how to create database for android app

Previous "Android" read all the pictures on the SDcard card and show that the reading process has a progress bar display (click the Open link) test on the real machine is very problematic, often encountered memory overflow, the situation of the card dead. Because of the memory on the real machine now, 2G has rarely seen, basically all 8G look like. This app is unfriendly because it puts the read-out image o

**/public class ViewPageAdapter extends PagerAdapter {List 2. Create SwitchViewDemoActivity. java: Package com. genius. demo; import android. app. activity; import android. OS. bundle; import android. view. view; import android.

(filename);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.connect();int len = conn.getContentLength();InputStream is = conn.getInputStream();byte[] by = new byte[len];is.read(by);str = new String(by, "UTF-8");return str;}catch (MalformedURLException e){// TODO Auto-generated catch blocke.printStackTrace();return "";}catch (IOException e){// TODO Auto-generated catch blocke.printStackTrace();return "";}}} Updateapplication class: Package COM. tutor. config; import

the front-end applications Make sure that the service life cycle is short, because each process requires 2 MB of memory, and the front-end program restarts when the memory is required; Keep the memory usage not too large; If you want to update the application every 30 minutes, perform this operation when the device is in the wake-up status; The Service status in pull or sleep is poor, Which is why AlarmManager or the attribute stopSelf () should be used at the end of the Service. Recommend

1. receive broadcasts from appwidget1) register a new intent-filter for appwidgetprovider in androidmanifest. xml.2) use the getbroadcast () method to create a pendingintent3) register a processor for the controls in the appwidget.4) receive broadcast messages in the onreceive () method2. Update the status of controls in the appwidget.Note: Because the appwidget and the main program are not in the same process, you cannot use a common method for opera

A good application software requires good maintenance. From the initial publication to the final product, this process requires constant updates of the version. So how can users get the latest application installation package immediately? Therefore, we need to upgrade the module from the first version. The implementation principle of the automatic update function is that we negotiate an interface with the background in advance. We access this interface in the main Activity of the application. If

Android API Guides web app ------------ Building Web Apps in WebView (WebView and page binding) If you want to implement a web app on your mobile phone or load a web page in the app, you need to use the WebView control. This WebView class is an extension subclass of the View class. It allows web pages to be displayed a

Customize a pretty practical lock screen app, if you can win the user's approval, replace the system with the lock screen, is definitely a small day live entrance. This time is just a summary of the difficulties in the recent research on the Android platform's lock-screen app development. First, the preface The general principle of the lock screen is very simpl

@color/c8 @color/c9 @string/c1 @string/c2 @string/c3 @string/c4 @string/c5 @string/c6 @string/c7 @string/c8 @stri

.2. Method 2--Add Hardware abstraction LayerSplit the driver into split, part open source in kernel, part not open source in Android frame:Second, for example led Android drive:From here we will see the direction of the entire application framework layer to the underlying drive. First, either way, we need to implement a Linux driver for the upper layer to access the LED resources.It is also the use of JNI t

Androidmanifest.xml file to the Apptheme defined above. The immersive status bar can be implemented.Then the detailed settings for theme and toolbar refer to my other two blog posts:Http://www.cnblogs.com/Jude95/p/4369816.htmlHttp://www.cnblogs.com/Jude95/p/4370176.html3. Dependent libraries and SDKsRequired libraries:Gradle-retrolambda--android lambda expression plug-inFresco--android most cock pictures l

description of the color rather than the definition of the font color, background color, etc. This prevents duplicate definitions of similar colors. And the interface color is not uniform.2. Defining a Theme in Style.xml: Under the Res directory, create a values-v21 directory, and then create a style.xml:Then modify the application theme property in the Androidmanifest.xml file to the Apptheme defined abo

Blogging is a pleasure, if you have to write, share with others, is another kind of happiness, if you have a stage show, blog Park is such a stage.This article is an essential knowledge of Android developers, which I have specially organized and summarized for you, not perfect, but useful.1. The meaning of the signatureIn order to guarantee the legal ID of each application developer, to prevent some of the open vendors from possibly confusing the inst

The example in this article describes the Android implementation of the automatic start service or app. Share to everyone for your reference, specific as follows: Step One: First create a broadcast receiver, refactor its abstract method OnReceive (context, Intent Intent), in which you start the service or app you want

Android special effect album (8)-implement the special effects of heart bubbles and dancing, so that your APP can be instantly refreshedAndroid special effect album (8)-implement the special effects of heart bubbles and dancing, so that your APP can be instantly refreshed The Annual leave will also be put soon. It is estimated that there will be no Internet ac

Android app architecture design 01, androidapp1: This article has been excerpted, 12345 -Consistency of requirements, designs, and codes during development-the entire program has a uniform style, such as a dialog box style, button style, tone, and other UI elements-the specific and unified structure of the entire program, for example, when different modules access the network, their calling met

Get Android AD Management Libraryto display ads in the mobile app, you need to add an ad management library in the app, the current version of the Keymob AD Management library is 20150801 downloads to see the Android project directory structure, most of the regular Android e

example, I have a button to load a list of blogs that the activity will call in the listener of the Click eventpresenter.loadTodayPosts( ) If you want to see a complete example of working with the MVP basic architecture, you can check out our Android boilerplate project from GitHub. You can also read more about it here. Architecture Guidance for Ribot Why is this architecture better? Activity and fragment become very lightweigh

package in the future will be the execution result of your entry class; After configuration, click Finish to generate the JAR file of the project. The blog post only targets Java projects. For Android projects, we can also generate static jar files using the above methods.Use of static jar plug-ins After creating the static jar plug-in above, we generate a jar plug-in named drawcolor. Jar. The following shows how to load the file to the

recommended, with the following steps:First step: Export.The second step: Create the KeyStore keystore, enter the KeyStore export location and password, remember the password, the next use existing KeyStore will be used.Step three: Fill in the KeyStore information, fill in some apk file password, use the term and organizational unit information.Fourth step: Generate a signed apk file, and this is the end.Fifth step: If the next release, use the previ