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.class

package 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 ;

@Override

protected 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() {

@Override

public 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() {

@Override

public 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() {

@Override

public void onClick(View v) {

View.setAnimation(animation);

animation.startNow();

}

});

stop.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

animation.cancel();

}

});

}

private class CircleThread implements Runnable {

public void stopThread() {

isStart = false;

}

@Override

public void run() {

while (isStart) {

imageView.setDegree(imageView.getDegree() + 3);

try {

Thread.sleep(20);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}

}