Android(安卓)自定义角标

Android的开发中，坚持强大的通知栏，用户通知有些地方需依赖数字角标，因此参考资料做些记录；
首先来看以下用法：

public class MainActivity extends Activity {    Button mCloseButton;    Button mOpenButton;    MultiDirectionSlidingDrawer mDrawer;    private ImageView bt;    private BadgeView bg;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main_badge_layout);        bt=(ImageView)findViewById(R.id.badge_image_view);        bg=new BadgeView(getApplicationContext(),bt);        bg.setText("12");        bg.setTextColor(Color.WHITE);        bg.setBadgePosition(BadgeView.POSITION_TOP_RIGHT);        bg.setBadgeMargin(0,0);        bg.setAnimation(alphaAnimation);        bg.show();   }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">  <ImageView      android:id="@+id/badge_image_view"      android:layout_width="120dp"      android:layout_height="120dp"      android:text="@string/app_name"      android:src="@drawable/icon"      android:layout_alignParentTop="true"      android:layout_alignParentLeft="true"      android:layout_marginLeft="98dp"      android:layout_marginTop="126dp" />LinearLayout>

要实现这个角标，我们一想有以下几种方式：
1、放置一个隐藏的图片在app中，在需要它显示的时候，显示该图片，并以该图片为背景，显示新增消息数；
2、自定义一个控件，用于显示该角标信息。例如，角标相对于控件的位置、底色、数字等；
对比或者使用后，你会发现，自定义一个控件，无疑更符合我们的使用习惯。无需特定的图片，减少了app的大小等，更重要的是，这样方便我们的使用。
在角标实现中，有个开源代码BadgeView写的很符合我们的心理预期。实现了我们常用的所有功能。
BadgeView
这是一个继承TextView控件，自定义而成的一个简单控件。我们通过它，可轻易实现对角标位置、角标底色、角标内容等控制。

package it.sephiroth.demo.slider.widget;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.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;import android.widget.TextView;/** * A simple text label view that can be applied as a "badge" to any given {@link android.view.View}. * This class is intended to be instantiated at runtime rather than included in XML layouts. */public class BadgeView extends TextView {    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 = 3;    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("#FF3E3D"); //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 -     *     * 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 -     *     * 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, -3, paddingPixels, -3);        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    public boolean isShown() {        return isShown;    }    /**     * Returns the positioning of this badge.     *     * one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSTION_CENTER.     *     */    public int getBadgePosition() {        return badgePosition;    }    /**     * Set the positioning of this badge.     *     * @param layoutPosition one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSTION_CENTER.     *     */    public void setBadgePosition(int layoutPosition) {        this.badgePosition = layoutPosition;    }    /**     * Returns the horizontal margin from the target View that is applied to this badge.     *     */    public int getHorizontalBadgeMargin() {        return badgeMarginH;    }    /**     * Returns the vertical margin from the target View that is applied to this badge.     *     */    public int getVerticalBadgeMargin() {        return badgeMarginV;    }    /**     * Set the horizontal/vertical margin from the target View that is applied to this badge.     *     * @param badgeMargin the margin in pixels.     */    public void setBadgeMargin(int badgeMargin) {        this.badgeMarginH = badgeMargin;        this.badgeMarginV = badgeMargin;    }    /**     * Set the horizontal/vertical margin from the target View that is applied to this badge.     *     * @param horizontal margin in pixels.     * @param vertical margin in pixels.     */    public void setBadgeMargin(int horizontal, int vertical) {        this.badgeMarginH = horizontal;        this.badgeMarginV = vertical;    }    /**     * Returns the color value of the badge background.     *     */    public int getBadgeBackgroundColor() {        return badgeColor;    }    /**     * Set the color value of the badge background.     *     * @param badgeColor the badge background color.     */    public void setBadgeBackgroundColor(int badgeColor) {        this.badgeColor = badgeColor;        badgeBg = getDefaultBackground();    }    private int dipToPixels(int dip) {        Resources r = getResources();        float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, r.getDisplayMetrics());        return (int) px;    }}

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