[1] ArrayAdapter和BaseAdapter
Spinner和ListView都需要用ArrayAdapter<type>餵資料
Gallery和GridView需要先自訂一個adapter(ex. myAdapter)去繼承BaseAdapter然後在餵入資料, 在繼承的時候需要實作的function有getCount(), getItem(), getItemId() 還有 getView()
[2]不同元件對應到的listener
Button -> setOnClickListener
CheckBox -> setOnCheckedChangeListener
RadioGroup(RadioButton) -> setOnCheckedChangeListener
Gallery -> setOnItemSelectedListener
GridView -> setOnItemClickListener
ListView -> setOnItemClickListener
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