public class SkipView extends View {
public static final int TEXT_SIZE = 30;//文字的大小
public static final int TEXT_MARGIN = 10;//文字距离中间圆边框的间距
public static final int ARC_WIDTH = 8;//外部圆弧的笔画宽度
private float mMeasureTextWidth;
private float mCircleDoubleRadius;
private float mArcDoubleRadius;
private RectF mRectF;
private Paint mArcPaint;
private Paint mCirclePaint;
private Paint mTextPaint;
private Handler mHandler;
public SkipView(Context context) {
super(context);
}
public SkipView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
//文字的画笔
mTextPaint = new Paint();
mTextPaint.setTextSize(TEXT_SIZE);
mTextPaint.setColor(Color.WHITE);
mTextPaint.setAntiAlias(true);
//中间的圆的画笔
mCirclePaint = new Paint();
mCirclePaint.setColor(Color.GRAY);
mCirclePaint.setAntiAlias(true);
//外部圆弧的画笔
mArcPaint = new Paint();
mArcPaint.setColor(Color.RED);
mArcPaint.setAntiAlias(true);
mArcPaint.setStyle(Paint.Style.STROKE);
mArcPaint.setStrokeWidth(ARC_WIDTH);
//1 文字的宽度 2 文字距离中间圆边框的间距 3 外部圆弧的笔画宽度
mMeasureTextWidth = mTextPaint.measureText("跳过");
//计算中间的圆的直径
mCircleDoubleRadius = mMeasureTextWidth + TEXT_MARGIN * 2;
//计算外部的圆狐的直径
mArcDoubleRadius = mCircleDoubleRadius + 2 * ARC_WIDTH;
//准备一个矩形出来,画圆弧
mRectF = new RectF(0+ARC_WIDTH/2, 0+ARC_WIDTH/2,
mArcDoubleRadius-ARC_WIDTH/2, mArcDoubleRadius-ARC_WIDTH/2);
//利用handler实现循环 自己给自己发消息
mHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
//接收到消息,会去更新一下角度,重绘一下
currentTime+=REFRESH_TIME;
//当角度百分百了,就不再发消息了
if(currentTime>totalShowTime){
//跳转页面
/*Toast.makeText(getContext()
, "跳转A页面", Toast.LENGTH_SHORT).show();*/
if(mOnSkipListener!=null){
mOnSkipListener.onSkip();
}
return;
}
invalidate();
//继续发延时消息给自己
this.sendEmptyMessageDelayed(0,REFRESH_TIME);
}
};
}
public static final int REFRESH_TIME = 100;
public float currentTime = 0;
//广告页面跳转的总时间
public float totalShowTime =3000;
//找到该控件调用该方法开始发消息
public void start(){
mHandler.sendEmptyMessageDelayed(0,REFRESH_TIME);
}
//停止发消息的方法
public void stop(){
mHandler.removeCallbacksAndMessages(null);
}
//给空间
@Override
public boolean onTouchEvent(MotionEvent event) {
int eventAction = event.getAction();
switch (eventAction) {
case MotionEvent.ACTION_DOWN:
//设置透明度
setAlpha(0.5f);
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
//让handler的还未处理的消息被移除
mHandler.removeCallbacksAndMessages(null);
setAlpha(1f);
//跳转页面
/*
Toast.makeText(getContext()
, "跳转A页面", Toast.LENGTH_SHORT).show();*/
//在哪个页面中用到了这个控件,就在哪个页面写具体的逻辑
if(mOnSkipListener!=null){
mOnSkipListener.onSkip();
}
break;
}
return true;
}
//1 定义一个接口
public interface OnSkipListener{
void onSkip();
}
private OnSkipListener mOnSkipListener;
//2 来一个Set方法,传递接口实例过来
public void setOnSkipListener(OnSkipListener listener){
mOnSkipListener = listener;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//绘制3个东西
//外部圆弧
canvas.save();
canvas.rotate(-90,getMeasuredWidth()/2,getMeasuredHeight()/2);
float angle = currentTime/totalShowTime*360;
canvas.drawArc(mRectF,0,angle,false,mArcPaint);
canvas.restore();
//中间的圆
canvas.drawCircle(getMeasuredWidth()/2,getMeasuredHeight()/2,mCircleDoubleRadius/2,mCirclePaint);
//内部的文字
Paint.FontMetrics fontMetrics = mTextPaint.getFontMetrics();
float ascent = fontMetrics.ascent;
float descent = fontMetrics.descent;
float top = fontMetrics.top;
float bottom = fontMetrics.bottom;
Log.e(getClass().getSimpleName()+" xmg", "onDraw: "+" top "+top
+" ascent "+ascent+" descent "+descent+" bottom "+bottom);
//文字居中的公式
float baseLine = getMeasuredHeight()/2 - (top+bottom)/2
canvas.drawText("跳过",getMeasuredWidth()/2-mMeasureTextWidth/2
,baseLine,mTextPaint);
}
