Android 給雙ListView組織數據源

需求：現有這樣一套原始數據{「A」,"B","C","D","B","A","B","C","A","B","D","D"}. 要求將此數據組織成爲雙列表形式顯示，即將元素相同的數據分爲一組，即{["A","A","A"],["B","B","B","B"],["C","C"],["D","D","D"]}並將分組後的數據顯示在ListView界面上。（外部ListView顯示每一組，內部List

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