一、实现效果图
二、实现代码
1.自定义view
代码如下 | 复制代码 |
packagecom.czhappy.showintroduce.view; importandroid.content.Context; importandroid.graphics.Bitmap; importandroid.graphics.Canvas; importandroid.graphics.Color; importandroid.graphics.Paint; importandroid.graphics.Path; importandroid.util.AttributeSet; importandroid.view.View; importandroid.widget.RelativeLayout; /** * Description: 水波纹动画引导view * User: chenzheng * Date: 2017/1/14 0014 * Time: 18:01 */ publicclassRippleIntroViewextendsRelativeLayoutimplementsRunnable { privateintmMaxRadius =70; privateintmInterval =20; privateintcount =0; privateBitmap mCacheBitmap; privatePaint mRipplePaint; privatePaint mCirclePaint; privatePath mArcPath; publicRippleIntroView(Context context) { this(context,null); } publicRippleIntroView(Context context, AttributeSet attrs) { this(context, attrs,0); } publicRippleIntroView(Context context, AttributeSet attrs,intdefStyleAttr) { super(context, attrs, defStyleAttr); init(); } privatevoidinit() { mRipplePaint =newPaint(); mRipplePaint.setAntiAlias(true); mRipplePaint.setStyle(Paint.Style.STROKE); mRipplePaint.setColor(Color.WHITE); mRipplePaint.setStrokeWidth(2.f); mCirclePaint =newPaint(); mCirclePaint.setAntiAlias(true); mCirclePaint.setStyle(Paint.Style.FILL); mCirclePaint.setColor(Color.WHITE); mArcPath =newPath(); } /** * view大小变化时系统调用 * @param w * @param h * @param oldw * @param oldh */ @Override protectedvoidonSizeChanged(intw,inth,intoldw,intoldh) { super.onSizeChanged(w, h, oldw, oldh); if(mCacheBitmap !=null) { mCacheBitmap.recycle(); mCacheBitmap =null; } } @Override protectedvoidonDraw(Canvas canvas) { //获取加号图片view View mPlusChild = getChildAt(0); //获取提示图片view View mRefsChild = getChildAt(1); if(mPlusChild ==null|| mRefsChild ==null)return; //获取加号图片大小 finalintpw = mPlusChild.getWidth(); finalintph = mPlusChild.getHeight(); //获取提示图片大小 finalintfw = mRefsChild.getWidth(); finalintfh = mRefsChild.getHeight(); if(pw ==0|| ph ==0)return; //加号图片中心点坐标 finalfloatpx = mPlusChild.getX() + pw /2; finalfloatpy = mPlusChild.getY() + ph /2; //提示图片左上角坐标 finalfloatfx = mRefsChild.getX(); finalfloatfy = mRefsChild.getY(); finalintrw = pw /2; finalintrh = ph /2; if(mCacheBitmap ==null) { mCacheBitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888); Canvas cv =newCanvas(mCacheBitmap); super.onDraw(cv); //清空所有已经画过的path至原始状态 mArcPath.reset(); //起始轮廓点移至x,y坐标点,即加号图片正下方再往下20位置 mArcPath.moveTo(px, py + rh + mInterval); //设置二次贝塞尔,实现平滑曲线,前两个参数为操作点坐标,后两个参数为结束点坐标 mArcPath.quadTo(px, fy - mInterval, fx + fw *0.618f, fy - mInterval); //0~255,数值越小越透明 mRipplePaint.setAlpha(255); cv.drawPath(mArcPath, mRipplePaint); //绘制半径为6的实心圆点 cv.drawCircle(px, py + rh + mInterval,6, mCirclePaint); } //绘制背景图片 canvas.drawBitmap(mCacheBitmap,0,0, mCirclePaint); //保存画布当前的状态 intsave = canvas.save(); for(intstep = count; step <= mMaxRadius; step += mInterval) { //step越大越靠外就越透明 mRipplePaint.setAlpha(255* (mMaxRadius - step) / mMaxRadius); canvas.drawCircle(px, py, (float) (rw + step), mRipplePaint); } //恢复Canvas的状态 canvas.restoreToCount(save); //延迟80毫秒后开始运行 postDelayed(this,80); } @Override publicvoidrun() { //把run对象的引用从队列里拿出来,这样,他就不会执行了,但 run 没有销毁 removeCallbacks(this); count +=2; count %= mInterval; invalidate();//重绘 } /** * 销毁view时调用,收尾工作 */ @Override protectedvoidonDetachedFromWindow() { super.onDetachedFromWindow(); if(mCacheBitmap !=null) { mCacheBitmap.recycle(); mCacheBitmap =null; } } } |
2.MainActivity.Java
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代码如下 | 复制代码 |
packagecom.czhappy.showintroduce.activity; importandroid.os.Bundle; importandroid.support.v7.app.AppCompatActivity; importandroid.view.View; importandroid.view.ViewGroup; importcom.czhappy.showintroduce.R; publicclassMainActivityextendsAppCompatActivity { @Override protectedvoidonCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); View view = findViewById(R.id.layout_ripple); view.setOnClickListener(newView.OnClickListener() { @Override publicvoidonClick(View v) { ((ViewGroup) v.getParent()).removeView(v); } }); } } |
3.activity_main.xml
代码如下 | 复制代码 |
android:layout_width="match_parent" android:layout_height="match_parent"> android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!"/> android:id="@+id/layout_ripple" android:layout_width="match_parent" android:layout_height="match_parent" android:clickable="true" android:fitsSystemWindows="true" android:background="#AA000000"> android:id="@+id/iv_plus" android:layout_marginTop="36dp" android:src="@mipmap/ic_add" android:layout_alignParentRight="true" android:layout_marginRight="6dp" android:layout_width="wrap_content" android:layout_height="wrap_content"/> android:src="@mipmap/tips_subscribe" android:id="@+id/tv_title" android:layout_below="@id/iv_plus" android:layout_marginTop="50dp" android:layout_alignParentRight="true" android:layout_marginRight="40dp" android:layout_width="wrap_content" android:layout_height="wrap_content"/> |