RadioButton右上方帶數量顯示的電商架構必備

電商項目中必定會有購物車一欄，而購物車按鈕的右上方又必定會有一個紅色圓圈顯示數量的小頭標，如下圖：

面對這樣的介面，我們有很多中選擇來搭建架構，在這裡我只說2種我覺得還可以的。 第一：RadioButton+BadgeView配合顯示 1、底部按鈕導覽列的布局：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:background="@color/title_bg_color"    android:orientation="vertical">    <View        style="@style/ViewHorizontalLine"        android:layout_above="@+id/rg_tab_bar" />    <RadioGroup        android:id="@+id/rg_tab_bar"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:checkedButton="@+id/rbHome"        android:gravity="center_vertical"        android:orientation="horizontal"        android:paddingLeft="6dp"        android:paddingRight="6dp"        android:paddingTop="6dp">        <RadioButton            android:id="@+id/rbHome"            style="@style/RaidoButtonStyle"            android:drawableTop="@drawable/btn_tabbar_home_selector"            android:text="@string/tab_home" />        <RadioButton            android:id="@+id/rbBuy"            style="@style/RaidoButtonStyle"            android:drawableTop="@drawable/btn_tabbar_buy_selector"            android:text="@string/tab_buy" />        <RadioButton            android:id="@+id/rbCategory"            style="@style/RaidoButtonStyle"            android:drawableTop="@drawable/btn_tabbar_category_selector"            android:text="@string/tab_category" />        <RadioButton            android:id="@+id/rbCart"            style="@style/RaidoButtonStyle"            android:drawableTop="@drawable/btn_tabbar_cart_selector"            android:text="@string/tab_cart" />        <RadioButton            android:id="@+id/rbUserCenter"            style="@style/RaidoButtonStyle"            android:drawableTop="@drawable/btn_tabbar_user_center_selector"            android:text="@string/tab_user_center" />    </RadioGroup>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="55dp"        android:layout_alignParentBottom="true"        android:background="@color/transparent"        android:numColumns="5"        android:orientation="horizontal">        <Button style="@style/BadgeViewButtonStyle" />        <Button style="@style/BadgeViewButtonStyle" />        <Button style="@style/BadgeViewButtonStyle" />        <Button            android:id="@+id/btn_msg"            style="@style/BadgeViewButtonStyle" />        <Button style="@style/BadgeViewButtonStyle" />    </LinearLayout></RelativeLayout>

2、activity_main的布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity"    android:clipToPadding="true"    android:fitsSystemWindows="true">    <FrameLayout        android:id="@+id/fragmentContent"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:background="@color/white" />    <!--<include layout="@layout/bottom_tab_bar"/>--></LinearLayout>     

3、BadgeView的工具類：

import android.content.Context;import android.content.res.Resources;import android.graphics.Color;import android.graphics.Typeface;import android.graphics.drawable.ShapeDrawable;import android.graphics.drawable.shapes.RoundRectShape;import android.support.v7.widget.AppCompatTextView;import android.util.AttributeSet;import android.util.TypedValue;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.view.ViewParent;import android.view.animation.AccelerateInterpolator;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.DecelerateInterpolator;import android.widget.FrameLayout;import android.widget.TabWidget;/** * Description:com.mmbao.saas.util類 * Created by Administrator on 2018/1/25. * Maxim:There is no smoke without fire */public class BadgeView extends AppCompatTextView {    public static final int POSITION_TOP_LEFT = 1;    public static final int POSITION_TOP_RIGHT = 2;    public static final int POSITION_BOTTOM_LEFT = 3;    public static final int POSITION_BOTTOM_RIGHT = 4;    public static final int POSITION_CENTER = 5;    private static final int DEFAULT_MARGIN_DIP = 5;    private static final int DEFAULT_LR_PADDING_DIP = 5;    private static final int DEFAULT_CORNER_RADIUS_DIP = 8;    private static final int DEFAULT_POSITION = POSITION_TOP_RIGHT;    private static final int DEFAULT_BADGE_COLOR = Color.parseColor("#CCFF0000"); //Color.RED;    private static final int DEFAULT_TEXT_COLOR = Color.WHITE;    private static Animation fadeIn;    private static Animation fadeOut;    private Context context;    private View target;    private int badgePosition;    private int badgeMarginH;    private int badgeMarginV;    private int badgeColor;    private boolean isShown;    private ShapeDrawable badgeBg;    private int targetTabIndex;    public BadgeView(Context context) {        this(context, (AttributeSet) null, android.R.attr.textViewStyle);    }    public BadgeView(Context context, AttributeSet attrs) {        this(context, attrs, android.R.attr.textViewStyle);    }    /**     * Constructor -     * <p>     * create a new BadgeView instance attached to a target {@link android.view.View}.     *     * @param context context for this view.     * @param target  the View to attach the badge to.     */    public BadgeView(Context context, View target) {        this(context, null, android.R.attr.textViewStyle, target, 0);    }    /**     * Constructor -     * <p>     * create a new BadgeView instance attached to a target {@link android.widget.TabWidget}     * tab at a given index.     *     * @param context context for this view.     * @param target  the TabWidget to attach the badge to.     * @param index   the position of the tab within the target.     */    public BadgeView(Context context, TabWidget target, int index) {        this(context, null, android.R.attr.textViewStyle, target, index);    }    public BadgeView(Context context, AttributeSet attrs, int defStyle) {        this(context, attrs, defStyle, null, 0);    }    public BadgeView(Context context, AttributeSet attrs, int defStyle, View target, int tabIndex) {        super(context, attrs, defStyle);        init(context, target, tabIndex);    }    private void init(Context context, View target, int tabIndex) {        this.context = context;        this.target = target;        this.targetTabIndex = tabIndex;        // apply defaults        badgePosition = DEFAULT_POSITION;        badgeMarginH = dipToPixels(DEFAULT_MARGIN_DIP);        badgeMarginV = badgeMarginH;        badgeColor = DEFAULT_BADGE_COLOR;        setTypeface(Typeface.DEFAULT_BOLD);        int paddingPixels = dipToPixels(DEFAULT_LR_PADDING_DIP);        setPadding(paddingPixels, 0, paddingPixels, 0);        setTextColor(DEFAULT_TEXT_COLOR);        fadeIn = new AlphaAnimation(0, 1);        fadeIn.setInterpolator(new DecelerateInterpolator());        fadeIn.setDuration(200);        fadeOut = new AlphaAnimation(1, 0);        fadeOut.setInterpolator(new AccelerateInterpolator());        fadeOut.setDuration(200);        isShown = false;        if (this.target != null) {            applyTo(this.target);        } else {            show();        }    }    private void applyTo(View target) {        LayoutParams lp = target.getLayoutParams();        ViewParent parent = target.getParent();        FrameLayout container = new FrameLayout(context);        if (target instanceof TabWidget) {            // set target to the relevant tab child container            target = ((TabWidget) target).getChildTabViewAt(targetTabIndex);            this.target = target;            ((ViewGroup) target).addView(container,                    new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));            this.setVisibility(View.GONE);            container.addView(this);        } else {            // TODO verify that parent is indeed a ViewGroup            ViewGroup group = (ViewGroup) parent;            int index = group.indexOfChild(target);            group.removeView(target);            group.addView(container, index, lp);            container.addView(target);            this.setVisibility(View.GONE);            container.addView(this);            group.invalidate();        }    }    /**     * Make the badge visible in the UI.     */    public void show() {        show(false, null);    }    /**     * Make the badge visible in the UI.     *     * @param animate flag to apply the default fade-in animation.     */    public void show(boolean animate) {        show(animate, fadeIn);    }    /**     * Make the badge visible in the UI.     *     * @param anim Animation to apply to the view when made visible.     */    public void show(Animation anim) {        show(true, anim);    }    /**     * Make the badge non-visible in the UI.     */    public void hide() {        hide(false, null);    }    /**     * Make the badge non-visible in the UI.     *     * @param animate flag to apply the default fade-out animation.     */    public void hide(boolean animate) {        hide(animate, fadeOut);    }    /**     * Make the badge non-visible in the UI.     *     * @param anim Animation to apply to the view when made non-visible.     */    public void hide(Animation anim) {        hide(true, anim);    }    /**     * Toggle the badge visibility in the UI.     */    public void toggle() {        toggle(false, null, null);    }    /**     * Toggle the badge visibility in the UI.     *     * @param animate flag to apply the default fade-in/out animation.     */    public void toggle(boolean animate) {        toggle(animate, fadeIn, fadeOut);    }    /**     * Toggle the badge visibility in the UI.     *     * @param animIn  Animation to apply to the view when made visible.     * @param animOut Animation to apply to the view when made non-visible.     */    public void toggle(Animation animIn, Animation animOut) {        toggle(true, animIn, animOut);    }    private void show(boolean animate, Animation anim) {        if (getBackground() == null) {            if (badgeBg == null) {                badgeBg = getDefaultBackground();            }            setBackgroundDrawable(badgeBg);        }        applyLayoutParams();        if (animate) {            this.startAnimation(anim);        }        this.setVisibility(View.VISIBLE);        isShown = true;    }    private void hide(boolean animate, Animation anim) {        this.setVisibility(View.GONE);        if (animate) {            this.startAnimation(anim);        }        isShown = false;    }    private void toggle(boolean animate, Animation animIn, Animation animOut) {        if (isShown) {            hide(animate && (animOut != null), animOut);        } else {            show(animate && (animIn != null), animIn);        }    }    /**     * Increment the numeric badge label. If the current badge label cannot be converted to     * an integer value, its label will be set to "0".     *     * @param offset the increment offset.     */    public int increment(int offset) {        CharSequence txt = getText();        int i;        if (txt != null) {            try {                i = Integer.parseInt(txt.toString());            } catch (NumberFormatException e) {                i = 0;            }        } else {            i = 0;        }        i = i + offset;        setText(String.valueOf(i));        return i;    }    /**     * Decrement the numeric badge label. If the current badge label cannot be converted to     * an integer value, its label will be set to "0".     *     * @param offset the decrement offset.     */    public int decrement(int offset) {        return increment(-offset);    }    private ShapeDrawable getDefaultBackground() {        int r = dipToPixels(DEFAULT_CORNER_RADIUS_DIP);        float[] outerR = new float[]{r, r, r, r, r, r, r, r};        RoundRectShape rr = new RoundRectShape(outerR, null, null);        ShapeDrawable drawable = new ShapeDrawable(rr);        drawable.getPaint().setColor(badgeColor);        return drawable;    }    private void applyLayoutParams() {        FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);        switch (badgePosition) {            case POSITION_TOP_LEFT:                lp.gravity = Gravity.LEFT | Gravity.TOP;                lp.setMargins(badgeMarginH, badgeMarginV, 0, 0);                break;            case POSITION_TOP_RIGHT:                lp.gravity = Gravity.RIGHT | Gravity.TOP;                lp.setMargins(0, badgeMarginV, badgeMarginH, 0);                break;            case POSITION_BOTTOM_LEFT:                lp.gravity = Gravity.LEFT | Gravity.BOTTOM;                lp.setMargins(badgeMarginH, 0, 0, badgeMarginV);                break;            case POSITION_BOTTOM_RIGHT:                lp.gravity = Gravity.RIGHT | Gravity.BOTTOM;                lp.setMargins(0, 0, badgeMarginH, badgeMarginV);                break;            case POSITION_CENTER:                lp.gravity = Gravity.CENTER;                lp.setMargins(0, 0, 0, 0);                break;            default:                break;        }        setLayoutParams(lp);    }    /**     * Returns the target View this badge has been attached to.     */    public View getTarget() {        return target;    }    /**     * Is this badge currently visible in the UI?     */    @Override    pu