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我不知道如何在我的代码中正确实现TextUtils。我正在构建一个计算器,但不知道应该如何实施?这可能是一个小小的修复,但不能确定。提前致谢!TextUtils如何实现?
继承人我的代码:
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;
//问题就在这里
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);
}
}
是什么按钮?在第一个代码块中,你正在实例化它的两个版本,一个数组和一个浮点数。你的代码有点混乱,因为你反复使用同一个名字(按钮),很难理解应该发生什么。 – Zamereon 2015-04-05 03:01:37
你在检查'TextView' scr或'Button'按钮上的空白吗?为什么你不只是去'Whateverview.getText()。的toString()。的isEmpty()'或'Whateverview.getText()。的toString()。长度()== 0' – Elltz 2015-04-05 03:01:45
嘿@Elltz我检查按钮按钮的空白。我尝试了“Whateverview.getText()。toString()。isEmpty()或Whateverview.getText()。toString()。length()== 0”然后说不能解析符号“getText”我只想要所有的按钮在数组中具有功能。 – 2015-04-05 03:53:28