TextView ,EditText, and Button In Android Studio | Java | Xml | In Urdu

TextView:
A user interfaces element that displays text to the user.

EditText:
A user interfaces element for entering and modifying text.

Button:
A user interfaces element the user can tap or click to perform an action.

?xml version="1.0" encoding="utf-8"?
androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".MainActivity"
EditText
android:id="@+id/edtfirstnumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="90dp"
android:ems="10"
android:inputType="number"
android:hint="First Number"/
EditText
android:id="@+id/edtsecondnumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginTop="30dp"
app:layout_constraintTop_toBottomOf="@+id/edtfirstnumber"
app:layout_constraintRight_toRightOf="parent"
android:ems="10"
android:inputType="number"
android:hint="Enter Second Number"/
Button
android:id="@+id/btnadd"
android:layout_width="wrap_content"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginTop="50dp"
app:layout_constraintTop_toBottomOf="@+id/edtsecondnumber"
app:layout_constraintRight_toRightOf="parent"
android:layout_height="wrap_content"
android:text="Add" /
TextView
android:id="@+id/txtresult"
android:layout_width="wrap_content"
android:layout_marginTop="50dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@+id/btnadd"
app:layout_constraintRight_toRightOf="parent"
android:layout_height="wrap_content"
android:textSize="35dp"
android:textStyle="bold"
android:textColor="@color/black"
android:text="90"/
androidx.constraintlayout.widget.ConstraintLayout

Java Code:


public class MainActivity extends AppCompatActivity {
EditText edtfn,edtsecondnumber;
TextView txtresult;
Button btnadd;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

/////// these steps refers to initialization of controllers.

edtfn=findViewById(R.id.edtfirstnumber);
edtsecondnumber=findViewById(R.id.edtsecondnumber);
btnadd=findViewById(R.id.btnadd);
txtresult=findViewById(R.id.txtresult);

//////////////////////////////////////////////

btnadd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

////////////////////////////
String a,b;
a=edtfn.getText().toString();
b=edtsecondnumber.getText().toString();

int x,y;
x=Integer.parseInt(a);
y=Integer.parseInt(b);

int z;
z=x+y;
txtresult.setText(z+"");



}
});



}
}