Android App Development 20150507
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This document discusses building a simple Android app with multiple activities. It describes adding a button to the user interface and creating a second activity. It then explains how to code the button's onclick listener to build an intent and start the new activity, allowing navigation between screens in the app.
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14 th Edition of International conference on computer vision
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14th Edition of International conference on computer vision
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What next after learning python programming basics
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Android App Development 20150507
- 1. Android App Development 4 7 May, 2015
- 2. Building a Simple User Interface Add a Button Weight Attribute Exercise1 Last Workshop 2/9 3/9 4/9
- 3. Activity An application component that provides a screen with which users can interact Starting Another Activity
- 4. click
- 5. In java directory, select the package com.mycompany.myfirstapp, right-click Select New > Activity > Blank Activity Create the Second Activity
- 6. Activity Name: DisplayMessageActivity Layout Name: acticity_display_message Title: My Message Hierarchical Parent: com.mycompany.myfirstapp.MyActivity Package name: com.mycompany.myfirstapp Create the Second Activity
- 7. Edit res/layout/activity_display_message.xml Edit res/values/strings.xml Create the Second Activity
- 8. Add “Go Next” Button Create the Second Activity
- 10. LinearLayout (horizontal) Button Text Field Button LinearLayout (vertical) Width = match_parent Height = match_paremt Width = match_parent Height = match_parent wrap_content
- 12. Add “Go Next” Button activity_my.xml LinearLayout (horizontal) Button Text Field Button LinearLayout (vertical) Create the Second Activity
- 13. Edit res/layout/activity_my.xml Add onClick attribute Respond to “Go Next” Button
- 14. Edit MyActivity.java Add the goNextActivity() method Respond to the “Go Next” Button
- 15. 1. Build an Intent Intent An object that provides runtime binding between separate components (such as two activities) 2. Add a startActivity Method goNextActivity() Method ① ② At the top of “MyActivity.java”, import the Intent class Respond to “Go Next” Button When you start a new Activity, you need to build an Intent first.
- 17. Add a New Button LinearLayout (vertical) Starting Another Activity Create the Second Activity goNextActivity() Method Build an Intent Add a startActivity Method Next Workshop Adding Multimedia to your App Wrap Up for Today
- 18. fin.