我試圖搜索錯誤,但無法找到任何在Android監視器。 當我點擊任何按鈕,它說應用程序不工作。 Android Monitor也沒有生成錯誤。沒有錯誤的androidmonitor仍然應用程序崩潰按鈕單擊
代碼: 公共類MainActivity擴展AppCompatActivity {
Button btn_dot,btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btn0, btn_add, btn_sub, btn_mul, btn_equals, btn_div, btn_del;
Double total1 = 0.0, total2 = 0.0;
EditText et1,tv;
char op = '0';
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (EditText) findViewById(R.id.tv);
btn1 = (Button) findViewById(R.id.Button1);
btn2 = (Button) findViewById(R.id.Button2);
btn3 = (Button) findViewById(R.id.Button3);
btn4 = (Button) findViewById(R.id.Button4);
btn5 = (Button) findViewById(R.id.Button5);
btn6 = (Button) findViewById(R.id.Button6);
btn7 = (Button) findViewById(R.id.Button7);
btn8 = (Button) findViewById(R.id.Button8);
btn9 = (Button) findViewById(R.id.Button9);
btn0 = (Button) findViewById(R.id.Button0);
btn_add = (Button) findViewById(R.id.Button_add);
btn_sub = (Button) findViewById(R.id.Button_sub);
btn_mul = (Button) findViewById(R.id.Button_mul);
btn_div = (Button) findViewById(R.id.Button_divide);
btn_equals = (Button) findViewById(R.id.Button_equals);
btn_del = (Button) findViewById(R.id.Button_DEL);
btn_dot = (Button) findViewById(R.id.Button_dot);
btn0.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"0";
et1.setText(val);
tv.setText(val);
}
});
btn1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"1";
et1.setText(val);
tv.setText(val);
}
});
btn2.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"2";
et1.setText(val);
tv.setText(val);
}
});
btn3.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"3";
et1.setText(val);
tv.setText(val);
}
});
btn4.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"4";
et1.setText(val);
tv.setText(val);
}
});
btn5.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"5";
et1.setText(val);
tv.setText(val);
}
});
btn6.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"6";
et1.setText(val);
tv.setText(val);
}
});
btn7.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"7";
et1.setText(val);
tv.setText(val);
}
});
btn8.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"8";
et1.setText(val);
tv.setText(val);
}
});
btn9.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+"9";
et1.setText(val);
tv.setText(val);
}
});
btn_dot.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CharSequence val=et1.getText()+".";
et1.setText(val);
tv.setText(val);
}
});
btn_add.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
total1 = Double.parseDouble(et1.getText() + "");
et1.setText(null);
et1.setText('+');
tv.append("+");
op = '+';
et1.setText(null);
// OpCalculation();
}
});
btn_sub.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
total1 = Double.parseDouble(et1.getText() + "");
et1.setText(null);
et1.append("-");
tv.append("-");
op = '-';
et1.setText(null);
// OpCalculation();
}
});
btn_mul.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
total1 = Double.parseDouble(et1.getText() + "");
et1.setText(null);
et1.append("*");
tv.append("*");
op = '*';
et1.setText(null);
// OpCalculation();
}
});
btn_div.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
total1 = Double.parseDouble(et1.getText() + "");
et1.setText(null);
et1.append("/");
tv.append("/");
op = '/';
et1.setText(null);
// OpCalculation();
}
});
btn_equals.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
total2 = Double.parseDouble(et1.getText() + "");
et1.setText(null);
if (op == '+') {
total1 += total2;
String t1=String.valueOf(total1);
tv.setText(t1);
op='0';}
if (op == '-') {
total1 -= total2;
String t1=String.valueOf(total1);
tv.setText(t1);
op='0';}
if (op == '*') {
total1 *= total2;
String t1=String.valueOf(total1);
tv.setText(t1);
op='0';}
if (op == '/') {
total1 /= total2;
String t1=String.valueOf(total1);
tv.setText(t1);
op='0';}
}
});
btn_del.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
et1.setText("0");
tv.setText("0");
total1 = 0.0;
total2 = 0.0;
}
});
}
}
ET1變化似乎尚未初始化。 –