在Android开发中，我们页面的切换都是使用tabLayout 和viewPager 配合使用，那么我想自定义底部导航栏实现与tabLayout 相似的功能
这次直接写完美，可以让用户自己定义想要的效果
1.在valuse 下创建 .xml 文件
2.创建自定义BottomNavigation 的类
3.使用 及效果
在valuse 下创建 .xml 文件
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="BottomNavigationView">
<!-- private int mMarginLeft;
private int mMarginTop;
private int mMarginBottom;
private int mMarginRight;-->
<attr name="bottomNavigationLeftMargin" format="dimension|reference"/>
<attr name="bottomNavigationRightMargin" format="dimension|reference"/>
<attr name="bottomNavigationTopMargin" format="dimension|reference"/>
<attr name="bottomNavigationBottomMargin" format="dimension|reference"/>
<attr name="bottomNavigationDrawableMargin" format="dimension|reference"/>
<attr name="bottomNavigationDrawableWidth" format="dimension|reference"/>
<attr name="bottomNavigationDrawableHeight" format="dimension|reference"/>
<attr name="bottomNavigationDeliverLine" format="boolean"/>
<attr name="bottomNavigationDeliverLineWidth" format="dimension|reference"/>
<attr name="bottomNavigationDeliverLineColor" format="color|reference"/>
<attr name="bottomNavigationTextColor" format="color|reference"/>
<attr name="bottomNavigationTextSize" format="dimension|reference"/>
</declare-styleable>
</resources>
创建自定义BottomNavigation 的类
public class BottomNavigationView extends ConstraintLayout {
//水平的dp
private static final int HORIZONTAL_MARGIN_DP = 32;
//竖直的dp
private static final int VERTICAL_MARGIN_DP = 12;
//list集合
private List<Integer> mList = new ArrayList<>();
//集合
private List<String> mTitle = new ArrayList<>();
private int mMarginLeft;
private int mMarginTop;
private int mMarginBottom;
private int mMarginRight;
private int mTextSize;
private int mDrawableMargin;
private int mDrawableIconWidth;
private int mDrawableIconHeight;
private int mDeliverLineWidth;//线的宽和高
private int mDeliverLineColor;//线的颜色
private ColorStateList mTextColorStateList;
//适配器
private NavigationAdapter simpleNavigationAdapter;
//监听
private OnTabSelectedListener mTabSelectedListener;
private boolean mHasDeliverLine; // 是否显示分割线
private int mCurrentPosition = 0;
private Paint mLinePaint;
public BottomNavigationView(Context context) {
super(context);
}
public BottomNavigationView(Context context, AttributeSet attrs) {
super(context, attrs);
initValue(attrs);
}
public BottomNavigationView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initValue(attrs);
}
private void initValue(AttributeSet attrs) {
TypedArray array = getContext().obtainStyledAttributes(attrs, R.styleable.BottomNavigationView);
mMarginLeft = array.getDimensionPixelSize(R.styleable.BottomNavigationView_bottomNavigationLeftMargin,dip2px(HORIZONTAL_MARGIN_DP));
mMarginRight = array.getDimensionPixelSize(R.styleable.BottomNavigationView_bottomNavigationRightMargin,dip2px(HORIZONTAL_MARGIN_DP));
mMarginTop = array.getDimensionPixelSize(R.styleable.BottomNavigationView_bottomNavigationTopMargin,dip2px(VERTICAL_MARGIN_DP));
mMarginBottom = array.getDimensionPixelSize(R.styleable.BottomNavigationView_bottomNavigationBottomMargin, dip2px(VERTICAL_MARGIN_DP));
mDrawableIconWidth = array.getDimensionPixelSize(R.styleable.BottomNavigationView_bottomNavigationDrawableWidth, 0);
mDrawableIconHeight = array.getDimensionPixelSize(R.styleable.BottomNavigationView_bottomNavigationDrawableHeight, 0);
mDrawableMargin = array.getDimensionPixelSize(R.styleable.BottomNavigationView_bottomNavigationDrawableMargin,0);
mTextSize = array.getDimensionPixelSize(R.styleable.BottomNavigationView_bottomNavigationTextSize,0);
mTextColorStateList = array.getColorStateList(R.styleable.BottomNavigationView_bottomNavigationTextColor);
mHasDeliverLine = array.getBoolean(R.styleable.BottomNavigationView_bottomNavigationDeliverLine, true);
mDeliverLineWidth = array.getDimensionPixelSize(R.styleable.BottomNavigationView_bottomNavigationDeliverLineWidth, dip2px( 1));
mDeliverLineColor = array.getColor(R.styleable.BottomNavigationView_bottomNavigationDeliverLineColor, Color.GRAY);
array.recycle();
mLinePaint = new Paint();
mLinePaint.setAntiAlias(true);
mLinePaint.setColor(mDeliverLineColor);
mLinePaint.setStrokeWidth(mDeliverLineWidth);
setWillNotDraw(!mHasDeliverLine);
}
public void setTabSelectedListener(OnTabSelectedListener tabSelectedListener) {
this.mTabSelectedListener = tabSelectedListener;
//如果适配器不等于空
if (simpleNavigationAdapter != null) {
//获取每个View
View tabView = simpleNavigationAdapter.getHolderByPosition(mCurrentPosition).mItemView;
//传入View 和 控件的tag (presenter)
mTabSelectedListener.onTabSelect(tabView, (Integer) tabView.getTag());
}
}
public BottomNavigationView addItem(int drawableId, String title){
mList.add(drawableId);
mTitle.add(title);
return this;
}
public void apply(){
//把drawableId 和 title 应用到布局中
if (mList.size()>0){
ArrayList<TabBean> tabBeans = new ArrayList<>();
for (int i = 0; i < mList.size(); i++) {
tabBeans.add(new TabBean(mList.get(i),mTitle.get(i)));
}
apply(new SimpleNavigationAdapter(tabBeans));
}
}
public void apply(NavigationAdapter<? extends TabHolder> adapter){
simpleNavigationAdapter=adapter;
initView();
}
private void initView() {
removeAllViews();
int minTabWidth = Integer.MAX_VALUE; // 所有tab 中最小的那一个的宽度
int maxTabHeight = 0; // 所有tab 中最高哪一个的高度
int maxTabHeightIndex = 0; // 最高tab 的index
//循环获取适配器中的item
for (int i = 0; i < simpleNavigationAdapter.getCount(); i++) {
TabHolder holder = simpleNavigationAdapter.createHolder(this, i);
addView(holder.mItemView);
simpleNavigationAdapter.bindData(holder,i);
//计算每一个tab 的宽和高
holder.mItemView.measure(MeasureSpec.makeMeasureSpec(0,MeasureSpec.UNSPECIFIED),MeasureSpec.makeMeasureSpec(0,MeasureSpec.UNSPECIFIED));
if (holder.mItemView.getMeasuredWidth()<minTabWidth){
minTabWidth=holder.mItemView.getMeasuredWidth();
}
if (holder.mItemView.getMeasuredHeight()>maxTabHeight){
maxTabHeight=holder.mItemView.getMeasuredHeight();
maxTabHeightIndex=i;
}
}
//添加约束条件
ConstraintSet constraintSet = new ConstraintSet();
constraintSet.clone(this);
int previousId = 0; // 用于记录上一个 id
View view;
int ids [] = new int[simpleNavigationAdapter.getCount()];
// 在使用链的时候，如果是水平的链，那么就只需要把链上的所有控件的垂直方向上的约束添加上即可
//先把最高的那一个tab 固定好
view = simpleNavigationAdapter.getHolderByPosition(maxTabHeightIndex).mItemView;
constraintSet.connect(view.getId(),ConstraintSet.TOP,ConstraintSet.PARENT_ID,ConstraintSet.TOP);
constraintSet.connect(view.getId(),ConstraintSet.BOTTOM,ConstraintSet.PARENT_ID,ConstraintSet.BOTTOM);
ids[maxTabHeightIndex] =view.getId();
previousId=view.getId();
//最高的左边
if (maxTabHeightIndex>0){
for (int i=maxTabHeightIndex-1;i>=0;i--){
view = simpleNavigationAdapter.getHolderByPosition(i).mItemView;
constraintSet.connect(view.getId(), ConstraintSet.BOTTOM, previousId, ConstraintSet.BOTTOM);
previousId=view.getId();
ids[i]=view.getId();
}
}
if (maxTabHeightIndex<simpleNavigationAdapter.getCount()-1){
for (int i = maxTabHeightIndex+1; i <simpleNavigationAdapter.getCount() ; i++) {
view = simpleNavigationAdapter.getHolderByPosition(i).mItemView;
constraintSet.connect(view.getId(),ConstraintSet.BOTTOM,previousId,ConstraintSet.BOTTOM);
previousId=view.getId();
ids[i]=view.getId();
}
}
// 第一个参数： 你这个链的左端需要连接到的控件的Id
// 第二个参数： 你这个链的左端需要连接到第一个参数指定的控件的那一边
// 第三个参数： 你这个链的右端需要连接大的控件的Id
// 第四个参数： 你这个链的右端需要连接到第三个参数指定的控件的那一边
// 第五个参数： 你这个链上多有控件的Id 的一个数组
// 第六个参数： 权重
// 第七个参数： 链的模式
constraintSet.createHorizontalChain(ConstraintSet.PARENT_ID,ConstraintSet.LEFT,ConstraintSet.PARENT_ID,ConstraintSet.RIGHT,ids,null,ConstraintSet.CHAIN_SPREAD_INSIDE);
constraintSet.applyTo(this);
//获取最大的数值 当padding
int padding = Math.max(mMarginBottom, mMarginTop);
//通过最小tab的宽度/2 获取左边距离，右边距离的最小
int paddingOffset = Math.min(minTabWidth / 2, Math.min(mMarginLeft, mMarginRight));
//如果有分割线 就让padding+线的宽度， 没有就padding
int paddingTop = mHasDeliverLine ? padding + mDeliverLineWidth : padding;
//对适配器监听
for (int i = 0; i < simpleNavigationAdapter.getCount(); i++) {
simpleNavigationAdapter.getHolderByPosition(i).mItemView.setPadding(paddingOffset,paddingTop,paddingOffset,padding);
}
setPadding(mMarginLeft-paddingOffset,0,mMarginRight-paddingOffset,0);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mHasDeliverLine){
canvas.drawLine(0,0,getWidth(),0,mLinePaint);
}
}
//创建适配器
public static class SimpleNavigationAdapter implements NavigationAdapter <SimpleNavigationAdapter.SimpleTabHolder>{
private int mInd=1000;
private ArrayList<TabBean> list;
private ArrayList<SimpleTabHolder> simpleTabHolders=new ArrayList<>();
private boolean isFirst=true;
private CheckBox mPreCheckedTab;
public SimpleNavigationAdapter(ArrayList<TabBean> list) {
this.list = list;
}
@Override
public SimpleTabHolder createHolder(ViewGroup parent, int position) {
final BottomNavigationView bottomNavigationView=(BottomNavigationView)parent;
CheckBox checkBox = new CheckBox(parent.getContext());
checkBox.setTag(position);//得到tag
checkBox.setId(mInd++);//id
checkBox.setButtonDrawable(null);//取消掉小方格
checkBox.setGravity(Gravity.CENTER);
checkBox.setTextColor(bottomNavigationView.mTextColorStateList);
int mTextSize = bottomNavigationView.mTextSize;
if (mTextSize>0){
checkBox.setTextSize(TypedValue.COMPLEX_UNIT_PX,mTextSize);
}
//监听
checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
//判断监听不为空
if (bottomNavigationView.mTabSelectedListener != null) {
//如果為true
if (isChecked) {
//判断当前的view 是否是上一个view 不是
if (mPreCheckedTab != buttonView) {
//设置点击成功
bottomNavigationView.mTabSelectedListener.onTabSelect(buttonView, (Integer) buttonView.getTag());
//如果上一个tab 不为空
if (mPreCheckedTab!=null){
//取消
bottomNavigationView.mTabSelectedListener.onTabUnSelect(mPreCheckedTab, (Integer) mPreCheckedTab.getTag());
//以为再次点击后上一次没有设置为false 又因为点击了当前 没法将再次执行下面代码
//所有定义一个空的变量并将mPreCheckedTab赋值
CheckBox temp = mPreCheckedTab;
//将当前的赋值给mPreCheckedTab
mPreCheckedTab= (CheckBox) buttonView;
//temp 是否选中设为false
temp.setChecked(false);
//当不上多次点击就不必要向下执行
return;
}
//当当前的view 复值给mPreCheckedTab 后 取消的没法执行mPreCheckedTab= (CheckBox) buttonView;代码
mPreCheckedTab= (CheckBox) buttonView;
}
} else {
if(mPreCheckedTab==buttonView){
bottomNavigationView.mTabSelectedListener.onTabReSelected(buttonView, (Integer) buttonView.getTag());
mPreCheckedTab.setChecked(true);
}
}
}
}
});
SimpleTabHolder simpleTabHolder = new SimpleTabHolder(checkBox);
simpleTabHolders.add(simpleTabHolder);
return simpleTabHolder;
}
@Override
public void bindData(SimpleTabHolder view, final int position) {
//获取icon
Drawable drawable = view.mItemView.getResources().getDrawable(list.get(position).getDrawable());
//获取当前的 父布局
BottomNavigationView navigationView = (BottomNavigationView) view.mItemView.getParent();
//进行判断 如果icon 的宽和高都大于0
if (navigationView.mDrawableIconWidth > 0 && navigationView.mDrawableIconHeight > 0) {
//就设置icon 的边距
drawable.setBounds(0, 0, navigationView.mDrawableIconWidth, navigationView.mDrawableIconHeight);
view.mItemView.setCompoundDrawables(null, drawable, null, null);
} else {
view.mItemView.setCompoundDrawablesWithIntrinsicBounds(null, drawable, null, null);
}
view.mItemView.setText(list.get(position).getTitle());
if (navigationView.mCurrentPosition==position){
view.mItemView.setChecked(true);
if (navigationView.mTabSelectedListener==null){
mPreCheckedTab=view.mItemView;
}
}
}
@Override
public int getCount() {
return list==null?0:list.size();
}
@Override
public SimpleTabHolder getHolderByPosition(int position) {
return simpleTabHolders.size()==0?null:simpleTabHolders.get(position);
}
public class SimpleTabHolder extends TabHolder<CheckBox> {
SimpleTabHolder(CheckBox view) {
super(view);
}
}
}
private static abstract class TabHolder<T extends View>{
protected T mItemView;
public TabHolder(T t){
this.mItemView=t;
}
}
//创建适配器的接口
public interface NavigationAdapter <TH extends TabHolder>{
TH createHolder(ViewGroup parent, int position);
void bindData(TH view, int position);
int getCount();
TH getHolderByPosition(int position);
}
//创建bean类
public static class TabBean{
private int drawable;
private String title;
public TabBean(int drawable, String title) {
this.drawable = drawable;
this.title = title;
}
public int getDrawable() {
return drawable;
}
public void setDrawable(int drawable) {
this.drawable = drawable;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
//dp 转px
public int dip2px(float dpValue) {
final float scale = getContext().getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
public interface OnTabSelectedListener {
void onTabSelect(View tab, int position);
void onTabUnSelect(View tab, int position);
void onTabReSelected(View tab, int position);
}
}
使用 及效果
<com.wds.bannerlib.navigation.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:bottomNavigationTextColor="@color/bottom_navigation_text_color"
app:bottomNavigationTextSize="10dp"
app:bottomNavigationLeftMargin="27dp"
app:bottomNavigationRightMargin="27dp"
app:bottomNavigationTopMargin="6dp"
app:bottomNavigationBottomMargin="6dp"
app:bottomNavigationDeliverLine="true"
app:bottomNavigationDeliverLineWidth="1dp"
app:bottomNavigationDeliverLineColor="@color/gray"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
/>
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