記得某天在某個手機看到的效果， 今天實現了一把；先看下效果吧
代碼不多，有興趣的可以看下；
package com.qypt.just.just_study_app;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.animation.LinearInterpolator;
/**
* Justson
* Created by Administrator on 2016/7/3.
*/
public class CircleView extends View {
private Paint paint;
private int defCircleColor;
private int defRingColor;
private int defWidth = 160;
private int defHeight = 160;
private RectF rectF = new RectF();
private float rx;
private float ry;
private static final int bouder = 3;
private ObjectAnimator objectAnimator;
public CircleView(Context context) {
super(context);
init(context, null, 0);
}
public CircleView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs, 0);
}
public CircleView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs, 0);
}
private void init(Context context, AttributeSet attrs, int defStyleAttr) {
paint = new Paint();
paint.setColor(defCircleColor);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(1);
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setAntiAlias(true);
paint.setDither(true);
int density = (int) context.getResources().getDisplayMetrics().density;
defWidth = defWidth * density;
defHeight = density * defHeight;
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.CircleView, defStyleAttr, 0);
int count = ta.getIndexCount();
for (int i = 0; i < count; i++) {
int index = ta.getIndex(i);
switch (index) {
case R.styleable.CircleView_circleColor:
defCircleColor = ta.getColor(index, Color.YELLOW);
break;
case R.styleable.CircleView_ringColor:
defRingColor = ta.getColor(index, Color.BLUE);
break;
}
}
if (defCircleColor == 0) {
defCircleColor = Color.parseColor("#335541");
}
if (defRingColor == 0) {
defRingColor = Color.parseColor("#545633");
}
ta.recycle();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
rectF.top = 20f;
rectF.bottom = 20f + h - 40f;
rectF.left = 20f;
rectF.right = 20f + w - 40f;
rx = w / 2;
ry = h / 2;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
this.setMeasuredDimension(widthMode == MeasureSpec.AT_MOST ? defWidth : MeasureSpec.getSize(widthMeasureSpec),
heightMode == MeasureSpec.AT_MOST ? defHeight : MeasureSpec.getSize(heightMeasureSpec));
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
objectAnimator = ObjectAnimator.ofFloat(this,"Rotation",0,359);
objectAnimator.setDuration(6000);
objectAnimator.setInterpolator(new LinearInterpolator());
objectAnimator.setRepeatCount(ValueAnimator.INFINITE);
objectAnimator.start();
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
objectAnimator.cancel();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
paint.setStyle(Paint.Style.STROKE);
paint.setAlpha(130);
canvas.drawArc(rectF, 0, 360, false, paint);
paint.setColor(defCircleColor);
paint.setStyle(Paint.Style.FILL);
paint.setAlpha(230);
canvas.drawCircle(getWidth() / 2, rectF.top, 20, paint);
}
}