android BadgerView 提示小圆点

BadgeView使用介绍 ：
BadgeView主要是继承了TextView，所以实际上就是一个TextView，
底层放了一个label，可以自定义背景图，自定义背景颜色，
是否显示，显示进入的动画效果以及显示的位置等等；


主要方法：
除了父类TextView本身的方法以外，
子类的方法主要在于设置label的属性，
包括显示位置，背景图，背景颜色，动画效果等；


setBadgePosition(); //设置显示位置；

setBadgeMargin(); //设置边距

setBadgeBackgroundColor(); //设置背景颜色

Toggle方法是显示和隐藏的，可以带进入和退出的动画效果；

Hide和Show也分别是隐藏和显示的方法，同样可以带进入和退出的动画效果；

动画效果可以自定义，使用比较灵活简便。

针对源码进行讲解：

可用BadgerView构造：

1.public BadgeView(Context context, View target)；

2.BadgeView(Context context, TabWidget target, int index)；

3.public BadgeView(Context context, AttributeSet attrs, int defStyle, View target, int tabIndex)；

构造1最基本的是传入上下文对象和附着view,从而构造badger view

构造2传入的tabWidget类似在tabhost 的button上加badger的效果，index是指定第几个hostbutton

设置方法：

显示：

public void show()//单纯显示

public void show(boolean animate)//动画为默认的渐入

public void show(Animation anim)//自定义显示动画，例如可以是飞入，旋转渐入等等

隐藏：

public void hide()//单纯隐藏

public void hide(boolean animate)//默认动画渐出

public void hide(Animation anim)//自定义动画

显示隐藏自动切换：

public void toggle()

public void toggle(boolean animate)

public void toggle(Animation animIn, Animation animOut)

计数：

public int increment(int offset)//计数递增，不传offset时默认从0开始递增

public int decrement(int offset)//技术递减，默认从0开始递减

返回附着view对象：

public View getTarget()

返回显示状态：

public boolean isShown()

返回/设置badger在附着view上的位置

public int getBadgePosition()

public void setBadgePosition(int layoutPosition)

获取/设置badger背景颜色

public int getBadgeBackgroundColor()

public void setBadgeBackgroundColor(int badgeColor)

获取/设置外间距

public int getBadgeMargin()

public void setBadgeMargin(int badgeMargin)

源码：

package com.readystatesoftware.viewbadger;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. *  * @author Jeff Gilfelt */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;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.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 badgeMargin;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 defaultsbadgePosition = DEFAULT_POSITION;badgeMargin = dipToPixels(DEFAULT_MARGIN_DIP);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 containertarget = ((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 ViewGroupViewGroup 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);}@SuppressWarnings("deprecation")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(badgeMargin, badgeMargin, 0, 0);break;case POSITION_TOP_RIGHT:lp.gravity = Gravity.RIGHT | Gravity.TOP;lp.setMargins(0, badgeMargin, badgeMargin, 0);break;case POSITION_BOTTOM_LEFT:lp.gravity = Gravity.LEFT | Gravity.BOTTOM;lp.setMargins(badgeMargin, 0, 0, badgeMargin);break;case POSITION_BOTTOM_RIGHT:lp.gravity = Gravity.RIGHT | Gravity.BOTTOM;lp.setMargins(0, 0, badgeMargin, badgeMargin);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?     *      */@Overridepublic boolean isShown() {return isShown;}/**     * Returns the positioning of this badge.     *      * one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT.     *      */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.     *      */public void setBadgePosition(int layoutPosition) {this.badgePosition = layoutPosition;}/**     * Returns the horizontal/vertical margin from the target View that is applied to this badge.     *      */public int getBadgeMargin() {return badgeMargin;}/**     * 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.badgeMargin = badgeMargin;}/**     * 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;}}

不想贴源码，可以直接下载jar包，即放即用地址：

http://download.csdn.net/detail/kangkang_style/9917434