NotificationListenerService失效的两种情况

1、在NotificationListenerService onCreate或Onbind过程中crash。这种情况只能重启手机，即使修改了crash部分的代码重新安装程序也一样不能收到通知。原因是NLS在registerListenerService时会有一个tag标记（可能是为了防止一个service多次启动）bind前会加tag,bind成功结束后会去掉tag。那么在bind时cash标签不会去掉，就导致NLS无效，即使想重新注册，因为有一个tag存在，也会直接return。

private void registerListenerService(final ComponentName name, final int userid) {
//servicesBindingTag可以理解为需要启动的service的标签
final String servicesBindingTag = name.toString() + "/" + userid;
//如果mServicesBinding中已经包含正在处理的service则直接return退出
if (mServicesBinding.contains(servicesBindingTag)) {
// stop registering this thing already! we're working on it
return;
}
//将准备启动的service标签添加到mServicesBinding中
mServicesBinding.add(servicesBindingTag);

//... ...省略
//使用bindServiceAsUser启动service
Intent intent = new Intent(NotificationListenerService.SERVICE_INTERFACE);
intent.setComponent(name);

intent.putExtra(Intent.EXTRA_CLIENT_LABEL,
R.string.notification_listener_binding_label);
intent.putExtra(Intent.EXTRA_CLIENT_INTENT, PendingIntent.getActivity(
mContext, 0, new Intent(Settings.ACTION_NOTIFICATION_LISTENER_SETTINGS), 0));

try {
if (DBG) Slog.v(TAG, "binding: " + intent);
if (!mContext.bindServiceAsUser(intent,
new ServiceConnection() {
INotificationListener mListener;
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
synchronized (mNotificationList) {
//服务成功启动之后删除标签
mServicesBinding.remove(servicesBindingTag);
try {
mListener = INotificationListener.Stub.asInterface(service);
NotificationListenerInfo info = new NotificationListenerInfo(
mListener, name, userid, this);
service.linkToDeath(info, 0);
mListeners.add(info);
} catch (RemoteException e) {
// already dead
}
}
}

@Override
public void onServiceDisconnected(ComponentName name) {
Slog.v(TAG, "notification listener connection lost: " + name);
}
},
Context.BIND_AUTO_CREATE,
new UserHandle(userid)))
{
//绑定服务失败后删除标签
mServicesBinding.remove(servicesBindingTag);
Slog.w(TAG, "Unable to bind listener service: " + intent);
return;
}
} catch (SecurityException ex) {
Slog.e(TAG, "Unable to bind listener service: " + intent, ex);
return;
}
}
}

2、被第三方软件杀掉或者service被系统杀掉，可以通过重新绑定服务使NLS重新生效。可以通过adb shell dumpsys notification命令查看手机里enable和live的notificationlistener。如果live里没有说明你的服务没有存活，也就是NLS的无效。可以通过一个函数来重新绑定：

public static void toggleNotificationListenerService(Context context) {
Log.e(TAG,"toggleNLS");
PackageManager pm = context.getPackageManager();
pm.setComponentEnabledSetting(
new ComponentName(context, com.zhenglei.launcher_test.qianghongbao.NotificationService.class),
PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);

pm.setComponentEnabledSetting(
new ComponentName(context, com.zhenglei.launcher_test.qianghongbao.NotificationService.class),
PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
}

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本文只做整理