How do I write pinyin with tones on samsung keyboard?

I know that I can write with numbers ni3 hao3 but i would like to use the actual accent/ tone mark. However the keyboard does not have the 3rd tone for most letters and some other tones are missing I į ī ï î í ì ôõ. 

Also I already have a pinyin keyboard 你好 but that inputs Chinese characters 汉字。

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