我在Android O操作系统上使用服务类。
我计划在后台使用服务。
Android文档指出
如果你的应用程序的API级别为26或更高,系统会对使用或创建后台服务施加限制,除非应用程序本身在前台。如果应用程序需要创建前台服务,应用程序应该调用startForegroundService()。
如果使用startForegroundService(),服务抛出以下错误。
Context.startForegroundService() did not then call
Service.startForeground()
这有什么问题?
请不要在onCreate()方法中调用任何StartForgroundServices,你必须在onStartCommand()中调用StartForground services,否则你将总是得到ANR,所以请不要在onStartCommand()的主线程中编写复杂的登录;
public class Services extends Service {
private static final String ANDROID_CHANNEL_ID = "com.xxxx.Location.Channel";
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
Notification.Builder builder = new Notification.Builder(this, ANDROID_CHANNEL_ID)
.setContentTitle(getString(R.string.app_name))
.setContentText("SmartTracker Running")
.setAutoCancel(true);
Notification notification = builder.build();
startForeground(1, notification);
Log.e("home_button","home button");
} else {
NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
.setContentTitle(getString(R.string.app_name))
.setContentText("SmartTracker is Running...")
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setAutoCancel(true);
Notification notification = builder.build();
startForeground(1, notification);
Log.e("home_button_value","home_button_value");
}
return super.onStartCommand(intent, flags, startId);
}
}
编辑:小心!start前台函数不能以0作为第一个参数,它将引发异常!这个例子包含错误的函数调用,将0更改为你自己的const,它不能为0或大于Max(Int32)
我在@humazed答案中添加了一些代码。所以没有初始通知。这可能是个变通办法,但对我来说很管用。
@Override
public void onCreate() {
super.onCreate();
if (Build.VERSION.SDK_INT >= 26) {
String CHANNEL_ID = "my_channel_01";
NotificationChannel channel = new NotificationChannel(CHANNEL_ID,
"Channel human readable title",
NotificationManager.IMPORTANCE_DEFAULT);
((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE)).createNotificationChannel(channel);
Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("")
.setContentText("")
.setColor(ContextCompat.getColor(this, R.color.transparentColor))
.setSmallIcon(ContextCompat.getColor(this, R.color.transparentColor)).build();
startForeground(1, notification);
}
}
我在小图标和通知上添加了transparentColor。
它会起作用的。
请不要在onCreate()方法中调用任何StartForgroundServices,你必须在onStartCommand()中调用StartForground services,否则你将总是得到ANR,所以请不要在onStartCommand()的主线程中编写复杂的登录;
public class Services extends Service {
private static final String ANDROID_CHANNEL_ID = "com.xxxx.Location.Channel";
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
Notification.Builder builder = new Notification.Builder(this, ANDROID_CHANNEL_ID)
.setContentTitle(getString(R.string.app_name))
.setContentText("SmartTracker Running")
.setAutoCancel(true);
Notification notification = builder.build();
startForeground(1, notification);
Log.e("home_button","home button");
} else {
NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
.setContentTitle(getString(R.string.app_name))
.setContentText("SmartTracker is Running...")
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setAutoCancel(true);
Notification notification = builder.build();
startForeground(1, notification);
Log.e("home_button_value","home_button_value");
}
return super.onStartCommand(intent, flags, startId);
}
}
编辑:小心!start前台函数不能以0作为第一个参数,它将引发异常!这个例子包含错误的函数调用,将0更改为你自己的const,它不能为0或大于Max(Int32)