_TYPE;
}


@Override
public void setScaleType(ScaleType scaleType) {
if (scaleType != SCALE_TYPE) {
throw new IllegalArgumentException(String.format(
"ScaleType %s not supported.", scaleType));
}
}


@Override
protected 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);
}
}


@Override
protected 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();
}


@Override
public void setImageBitmap(Bitmap bm) {
super.setImageBitmap(bm);
mBitmap = bm;
setup();
}


@Override
public void setImageDrawable(Drawable drawable) {
super.setImageDrawable(drawable);
mBitmap = getBitmapFromDrawable(drawable);
setup();
}


@Override
public 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>  MainActivity.classpackage com.liw.imagerevolve; import com.liw.imagerevolve.R; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.os.CountDownTimer; import android.renderscript.Sampler.Value; import android.view.View; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; public class MainActivity extends Activity {private CircleImageView imageView;private boolean isStart = true;private Thread th;private Button start;private Button stop;TextView tv ;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init1();   }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();}}}} }