Android自定义ViewGroup实现绚丽的仿支付宝咻一咻雷达脉冲效果

public class RadarLayout extends FrameLayout { 
public RadarLayout(Context context) { 
super(context); 
} 
public RadarLayout(Context context, AttributeSet attrs) { 
super(context, attrs); 
} 
public RadarLayout(Context context, AttributeSet attrs, int defStyleAttr) { 
super(context, attrs, defStyleAttr); 
} 
}

public class RadarLayout extends FrameLayout { 
public static final int INFINITE = 0; 
private static final int DEFAULT_COUNT = 4; 
private static final int DEFAULT_COLOR = Color.rgb(0, 116, 193); 
private static final int DEFAULT_DURATION = 7000; 
private static final int DEFAULT_REPEAT = INFINITE; 
private static final int DEFAULT_STROKE_WIDTH = 2; 
private int mCount; 
private int mDuration; 
private int mRepeat; 
private AnimatorSet mAnimatorSet; 
private Paint mPaint; 
private int mColor; 
private float mRadius; 
private float mCenterX; 
private float mCenterY; 
private int mStrokeWidth; 
private boolean mIsStarted; 
private boolean mUseRing; 
public RadarLayout(Context context) { 
super(context); 
initGlobalparams(); 
} 
public RadarLayout(Context context, AttributeSet attrs) { 
super(context, attrs); 
initGlobalparams(); 
} 
public RadarLayout(Context context, AttributeSet attrs, int defStyleAttr) { 
super(context, attrs, defStyleAttr); 
initGlobalparams(); 
} 
private void initGlobalparams() { 
mColor = DEFAULT_COLOR; 
mCount = DEFAULT_COUNT; 
mDuration = DEFAULT_DURATION; 
mRepeat = DEFAULT_REPEAT; 
mUseRing = false; 
mStrokeWidth = dip2px(DEFAULT_STROKE_WIDTH); 
build(); 
} 
public synchronized void start() { 
if (mAnimatorSet == null || mIsStarted) { 
return; 
} 
mAnimatorSet.start(); 
} 
public synchronized void stop() { 
if (mAnimatorSet == null || !mIsStarted) { 
return; 
} 
mAnimatorSet.end(); 
} 
public synchronized boolean isStarted() { 
return (mAnimatorSet != null && mIsStarted); 
} 
public int getCount() { 
return mCount; 
} 
public int getDuration() { 
return mDuration; 
} 
public void setCount(int count) { 
if (count <0) { 
throw new IllegalArgumentException("Count cannot be negative"); 
} 
if (count != mCount) { 
mCount = count; 
reset(); 
invalidate(); 
} 
} 
public void setDuration(int millis) { 
if (millis <0) { 
throw new IllegalArgumentException("Duration cannot be negative"); 
} 
if (millis != mDuration) { 
mDuration = millis; 
reset(); 
invalidate(); 
} 
} 
public void setColor(int color) { 
if (mColor != color) { 
mColor = color; 
reset(); 
invalidate(); 
} 
} 
public void setUseRing(boolean useRing) { 
if (mUseRing != useRing) { 
mUseRing = useRing; 
reset(); 
invalidate(); 
} 
} 
@Override 
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
int width = getMeasuredWidth() - getPaddingLeft() - getPaddingRight(); 
int height = getMeasuredHeight() - getPaddingTop() - getPaddingBottom(); 
// 确定圆的圆点坐标及半径 
mCenterX = width * 0.5f; 
mCenterY = height * 0.5f; 
mRadius = Math.min(width, height) * 0.5f; 
} 
private void clear() { 
stop(); 
removeAllViews(); 
} 
private void build() { 
LayoutParams params = new LayoutParams(MATCH_PARENT, MATCH_PARENT); 
int repeatCount = (mRepeat == INFINITE) &＃63; ObjectAnimator.INFINITE : mRepeat; 
List animators = new ArrayList(); 
for (int index = 0; index 

public class MainActivity extends Activity { 
private RadarLayout layout1; 
private RadarLayout layout2; 
private RadarLayout layout3; 
private RadarLayout layout4; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
layout1 = (RadarLayout) findViewById(R.id.radarlayout1); 
layout2 = (RadarLayout) findViewById(R.id.radarlayout2); 
layout2.setUseRing(true); 
layout2.setCount(2); 
layout3 = (RadarLayout) findViewById(R.id.radarlayout3); 
layout3.setUseRing(false); 
layout3.setColor(Color.RED); 
layout4 = (RadarLayout) findViewById(R.id.radarlayout4); 
layout4.setCount(7); 
layout4.setColor(Color.BLUE); 
layout4.setUseRing(true); 
} 
public void start(View view) { 
layout1.start(); 
layout2.start(); 
layout3.start(); 
layout4.start(); 
} 
}