红色小圆点消息提示之BadgeView

textView1 = (TextView) findViewById(R.id.textView1);
textView2 = (TextView) findViewById(R.id.textView2);
imageView = (ImageView) findViewById(R.id.imageView);

//初始化BadgeView，1.上下文，2.显示对象
final BadgeView badgeTextView1 = new BadgeView(this, textView1);
BadgeView badgeTextView2 = new BadgeView(this, textView2);
BadgeView badgeImageView = new BadgeView(this, imageView);

badgeTextView1.setBadgeBackgroundColor(Color.RED);//设置背景颜色
badgeTextView1.setBadgeMargin(5);//设置margin
badgeTextView1.setBadgePosition(BadgeView.POSITION_TOP_RIGHT);//设置显示的位置

count = 1;
        if (count > 0) {
            if (count < 99) {
                badgeTextView1.setText(count + "");//设置显示的内容
            } else {
                badgeTextView1.setText("99+");
            }
            badgeTextView1.setTextSize(10);//设置字体大小
            badgeTextView1.setTextColor(Color.WHITE);//设置字体颜色
            badgeTextView1.show();//显示
        } else {
            badgeTextView1.hide();//隐藏
        }
6.设置点击（强迫症的必须点击消失。。。）
//设置点击
        badgeTextView1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 1
                // 设置进入的移动动画，设置了插值器，可以实现颤动的效果
                TranslateAnimation anim1 = new TranslateAnimation(0, 0, 0, 0);
                anim1.setInterpolator(new BounceInterpolator());
                // 设置动画的持续时间
                anim1.setDuration(500);
                // 设置退出的移动动画
                TranslateAnimation anim2 = new TranslateAnimation(0, 0, 0, 0);
                anim2.setDuration(500);
                badgeTextView1.toggle(anim1, anim2);
                // 2
                //badgeTextView1.toggle(true);
                // 3
                //badgeTextView1.hide();
            }
        });
7.BadgeView
可copy直接用，再加一个attrs.xml文件
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="CircleImageView">
        <attr name="border_width" format="dimension"/>
        <attr name="border_color" format="color"/>
    </declare-styleable>
</resources>
package com.yechaoa.badgeviewdemo;
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 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;
  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 -
     * 
     * create a new BadgeView instance attached to a target {@link 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 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
  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;
  }
}