【发布时间】：2015-10-25 01:40:36
【问题描述】：
这是一个使用Android Studio 为基本计算器编码的应用程序。在编码结束之前有一个错误。我在编码中直接提到了error。
能否请大家解释一下这个错误是怎么回事，我该如何纠正它？
package com.example.asish.calculator;
import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
Button bone, btwo, bthree, bfour, bfive, bsix, bseven, beight, bnine, bzero, badd, bsub, bmul, bdiv, bclear,
bce, bequal;
TextView txt;
String s = "", s1 = "", s2 = "", s3 = "";
int i = 0, i1 = 0, c = -1, flag_disable = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bone = (Button) findViewById(R.id.one);
btwo = (Button) findViewById(R.id.two);
bthree = (Button) findViewById(R.id.three);
bfour = (Button) findViewById(R.id.four);
bfive = (Button) findViewById(R.id.five);
bsix = (Button) findViewById(R.id.six);
bseven = (Button) findViewById(R.id.seven);
beight = (Button) findViewById(R.id.eight);
bnine = (Button) findViewById(R.id.nine);
bzero = (Button) findViewById(R.id.zero);
bce = (Button) findViewById(R.id.ce);
bequal = (Button) findViewById(R.id.equals);
bclear = (Button) findViewById(R.id.clear);
badd = (Button) findViewById(R.id.plus);
bsub = (Button) findViewById(R.id.minus);
bdiv = (Button) findViewById(R.id.division);
bmul = (Button) findViewById(R.id.multiply);
bone.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+"1");
s = "";
}
});
btwo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+"2");
s = "";
}
});
bthree.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+"3");
s = "";
}
});
bfour.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+"4");
s = "";
}
});
bfive.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+"5");
s = "";
}
});
bsix.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+"6");
s = "";
}
});
bseven.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+"7");
s = "";
}
});
beight.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+"8");
s = "";
}
});
bnine.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+9);
s = "";
}
});
bzero.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if(s.equals("+")||s.equals("-")||s.equals("/")||s.equals("*")) {
txt.setText("");
s = "";
}
txt.setText(s+"0");
s = "";
}
});
badd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String tmp = (String) txt.getText();
if(!tmp.equals("+")&&!tmp.equals("-")&&!tmp.equals("*")&&!tmp.equals("/"))
s1=tmp;
c=0;
txt.setText("+");
}
});
bsub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String tmp = (String) txt.getText();
if(!tmp.equals("+")&&!tmp.equals("-")&&!tmp.equals("*")&&!tmp.equals("/"))
s1=tmp;
c=2;
txt.setText("-");
}
});
bmul.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String tmp = (String) txt.getText();
if(!tmp.equals("+")&&!tmp.equals("-")&&!tmp.equals("*")&&!tmp.equals("/"))
s1=tmp;
c=3;
txt.setText("*");
}
});
bdiv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String tmp = (String) txt.getText();
if(!tmp.equals("+")&&!tmp.equals("-")&&!tmp.equals("*")&&!tmp.equals("/"))
s1=tmp;
c=2;
txt.setText("/");
}
});
bequal.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(s1=="+"||s1=="-"||s1=="/"||s1=="*") {
i = 0;
}
else if(s1==null|| s1==""||s1.trim().length()==0) {
i = i;
}
else {
i = Integer.parseInt(s1);
}
s2 = (String) txt.getText();
if(s2=="+"||s2=="-"||s2=="/"||s2=="*") {
i1 = 0;
}
else if(s2==null|| s2==""||s2.trim().length()==0) {
i1 = 0;
}
else {
i1 = Integer.parseInt(s2);
}
if(c==0) {
i = i + i1;
}
else if(c==1) {
i = i - i1;
}
else if(c==2){
if(i1==0) {
Toast.makeText(getApplicationContext(), "Invalid Input", Toast.LENGTH_LONG).show();
i = 0;
}
else{
i = i / i1;
}
}
else if(c==3) {
i = i * i1;
}
else {
i = 0;
}
txt.setText(i+"");
}
});
bclear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
s = (String) txt.getText();
if (s.equals("+") || s.equals("-") || s.equals("/") || s.equals("*") || s.equals("")) {
i = 0;
} else {
i = Integer.parseInt(s);
i = i / 10;
}
if (i == 0) {
txt.setText("");
} else {
txt.setText(i + "");
}
s = null;
}
});
bce.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
txt.setText("");
i = 0;
i1 = 0;
s1 = "";
s2 = "";
c = -1;
}
});
}
} --> Error in this line. Error message - Class or interface expected.
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
【问题讨论】：
-
至少，发布你的堆栈跟踪
-
检查你的左括号和右括号是否匹配。
-
尝试删除错误行上的大括号。
-
@ PM 77-1 --> 我猜开始和结束括号是匹配的。你也可以通过它们一次吗？这会有很大帮助。提前致谢。
-
@GregHewgill --> 请直接滚动到最后。您可以看到包含错误的行。谢谢。
标签： java android android-studio android-activity onclick