[問題] editText的小問題
我想問一下 我用了很多的EditText來做計算
但是只要有一個沒填上數字程式就會出現錯誤然後關閉
不曉得怎麼樣才能讓他設定成沒輸入數字等於0
或是有辦法提醒說請輸入數子然後不要讓程式直接錯誤關閉嗎..
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