App Inventor Code Snippets 研究

App Inventor Code Snippets

網址：http://puravidaapps.com/snippets.php

Canvas

• How to save a canvas

• How to create a Scratchcard with App Inventor

• How to Swipe left/right and top/bottom to trigger something

• How to change background image without changing drawn lines

Web Viewer and App Inventor

• How to read a HTML page stored as asset inside of App Inventor

  • development path: file:///mnt/sdcard/AppInventor/assets/<檔名>.html

  • production path: file:///android_asset/<檔名>.html

• App Inventor and animated gifs

  • development path: file:///mnt/sdcard/AppInventor/assets/<檔名>.gif

  • production path: file:///android_asset/<檔名>.gif

• How does the property Webviewer.WebViewString work?

與網頁交換字串：

webviewstring.html

• How to sort a list using the webviewer(!)

以 javascript 排序：

• How to get the max value within a list of numbers

以網頁中 javascript 計算最大值：

max.html

Activity Starter

• How to launch Google Play from within your app

啟動 QuickMark APP：

• How to add a contact to the contact list

• How to send an eMail

• How to launch Waze to look for a specified location

啟動 Waze APP，若未安裝，詢問是否安裝，若回答「確定」，則至 Play 商店安裝此 APP：

• How to view a pdf document

• How to pick an image using the activity starter

• How to use Activity Starter to view a Youtube video in full screen

• How to start a Skype call

• How to enable Bluetooth (User still needs to confirm)

• How to start OsmAnd

• How to copy text to the Clipboard

• How to start Whatsapp/send a message with Whatsapp

• How to execute statements in the Jackpal Terminal Emulator

Other Stuff

• How to build a simple compass app with App Inventor

• An enhancement to the compass app to provide additionally the direction to a waypoint

• How to trigger something if device is facing down

• How to create a nested listpicker

• How to get a date in format YYYY-MM-DD

• How to get leading zeros in App Inventor

• How to get the day of year

• How to parse a result

• How to use the Sound Recorder

• New formatting possibilities with the Notifier

• New formatting possibilities with the Label

• How to play a random sound when the device is shaken

• How does the lookup in pairs block work?

• How to pick a random item from a list without picking duplicates?

• How to take a picture or pick an image and share it

• A workaround for the decimal separator problem

• How to get european or chinese characters from Web ResponseContent

• How to use the YandexTranslate component

• How to read a file stored as asset in App Inventor

• How to keep the screen on

• How to create a directory