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我不知道如何在我的代碼中正確實現TextUtils。我正在構建一個計算器,但不知道應該如何實施?這可能是一個小小的修復,但不能確定。提前致謝!TextUtils如何實現?
繼承人我的代碼:
package com.mula.minicalculator;
import android.text.TextUtils;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Button;
import static com.mula.minicalculator.R.id;
public class MainActivity extends ActionBarActivity implements View.OnClickListener {
TextView scr;
Button buttonPlus;
Button buttonSub;
Button buttonX;
Button buttonDiv;
String oper = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
scr = (TextView) findViewById(id.answerSum);
// Elements
buttonDiv = (Button) findViewById(id.buttonDiv);
buttonX = (Button) findViewById(id.buttonX);
buttonSub = (Button) findViewById(id.buttonSub);
buttonPlus = (Button) findViewById(id.buttonPlus);
// Set a Listener
buttonDiv.setOnClickListener(this);
buttonSub.setOnClickListener(this);
buttonX.setOnClickListener(this);
buttonPlus.setOnClickListener(this);
// Now the numbers
Button buttons[] = new Button[10];
buttons[0] = (Button) findViewById(id.button0);
buttons[1] = (Button) findViewById(id.button1);
buttons[2] = (Button) findViewById(id.button2);
buttons[3] = (Button) findViewById(id.button3);
buttons[4] = (Button) findViewById(id.button4);
buttons[5] = (Button) findViewById(id.button5);
buttons[6] = (Button) findViewById(id.button6);
buttons[7] = (Button) findViewById(id.button7);
buttons[8] = (Button) findViewById(id.button8);
buttons[9] = (Button) findViewById(id.button9);
}
@Override
public void onClick(View view) {
float buttons = 0;
float result = 0;
//問題就在這裏
if (TextUtils.isEmpty(buttons.getText().toString()) {
return;
}
return;
switch (view.getId()) {
case id.buttonPlus:
oper = "+";
result = buttons + buttons;
break;
case id.buttonSub:
oper = "-";
result = buttons - buttons;
break;
case id.buttonX:
oper = "*";
result = buttons * buttons;
break;
case id.buttonDiv:
oper = "/";
result = buttons/buttons;
break;
default:
break;
}
scr.setText(buttons + " " + oper + " " + buttons + " = " + result);
}
}
是什麼按鈕?在第一個代碼塊中,你正在實例化它的兩個版本,一個數組和一個浮點數。你的代碼有點混亂,因爲你反覆使用同一個名字(按鈕),很難理解應該發生什麼。 – Zamereon 2015-04-05 03:01:37
你在檢查'TextView' scr或'Button'按鈕上的空白嗎?爲什麼你不只是去'Whateverview.getText()。的toString()。的isEmpty()'或'Whateverview.getText()。的toString()。長度()== 0' – Elltz 2015-04-05 03:01:45
嘿@Elltz我檢查按鈕按鈕的空白。我嘗試了「Whateverview.getText()。toString()。isEmpty()或Whateverview.getText()。toString()。length()== 0」然後說不能解析符號「getText」我只想要所有的按鈕在數組中具有功能。 – 2015-04-05 03:53:28