限制輸入小數點兩位

需要對輸入框設定鍵盤型別 inputType:number_decimal

		bank_card_pay_balance.addTextChangedListener(new TextWatcher() {
			boolean deleteLastChar;//是否需要刪除末尾
			@Override
			public void onTextChanged(CharSequence s, int start, int before, int count) {
				if(s.toString().contains(".")){
					//如果點後面有超過三位數值,則刪掉最後一位
					int length=s.length()-s.toString().lastIndexOf(".");
					if(length>=4){//說明後面有三位數值
						deleteLastChar=true;
					}else{
						deleteLastChar=false;
					}
				}
			}
			@Override
			public void beforeTextChanged(CharSequence s, int start, int count,int after) {
				
			}
			@Override
			public void afterTextChanged(Editable s) {
				if(deleteLastChar){
					//設定新的擷取的字串
					bank_card_pay_balance.setText(s.toString().substring(0, s.toString().length()-1));
					//游標強制到末尾
					bank_card_pay_balance.setSelection(bank_card_pay_balance.getText().length());
				}
			}
		});