Running an android application [closed] - android-emulator

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I am having trouble when I am trying to run my simple android applications On my system
I tested for some other applications which were not created on my system and those worked well but when I edit those on my system then also these applications wont work. I am getting many errors
09-26 07:23:55.458: E/AndroidRuntime(1341): ... 11 more
at com.calculation.MainActivity.<init>(MainActivity.java:19)
at java.lang.Class.newInstanceImpl(Native Method)
: at java.lang.Class.newInstance(Class.java:1130)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
Why am I getting this
Please Help me
package com.calculation;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.app.AlertDialog;
import android.content.DialogInterface;
public class MainActivity extends Activity {
EditText value1,value2;
Button add;
TextView display;
int num1=0, num2=0, total=0;
final AlertDialog alertdialog= new AlertDialog.Builder(MainActivity.this).create();
#SuppressWarnings("deprecation")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
value1=(EditText)findViewById(R.id.input1);
value2=(EditText)findViewById(R.id.input2);
add=(Button)findViewById(R.id.btnadd);
display=(TextView)findViewById(R.id.result);
if(value1==null)
{
alertdialog.setTitle("AlertDialog");
alertdialog.setMessage("Please Enter a Valid Input");
alertdialog.setIcon(R.drawable.ic_launcher);
alertdialog.setButton("Ok", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "You Clicked OK" , Toast.LENGTH_LONG).show();
}
});
}
else if(value2==null)
{
alertdialog.setTitle("AlertDialog");
alertdialog.setMessage("Please Enter a Valid Input");
alertdialog.setIcon(R.drawable.ic_launcher);
alertdialog.setButton("Ok", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "You Clicked OK" , Toast.LENGTH_LONG).show();
}
});
}
add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
num1=Integer.parseInt(value1.getText().toString());
num2=Integer.parseInt(value2.getText().toString());
total=num1+num2;
display.setText("ADDITION IS"+total);
}
});
}
}

Answer 1

The Problem was of api levels the apps which were tested were created many years back in different api level and environment so the alert dialog error was coming
alert dialog can be in this way
private void showinvalidemail() {
// TODO Auto-generated method stub
AlertDialog.Builder dialogbuilder = new AlertDialog.Builder(this);
dialogbuilder.setTitle("Invalid Email");
dialogbuilder.setMessage("Please Enter Valid Email");
dialogbuilder.setIcon(R.drawable.mexit);
dialogbuilder.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface arg0, int arg1) {
// TODOAuto-generated method stub
Toast.makeText(getApplicationContext(),
"You Clicked OK", Toast.LENGTH_LONG).show();
}
});
AlertDialog alertdialog = dialogbuilder.create();
alertdialog.show();
}