- 默认选中第一个子条目
使用
xml布局
<com.example.navigationlib.BottomNavigation
android:id="@+id/bottomNavigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:bottomNavigationBottomMargin="6dp"
app:bottomNavigationDeliverLine="true"
app:bottomNavigationDeliverLineColor="@color/gray"
app:bottomNavigationDeliverLineWidth="1dp"
app:bottomNavigationLeftMargin="27dp"
app:bottomNavigationRightMargin="27dp"
app:bottomNavigationTextColor="@color/bottom_navigation_text_color"
app:bottomNavigationTextSize="10dp"
app:bottomNavigationTopMargin="6dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
private BottomNavigation bottomNavigation;
private BaseFragment fragment ;
//找控件
bottomNavigation = (BottomNavigation) findViewById(R.id.bottomNavigation);
/**
* addItem() 添加子控件
*
* @param int drawableId 图片
* @param String title 标题
*/
bottomNavigation.addItem(R.drawable.tab_recommend_selector,"推荐")
.addItem(R.drawable.tab_special_selector, "专题")
.addItem(R.drawable.tab_mine_selector, "我的")
.apply();//提交
//存放Fragment
Object[] arr = new Object[3];
arr[0] = MenuFragment.class;
arr[1] = SpecialFragment.class;
arr[2] = MyFrament.class;
/**
* setTabSelectedListener() 自控件选中监听
* onTabSelect() 选中
* onTabUnSelect() 未选中
* onTabReSelected() 重新选中
*/
bottomNavigation.setTabSelectedListener(new BottomNavigation.OnTabSelectedListener() {
@Override
public void onTabSelect(View tab, int position) {
/**
* MvpFragmentManager 添加Fragment的工具类
* addOrShowFragment() 添加Fragment方法
*
* @param FragmentManager manager 布局管理器
* @param Class<? extends BaseFragment> willShowFragment 将要进入的Fragment
* @param BaseFragment preFragment 将要退出的Fragment（可以为null）
* @param @IdRes int containerId 放置Fragment的容器FrameLayout
*/
fragment = (BaseFragment) MvpFragmentManager.addOrShowFragment(getSupportFragmentManager(), (Class<? extends BaseFragment>) arr[position], fragment, R.id.home_menu_fl);
}
@Override
public void onTabUnSelect(View tab, int position) {
// Toast.makeText(HomeActivity.this, "tab = "+tab+",position = "+position, Toast.LENGTH_SHORT).show();
}
@Override
public void onTabReSelected(View tab, int position) {
// Toast.makeText(HomeActivity.this, "tab = "+tab+",position = "+position, Toast.LENGTH_SHORT).show();
}
});
BottomNavigation类 ( 自定义底部导航栏 )
package com.example.navigationlib;
import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import androidx.annotation.DrawableRes;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.constraintlayout.widget.ConstraintSet;
import java.util.ArrayList;
public class BottomNavigation extends ConstraintLayout {
private static final int HORIZONTAL_MARGIN_DP = 32;
private static final int VERTICAL_MARGIN_DP = 12;
private NavigationAdapter mAdapter;
private ArrayList<Integer> mDrawableRes = new ArrayList<>();
private ArrayList<String> mTitles = new ArrayList<>();
private ColorStateList mTextColorStateList;
private OnTabSelectedListener mTabSelectedListener;
private Paint mLinePaint;
private int mMarginLeft;
private int mMarginBottom;
private int mMarginRight;
private int mMarginTop;
private int mDrawableMargin;
private int mTextSize;
private int mDrawableIconWidth;
private int mDrawableIconHeight;
private int mDeliverLineWidth;
private int mDeliverLineColor;
private int mCurrentPosition = 0;
private boolean mHasDeliverLine; // 是否显示分割线
public BottomNavigation(Context context) {
super(context);
}
public BottomNavigation(Context context, AttributeSet attrs) {
super(context, attrs);
initValue(attrs);
}
public BottomNavigation(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initValue(attrs);
}
private void initValue(AttributeSet set) {
TypedArray array = getContext().obtainStyledAttributes(set, R.styleable.BottomNavigation);
mMarginLeft = array.getDimensionPixelSize(R.styleable.BottomNavigation_bottomNavigationLeftMargin, dip2px(getContext(), HORIZONTAL_MARGIN_DP));
mMarginRight = array.getDimensionPixelSize(R.styleable.BottomNavigation_bottomNavigationRightMargin, dip2px(getContext(), HORIZONTAL_MARGIN_DP));
mMarginTop = array.getDimensionPixelSize(R.styleable.BottomNavigation_bottomNavigationTopMargin, dip2px(getContext(), VERTICAL_MARGIN_DP));
mMarginBottom = array.getDimensionPixelSize(R.styleable.BottomNavigation_bottomNavigationBottomMargin, dip2px(getContext(), VERTICAL_MARGIN_DP));
mDrawableIconWidth = array.getDimensionPixelSize(R.styleable.BottomNavigation_bottomNavigationDrawableWidth, 0);
mDrawableIconHeight = array.getDimensionPixelSize(R.styleable.BottomNavigation_bottomNavigationDrawableHeight, 0);
mDrawableMargin = array.getDimensionPixelSize(R.styleable.BottomNavigation_bottomNavigationDrawableMargin, 0);
mTextSize = array.getDimensionPixelSize(R.styleable.BottomNavigation_bottomNavigationTextSize, 0);
mTextColorStateList = array.getColorStateList(R.styleable.BottomNavigation_bottomNavigationTextColor);
mHasDeliverLine = array.getBoolean(R.styleable.BottomNavigation_bottomNavigationDeliverLine, true);
mDeliverLineWidth = array.getDimensionPixelSize(R.styleable.BottomNavigation_bottomNavigationDeliverLineWidth, dip2px(getContext(), 1));
mDeliverLineColor = array.getColor(R.styleable.BottomNavigation_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;
if (mAdapter != null) {
View tabView = mAdapter.getHolderByPosition(mCurrentPosition).mItemView;
mTabSelectedListener.onTabSelect(tabView, (Integer) tabView.getTag());
}
}
public BottomNavigation addItem(@DrawableRes int drawableId, String title) {
mDrawableRes.add(drawableId);
mTitles.add(title);
return this;
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
}
public BottomNavigation setCurrentPosition(int position) {
mCurrentPosition = position;
return this;
}
public void apply() {
// 把这些drawable 和 title 应用到 我的布局上
if (mDrawableRes.size() > 0) {
ArrayList<TabData> list = new ArrayList<>();
for (int i = 0; i < mDrawableRes.size(); i++) {
list.add(new TabData(mDrawableRes.get(i), mTitles.get(i)));
}
apply(new SimpleNavigationAdapter(list));
}
}
public void apply(NavigationAdapter<? extends TabHolder> adapter) {
mAdapter = 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
for (int i = 0; i < mAdapter.getCount(); i++) {
TabHolder holder = mAdapter.createHolder(this, i);
addView(holder.mItemView);
mAdapter.bindData(holder, i);
// 计算每一个tab 的宽和高
holder.mItemView.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.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[mAdapter.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 = mAdapter.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();
if (maxTabHeightIndex > 0) {
for (int i = maxTabHeightIndex - 1; i >= 0; i--) {
view = mAdapter.getHolderByPosition(i).mItemView;
constraintSet.connect(view.getId(), ConstraintSet.BOTTOM, previousId, ConstraintSet.BOTTOM);
previousId = view.getId();
ids[i] = view.getId();
}
}
if (maxTabHeightIndex < mAdapter.getCount() - 1) {
for (int i = maxTabHeightIndex + 1; i < mAdapter.getCount(); i++) {
view = mAdapter.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);
// 通过设置 tab 的 padding 来扩大点击事件区域
int padding = Math.max(mMarginBottom, mMarginTop);
int paddingOffset = Math.min(minTabWidth / 2, Math.min(mMarginLeft, mMarginRight));
int paddingTop = mHasDeliverLine ? padding + mDeliverLineWidth : padding;
for (int i = 0; i < mAdapter.getCount(); i++) {
mAdapter.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);
}
}
public static class SimpleNavigationAdapter implements NavigationAdapter<SimpleNavigationAdapter.SimpleTabHolder> {
private int mId = 1000;
private ArrayList<TabData> mTabData;
private ArrayList<SimpleTabHolder> mHolders = new ArrayList<>();
private boolean isFirst = true;
private CheckBox mPreCheckedTab;
SimpleNavigationAdapter(ArrayList<TabData> tabData) {
this.mTabData = tabData;
}
@Override
public SimpleTabHolder createHolder(ViewGroup parent, int position) {
final BottomNavigation navigation = ((BottomNavigation) parent);
CheckBox tabView = new CheckBox(parent.getContext());
tabView.setTag(position);
tabView.setId(mId + position);
tabView.setButtonDrawable(null);
tabView.setGravity(Gravity.CENTER);
tabView.setTextColor(navigation.mTextColorStateList);
int textSize = navigation.mTextSize;
if (textSize > 0) {
tabView.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
}
tabView.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (navigation.mTabSelectedListener != null) {
if (isChecked) {
if (mPreCheckedTab != buttonView) {
navigation.mTabSelectedListener.onTabSelect(buttonView, (Integer) buttonView.getTag());
if (mPreCheckedTab != null) {
navigation.mTabSelectedListener.onTabUnSelect(mPreCheckedTab, (Integer) mPreCheckedTab.getTag());
CheckBox temp = mPreCheckedTab;
mPreCheckedTab = (CheckBox) buttonView;
temp.setChecked(false);
return;
}
mPreCheckedTab = (CheckBox) buttonView;
}
} else {
if (mPreCheckedTab == buttonView) {
navigation.mTabSelectedListener.onTabReSelected(buttonView, (Integer) buttonView.getTag());
mPreCheckedTab.setChecked(true);
}
}
}
}
});
SimpleTabHolder holder = new SimpleTabHolder(tabView);
mHolders.add(holder);
return holder;
}
private void select(int position) {
getHolderByPosition(position).mItemView.setChecked(true);
}
@Override
public void bindData(SimpleTabHolder holder, int position) {
Drawable topDrawable = holder.mItemView.getContext().getResources().getDrawable(mTabData.get(position).getDrawableId());
BottomNavigation navigation = (BottomNavigation) holder.mItemView.getParent();
if (navigation.mDrawableIconWidth > 0 && navigation.mDrawableIconHeight > 0) {
topDrawable.setBounds(0, 0, navigation.mDrawableIconWidth, navigation.mDrawableIconHeight);
holder.mItemView.setCompoundDrawables(null, topDrawable, null, null);
} else {
holder.mItemView.setCompoundDrawablesWithIntrinsicBounds(null, topDrawable, null, null);
}
holder.mItemView.setText(mTabData.get(position).getTitle());
if (navigation.mCurrentPosition == position) {
holder.mItemView.setChecked(true);
if(navigation.mTabSelectedListener == null){
mPreCheckedTab = holder.mItemView;
}
}
}
@Override
public int getCount() {
return mTabData == null ? 0 : mTabData.size();
}
@Override
public SimpleTabHolder getHolderByPosition(int position) {
return mHolders.size() == 0 ? null : mHolders.get(position);
}
static class SimpleTabHolder extends TabHolder<CheckBox> {
SimpleTabHolder(CheckBox itemView) {
super(itemView);
}
}
}
public static abstract class TabHolder<T extends View> {
protected T mItemView;
public TabHolder(T itemView) {
this.mItemView = itemView;
}
}
public interface NavigationAdapter<TH extends TabHolder> {
TH createHolder(ViewGroup parent, int position);
void bindData(TH holder, int position);
int getCount();
TH getHolderByPosition(int position);
}
private static class TabData {
private int drawableId;
private String title;
TabData(int drawableId, String title) {
this.drawableId = drawableId;
this.title = title;
}
int getDrawableId() {
return drawableId;
}
String getTitle() {
return title;
}
}
public interface OnTabSelectedListener {
void onTabSelect(View tab, int position);
void onTabUnSelect(View tab, int position);
void onTabReSelected(View tab, int position);
}
public static int dip2px(Context context,float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
}
自定义属性
在res文件下values中添加attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="BottomNavigation">
<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>
<declare-styleable name="MarqueeView">
<attr name="textSize" format="dimension" />
<attr name="textColor" format="color" />
<attr name="speed" format="integer" />
<attr name="spacing" format="dimension" />
</declare-styleable>
</resources>
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