how to create database for android app

Android database creation and android database creation Main java Package com. itheima. createdatabase; import android. app. activity; import android. content. context; import

1. Why do I need to sign the Android app? If you can only answer this question in a simple sentence, I will say, "This is what the Android system requires." Android requires every Android app to be digitally signed to install into

Label:1. For the convenience of database query problem, can establish important table log backup record table, add in Main table, modify, delete add trigger, modify trigger to increase trigger field point, limit condition.The database log table is more convenient than downloading log files from multiple servers on the line, but the focus of the two is different.2. Error code: 1118Row size too large. The max

Original address: http://dong2008hong.blog.163.com/blog/static/4696882720140441353482/Seems like the using a simple Android JAR files inside a Unity Android project are not such a simple thing to do. I finally managed to get the ADMOB working in an existing Unity Android game. For this example I is using Unity for Windows version 3.5.2 and the latest

activity creation process is actually going through a series framework of layers of operation, in the daily development, we will go to rewrite the Application class, and then in the Application initialization of some operations, such as the static user identification TOKEN , the initialization of Third-party SDK and so on. Here are a few suggestions: 1, do not let Application participate in the operation of the business 2, do not APPlication take time-consuming operations, such as some devel

If you want Google Play to do one of the most unsuccessful cases, then the best secret is the interface is extremely slow, power consumption, memory consumption. Then you get negative comments from the user, and then the reputation stinks. Even if your application is well designed and creative, it's useless.Every problem that affects product efficiency, such as power consumption or memory footprint, can affect the success of your app. That's why it's

Note: This blog post is reproduced in Http://my.oschina.net/mengshuai/blog/541314?fromerr=z8tDxWUHThis article describes the author of the article in the development of Android applications for several years, experienced 2 architectural changes, the first integration of the Rxjava second integration of the MVP, and the Rxjava with the MVP perfect combination, achieve a low-coupling, code simple, testing a convenient architecture.In fact, we also encou

After completing the previous lesson (creating a simple user interface), we already have an app (app) that shows an activity (an interface) that contains a text field and a button. In this lesson, we will add some new code to the MyActivity start of a new activity when the user clicks the Send button.Response Send button1 Open the Content_my.xml file in the Res/layout directory in

Android developers recently announced a new Multidex support library on Google +, providing official support for Android apps with a total of over 65K.If you're a lucky Android app developer and you're developing a promising app that's constantly adding new features and addi

properly and not upload it to the repository or anywhere else. 2-: Set gradle variablePut the my-release-key.keystore file under the Android/app folder in your project.Edit ~/.gradle/gradle.properties(without this file you create one), add the following code (note that the * * is replaced with the corresponding password)Note: ~ Represents a user directory, suc

packages you develop are vulnerable to hacker attacks, a two-minute event, you can clearly know the security risks and vulnerabilities of the APK, and finally a detailed report can be generated. Then, according to these vulnerabilities and then do the corresponding encryption protection measures! Don't worry, different applications have different solutions, learn more about the mouth:http://www.ijiami.cn/appprotect_mobile_games 9. Abide by the platform guiding principle while your goal is to

understand faster.1, create a new project Lesson35_helloappwidget, note that creation Activity may not be selected when creating.2, ready a widget display layout file Layout/widget.xml, the content is as follows:xml/html Code XML version= "1.0" encoding="Utf-8"?> linearlayoutandroid:layout_ Height= "fill_parent" android:layout_width= "fill_parent" android:orientation= "vertical" xmlns:android= "http://schemas.android.com/apk/res/

Sencha Study Notes 2: package your first Sencha Android app apk installation package, senchaapk We have a preliminary impression on sencha through the introduction in the previous translation official Article. At the same time, we also generated the first sample application code framework through this wizard, many people may think that the next step should be based on the detailed information prompted by th

input to call the PC Input Method , you can also adjust the resolution arbitrarily:2. Run on Android x86 system:First download Android x86 system (project website download),Currently the latest version is (as of 2014/10/02):android-x86 4.4-r1 (kitkat-x86)I installed in VMware, but can not change the resolution, it is recommended to install with VirtualBox, you c

operations are all performed in CMD5. Create an AppUse CD e:\test\ in cmdThen e:This allows us to enter a new path for creating an app. Run under this pathCordova Create Hello Com.example.hello HelloWorldCreate after the three can be casually written, where the first is to create a folder name, cannot be Chinese, the

clone the volley source code:git clone Https://android.googlesource.com/platform/frameworks/volleyUnfortunately, the volley library's source Android is not hosted on its GitHub account, so it can only be cloned on the Googlesource, of course, in the country will need to FQ first.For volley source structure:After cloning successful, you can easily use ant to compile, of course, if it is under the full Android