Android高亮引导控件的实现代码

最近项目需求是实现高亮功能引导页的效果，查了很多资料Android确实没有类似iOS的抠图的现成控件，就自己写一个，具体如下：

Demo

代码

public class HighLightLayout extends FrameLayout {
  private Paint mPaint;
  private Path mPath = new Path();
  private List<RectRegion> mRegions;

  public HighLightLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setColor(0xAA000000);

    setWillNotDraw(false);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    mPath.reset();
    mPath.addRect(0, 0, getWidth(), getHeight(), Path.Direction.CCW);
    for (RectRegion region : mRegions) {
      RectF rectF = region.rectF;
      if (region instanceof RoundRectRegion) {
        RoundRectRegion roundRectRegion = (RoundRectRegion) region;
        mPath.addRoundRect(rectF, roundRectRegion.rx, roundRectRegion.ry,               Path.Direction.CW);
      } else if (region instanceof CircleRegion) {
        CircleRegion circleRegion = (CircleRegion) region;
        float cX = (rectF.right + rectF.left) / 2;
        float cY = (rectF.bottom + rectF.top) / 2;
        mPath.addCircle(cX, cY, circleRegion.radius, Path.Direction.CW);
      } else if (region instanceof OvalRegion) {
        mPath.addOval(rectF, Path.Direction.CW);
      } else {
        mPath.addRect(rectF, Path.Direction.CW);
      }
    }
    canvas.drawPath(mPath, mPaint);
  }

  public void setRegion(@NonNull RectRegion region) {
    if (mRegions == null) {
      mRegions = new ArrayList<>();
    } else {
      mRegions.clear();
    }
    mRegions.add(region);
    invalidate();
  }

  public void setRegions(@NonNull List<RectRegion> regions) {
    mRegions = regions;
    invalidate();
  }

  @Override
  public void setBackgroundColor(int color) {
    mPaint.setColor(color);
  }
}

HighLightLayout继承自FrameLayout，重写了 onDraw 方法来实现高亮区域的绘制； setRegion 设置一个高亮区域， setRegions 设置多个高亮区域；重写 setBackgroundColor 来实现设置高亮背景色。

Region表示了一个高亮矩形区域，支持4种高亮类型，

RectRegion 矩形高亮区域

public class RectRegion implements Parcelable {
  public RectF rectF;
  //... Parcelable实现代码
}

RoundRectRegion 圆角矩形高亮区域

public class RoundRectRegion extends RectRegion {
  public float rx, ry;
  //... Parcelable实现代码
}

CircleRegion 圆形高亮区域

public class CircleRegion extends RectRegion {
  public float radius;
  //... Parcelable实现代码
}

OvalRegion 椭圆高亮区域

public class OvalRegion extends RectRegion {
  //... Parcelable实现代码
}

使用

创建一个GuideActivity，该Activity根布局是一个HighLightLayout，可以在HighLightLayout中添加任何控件

<wangyi.blog.app.view.HighLightLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/highLightLayout"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".GuideActivity">
</wangyi.blog.app.view.HighLightLayout>

启动GuideActivity 并传递需要高亮显示的区域

ArrayList<RectRegion> regions = new ArrayList<>();

    //矩形高亮
    RectF rectF1 = LocationUtils.getViewLocation(mButton1);
    RectRegion region1 = new RectRegion(rectF1);
    regions.add(region1);
    //圆角矩形高亮
    RectF rectF2 = LocationUtils.getViewLocation(mButton2);
    RoundRectRegion region2 = new RoundRectRegion(rectF2, 10, 10);
    regions.add(region2);
    //圆形高亮
    RectF rectF3 = LocationUtils.getViewLocation(mButton3);
    float radius = (rectF3.right - rectF3.left) / 2 + 20;
    CircleRegion region3 = new CircleRegion(rectF3, radius);
    regions.add(region3);
    //椭圆高亮
    RectF rectF4 = LocationUtils.getViewLocation(mButton4);
    LocationUtils.expandRectF(rectF4, 40);
    OvalRegion region4 = new OvalRegion(rectF4);
    regions.add(region4);

    Intent intent = new Intent(this, GuideActivity.class);
    intent.putExtra(GuideActivity.EXTRA_REGION_LIST, regions);
    startActivity(intent);

GuideActivity的onCreate中设置高亮区域

ArrayList<RectRegion> regions = getIntent().getParcelableArrayListExtra(EXTRA_REGION_LIST);
    HighLightLayout highLightLayout = findViewById(R.id.highLightLayout);
    highLightLayout.setRegions(regions);

Github

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