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[英]How to combine BottomAppBar + FAB with BottomNavigationView
[英]How to align FAB at start/left in the BottomAppBar
我想像這樣在左側使用FloatingActionButton
在BottomAppBar
我們使用fabAlignmentMode
來對齊FloatingActionButton
。 模式是center和end 。 但我需要開始。
我找到了一篇文章How I draw custom shapes in bottom bar 。 這里使用貝塞爾曲線來創建曲線。
我試圖將FloatingActionButton
向左對齊。
public class CurvedBottomNavigationView extends BottomNavigationView {
//Declare variable
private Path mPath;
private Paint mPaint;
// The radius of fab button
public final int CURVE_CIRCLE_RADIUS = 90;
// The coordinates of the first curve
public Point mFirstCurveStartPoint = new Point();
public Point mFirstCurveEndPoint = new Point();
public Point mFirstCurveControlPoint1 = new Point();
public Point mFirstCurveControlPoint2 = new Point();
//The coordinates of the second curve
public Point mSecondCurveStartPoint = new Point();
public Point mSecondCurveEndPoint = new Point();
public Point mSecondCurveControlPoint1 = new Point();
public Point mSecondCurveControlPoint2 = new Point();
public int mNavigationBarWidth,mNavigationBarHeight;
public CurvedBottomNavigationView(Context context) {
super(context);
initView();
}
public CurvedBottomNavigationView(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
public CurvedBottomNavigationView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initView();
}
private void initView() {
mPath = new Path();
mPaint = new Paint();
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setColor(Color.WHITE);
setBackgroundColor(Color.TRANSPARENT);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//Get width and height of navigation bar
mNavigationBarWidth = getWidth();
mNavigationBarHeight = getHeight();
// the coordinates(x,y) of the start point before curve
mFirstCurveStartPoint.set((mNavigationBarWidth/9)
-(CURVE_CIRCLE_RADIUS*2)
-(CURVE_CIRCLE_RADIUS/3),0);
// the coordinates (x,y) of the end point after curve
mFirstCurveEndPoint.set((mNavigationBarWidth/9),CURVE_CIRCLE_RADIUS+(CURVE_CIRCLE_RADIUS/4));
//same for second curve
mSecondCurveStartPoint = mFirstCurveEndPoint;
mSecondCurveEndPoint.set((mNavigationBarWidth/9)+(CURVE_CIRCLE_RADIUS*2)+(CURVE_CIRCLE_RADIUS/3)
,0);
// The coordinates (x,y_ of the first control point on cubic curve
mFirstCurveControlPoint1.set(mFirstCurveStartPoint.x + (CURVE_CIRCLE_RADIUS)+(CURVE_CIRCLE_RADIUS/4),
mFirstCurveStartPoint.y);
// // The coordinates (x,y_ of the second control point on cubic curve
mFirstCurveControlPoint2.set(mFirstCurveEndPoint.x-(CURVE_CIRCLE_RADIUS*2)+CURVE_CIRCLE_RADIUS,
mFirstCurveEndPoint.y);
mSecondCurveControlPoint1.set(mSecondCurveStartPoint.x+(CURVE_CIRCLE_RADIUS*2)-CURVE_CIRCLE_RADIUS,mSecondCurveStartPoint.y);
mSecondCurveControlPoint2.set(mSecondCurveEndPoint.x-(CURVE_CIRCLE_RADIUS+(CURVE_CIRCLE_RADIUS/4)),mSecondCurveEndPoint.y);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
mPath.reset();
mPath.moveTo(0,0);
mPath.lineTo(mFirstCurveStartPoint.x,mFirstCurveStartPoint.y);
mPath.cubicTo(mFirstCurveControlPoint1.x,mFirstCurveControlPoint1.y,
mFirstCurveControlPoint2.x,mFirstCurveControlPoint2.y,
mFirstCurveEndPoint.x,mFirstCurveEndPoint.y);
mPath.cubicTo(mSecondCurveControlPoint1.x,mSecondCurveControlPoint1.y,
mSecondCurveControlPoint2.x,mSecondCurveControlPoint2.y,
mSecondCurveEndPoint.x,mSecondCurveEndPoint.y);
mPath.lineTo(mNavigationBarWidth,0);
mPath.lineTo(mNavigationBarWidth,mNavigationBarHeight);
mPath.lineTo(0,mNavigationBarHeight);
mPath.close();
canvas.drawPath(mPath,mPaint);
}
}
但是output不如我們使用BottomAppBar
對齊FloatingActionButton
時的效果。
有沒有其他方法可以添加fabAlignmentMode
來啟動?
在其他中將 FAB 對齊到 BottomAppbar 的開始。 這就是你所做的
<?xml version="1.0" encoding="utf-8"?> <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:layoutDirection="rtl" tools:context=".MainActivity"> <com.google.android.material.bottomappbar.BottomAppBar android:id="@+id/appBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" app:fabAlignmentMode="end" /> <com.google.android.material.floatingactionbutton.FloatingActionButton android:id="@+id/fabHome" android:layout_width="match_parent" android:layout_height="wrap_content" android:src="@drawable/ic_home" app:layout_anchor="@id/appBar" /> </androidx.coordinatorlayout.widget.CoordinatorLayout>
然后 select 在設計模式下的 AppBar 並將layoutDirection設置為 rtl
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