Android通知应用

1、使用高德定位开启后台定位

1.1创建通知

@SuppressLint("NewApi")
private Notification buildNotification() {
Notification.Builder builder = null;
Notification notification = null;
if (android.os.Build.VERSION.SDK_INT >= 26) {
//Android O上对Notification进行了修改，如果设置的targetSDKVersion>=26建议使用此种方式创建通知栏
if (null == notificationManager) {
notificationManager = (NotificationManager) BaseApplication.getInstance().getSystemService(Context.NOTIFICATION_SERVICE);
}
String channelId = BaseApplication.getInstance().getPackageName();
if (!isCreateChannel) {
NotificationChannel notificationChannel = new NotificationChannel(channelId,
NOTIFICATION_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
notificationChannel.enableLights(false);//是否在桌面icon右上角展示小圆点
notificationChannel.setLightColor(Color.BLUE); //小圆点颜色
/**是否显示桌面角标，默认显示*/
notificationChannel.setShowBadge(false);
/** 设置通知出现时声音，默认通知是有声音的*/
notificationChannel.setSound(null, null);
// 设置通知出现时的震动（如果 android 设备支持的话）
notificationChannel.enableVibration(false);
notificationManager.createNotificationChannel(notificationChannel);
isCreateChannel = true;
}
builder = new Notification.Builder(BaseApplication.getInstance(), channelId);
} else {
builder = new Notification.Builder(BaseApplication.getInstance());
}
builder.setSmallIcon(R.drawable.app_logo)
.setContentTitle("title")
.setContentText("正在后台运行")
.setWhen(System.currentTimeMillis());
if (android.os.Build.VERSION.SDK_INT >= 16) {
notification = builder.build();
} else {
return builder.getNotification();
}
return notification;
}

注意在三星手机8.0上notificationChannel.setShowBadge(true);时，应用退出到后台会在应用桌面生成带数字1角标，不设置notificationChannel.setSound(null, null);的话，推出到后台有默认声音和震动，影响用户体验；

1.2、通过调用高德api 启动后台定位功能

client.enableBackgroundLocation(2001, buildNotification());

2、通知的基本使用

2.1如果是Android o以上系统，需要使用通知渠道，代码如下：

NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
String title = "消息提示";
String desc = "您有" + num + "条未读消息";
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
String channelId = "default";
String channelName = "默认通知";
NotificationChannel channel = new NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_HIGH);
channel.setShowBadge(true);
notificationManager.createNotificationChannel(channel);
}

2.2创建通知对象：

Notification notification = new NotificationCompat.Builder(context, "default")
.setContentTitle(title)
.setContentText(desc)
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.mipmap.ic_launcher)
.setAutoCancel(true)
.setChannelId("default")
.setNumber(num)//桌面角标数量
.setBadgeIconType(NotificationCompat.BADGE_ICON_SMALL)
.build();

2.3发送通知

发送通知前，先取消上一次发送的通知，代码如下：

int notificationId =1;
//取消掉上一条通知消息
notificationManager.cancel(notificationId);
notificationManager.notify(notificationId, notification);

3、特别注意（Android o）

当如果创建通知的时候使用了 Builder(Context context, String channelId) 带有channelId的构造方法创建的通知，如下：

new NotificationCompat.Builder(getApplicationContext(),"default")

则发送通知的NotificationManager对象也需要使用channelld指定通知渠道，代码如下：

NotificationChannel channel = new NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_HIGH);
//
channel.setShowBadge(true);
notificationManager.createNotificationChannel(channel);

否则发送的通知不会在通知栏显示，且桌面不显示角标。

当使用Builder(Context context)方法创建的通知,则创建manager对象也可以不用指定channeld,

protected void
setNotification(Notification notification, int notificationId, Context context) {
if (notification != null) {
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
//
String title = "消息提示";
//
String desc = "您有" + 1 + "条未读消息";
//
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
//
String channelId = "default";
//
String channelName = "默认通知";
//
NotificationChannel channel = new NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_HIGH);
//
channel.setShowBadge(true);
//
notificationManager.createNotificationChannel(channel);
//
}
notificationManager.notify(notificationId, notification);
}
}

最后

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