我想在BottomNavigationVIEw之上使用floatingActionbutton,以及锚定在BottomAppbar上时的行为.
我想出了一个相当“Hacky”的技巧,只是将BottomNavigationVIEw置于BottomAppbar之上而不提供背景,从而使其透明.
这看起来似乎很有效,但我发现只有在触摸按钮的上半部分时才能点击制作按钮(所以顶部没有透明的BottomNavigationVIEw).
<androIDx.constraintlayout.Widget.ConstraintLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" xmlns:app="http://schemas.androID.com/apk/res-auto" androID:layout_wIDth="match_parent" androID:layout_height="match_parent"> <androIDx.coordinatorlayout.Widget.CoordinatorLayout androID:layout_wIDth="match_parent" androID:layout_height="120dp" androID:layout_gravity="bottom" app:layout_constraintBottom_toBottomOf="parent"> <com.Google.androID.material.floatingactionbutton.floatingActionbutton androID:ID="@+ID/fab" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:clickable="true" androID:focusable="true" app:layout_anchor="@ID/bar" /> <com.Google.androID.material.bottomappbar.BottomAppbar androID:ID="@+ID/bar" androID:layout_wIDth="match_parent" androID:layout_height="58dp" androID:layout_gravity="bottom" androID:backgroundTint="@color/colorPrimaryDark" /> <com.Google.androID.material.bottomnavigation.BottomNavigationVIEw androID:ID="@+ID/bottomNavigation" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:layout_gravity="bottom" app:itemIconTint="@androID:color/darker_gray" app:itemTextcolor="@androID:color/white" app:labelVisibilityMode="labeled" app:menu="@menu/navigation" /> </androIDx.coordinatorlayout.Widget.CoordinatorLayout></androIDx.constraintlayout.Widget.ConstraintLayout>有没有办法实现这个想法,我可以完全点击floatingActionbutton？
解决方法:
First Way
试试这个你可以创建一个CustomBottomNavigationVIEw
这是CustomBottomNavigationVIEw的好文章
How I draw custom shapes in BottomNavigationView
示例代码
import androID.content.Context;import androID.graphics.*;import androID.support.design.Widget.BottomNavigationVIEw;import androID.support.v4.content.ContextCompat;import androID.util.AttributeSet;public class CustomBottomNavigationVIEw extends BottomNavigationVIEw { private Path mPath; private Paint mPaint; /** the CURVE_CIRCLE_RADIUS represent the radius of the fab button */ private final int CURVE_CIRCLE_RADIUS = 128 / 2; // the coordinates of the first curve private Point mFirstCurveStartPoint = new Point(); private Point mFirstCurveEndPoint = new Point(); private Point mFirstCurveControlPoint1 = new Point(); private Point mFirstCurveControlPoint2 = new Point(); //the coordinates of the second curve @SuppressWarnings("FIEldCanBeLocal") private Point mSecondCurveStartPoint = new Point(); private Point mSecondCurveEndPoint = new Point(); private Point mSecondCurveControlPoint1 = new Point(); private Point mSecondCurveControlPoint2 = new Point(); private int mNavigationbarWIDth; private int mNavigationbarHeight; public CustomBottomNavigationVIEw(Context context) { super(context); init(); } public CustomBottomNavigationVIEw(Context context, AttributeSet attrs) { super(context, attrs); init(); } public CustomBottomNavigationVIEw(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private voID init() { mPath = new Path(); mPaint = new Paint(); mPaint.setStyle(Paint.Style.FILL_AND_stroke); mPaint.setcolor(ContextCompat.getcolor(getContext(),R.color.colorAccent)); setBackgroundcolor(color.transparent); } @OverrIDe protected voID onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); } @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 // Navigation bar bounds (wIDth & height) mNavigationbarWIDth = getWIDth(); mNavigationbarHeight = getHeight(); // the coordinates (x,y) of the start point before curve mFirstCurveStartPoint.set((mNavigationbarWIDth / 2) - (CURVE_CIRCLE_RADIUS * 2) - (CURVE_CIRCLE_RADIUS / 3), 0); // the coordinates (x,y) of the end point after curve mFirstCurveEndPoint.set(mNavigationbarWIDth / 2, CURVE_CIRCLE_RADIUS + (CURVE_CIRCLE_RADIUS / 4)); // same thing for the second curve mSecondCurveStartPoint = mFirstCurveEndPoint; mSecondCurveEndPoint.set((mNavigationbarWIDth / 2) + (CURVE_CIRCLE_RADIUS * 2) + (CURVE_CIRCLE_RADIUS / 3), 0); // the coordinates (x,y) of the 1st control point on a cubic curve mFirstCurveControlPoint1.set(mFirstCurveStartPoint.x + CURVE_CIRCLE_RADIUS + (CURVE_CIRCLE_RADIUS / 4), mFirstCurveStartPoint.y); // the coordinates (x,y) of the 2nd control point on a 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); 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(); } @OverrIDe protected voID onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawPath(mPath, mPaint); }}现在使用这样的
<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" xmlns:app="http://schemas.androID.com/apk/res-auto" androID:ID="@+ID/coordinatorlayout" androID:layout_wIDth="match_parent" androID:layout_height="match_parent" androID:orIEntation="vertical"> <androID.support.design.Widget.floatingActionbutton androID:ID="@+ID/fab" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:layout_alignParentBottom="true" androID:layout_centerInParent="true" androID:layout_marginBottom="30dp" androID:clickable="true" androID:focusable="true" /> <neel.com.demo.CustomBottomNavigationVIEw androID:ID="@+ID/customBottombar" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:layout_alignParentBottom="true" androID:background="@color/colorAccent" app:labelVisibilityMode="labeled" /></relativeLayout>Activity
import androID.support.v7.app.AppCompatActivity;import androID.os.Bundle;public class MainActivity extends AppCompatActivity { @OverrIDe protected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.activity_main); CustomBottomNavigationVIEw curvedBottomNavigationVIEw = findVIEwByID(R.ID.customBottombar); curvedBottomNavigationVIEw.inflateMenu(R.menu.bottom_menu); }}OUTPUT
Second Way
<androIDx.coordinatorlayout.Widget.CoordinatorLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" xmlns:app="http://schemas.androID.com/apk/res-auto" androID:layout_wIDth="match_parent" androID:layout_height="120dp" androID:layout_gravity="bottom"> <com.Google.androID.material.floatingactionbutton.floatingActionbutton androID:ID="@+ID/fab" androID:layout_wIDth="wrap_content" androID:layout_height="wrap_content" androID:clickable="true" androID:focusable="true" app:layout_anchor="@ID/bar" /> <com.Google.androID.material.bottomappbar.BottomAppbar androID:ID="@+ID/bar" androID:layout_wIDth="match_parent" androID:layout_height="58dp" androID:layout_gravity="bottom" androID:backgroundTint="@color/colorPrimaryDark"> <linearLayout androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:orIEntation="horizontal"> <TextVIEw androID:layout_wIDth="0dp" androID:layout_height="wrap_content" androID:layout_weight="1" androID:background="?androID:attr/selectableItemBackground" androID:drawabletop="@drawable/ic_favorite" androID:gravity="center" androID:orIEntation="vertical" androID:text="Personal" androID:textcolor="#FFFFFF"> </TextVIEw> <TextVIEw androID:layout_wIDth="0dp" androID:layout_height="wrap_content" androID:layout_weight="1" androID:background="?androID:attr/selectableItemBackground" androID:drawabletop="@drawable/ic_favorite" androID:gravity="center" androID:orIEntation="vertical" androID:text="Personal" androID:textcolor="#FFFFFF"> </TextVIEw> <TextVIEw androID:layout_wIDth="0dp" androID:layout_height="wrap_content" androID:layout_weight="1" androID:background="?androID:attr/selectableItemBackground" androID:drawabletop="@drawable/ic_favorite" androID:gravity="center" androID:orIEntation="vertical" androID:textcolor="#FFFFFF" androID:visibility="invisible"> </TextVIEw> <TextVIEw androID:layout_wIDth="0dp" androID:layout_height="wrap_content" androID:layout_weight="1" androID:background="?androID:attr/selectableItemBackground" androID:drawabletop="@drawable/ic_favorite" androID:gravity="center" androID:orIEntation="vertical" androID:text="Personal" androID:textcolor="#FFFFFF"> </TextVIEw> <TextVIEw androID:layout_wIDth="0dp" androID:layout_height="wrap_content" androID:layout_weight="1" androID:background="?androID:attr/selectableItemBackground" androID:drawabletop="@drawable/ic_favorite" androID:gravity="center" androID:orIEntation="vertical" androID:text="Personal" androID:textcolor="#FFFFFF"> </TextVIEw> </linearLayout> </com.Google.androID.material.bottomappbar.BottomAppbar></androIDx.coordinatorlayout.Widget.CoordinatorLayout>总结OUTPUT
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