我找到的唯一解决方案是获取原始TabLayout
的源代码并按需自定义。
事实上,您所需做的就是覆盖SlidingTabStrip
的void draw(Canvas canvas)
方法即可获得此自定义指向箭头。不幸的是,SlidingTabStrip
是TabLayout
内部的private
内部类。
TabLayoutWithArrow
类。我用以下方法替换了标准的void draw(Canvas canvas)
以绘制箭头: @Override
public void draw(Canvas canvas) {
super.draw(canvas);
// i used <dimen name="pointing_arrow_size">3dp</dimen>
int arrowSize = getResources().getDimensionPixelSize(R.dimen.pointing_arrow_size);
if (mIndicatorLeft >= 0 && mIndicatorRight > mIndicatorLeft) {
canvas.drawRect(mIndicatorLeft, getHeight() - mSelectedIndicatorHeight - arrowSize,
mIndicatorRight, getHeight() - arrowSize, mSelectedIndicatorPaint);
canvas.drawPath(getTrianglePath(arrowSize), mSelectedIndicatorPaint);
}
}
private Path getTrianglePath(int arrowSize) {
mSelectedIndicatorPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mSelectedIndicatorPaint.setAntiAlias(true);
int leftPointX = mIndicatorLeft + (mIndicatorRight - mIndicatorLeft) / 2 - arrowSize*2;
int rightPointX = leftPointX + arrowSize*2;
int bottomPointX = leftPointX + arrowSize;
int leftPointY = getHeight() - arrowSize;
int bottomPointY = getHeight();
Point left = new Point(leftPointX, leftPointY);
Point right = new Point(rightPointX, leftPointY);
Point bottom = new Point(bottomPointX, bottomPointY);
Path path = new Path();
path.setFillType(Path.FillType.EVEN_ODD);
path.setLastPoint(left.x, left.y);
path.lineTo(right.x, right.y);
path.lineTo(bottom.x, bottom.y);
path.lineTo(left.x, left.y);
path.close();
return path;
}
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:bottom="@dimen/pointing_arrow_size">
<shape android:shape="rectangle" >
<solid android:color="#FFFF00" />
</shape>
</item>
<item android:height="@dimen/pointing_arrow_size"
android:gravity="bottom">
<shape android:shape="rectangle" >
<solid android:color="#00000000" />
</shape>
</item>
</layer-list>
实际使用方法为:
<klogi.com.viewpagerwithdifferentmenu.CustomTabLayout.TabLayoutWithArrow
android:id="@+id/tabLayout"
android:background="@drawable/tab_layout_background"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
现在它不起作用了,tintmanager类已从支持库23.2.0中删除,我通过在for循环内检测点击位置并在运行时更改背景drawable来管理相同的功能。PS:请查看此问题和答案,我正在使用相同的库:https://github.com/astuetz/PagerSlidingTabStrip/issues/141
以下是代码,供需要使用 Konstantin Loginov 代码实现上升三角的人使用:
private Path getTrianglePath(int arrowSize) {
mSelectedIndicatorPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mSelectedIndicatorPaint.setAntiAlias(true);
mSelectedIndicatorPaint.setColor(Color.WHITE);
int leftPointX = mIndicatorLeft + (mIndicatorRight - mIndicatorLeft) / 2 - arrowSize * 1 / 2;
int mTopX = leftPointX + arrowSize;
int mTopY = getHeight() - arrowSize;
int rightPointX = leftPointX + arrowSize * 2;
int leftPointY = getHeight();
Point left = new Point(leftPointX, leftPointY);
Point right = new Point(rightPointX, leftPointY);
Point bottom = new Point(mTopX, mTopY);
Path path = new Path();
path.setFillType(Path.FillType.EVEN_ODD);
path.setLastPoint(left.x, left.y);
path.lineTo(right.x, right.y);
path.lineTo(bottom.x, bottom.y);
path.lineTo(left.x, left.y);
path.close();
return path;
}