根据男女姓名计算两人姻缘值

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

    private EditText et_boyname;
    private EditText et_girlname;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_boyname = (EditText) this.findViewById(R.id.et_boyname);
        et_girlname = (EditText) this.findViewById(R.id.et_girlname);
    }

    public void btn_calc(View view) {
        String boyname = et_boyname.getText().toString();
        String girlname = et_girlname.getText().toString();
        if (TextUtils.isEmpty(boyname)) {
            Toast.makeText(this, "男生姓名不能为空", 0).show();
            et_boyname.setFocusableInTouchMode(true);
            et_boyname.requestFocus();
            et_boyname.requestFocusFromTouch();

            return;
        }
        if (TextUtils.isEmpty(girlname)) {
            Toast.makeText(this, "女生姓名不能为空", 0).show();
            et_girlname.setFocusableInTouchMode(true);
            et_girlname.requestFocus();
            et_girlname.requestFocusFromTouch();
            return;
        }
        Intent intent = new Intent(this, SecondActivity.class);
        intent.putExtra("boyname", boyname);
        intent.putExtra("girlname", girlname);
        startActivity(intent);

    }

}

mport android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SecondActivity extends Activity {

    private TextView tv_result;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        tv_result = (TextView) this.findViewById(R.id.tv_result);
        Intent intent = getIntent();
        if (intent != null) {
            String boyname = intent.getStringExtra("boyname");
            String girlname = intent.getStringExtra("girlname");
            int hashcode = boyname.hashCode() + girlname.hashCode();
            Random random = new Random(hashcode);
            int ran = random.nextInt(100);
            tv_result.setText(boyname + "和" + girlname + "的姻缘值:" + ran);
        }
    }
}

<LinearLayout 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:orientation="vertical"
    tools:context=".MainActivity" 
    android:gravity="center_vertical"
    android:background="@drawable/aiqing">

    <EditText 
        android:id="@+id/et_boyname"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:hint="请输入男孩姓名"/>
    <EditText 
        android:layout_marginTop="30dp"
        android:id="@+id/et_girlname"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:hint="请输入女孩姓名"/>

    <Button
        android:layout_marginTop="30dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:gravity="center_vertical|center_horizontal"
        android:onClick="btn_calc"
        android:text="开始计算姻缘" />

</LinearLayout>

<LinearLayout 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:background="@drawable/jieguo"
    android:orientation="vertical"
    tools:context=".SecondActivity" >

    <TextView
        android:gravity="center_vertical"
        android:id="@+id/tv_result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#ff0000"
        android:textSize="18sp"
        android:text="姻缘值" />

</LinearLayout>