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MIT App Inventor 2 is web-based environment for creating Android applications. It is similar to Scratch that use visual programming. A google account is needed for using MIT App Inventor 2. Please refer to Getting Started with MIT App Inventor 2 to prepare MIT App Inventor 2 environment.
環境建置好以後，就來拉一些積木來測試吧。
Well done. Let's making a simple project: "Hello"
建立新專案(Start New Project)：
使用滑鼠將Button、Label、TextBox個拖曳一個至網頁上的手機畫面(Screen1)：
Add three user interfaces "Button, Label, TextBox" to display screen(Screen 1):
Add three user interfaces "Button, Label, TextBox" to display screen(Screen 1):
接下來要設計按鈕的程式積木，點選畫面右上方的Blocks按鈕：
Click "Blocks" button to design the code blocks for "Button" user interface:
點選畫面左方的Button1，將when Button1.Click積木拖曳到右方的積木區：
Click "Button1" on the Blocks Component-Specific Drawers. Then, drag the when Button1.Click to Blocks Viewer.
仿照Button1的做法，將程式積木設計為如下：
The code for "Button1" is:
接著就可以使用模擬器來執行看看了：
Run the "Hello" project with a Emulator:
若不清楚如何執行App，請參考第三章 App Inventor 程式編譯與執行。Click "Blocks" button to design the code blocks for "Button" user interface:
點選畫面左方的Button1，將when Button1.Click積木拖曳到右方的積木區：
Click "Button1" on the Blocks Component-Specific Drawers. Then, drag the when Button1.Click to Blocks Viewer.
仿照Button1的做法，將程式積木設計為如下：
The code for "Button1" is:
接著就可以使用模擬器來執行看看了：
Run the "Hello" project with a Emulator:
Please go to Setting Up App Inventor if you need any help.
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