trying to make a simple Calculator with just the "-" and "=" for a simple
output but my xml and java are erroring like crazy. is my coding wack? heres
the 2 files
any help would be great thanks
java
import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Calculator extends Activity {
public EditText input1;
public EditText input2;
public EditText solution;
public TextView operator;
public Calculator mContext;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mContext = this;
setContentView(R.layout.main);
input1 = (EditText) findViewById(R.id.input1);
input2 = (EditText) findViewById(R.id.input2);
solution = (EditText) findViewById(R.id.solution);
operator = (TextView) findViewById(R.id.operator);
// We create an OnClick Event in each button.
Button minusButton = (Button)
findViewById(R.id.minusbutton);
Button equalButton = (Button)
findViewById(R.id.equalButton); {
operator.setText("+");
}
});
minusButton.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
operator.setText("-");
}
public void onClick(View arg0) {
operator.setText("*");
equalButton.setOnClickListener(new OnClickListener() {
private AlertDialog show;
public void onClick(View arg0) {
if ((input1.getText().length() == 0)
||
(input1.getText().toString() == " ")
||
(input2.getText().length() == 0)
||
(input2.getText().toString() == " ")) {
show = new
AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("Some
inputs are empty")
.setPositiveButton("OK", null).show();
} else if (operator.getText().equals("")) {
show = new
AlertDialog.Builder(mContext).setTitle("Error")
.setMessage("Operator is null").setPositiveButton(
"OK", null).show();
} else if (operator.getText().equals("+")) {
double result = new
Double(input1.getText().toString())
+ new
Double(input2.getText().toString());
solution.setText(Double.toString(result));
} else if (operator.getText().equals("-")) {
double result = new
Double(input1.getText().toString())
- new
Double(input2.getText().toString());
solution.setText(Double.toString(result));
} else if (operator.getText().equals("*")) {
double result = new
Double(input1.getText().toString())
* new
Double(input2.getText().toString());
solution.setText(Double.toString(result));
} else if (operator.getText().equals("/")) {
double result = new
Double(input1.getText().toString())
/ new
Double(input2.getText().toString());
solution.setText(Double.toString(result));
}
}
});
}
}
xml
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="@+id/widget0"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android";
>
<EditText
android:id="@+id/input1"
android:layout_width="175px"
android:layout_height="wrap_content"
android:text="EditText"
android:textSize="18sp"
android:layout_x="66px"
android:layout_y="54px"
>
</EditText>
<TextView
android:id="@+id/operator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:layout_x="114px"
android:layout_y="110px"
>
</TextView>
<EditText
android:id="@+id/input2"
android:layout_width="175px"
android:layout_height="wrap_content"
android:text="EditText"
android:textSize="18sp"
android:layout_x="64px"
android:layout_y="148px"
>
</EditText>
<EditText
android:id="@+id/solution"
android:layout_width="302px"
android:layout_height="wrap_content"
android:text="EditText"
android:textSize="18sp"
android:layout_x="7px"
android:layout_y="380px"
>
</EditText>
<Button
android:id="@+id/minusbutton"
android:layout_width="46px"
android:layout_height="wrap_content"
android:text="-"
android:layout_x="124px"
android:layout_y="268px"
>
</Button>
<Button
android:id="@+id/equalButton"
android:layout_width="99px"
android:layout_height="wrap_content"
android:text="="
android:layout_x="95px"
android:layout_y="314px"
>
</Button>
</AbsoluteLayout>
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