Performance Android计算器应用程序在单击没有数字的操作员后崩溃
我在Android上创建了一个计算器，但如果我不输入一个数字，我点击一个操作，我的应用程序就会崩溃，并说“不幸的是，你的应用程序名已经停止”，你能帮我解决这个问题吗？有什么办法捕捉到这个异常吗Performance Android计算器应用程序在单击没有数字的操作员后崩溃,performance,android-layout,android-intent,android-activity,android-fragments,Performance,Android Layout,Android Intent,Android Activity,Android Fragments,我在Android上创建了一个计算器，但如果我不输入一个数字，我点击一个操作，我的应用程序就会崩溃，并说“不幸的是，你的应用程序名已经停止”，你能帮我解决这个问题吗？有什么办法捕捉到这个异常吗 btn1 = (Button) findViewById(R.id.btn1Id); btn2 = (Button) findViewById(R.id.btn2Id); btn3 = (Button) findViewById(R.id.btn3Id); btn4 = (
btn1 = (Button) findViewById(R.id.btn1Id);
btn2 = (Button) findViewById(R.id.btn2Id);
btn3 = (Button) findViewById(R.id.btn3Id);
btn4 = (Button) findViewById(R.id.btn4Id);
btn5 = (Button) findViewById(R.id.btn5Id);
btn6 = (Button) findViewById(R.id.btn6Id);
btn7 = (Button) findViewById(R.id.btn7Id);
btn8 = (Button) findViewById(R.id.btn8Id);
btn9 = (Button) findViewById(R.id.btn9Id);
btn0 = (Button) findViewById(R.id.btn0Id);
btnPlus = (Button) findViewById(R.id.btnPlusId);
btnMinus = (Button) findViewById(R.id.btnMinusId);
btnTimes = (Button) findViewById(R.id.btnTimesId);
btnDivide = (Button) findViewById(R.id.btnDivideId);
btnModulo = (Button) findViewById(R.id.btnModuloId);
btnEquals = (Button) findViewById(R.id.btnEqualsId);
btnCA = (Button) findViewById(R.id.btnCAId);
MainDisplay = (TextView) findViewById(R.id.MainDisplayId);
try{
btn1.setOnClickListener((OnClickListener) this);
btn2.setOnClickListener((OnClickListener) this);
btn3.setOnClickListener((OnClickListener) this);
btn4.setOnClickListener((OnClickListener) this);
btn5.setOnClickListener((OnClickListener) this);
btn6.setOnClickListener((OnClickListener) this);
btn7.setOnClickListener((OnClickListener) this);
btn8.setOnClickListener((OnClickListener) this);
btn9.setOnClickListener((OnClickListener) this);
btn0.setOnClickListener((OnClickListener) this);
btnPlus.setOnClickListener((OnClickListener) this);
btnMinus.setOnClickListener((OnClickListener) this);
btnTimes.setOnClickListener((OnClickListener) this);
btnDivide.setOnClickListener((OnClickListener) this);
btnModulo.setOnClickListener((OnClickListener) this);
btnEquals.setOnClickListener((OnClickListener) this);
}catch(Exception e){
}
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"1";
MainDisplay.setText(getNum);
}
});
btn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"2";
MainDisplay.setText(getNum);
}
});
btn3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"3";
MainDisplay.setText(getNum);
}
});
btn4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"4";
MainDisplay.setText(getNum);
}
});
btn5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"5";
MainDisplay.setText(getNum);
}
});
btn6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"6";
MainDisplay.setText(getNum);
}
});
btn7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"7";
MainDisplay.setText(getNum);
}
});
btn8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"8";
MainDisplay.setText(getNum);
}
});
btn9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"9";
MainDisplay.setText(getNum);
}
});
btn0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"0";
MainDisplay.setText(getNum);
}
});
btnPlus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "+";
MainDisplay.setText("");
}
});
btnMinus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "-";
MainDisplay.setText("");
}
});
btnTimes.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "*";
MainDisplay.setText("");
}
});
btnDivide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "/";
MainDisplay.setText("");
}
});
btnModulo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "%";
MainDisplay.setText("");
}
});
btnEquals.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num2 = Integer.parseInt(MainDisplay.getText().toString());
if(op=="+"){
ans = num1 + num2;
MainDisplay.setText(Integer.toString(ans));
}else if(op=="-"){
ans = num1 - num2;
MainDisplay.setText(Integer.toString(ans));
}else if(op=="*"){
ans = num1 * num2;
MainDisplay.setText(Integer.toString(ans));
}else if(op=="/"){
ans = num1 / num2;
MainDisplay.setText(Integer.toString(ans));
}else if(op=="%"){
ans = num1 % num2;
MainDisplay.setText(Integer.toString(ans));
}
}
});
btnCA.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
MainDisplay.setText("");
}
});
}
enter code hereprotected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = (Button) findViewById(R.id.btn1Id);
btn2 = (Button) findViewById(R.id.btn2Id);
btn3 = (Button) findViewById(R.id.btn3Id);
btn4 = (Button) findViewById(R.id.btn4Id);
btn5 = (Button) findViewById(R.id.btn5Id);
btn6 = (Button) findViewById(R.id.btn6Id);
btn7 = (Button) findViewById(R.id.btn7Id);
btn8 = (Button) findViewById(R.id.btn8Id);
btn9 = (Button) findViewById(R.id.btn9Id);
btn0 = (Button) findViewById(R.id.btn0Id);
btnPlus = (Button) findViewById(R.id.btnPlusId);
btnMinus = (Button) findViewById(R.id.btnMinusId);
btnTimes = (Button) findViewById(R.id.btnTimesId);
btnDivide = (Button) findViewById(R.id.btnDivideId);
btnModulo = (Button) findViewById(R.id.btnModuloId);
btnEquals = (Button) findViewById(R.id.btnEqualsId);
btnCA = (Button) findViewById(R.id.btnCAId);
MainDisplay = (TextView) findViewById(R.id.MainDisplayId);
try{
btn1.setOnClickListener((OnClickListener) this);
btn2.setOnClickListener((OnClickListener) this);
btn3.setOnClickListener((OnClickListener) this);
btn4.setOnClickListener((OnClickListener) this);
btn5.setOnClickListener((OnClickListener) this);
btn6.setOnClickListener((OnClickListener) this);
btn7.setOnClickListener((OnClickListener) this);
btn8.setOnClickListener((OnClickListener) this);
btn9.setOnClickListener((OnClickListener) this);
btn0.setOnClickListener((OnClickListener) this);
btnPlus.setOnClickListener((OnClickListener) this);
btnMinus.setOnClickListener((OnClickListener) this);
btnTimes.setOnClickListener((OnClickListener) this);
btnDivide.setOnClickListener((OnClickListener) this);
btnModulo.setOnClickListener((OnClickListener) this);
btnEquals.setOnClickListener((OnClickListener) this);
}catch(Exception e){
}
btn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"1";
MainDisplay.setText(getNum);
}
});
btn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"2";
MainDisplay.setText(getNum);
}
});
btn3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"3";
MainDisplay.setText(getNum);
}
});
btn4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"4";
MainDisplay.setText(getNum);
}
});
btn5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"5";
MainDisplay.setText(getNum);
}
});
btn6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"6";
MainDisplay.setText(getNum);
}
});
btn7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"7";
MainDisplay.setText(getNum);
}
});
btn8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"8";
MainDisplay.setText(getNum);
}
});
btn9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"9";
MainDisplay.setText(getNum);
}
});
btn0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
getNum = MainDisplay.getText().toString();
getNum = getNum+"0";
MainDisplay.setText(getNum);
}
});
btnPlus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "+";
MainDisplay.setText("");
}
});
btnMinus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "-";
MainDisplay.setText("");
}
});
btnTimes.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "*";
MainDisplay.setText("");
}
});
btnDivide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "/";
MainDisplay.setText("");
}
});
btnModulo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1 = Integer.parseInt(MainDisplay.getText().toString());
op = "%";
MainDisplay.setText("");
}
});
btnEquals.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num2 = Integer.parseInt(MainDisplay.getText().toString());
if(op=="+"){
ans = num1 + num2;
MainDisplay.setText(Integer.toString(ans));
}else if(op=="-"){
ans = num1 - num2;
MainDisplay.setText(Integer.toString(ans));
}else if(op=="*"){
ans = num1 * num2;
MainDisplay.setText(Integer.toString(ans));
}else if(op=="/"){
ans = num1 / num2;
MainDisplay.setText(Integer.toString(ans));
}else if(op=="%"){
ans = num1 % num2;
MainDisplay.setText(Integer.toString(ans));
}
}
});
btnCA.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
MainDisplay.setText("");
}
});
}
我看不出你在哪里声明op，但我假设它是一个字符串 试一试
您的代码中也存在大量重复，可以编写一些方法来消除这种重复，而不是使用数百个侦听器，只使用一个或多个if语句您是否尝试过将一堆代码塞进一个脚本中？
if(op.equals("")){
//Do nothing
}