怎么在Android应用中添加一个未读消息提示功能

public class LauncherBadgeHelper {  public static void setBadgeCount(Context context, int count) {  if (count <= 0) {   count = 0;  } else {   count = Math.max(0, Math.min(count, 99));  }  if (Build.MANUFACTURER.equalsIgnoreCase("Xiaomi")) {   sendToXiaoMi(context, count);  } else if (Build.MANUFACTURER.equalsIgnoreCase("sony")) {   sendToSony(context, count);  } else if (Build.MANUFACTURER.toLowerCase().contains("samsung")) {   sendToSamsumg(context, count);  } else {   sendToSamsumg(context, count);  } }  private static void sendToXiaoMi(Context context, int count) {  try {   Class miuiNotificationClass = Class.forName("android.app.MiuiNotification");   Object miuiNotification = miuiNotificationClass.newInstance();   Field field = miuiNotification.getClass().getDeclaredField("messageCount");   field.setAccessible(true);   field.set(miuiNotification, String.valueOf(count == 0 &#63; "" : count)); // 设置信息数-->这种发送必须是miui 6才行  } catch (Exception e) {   LogController.e(e.toString());   // miui 6之前的版本   Intent localIntent = new Intent(     "android.intent.action.APPLICATION_MESSAGE_UPDATE");   localIntent.putExtra(     "android.intent.extra.update_application_component_name",     context.getPackageName() + "/" + getLauncherClassName(context));   localIntent.putExtra(     "android.intent.extra.update_application_message_text", String.valueOf(count == 0 &#63; "" : count));   context.sendBroadcast(localIntent);  } }  private static void sendToSony(Context context, int count) {  String launcherClassName = getLauncherClassName(context);  if (launcherClassName == null) {   return;  }  boolean isShow = true;  if (count == 0) {   isShow = false;  }  Intent localIntent = new Intent();  localIntent.setAction("com.sonyericsson.home.action.UPDATE_BADGE");  localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.SHOW_MESSAGE", isShow);//是否显示  localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.ACTIVITY_NAME", launcherClassName);//启动页  localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.MESSAGE", String.valueOf(count));//数字  localIntent.putExtra("com.sonyericsson.home.intent.extra.badge.PACKAGE_NAME", context.getPackageName());//包名  context.sendBroadcast(localIntent); }  private static void sendToSamsumg(Context context, int count) {  String launcherClassName = getLauncherClassName(context);  if (launcherClassName == null) {   return;  }  Intent intent = new Intent("android.intent.action.BADGE_COUNT_UPDATE");  intent.putExtra("badge_count", count);  intent.putExtra("badge_count_package_name", context.getPackageName());  intent.putExtra("badge_count_class_name", launcherClassName);  context.sendBroadcast(intent); }  public static void resetBadgeCount(Context context) {  setBadgeCount(context, 0); }  private static String getLauncherClassName(Context context) {  PackageManager packageManager = context.getPackageManager();  Intent intent = new Intent(Intent.ACTION_MAIN);  // To limit the components this Intent will resolve to, by setting an  // explicit package name.  intent.setPackage(context.getPackageName());  intent.addCategory(Intent.CATEGORY_LAUNCHER);  // All Application must have 1 Activity at least.  // Launcher activity must be found!  ResolveInfo info = packageManager    .resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);  // get a ResolveInfo containing ACTION_MAIN, CATEGORY_LAUNCHER  // if there is no Activity which has filtered by CATEGORY_DEFAULT  if (info == null) {   info = packageManager.resolveActivity(intent, 0);  }  return info.activityInfo.name; }}</uses-permission>