最近，虽然公司的安卓开发相对还是挺多，依旧在学习自定义View。不怕实现的简单，慢慢做、慢慢理解。
效果图：
1.先实现自定义圆形ImageView：
首先获取到图片的Bitmap，然后进行裁剪圆形的bitmap，然后在onDraw（）进行绘制圆形图片输出。
import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.support.v7.widget.AppCompatImageView; import android.util.AttributeSet; /** * Created by zachary on 2019/04/08. * 圆形ImageView */ public class MusicView extends AppCompatImageView { private Paint paint; public MusicView(Context context) { this(context,null); } public MusicView(Context context, AttributeSet attrs) { this(context, attrs,0); } public MusicView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); paint = new Paint(); } @Override protected void onDraw(Canvas canvas) { //获取图像资源 Drawable drawable = getDrawable(); if (null != drawable) { Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); Bitmap b = getCircleBitmap(bitmap); //上层 final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight()); //下层 final Rect rectDest = new Rect(0,0,getWidth(),getHeight()); paint.reset(); canvas.drawBitmap(b, rectSrc, rectDest, paint); } else { super.onDraw(canvas); } } /** * 获取圆形图片方法 * @param bitmap * @return Bitmap */ private Bitmap getCircleBitmap(Bitmap bitmap) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xffffffff; final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); //设置抗锯齿 paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); int x = bitmap.getWidth(); //圆形的大小 canvas.drawCircle(x / 2, x / 2, x / 2, paint); //PorterDuff.Mode.SRC_IN模式组合效果 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; } }
2.实现可暂停的旋转效果
因为补间动画（RotateAnimation）只有开始和结束的方法，实现暂停与开始需要记录旋转的角度，而使用属性动画（ObjectAnimator）则可以使用已经封装好的方法，比较适合我们的需求。
import android.animation.ObjectAnimator; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.os.Build; import android.support.annotation.RequiresApi; import android.support.v7.widget.AppCompatImageView; import android.util.AttributeSet; import android.view.animation.LinearInterpolator; /** * Created by zachary on 2019/04/08. * 圆形ImageView，旋转操作（属性动画ObjectAnimator） */ public class MusicView extends AppCompatImageView { private ObjectAnimator objectAnimator; public static final int STATE_PLAYING = 1; //正在播放 public static final int STATE_PAUSE = 2; //暂停 public static final int STATE_STOP = 3; //停止 public int state; private Paint paint; public MusicView(Context context) { this(context,null); } public MusicView(Context context, AttributeSet attrs) { this(context, attrs,0); } public MusicView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); paint = new Paint(); init(); } private void init(){ state = STATE_STOP; //添加旋转动画，旋转中心默认为控件中点 objectAnimator = ObjectAnimator.ofFloat(this, "rotation", 0f, 360f); //设置动画时间：3s objectAnimator.setDuration(3000); //动画：时间线性渐变 objectAnimator.setInterpolator(new LinearInterpolator()); objectAnimator.setRepeatCount(ObjectAnimator.INFINITE); objectAnimator.setRepeatMode(ObjectAnimator.RESTART); } /** * 绘制圆形图片 */ @Override protected void onDraw(Canvas canvas) { Drawable drawable = getDrawable(); if (null != drawable) { Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); Bitmap b = getCircleBitmap(bitmap); //上层 final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight()); //下层 final Rect rectDest = new Rect(0,0,getWidth(),getHeight()); paint.reset(); canvas.drawBitmap(b, rectSrc, rectDest, paint); } else { super.onDraw(canvas); } } /** * 获取圆形图片方法 * @param bitmap * @return Bitmap */ private Bitmap getCircleBitmap(Bitmap bitmap) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xff424242; final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(color); int x = bitmap.getWidth(); canvas.drawCircle(x / 2, x / 2, x / 2, paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; } @RequiresApi(api = Build.VERSION_CODES.KITKAT) public void playMusic(){ if(state == STATE_STOP){ objectAnimator.start(); //动画开始 state = STATE_PLAYING; }else if(state == STATE_PAUSE){ objectAnimator.resume(); //动画重新开始 state = STATE_PLAYING; }else if(state == STATE_PLAYING){ objectAnimator.pause(); //动画暂停 state = STATE_PAUSE; } } public void stopMusic(){ objectAnimator.end(); //动画结束 state = STATE_STOP; } }
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