i'm trying to open new activity by using button

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Mobile

Android

when i click on button for open a new activity it show home page in emulator what can be the reason thanks in advance.. :)

//this code in mainactivity


Intent intent=new Intent(this,Result.class);
startActivity(intent);


>>>>>>>>>>>>>>>>activity code in manifest

<activity>
            android:name=".newcelci"
            android:label="@string/title_activity_newcelci" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" xmlns:android="#unknown" />

                <category android:name="android.intent.category.LAUNCHER" xmlns:android="#unknown" />
            </intent-filter>
        </activity>
        <activity>
            android:name=".Result"
            android:label="@string/title_activity_result" >
        </activity>

package ahmadraza.com.firstapp;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class newcelci extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_newcelci);
    }

    @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_newcelci, 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);
    }
    public void doadd(View v)
    {
        if(v.getId() == R.id.btnadd)
        {
            MessageBox("Hello World");
        }
    }

    public void MessageBox(String message)
    {
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
    }
    // public void doadd(View view){
     //   EditText num1=(EditText)findViewById(R.id.etnum1);
       // EditText num2=(EditText)findViewById(R.id.etnum2);

        //int a=Integer.parseInt( num1.getText().toString());
        //int b=Integer.parseInt(num2.getText().toString());

        //Intent intent=new Intent(this,Result.class);
        //startActivity(intent);


        //TextView result=(TextView) findViewById(R.id.tvresult);
        //result.setText(String.valueOf(a+b));


    //}
public void dosub(View view){

    EditText num1=(EditText)findViewById(R.id.etnum1);
    EditText num2=(EditText)findViewById(R.id.etnum2);

    int a=Integer.parseInt( num1.getText().toString());
    int b=Integer.parseInt( num2.getText().toString());

    Intent intent1=new Intent(this,Result.class);
    startActivity(intent1);

    //TextView result=(TextView) findViewById(R.id.tvresult);
    //result.setText(String.valueOf(a-b));

   }
}

<!--?xml version="1.0" encoding="utf-8"?-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="ahmadraza.com.firstapp">

    <application android:allowbackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme">
        <activity android:name=".newcelci" android:label="@string/title_activity_newcelci">
            <intent-filter>
                <action android:name="android.intent.action.MAIN">

                <category android:name="android.intent.category.LAUNCHER">
            </category></action></intent-filter>
        </activity>
        <activity android:name=".Result" android:label="@string/title_activity_result">
        </activity>
    </application>

</manifest>

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" android:paddingbottom="@dimen/activity_vertical_margin" tools:context="ahmadraza.com.firstapp.newcelci">


    <textview android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="@string/Number1"
              android:id="@+id/textView"
              android:layout_alignparenttop="true"
              android:layout_centerhorizontal="true">

    <edittext android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:id="@+id/etnum1"
              android:inputtype="number"
              android:layout_below="@+id/textView"
              android:layout_alignleft="@+id/etnum2"
              android:layout_alignstart="@+id/etnum2">

    <textview android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="@string/Number2"
              android:id="@+id/textView2"
              android:layout_below="@+id/etnum1"
              android:layout_alignleft="@+id/textView"
              android:layout_alignstart="@+id/textView">

    <edittext android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:id="@+id/etnum2"
              android:inputtype="number"
              android:layout_below="@+id/textView2"
              android:layout_centerhorizontal="true">

    <textview android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="@string/Result"
              android:id="@+id/textView3"
              android:layout_below="@+id/etnum2"
              android:layout_centerhorizontal="true">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/ADD"
        android:id="@+id/btnadd"
        android:/>


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/SUB"
        android:id="@+id/btnsub"
        android:/>

    <textview android:layout_width="wrap_content" 
              android:layout_height="wrap_content"
              android:id="@+id/tvresult"
              android:layout_below="@+id/btnsub"
              android:layout_centerhorizontal="true"
              android:layout_margintop="33dp">
    </textview>
    </textview>
    </edittext>
    </textview>
    </edittext>
    </textview>
</relativelayout>