Android自定义底部菜单栏控件

在App开发时经常会遇到需要做类似微信底部切换按钮那样的菜单栏，所以封装了一个底部菜单控件，方便日后使用。
先看一下demo效果

先看如何进行使用，在看如何实现。
1、在activity_main.xml布局里引用控件

2、在activity进行设置数据

public class MainActivity extends AppCompatActivity {
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BottomMenuView bmv_list = (BottomMenuView) findViewById(R.id.bmv_list);
        //设置bottom数据
        bmv_list.setBottomItem(getData());
        //监听点击事件
        bmv_list.setBottomItemOnClickListener(new BottomMenuView.BottomItemOnClickListener() {
            @Override
            public void bottomItemOnClick(View view, int i, BottomItem item) {
                Toast.makeText(getApplicationContext(),"点击了第"+i+"个",Toast.LENGTH_SHORT).show();
            }
        });
        //默认选择第几个
        bmv_list.setShowIndex(0);
    }
    /**
     * 创建bottom数据
     * @return
     */
    public List<BottomItem> getData(){
        List<BottomItem> items = new ArrayList<>();
        items.add(new BottomItem("首页",R.mipmap.icon_function_tab));
        items.add(new BottomItem("信息",R.mipmap.icon_home_tab));
        items.add(new BottomItem("应用",R.mipmap.icon_my_tab));
        items.add(new BottomItem("我的",R.mipmap.icon_home_tab));
        return items;
    }
}

Bottomitem的代码

public class BottomItem {
    private String name;
    private int icon;
    public BottomItem(String name, int icon) {
        this.name = name;
        this.icon = icon;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public int getIcon() {
        return icon;
    }

    public void setIcon(int icon) {
        this.icon = icon;
    }
}

是不是很方便呢！

现在来BottomMenuView看看是怎么实现的

public class BottomMenuView extends LinearLayout implements View.OnClickListener{
    private static final String TAG = "BottomMenuView";
    private Context mContext;
    private int imgColor = 0xff009AFF;//点击改变图片颜色
    private int imgDefaultColor = 0xff565656;//默认图片颜色
    private float textSize = 12; //字体大小
    private int imgPadding = 12; //内边距
    private List<BottomItem> bottomItems;//Item列表
    private List<Button> buttons;//buttom列表
    private int width;
    private int hight;
    //回调接口
    private BottomItemOnClickListener bottomItemOnClickListener;
    public BottomMenuView(Context context) {
        super(context);
        initView(context);
    }
    public BottomMenuView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView(context);
    }
    public BottomMenuView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView(context);
    }
    public void initView(Context context){
        mContext =context;
        buttons = new ArrayList<>();//实例化按钮列表
    }
    /**
     * 传入item列表
     * @param bottomItems
     */
    public void setBottomItem(List<BottomItem> bottomItems){
        this.bottomItems = bottomItems;
        //循环button按钮
        for (int i = 0; i < bottomItems.size(); i++) {
            //创建button
            Button buttom = new Button(mContext);
            //设置宽和高为MATCH_PARENT
            LayoutParams layoutParams = new LayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
            buttom.setLayoutParams(layoutParams);
            //字体居中
            buttom.setGravity(Gravity.CENTER);
            //设置文字
            buttom.setText(bottomItems.get(i).getName());
            //设置文字大小
            buttom.setTextSize(textSize);
            //设置内边距
            buttom.setPadding(imgPadding,imgPadding,imgPadding,imgPadding);
            //去掉button背景
            buttom.setBackground(null);
            //获取图标资源
            Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(),bottomItems.get(i).getIcon());
            //设置图标默认颜色
            Drawable drawable = new BitmapDrawable(getResources(),tintBitmap(bitmap,imgDefaultColor));
            //设置图标
            buttom.setCompoundDrawablesWithIntrinsicBounds(null,drawable,null,null);
            //将item设置到tag中下一步需要用到
            buttom.setTag(bottomItems.get(i));
            //设置监听
            buttom.setOnClickListener(this);
            //添加到当前布局
            addView(buttom);
            //添加到按钮组里
            buttons.add(buttom);
        }
    }
    private boolean isShow = false;
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        //计算每一个子button的宽度 并且判断只计算一次
        if (!isShow){
            for (int i = 0; i < getChildCount(); i++) {
                LinearLayout.LayoutParams ll = (LayoutParams) getChildAt(i).getLayoutParams();
                ll.width=width/bottomItems.size();
                getChildAt(i).setLayoutParams(ll);
            }
            isShow=true;
        }
    }
    /**
     * 手动设置选中的button
    **/
    public void setShowIndex(int index){
        if (buttons.size()!=0){
            BottomItem bottomItem = (BottomItem) buttons.get(index).getTag();
            getBitmap(buttons.get(index),bottomItem.getIcon(),imgColor);
            bottomItemOnClickListener.bottomItemOnClick(buttons.get(index),index,bottomItem);
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        width = MeasureSpec.getSize(widthMeasureSpec);
        hight = MeasureSpec.getSize(heightMeasureSpec);
    }

    /**
     * 改变选中颜色
     * @param btn
     * @param img
     * @param color
     */
    public void getBitmap(Button btn, int img, int color){
        btn.setTextColor(color);
        Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(),img);
        Drawable drawable = new BitmapDrawable(mContext.getResources(), tintBitmap(bitmap,color));
        btn.setCompoundDrawablesWithIntrinsicBounds(null,drawable,null,null);
    }

    /**
     * 对每一个BUTTON进行监听
     * @param view
     */
    @Override
    public void onClick(View view) {
        for (int i = 0; i < buttons.size(); i++) {
            BottomItem bottomItem = (BottomItem) buttons.get(i).getTag();//从tag中获取BottomItem
            getBitmap(buttons.get(i),bottomItem.getIcon(),imgDefaultColor);//重置按钮颜色
            if (buttons.get(i).getTag()==view.getTag()){//判断点击的是哪个按钮
                getBitmap(buttons.get(i),bottomItem.getIcon(),imgColor);//更改被点击的按钮牙
                if (bottomItemOnClickListener != null) {
                    //通知回调
                    bottomItemOnClickListener.bottomItemOnClick(view,i,bottomItem);
                }
            }
        }

    }
    public BottomItemOnClickListener getBottomItemOnClickListener() {
        return bottomItemOnClickListener;
    }
    
    public void setBottomItemOnClickListener(BottomItemOnClickListener bottomItemOnClickListener) {
        this.bottomItemOnClickListener = bottomItemOnClickListener;
    }
    /**
     * 点击监听回调接口
     */
    public interface BottomItemOnClickListener{
        void bottomItemOnClick(View view, int i,BottomItem item);
    }
    /**
     * 改变颜色
     * @param inBitmap
     * @param tintColor
     * @return
     */
    public static Bitmap tintBitmap(Bitmap inBitmap , int tintColor) {
        if (inBitmap == null) {
            return null;
        }
        Bitmap outBitmap = Bitmap.createBitmap (inBitmap.getWidth(), inBitmap.getHeight() , inBitmap.getConfig());
        Canvas canvas = new Canvas(outBitmap);
        Paint paint = new Paint();
        paint.setColorFilter( new PorterDuffColorFilter(tintColor, PorterDuff.Mode.SRC_IN)) ;
        canvas.drawBitmap(inBitmap , 0, 0, paint) ;
        return outBitmap ;
    }

    /**  get / set **/
    public int getImgDefaultColor() {
        return imgDefaultColor;
    }

    public void setImgDefaultColor(int imgDefaultColor) {
        this.imgDefaultColor = imgDefaultColor;
    }

    public int getImgColor() {
        return imgColor;
    }

    public void setImgColor(int imgColor) {
        this.imgColor = imgColor;
    }

    public float getTextSize() {
        return textSize;
    }

    public void setTextSize(float textSize) {
        this.textSize = textSize;
    }

    public int getImgPadding() {
        return imgPadding;
    }

    public void setImgPadding(int imgPadding) {
        this.imgPadding = imgPadding;
    }
}

代码比较简单，相信大家看一遍都可以理解。
全部代码已托管到开源中国的码云和GitHub上，欢迎下载。
地址：
https://github.com/yancy2430/BottomNavView
https://git.oschina.net/zhe2430/BottomNavView
也可以直接Gradle引用

compile 'com.tdeado:bottomnav:1.0.0'