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系列教程：Android開發之從零開始系列
原始碼：AnliaLee/ExpandMenu，歡迎star
大家要是看到有錯誤的地方或者有啥好的建議，歡迎留言評論
前言：最近專案裡要實現一個 可展開收起的水平選單欄控制元件，剛接到需求時想著用自定義View自己來繪製，發現要實現 圓角、陰影、選單滑動等效果非常複雜且耗時間。好在這些效果 Android原生程式碼中都已經有非常成熟的解決方案，我們只需要去繼承它們進行 二次開發就行。本期將教大家如何 繼承ViewGroup（RelativeLayout）實現自定義選單欄
本篇只著重於思路和實現步驟，裡面用到的一些知識原理不會非常細地拿來講，如果有不清楚的api或方法可以在網上搜下相應的資料，肯定有大神講得非常清楚的，我這就不獻醜了。本著認真負責的精神我會把相關知識的博文連結也貼出來（其實就是懶不想寫那麼多哈哈），大家可以自行傳送。為了照顧第一次閱讀系列部落格的小夥伴，本篇會出現一些在之前系列部落格就講過的內容，看過的童鞋自行跳過該段即可
國際慣例，先上效果圖
為選單欄設定背景
自定義ViewGroup和自定義View的繪製過程有所不同，View可以直接在自己的onDraw方法中繪製所需要的效果，而ViewGroup會先測量子View的大小位置（onLayout），然後再進行繪製，如果子View或background為空，則不會呼叫draw方法繪製。當然我們可以呼叫setWillNotDraw(false)讓ViewGroup可以在子View或background為空的情況下進行繪製，但我們會為ViewGroup設定一個預設背景，所以可以省去這句程式碼
設定背景很簡單，因為要實現圓角、描邊等效果，所以我們選擇使用GradientDrawable來定製背景，然後呼叫setBackground方法設定背景。建立HorizontalExpandMenu，繼承自RelativeLayout，同時自定義Attrs屬性
public class HorizontalExpandMenu extends RelativeLayout {
private Context mContext;
private AttributeSet mAttrs;
private int defaultWidth;//預設寬度
private int defaultHeight;//預設長度
private int viewWidth;
private int viewHeight;
private int menuBackColor;//選單欄背景色
private float menuStrokeSize;//選單欄邊框線的size
private int menuStrokeColor;//選單欄邊框線的顏色
private float menuCornerRadius;//選單欄圓角半徑
public HorizontalExpandMenu(Context context) {
super(context);
this.mContext = context;
init();
}
public HorizontalExpandMenu(Context context, AttributeSet attrs) {
super(context, attrs);
this.mContext = context;
this.mAttrs = attrs;
init();
}
private void init(){
TypedArray typedArray = mContext.obtainStyledAttributes(mAttrs, R.styleable.HorizontalExpandMenu);
defaultWidth = DpOrPxUtils.dip2px(mContext,200);
defaultHeight = DpOrPxUtils.dip2px(mContext,40);
menuBackColor = typedArray.getColor(R.styleable.HorizontalExpandMenu_back_color,Color.WHITE);
menuStrokeSize = typedArray.getDimension(R.styleable.HorizontalExpandMenu_stroke_size,1);
menuStrokeColor = typedArray.getColor(R.styleable.HorizontalExpandMenu_stroke_color,Color.GRAY);
menuCornerRadius = typedArray.getDimension(R.styleable.HorizontalExpandMenu_corner_radius,DpOrPxUtils.dip2px(mContext,20));
typedArray.recycle();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int height = measureSize(defaultHeight, heightMeasureSpec);
int width = measureSize(defaultWidth, widthMeasureSpec);
viewHeight = height;
viewWidth = width;
setMeasuredDimension(viewWidth,viewHeight);
//佈局程式碼中如果沒有設定background屬性則在此處新增一個背景
if(getBackground()==null){
setMenuBackground();
}
}
private int measureSize(int defaultSize, int measureSpec) {
int result = defaultSize;
int specMode = View.MeasureSpec.getMode(measureSpec);
int specSize = View.MeasureSpec.getSize(measureSpec);
if (specMode == View.MeasureSpec.EXACTLY) {
result = specSize;
} else if (specMode == View.MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}
return result;
}
/**
* 設定選單背景，如果要顯示陰影，需在onLayout之前呼叫
*/
private void setMenuBackground(){
GradientDrawable gd = new GradientDrawable();
gd.setColor(menuBackColor);
gd.setStroke((int)menuStrokeSize, menuStrokeColor);
gd.setCornerRadius(menuCornerRadius);
setBackground(gd);
}
}
複製程式碼attrs屬性
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!--注意這裡的name要和自定義View的名稱一致，不然在xml佈局中無法引用-->
<declare-styleable name="HorizontalExpandMenu">
<attr name="back_color" format="color"></attr>
<attr name="stroke_size" format="dimension"></attr>
<attr name="stroke_color" format="color"></attr>
<attr name="corner_radius" format="dimension"></attr>
</declare-styleable>
</resources>
複製程式碼在佈局檔案中使用
<com.anlia.expandmenu.widget.HorizontalExpandMenu
android:id="@+id/expandMenu1"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_alignParentBottom="true"
android:layout_marginBottom="20dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp">
</com.anlia.expandmenu.widget.HorizontalExpandMenu>
複製程式碼效果如圖
繪製選單欄按鈕
我們要繪製選單欄兩邊的按鈕，首先是要為按鈕圈地（測量位置和大小）。設定按鈕區域為正方形，位於左側或右側（根據開發者設定而定），邊長和選單欄ViewGroup的高相等。按鈕中的加號可以使用Path進行繪製（當然也可以用向量圖或點陣圖），程式碼如下
public class HorizontalExpandMenu extends RelativeLayout {
//省略部分程式碼...
private float buttonIconDegrees;//按鈕icon符號豎線的旋轉角度
private float buttonIconSize;//按鈕icon符號的大小
private float buttonIconStrokeWidth;//按鈕icon符號的粗細
private int buttonIconColor;//按鈕icon顏色
private int buttonStyle;//按鈕型別
private int buttonRadius;//按鈕矩形區域內圓半徑
private float buttonTop;//按鈕矩形區域top值
private float buttonBottom;//按鈕矩形區域bottom值
private Point rightButtonCenter;//右按鈕中點
private float rightButtonLeft;//右按鈕矩形區域left值
private float rightButtonRight;//右按鈕矩形區域right值
private Point leftButtonCenter;//左按鈕中點
private float leftButtonLeft;//左按鈕矩形區域left值
private float leftButtonRight;//左按鈕矩形區域right值
/**
* 根按鈕所在位置，預設為右邊
*/
public class ButtonStyle {
public static final int Right = 0;
public static final int Left = 1;
}
private void init(){
//省略部分程式碼...
buttonStyle = typedArray.getInteger(R.styleable.HorizontalExpandMenu_button_style,ButtonStyle.Right);
buttonIconDegrees = 0;
buttonIconSize = typedArray.getDimension(R.styleable.HorizontalExpandMenu_button_icon_size,DpOrPxUtils.dip2px(mContext,8));
buttonIconStrokeWidth = typedArray.getDimension(R.styleable.HorizontalExpandMenu_button_icon_stroke_width,8);
buttonIconColor = typedArray.getColor(R.styleable.HorizontalExpandMenu_button_icon_color,Color.GRAY);
buttonIconPaint = new Paint();
buttonIconPaint.setColor(buttonIconColor);
buttonIconPaint.setStyle(Paint.Style.STROKE);
buttonIconPaint.setStrokeWidth(buttonIconStrokeWidth);
buttonIconPaint.setAntiAlias(true);
path = new Path();
leftButtonCenter = new Point();
rightButtonCenter = new Point();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int height = measureSize(defaultHeight, heightMeasureSpec);
int width = measureSize(defaultWidth, widthMeasureSpec);
viewHeight = height;
viewWidth = width;
setMeasuredDimension(viewWidth,viewHeight);
buttonRadius = viewHeight/2;
layoutRootButton();
//佈局程式碼中如果沒有設定background屬性則在此處新增一個背景
if(getBackground()==null){
setMenuBackground();
}
}
@Override
protected void onDraw(Canvas canvas) {
layoutRootButton();
if(buttonStyle == ButtonStyle.Right){
drawRightIcon(canvas);
}else {
drawLeftIcon(canvas);
}
super.onDraw(canvas);//注意父方法在最後呼叫，以免icon被遮蓋
}
/**
* 測量按鈕中點和矩形位置
*/
private void layoutRootButton(){
buttonTop = 0;
buttonBottom = viewHeight;
rightButtonCenter.x = viewWidth- buttonRadius;
rightButtonCenter.y = viewHeight/2;
rightButtonLeft = rightButtonCenter.x- buttonRadius;
rightButtonRight = rightButtonCenter.x+ buttonRadius;
leftButtonCenter.x = buttonRadius;
leftButtonCenter.y = viewHeight/2;
leftButtonLeft = leftButtonCenter.x- buttonRadius;
leftButtonRight = leftButtonCenter.x+ buttonRadius;
}
/**
* 繪製左邊的按鈕
* @param canvas
*/
private void drawLeftIcon(Canvas canvas){
path.reset();
path.moveTo(leftButtonCenter.x- buttonIconSize, leftButtonCenter.y);
path.lineTo(leftButtonCenter.x+ buttonIconSize, leftButtonCenter.y);
canvas.drawPath(path, buttonIconPaint);//劃橫線
canvas.save();
canvas.rotate(-buttonIconDegrees, leftButtonCenter.x, leftButtonCenter.y);//旋轉畫布，讓豎線可以隨角度旋轉
path.reset();
path.moveTo(leftButtonCenter.x, leftButtonCenter.y- buttonIconSize);
path.lineTo(leftButtonCenter.x, leftButtonCenter.y+ buttonIconSize);
canvas.drawPath(path, buttonIconPaint);//畫豎線
canvas.restore();
}
/**
* 繪製右邊的按鈕
* @param canvas
*/
private void drawRightIcon(Canvas canvas){
path.reset();
path.moveTo(rightButtonCenter.x- buttonIconSize, rightButtonCenter.y);
path.lineTo(rightButtonCenter.x+ buttonIconSize, rightButtonCenter.y);
canvas.drawPath(path, buttonIconPaint);//劃橫線
canvas.save();
canvas.rotate(buttonIconDegrees, rightButtonCenter.x, rightButtonCenter.y);//旋轉畫布，讓豎線可以隨角度旋轉
path.reset();
path.moveTo(rightButtonCenter.x, rightButtonCenter.y- buttonIconSize);
path.lineTo(rightButtonCenter.x, rightButtonCenter.y+ buttonIconSize);
canvas.drawPath(path, buttonIconPaint);//畫豎線
canvas.restore();
}
}
複製程式碼新增attrs屬性
<declare-styleable name="HorizontalExpandMenu">
//省略部分程式碼...
<attr name="button_style">
<enum name="right" value="0"/>
<enum name="left" value="1"/>
</attr>
<attr name="button_icon_size" format="dimension"></attr>
<attr name="button_icon_stroke_width" format="dimension"></attr>
<attr name="button_icon_color" format="color"></attr>
</declare-styleable>
複製程式碼佈局檔案
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.anlia.expandmenu.widget.HorizontalExpandMenu
android:id="@+id/expandMenu1"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="20dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp">
</com.anlia.expandmenu.widget.HorizontalExpandMenu>
<com.anlia.expandmenu.widget.HorizontalExpandMenu
android:id="@+id/expandMenu2"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="10dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
app:button_style="left">
</com.anlia.expandmenu.widget.HorizontalExpandMenu>
</LinearLayout>
</RelativeLayout>
複製程式碼效果如圖
設定按鈕動畫與點選事件
之前我們定義了buttonIconDegrees屬性，下面我們通過Animation的插值器增減buttonIconDegrees的數值讓按鈕符號可以進行變換，同時監聽Touch為按鈕設定點選事件
public class HorizontalExpandMenu extends RelativeLayout {
//省略部分程式碼...
private boolean isExpand;//選單是否展開，預設為展開
private float downX = -1;
private float downY = -1;
private int expandAnimTime;//展開收起選單的動畫時間
private void init(){
//省略部分程式碼...
buttonIconDegrees = 90;//選單初始狀態為展開，所以旋轉角度為90，按鈕符號為 - 號
expandAnimTime = typedArray.getInteger(R.styleable.HorizontalExpandMenu_expand_time,400);
isExpand = true;
anim = new ExpandMenuAnim();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
float x = event.getX();
float y = event.getY();
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
downX = event.getX();
downY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
switch (buttonStyle){
case ButtonStyle.Right:
if(x==downX&&y==downY&&y>=buttonTop&&y<=buttonBottom&&x>=rightButtonLeft&&x<=rightButtonRight){
expandMenu(expandAnimTime);
}
break;
case ButtonStyle.Left:
if(x==downX&&y==downY&&y>=buttonTop&&y<=buttonBottom&&x>=leftButtonLeft&&x<=leftButtonRight){
expandMenu(expandAnimTime);
}
break;
}
break;
}
return true;
}
private class ExpandMenuAnim extends Animation {
public ExpandMenuAnim() {}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
if(isExpand){//展開選單
buttonIconDegrees = 90 * interpolatedTime;
}else {//收起選單
buttonIconDegrees = 90 - 90 * interpolatedTime;
}
postInvalidate();
}
}
/**
* 展開收起選單
* @param time 動畫時間
*/
private void expandMenu(int time){
anim.setDuration(time);
isExpand = isExpand ?false:true;
this.startAnimation(anim);
}
}
複製程式碼效果如圖
設定選單展開收起動畫
ViewGroup的大小和位置需要用到layout()方法進行設定，和按鈕動畫一樣，我們使用動畫插值器動態改變選單的長度
public class HorizontalExpandMenu extends RelativeLayout {
//省略部分程式碼...
private float backPathWidth;//繪製子View區域寬度
private float maxBackPathWidth;//繪製子View區域最大寬度
private int menuLeft;//menu區域left值
private int menuRight;//menu區域right值
private boolean isFirstLayout;//是否第一次測量位置，主要用於初始化menuLeft和menuRight的值
private void init(){
//省略部分程式碼...
isFirstLayout = true;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//省略部分程式碼...
maxBackPathWidth = viewWidth- buttonRadius *2;
backPathWidth = maxBackPathWidth;
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
//如果子View數量為0時，onLayout後getLeft()和getRight()才能獲取相應數值，menuLeft和menuRight儲存menu初始的left和right值
if(isFirstLayout){
menuLeft = getLeft();
menuRight = getRight();
isFirstLayout = false;
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
viewWidth = w;//當menu的寬度改變時，重新給viewWidth賦值
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//省略部分程式碼...
switch (event.getAction()){
case MotionEvent.ACTION_UP:
if(backPathWidth==maxBackPathWidth || backPathWidth==0){//動畫結束時按鈕才生效
switch (buttonStyle){
case ButtonStyle.Right:
if(x==downX&&y==downY&&y>=buttonTop&&y<=buttonBottom&&x>=rightButtonLeft&&x<=rightButtonRight){
expandMenu(expandAnimTime);
}
break;
case ButtonStyle.Left:
if(x==downX&&y==downY&&y>=buttonTop&&y<=buttonBottom&&x>=leftButtonLeft&&x<=leftButtonRight){
expandMenu(expandAnimTime);
}
break;
}
}
break;
}
}
private class ExpandMenuAnim extends Animation {
public ExpandMenuAnim() {}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
float left = menuRight - buttonRadius *2;//按鈕在右邊，選單收起時按鈕區域left值
float right = menuLeft + buttonRadius *2;//按鈕在左邊，選單收起時按鈕區域right值
if(isExpand){//開啟選單
backPathWidth = maxBackPathWidth * interpolatedTime;
buttonIconDegrees = 90 * interpolatedTime;
}else {//關閉選單
backPathWidth = maxBackPathWidth - maxBackPathWidth * interpolatedTime;
buttonIconDegrees = 90 - 90 * interpolatedTime;
}
if(buttonStyle == ButtonStyle.Right){
layout((int)(left-backPathWidth),getTop(), menuRight,getBottom());//會呼叫onLayout重新測量子View位置
}else {
layout(menuLeft,getTop(),(int)(right+backPathWidth),getBottom());
}
postInvalidate();
}
}
}
複製程式碼效果如圖
測量選單欄子View的位置
為了選單欄的顯示效果，我們限制其直接子View的數量為一個。在子View數量不為0的情況下，我們需要動態顯示和隱藏子View，且在onLayout()方法中測量子View的位置，修改HorizontalExpandMenu
public class HorizontalExpandMenu extends RelativeLayout {
//省略部分程式碼...
private boolean isAnimEnd;//動畫是否結束
private View childView;
private void init(){
//省略部分程式碼...
isAnimEnd = false;
anim.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {}
@Override
public void onAnimationEnd(Animation animation) {
isAnimEnd = true;
}
@Override
public void onAnimationRepeat(Animation animation) {}
});
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
//如果子View數量為0時，onLayout後getLeft()和getRight()才能獲取相應數值，menuLeft和menuRight儲存menu初始的left和right值
if(isFirstLayout){
menuLeft = getLeft();
menuRight = getRight();
isFirstLayout = false;
}
if(getChildCount()>0){
childView = getChildAt(0);
if(isExpand){
if(buttonStyle == Right){
childView.layout(leftButtonCenter.x,(int) buttonTop,(int) rightButtonLeft,(int) buttonBottom);
}else {
childView.layout((int)(leftButtonRight),(int) buttonTop,rightButtonCenter.x,(int) buttonBottom);
}
//限制子View在選單內，LayoutParam型別和當前ViewGroup一致
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(viewWidth,viewHeight);
layoutParams.setMargins(0,0,buttonRadius *3,0);
childView.setLayoutParams(layoutParams);
}else {
childView.setVisibility(GONE);
}
}
if(getChildCount()>1){//限制直接子View的數量
throw new IllegalStateException("HorizontalExpandMenu can host only one direct child");
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
viewWidth = w;//當menu的寬度改變時，重新給viewWidth賦值
if(isAnimEnd){//防止出現動畫結束後選單欄位置大小測量錯誤的bug
if(buttonStyle == Right){
if(!isExpand){
layout((int)(menuRight - buttonRadius *2-backPathWidth),getTop(), menuRight,getBottom());
}
}else {
if(!isExpand){
layout(menuLeft,getTop(),(int)(menuLeft + buttonRadius *2+backPathWidth),getBottom());
}
}
}
}
private class ExpandMenuAnim extends Animation {
public ExpandMenuAnim() {}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
float left = menuRight - buttonRadius *2;//按鈕在右邊，選單收起時按鈕區域left值
float right = menuLeft + buttonRadius *2;//按鈕在左邊，選單收起時按鈕區域right值
if(childView!=null) {
childView.setVisibility(GONE);
}
if(isExpand){//開啟選單
backPathWidth = maxBackPathWidth * interpolatedTime;
buttonIconDegrees = 90 * interpolatedTime;
if(backPathWidth==maxBackPathWidth){
if(childView!=null) {
childView.setVisibility(VISIBLE);
}
}
}else {//關閉選單
backPathWidth = maxBackPathWidth - maxBackPathWidth * interpolatedTime;
buttonIconDegrees = 90 - 90 * interpolatedTime;
}
if(buttonStyle == Right){
layout((int)(left-backPathWidth),getTop(), menuRight,getBottom());//會呼叫onLayout重新測量子View位置
}else {
layout(menuLeft,getTop(),(int)(right+backPathWidth),getBottom());
}
postInvalidate();
}
}
/**
* 展開收起選單
* @param time 動畫時間
*/
private void expandMenu(int time){
anim.setDuration(time);
isExpand = isExpand ?false:true;
this.startAnimation(anim);
isAnimEnd = false;
}
}
複製程式碼佈局程式碼
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.anlia.expandmenu.widget.HorizontalExpandMenu
android:id="@+id/expandMenu1"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="20dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:gravity="center_vertical"
android:clickable="true">
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="item1"/>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="item2"/>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="item3"/>
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="item4"/>
</LinearLayout>
</com.anlia.expandmenu.widget.HorizontalExpandMenu>
<com.anlia.expandmenu.widget.HorizontalExpandMenu
android:id="@+id/expandMenu2"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="15dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
app:button_style="left">
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:scrollbars="none">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal"
android:gravity="center_vertical"
android:clickable="true">
<TextView
android:layout_width="100dp"
android:layout_height="match_parent"
android:gravity="center"
android:background="@color/blue"
android:text="item1"/>
<TextView
android:layout_width="50dp"
android:layout_height="match_parent"
android:gravity="center"
android:background="@color/yellow"
android:text="item2"/>
<TextView
android:layout_width="100dp"
android:layout_height="match_parent"
android:gravity="center"
android:background="@color/green"
android:text="item3"/>
<TextView
android:layout_width="150dp"
android:layout_height="match_parent"
android:gravity="center"
android:background="@color/red"
android:text="item4"/>
</LinearLayout>
</HorizontalScrollView>
</com.anlia.expandmenu.widget.HorizontalExpandMenu>
</LinearLayout>
複製程式碼效果如圖
至此本篇教程到此結束，如果大家看了感覺還不錯麻煩點個贊，你們的支援是我最大的動力~