Recent Notes

Displaying keyword search results 71 - 80
Created by freyo on May 09, 2011 14:15:01    Last update: May 09, 2011 14:17:22
In short, use the PackageManager class to get the PackageInfo : PackageInfo pkgInfo = getPackageManager().getP... To build an APK, make these changes to the greetings app : Change the layout to ( res/layout/main.xml ): <?xml version="1.0" encoding="utf-8"?> <LinearL... Change the string values ( res/values/strings.xml ): <?xml version="1.0" encoding="utf-8"?> <resourc... Update AndroidManifest.xml : <?xml version="1.0" encoding="utf-8"?> <manifes... Create a new Java class src/com/android/appinfo/GetAppVersion.java : package com.android.appinfo; import android... Edit build.xml , change project name to "AppInfo": <?xml version="1.0" encoding="UTF-8"?> <project... Install to emulator: ant install Screenshot:
Created by freyo on May 05, 2011 09:33:55    Last update: May 05, 2011 09:34:46
For Android, there's no entry function like " public static void main() " in Java. The main activity is declared by intent-filter in AndroidManifest.xml : <intent-filter> <action android:name="andro... The category LAUNCHER declaration puts it in the Launcher . The action MAIN means this is the activity to start when the application icon is clicked in the Launcher. In fact, the Android ActivityManager starts the main activity with the intent: { act=android.intent.action.MAIN cat=[android.inte...
Created by freyo on May 05, 2011 09:00:36    Last update: May 05, 2011 09:07:27
This example uses an Intent with Uri scheme tel: to invoke the phone dialer. Create a new project with: $ ~/android-sdk-linux_86/tools/android create proj... Update the layout res/layout/main.xml to add a text field and a button: <?xml version="1.0" encoding="utf-8"?> <LinearL... Update the Java class src/com/android/intenttest/CallPhone.java to handle button click and start the built-in phone dialer with Intent : package com.android.intenttest; import andr... Update AndroidManifest.xml to add CALL_PHONE permission: <?xml version="1.0" encoding="utf-8"?> <manifes... Install to the emulator and test: ant install The phone dialer will be invoked when you click the "Call" button. So how did this happen? The CallPhone activity creates an Intent with action Intent.ACTION_CALL and Uri tel:<a number> and sends it off to Android. Android starts the activity com.android.phone.OutgoingCallBroadcaster because the intent matches the...
Created by freyo on May 04, 2011 14:22:39    Last update: May 04, 2011 14:23:11
The attribute android:name when used with <activity> , <provider> , <service> or <receiver> , identifies a Java class that implements the component. It can be: a fully qualified class name, e.g., com.example.project.ReportReceiver . or a shorthand notation starting with a dot, e.g., .ReportReceiver , in which case, the name of the package specified in <manifest> is prepended to it to get the full class name. However, shorthand notation without the leading dot seemed to work also.
Created by freyo on April 12, 2011 15:13:32    Last update: May 03, 2011 15:20:55
Create new project $ tools/android create project \ > --package co... Edit res/values/string.xml , add strings for the main screen. <?xml version="1.0" encoding="utf-8"?> <resourc... Add widgets to main layout ( res/layout/main.xml ). <?xml version="1.0" encoding="utf-8"?> <LinearL... Edit src/com/android/apkinfo/GetAPKPermissions.java and change contents to: package com.android.apkinfo; import android... Install the debug package to the emulator: ant install The screen should look like: Add display permissions activity. Start by creating a new layout res/layout/display_permissions.xml : <?xml version="1.0" encoding="utf-8"?> <LinearL... Add the strings used by the new Activity ( res/values/strings.xml ): <?xml version="1.0" encoding="utf-8"?> <resourc... Add the Display Permissions Activity ( src/com/android/apkinfo/DisplayPermissions.java ): package com.android.apkinfo; import android... Change src/com/android/apkinfo/GetAPKPermissions.java to invoke the Display Permissions Activity: package com.android.apkinfo; import android... Declare Display Permissions Activity in AndroidManifest.xml : <?xml version="1.0" encoding="utf-8"?> <manifes......
Created by Dr. Xi on April 26, 2011 20:12:01    Last update: April 28, 2011 15:28:12
An XML schema is a definition of XML files, in XML. It plays the same role as old-time DTDs. Overall, an XML schema file looks like this: <schema attributeFormDefault = (qualified | u... The attribute meanings: targetNamespace : The name space targeted by the current schema definition. It can be any URI. id and version : For user convenience, the W3C spec defines no semantics for them. xml:lang : Natural language identifier defined by RFC 3306 . attributeFormDefault and elementFormDefault : Set default values for the form attribute for attribute and element declarations. blockDefault and finalDefault : Set default values for the block and final attributes for attribute and element declarations. The W3C defined some built-in datatypes . Examples of primitive datatypes are: string ,...
Created by Dr. Xi on April 27, 2011 11:26:54    Last update: April 27, 2011 11:27:13
With DTD: DocumentBuilderFactory df = DocumentBuilderFactory... With Schema: // Create schema SchemaFactory xsdFactory = Sch... With Relax NG: // Create schema SchemaFactory xsdFactory = Sch...
Created by Dr. Xi on April 26, 2011 21:25:55    Last update: April 27, 2011 11:08:57
The following code validates a web.xml file against the web-app 2.5 schema: // Java XML validation with schema import java.... web.xml used for testing: <?xml version="1.0" encoding="UTF-8"?> <web-ap... According to Java API doc , validation can also be done while parsing by calling setSchema on the parsing factory. However, validation doesn't work for the SAXParserFactory! // Java XML validation with schema import java....
Created by Dr. Xi on April 27, 2011 08:28:31    Last update: April 27, 2011 08:37:40
JBoss example with hsql: <persistence> <persistence-unit name="myapp"... MySQL example with JDBC : <persistence xmlns="http://java.sun.com/xml... With OpenEJB transaction manager: <persistence version="1.0" xmlns="... With EclipseLink : <?xml version="1.0" encoding="UTF-8"?> <persist...
Created by freyo on April 21, 2011 11:08:05    Last update: April 21, 2011 11:08:05
In Android string resources, you can define a format string with placeholders instead of a static string, then use String.format() to render the string with runtime variable substitutions. For example ( res/values/strings.xml ): <?xml version="1.0" encoding="utf-8"?> <resourc... In Java code: String packageName = String.format(getString(R.str...
Previous  3 4 5 6 7 8 9 10 11 12 Next