حاسبه

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity{

    EditText SX2,SX1;
    TextView Y1,Y2;
    Button enter;

    @Override    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        EditText SX = (EditText) findViewById(R.id.SX);

        SX2 = (EditText) findViewById(R.id.SX);
        SX1 = (EditText) findViewById(R.id.SX1);
        Y1 = (TextView) findViewById(R.id.Y1);
        Y2 = (TextView) findViewById(R.id.Y2);

        enter = (Button)findViewById(R.id.enter);
        enter.setOnClickListener(new View.OnClickListener() {

            @Override            public void onClick(View v) {
                float msroof_mnh,mtwfer_rateeb,al_s3er;
                float al_rateeb = 0;
                float al_msroof = 0;

                al_rateeb = Float.parseFloat(SX2.getText().toString());
                al_s3er = Float.parseFloat(SX1.getText().toString());
                mtwfer_rateeb = al_rateeb - al_s3er;
                msroof_mnh = al_msroof + al_s3er;


                Y1.setText(""+mtwfer_rateeb+"");
                Y2.setText(""+msroof_mnh+"");

            }
        });


    }
}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:layout_margin="15dp"    android:orientation="vertical" >

    <LinearLayout        android:id="@+id/linearLayout1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical"        android:gravity="right"        android:layout_marginLeft="10pt"        android:layout_marginRight="10pt"        android:layout_marginTop="3pt" >


        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="right" >

            <EditText                android:id="@+id/SX"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:ems="10"                android:layout_weight="2"                android:inputType="numberDecimal" >

                <requestFocus />
            </EditText>

            <TextView                android:layout_width="50dp"                android:layout_height="wrap_content"                android:layout_weight="1"                android:text="الراتب :"                android:textAppearance="?android:attr/textAppearanceMedium" />

        </LinearLayout>
        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="right" >

            <EditText                android:id="@+id/SX1"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:ems="10"                android:layout_weight="2"                android:inputType="numberDecimal" >

                <requestFocus />
            </EditText>

            <TextView                android:layout_width="50dp"                android:layout_height="wrap_content"                android:layout_weight="1"                android:text="قيمة السعر :"                android:textAppearance="?android:attr/textAppearanceMedium" />

        </LinearLayout>

        <LinearLayout            android:layout_width="match_parent"            android:gravity="right"            android:layout_height="wrap_content" >

            <TextView                android:id="@+id/Y1"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text=""                android:textAppearance="?android:attr/textAppearanceMedium" />

            <TextView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="المتوفر من الراتب :"                android:textAppearance="?android:attr/textAppearanceMedium" />

        </LinearLayout>

        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:gravity="right" >

            <TextView                android:id="@+id/Y2"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text=""                android:textAppearance="?android:attr/textAppearanceMedium" />

            <TextView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="المصروف منه :"                android:textAppearance="?android:attr/textAppearanceMedium" />

        </LinearLayout>

        <Button            android:id="@+id/enter"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="center"            android:text="حساب" />

    </LinearLayout>

</LinearLayout>