如何将BottomAppBar + FAB 与BottomNavigationView 结合使用 [英] How to combine BottomAppBar + FAB with BottomNavigationView
本文介绍了如何将BottomAppBar + FAB 与BottomNavigationView 结合使用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想使用 FloatingActionButton，以及它在锚定在 BottomAppBar、BottomNavigationView 顶部时的行为.
我想出了一个相当hacky"的技巧，将 BottomNavigationView 放在 BottomAppBar 的顶部，而不提供背景，从而使其透明.
乍一看似乎效果很好，但我发现 fab 按钮只能在触摸按钮的上半部分时单击(因此顶部没有透明的 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.CoordinatorLayoutandroid:layout_width="match_parent"android:layout_height="120dp"机器人:layout_gravity="底部"app:layout_constraintBottom_toBottomOf="parent"><com.google.android.material.floatingactionbutton.FloatingActionButtonandroid:id="@+id/fab"android:layout_width="wrap_content"android:layout_height="wrap_content"安卓:可点击=真"机器人:焦点=真"app:layout_anchor="@id/bar"/><com.google.android.material.bottomappbar.BottomAppBarandroid:id="@+id/bar"android:layout_width="match_parent"android:layout_height="58dp"机器人:layout_gravity="底部"android:backgroundTint="@color/colorPrimaryDark"/><com.google.android.material.bottomnavigation.BottomNavigationViewandroid:id="@+id/bottomNavigation"android:layout_width="match_parent"android:layout_height="wrap_content"机器人:layout_gravity="底部"app:itemIconTint="@android:color/darker_gray"app:itemTextColor="@android:color/white"应用程序:labelVisibilityMode="标记"app:menu="@menu/navigation"/></androidx.coordinatorlayout.widget.CoordinatorLayout></androidx.constraintlayout.widget.ConstraintLayout>有没有什么方法可以实现这个想法，我可以完全点击FloatingActionButton?
解决方案
第一种方式
试试这个你可以创建一个 CustomBottomNavigationView
这是CustomBottomNavigationView
第二种方式
I want to use the FloatingActionButton, along with its behaviour when anchored on a BottomAppBar, on top of a BottomNavigationView.
I came up with a rather "hacky" trick to just place the BottomNavigationView on top of the BottomAppBar without providing a background thus making it transparent.
This seemed to work well at first sight but I found out that the fab button can only be clicked when touching the upper half of the button (So where there is no transparent BottomNavigationView on top).
<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>
Is there any way of implementing this idea in which I can fully click on the FloatingActionButton?
解决方案
First Way
Try this You can Create a CustomBottomNavigationView
Here is the good article for CustomBottomNavigationView
How I draw custom shapes in BottomNavigationView
SAMPLE CODE
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);
}
}
Now use like this
<?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
style="?android:attr/borderlessButtonStyle"
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
style="?android:attr/borderlessButtonStyle"
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
style="?android:attr/borderlessButtonStyle"
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
style="?android:attr/borderlessButtonStyle"
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
style="?android:attr/borderlessButtonStyle"
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>
OUTPUT
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