Android Fish Shop Inventory App

This tutorial will teach you  to make a small Fish shop Inventory  system using android studio. The following  app will use to manage the Fish shop.The app is developed steps ahead of the existing world. While app development will be very useful for the future as well.

We made the layout design

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity">
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:gravity="center">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Fish Inventory Shop"
            android:textColor="@color/colorAccent"
            android:textSize="30dp" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Mes" />

        <Spinner
            android:id="@+id/sp1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:dropDownSelector="@color/colorAccent" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Qty" />

        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:id="@+id/qty"
            android:textAlignment="center"
            />
    </LinearLayout>



    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center">



        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:id="@+id/bt1"
            android:text="Ok"
            android:background="@color/colorPrimary"
            />

    </LinearLayout>


    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Total" />

        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ems="10"
            android:id="@+id/tot"
            android:textAlignment="center"
            />
    </LinearLayout>
</LinearLayout>

MainActivity

public class MainActivity extends AppCompatActivity {
    Spinner s1;
    EditText ed1,ed2;
    Button b1;

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

        ed1= findViewById(R.id.qty);
        ed2= findViewById(R.id.tot);
        s1 = findViewById(R.id.sp1);

        String[] mes = {"Kg","Gr"};
        ArrayAdapter ad = new ArrayAdapter<String>(this,R.layout.support_simple_spinner_dropdown_item,mes);
        s1.setAdapter(ad);
        b1 = findViewById(R.id.bt1);
        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String item = s1.getSelectedItem().toString();
                double qty = Double.parseDouble(ed1.getText().toString());

                if(item.equals("Kg"))
                {
                    double cal = (qty * 140) ;
                    ed2.setText(String.valueOf(cal));
                }
                else
                {
                    double cal = (qty/1000 * 140) ;
                    ed2.setText(String.valueOf(cal));
                }
            }
        });

    }
}

I have attached the video tutorial below it will help you  to do this  step by step.