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【转】用App Inventor 2实现电子围栏功能 - App应用开发 - 清泛IT社区，为创新赋能！
在行空板《家庭安全相册》项目中，第四部分是手机APP监护人部分。这部分需要完成手机获取家庭成员传送回来的位置后，计算是否在安全的电子围栏范围内。因为电子围栏是相对复杂的部分，因此独立一章详细说明。
App In...
How can I add the new “Floating Action Button” between two widgets/layouts
...t
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_heigh...
Android activity life cycle - what are all these methods for?
... The final call you receive before your activity is destroyed. This
can happen either because the activity is finishing (someone called
finish() on it, or because the system is temporarily destroying this
instance of the activity to save space. You can distinguish between> these two scenari...
If table exists drop table then create it, if it does not exist just create it
... Oct 10 '15 at 16:26
Junior Mayhé
14.8k2626 gold badges102102 silver badges154154 bronze badges
answered Nov 22 '13 at 22:55
...
Diff output from two programs without temporary files
... come with the vim package on most systems.
– Tim Visée
Feb 6 '17 at 2:42
vimdiff also shows not only the line that d...
angular js unknown provider
...will be helpful. What I'm suspecting is that you are not initializing your app with the 'productServices' module. It would give the same error, we can see this in another jsFiddle: http://jsfiddle.net/a69nX/1/
If you are planning to work with AngularJS and MongoLab I would suggest using an existing...
How to organize large R programs?
...ons quick, easy and kinda organized :-)
– Antoine Lizée
Aug 15 '13 at 18:22
5
Just saw this toda...
How do I manage MongoDB connections in a Node.js web application?
...de-mongodb-native says:
You open do MongoClient.connect once when your app boots up and reuse
the db object. It's not a singleton connection pool each .connect
creates a new connection pool.
So, to answer your question directly, reuse the db object that results from MongoClient.connect(). ...
Is there a way to get a collection of all the Models in your Rails app?
...ere a way that you can get a collection of all of the Models in your Rails app?
28 Answers
...
Can an AngularJS controller inherit from another controller in the same module?
...o use the $controller service to instantiate the controller instead:-
var app = angular.module('angularjs-starter', []);
app.controller('ParentCtrl', function($scope) {
// I'm the sibling, but want to act as parent
});
app.controller('ChildCtrl', function($scope, $controller) {
$controller('P...