Android Calculator Project:

Android Calculator Project:

MainActivity.java

packagecom.sattar.sattarcalculator;

importandroid.app.Activity;

importandroid.graphics.Color;

importandroid.os.Bundle;

importandroid.view.View;

importandroid.widget.EditText;

importandroid.widget.TextView;

importandroid.widget.Toast;

publicclassMainActivityextends Activity {

       EditTextinp1, inp2;

       TextViewout;

       @Override

       protectedvoidonCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

              inp1 = (EditText) findViewById(R.id.editText1);

              inp2 = (EditText) findViewById(R.id.editText2);

              out = (TextView) findViewById(R.id.textView1);

       }

       publicvoid add(View v) {

              String str1 = inp1.getText().toString();

              String str2 = inp2.getText().toString();

              if (!str1.equals("") && !str2.equals("")) {

                     double inpt1 = Double.parseDouble(str1);

                     double inpt2 = Double.parseDouble(str2);

                     double result = inpt1 + inpt2;

                     Toast.makeText(getApplicationContext(), "Result= " + result,

                                  Toast.LENGTH_LONG).show();

                     out.setText("Result= " + result);

              } else {

                     out.setTextColor(Color.RED);

                     out.setText("Please Enter Both number...");

              }

       }

       publicvoid subtract(View v) {

              String str1 = inp1.getText().toString();

              String str2 = inp2.getText().toString();

              if (!str1.equals("") && !str2.equals("")) {

                     double inpt1 = Double.parseDouble(str1);

                     double inpt2 = Double.parseDouble(str2);

                     double result = inpt1 - inpt2;

                     Toast.makeText(getApplicationContext(), "Result= " + result,

                                  Toast.LENGTH_LONG).show();

                     out.setText("Result= " + result);

              } else {

                     out.setTextColor(Color.RED);

                     out.setText("Please Enter Both number...");

              }

       }

       publicvoidmul(View v) {

              String str1 = inp1.getText().toString();

              String str2 = inp2.getText().toString();

              if (!str1.equals("") && !str2.equals("")) {

                     double inpt1 = Double.parseDouble(str1);

                     double inpt2 = Double.parseDouble(str2);

                     double result = inpt1 * inpt2;

                     Toast.makeText(getApplicationContext(), "Result= " + result,

                                  Toast.LENGTH_LONG).show();

                     out.setText("Result= " + result);

              } else {

                     out.setTextColor(Color.RED);

                     out.setText("Please Enter Both number...");

              }

       }

       publicvoid div(View v) {

              String str1 = inp1.getText().toString();

              String str2 = inp2.getText().toString();

              if (!str1.equals("") && !str2.equals("")) {

                     double inpt1 = Double.parseDouble(str1);

                     double inpt2 = Double.parseDouble(str2);

                     double result = inpt1 / inpt2;

                     Toast.makeText(getApplicationContext(), "Result= " + result,

                                  Toast.LENGTH_LONG).show();

                     out.setText("Result= " + result);

              } else {

                     out.setTextColor(Color.RED);

                     out.setText("Please Enter Both number...");

              }

       }

}

Activity_main.xml

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical">

<EditText

android:id="@+id/editText1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:ems="10"

android:inputType="numberDecimal">

<requestFocus/>

</EditText>

<EditText

android:id="@+id/editText2"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:ems="10"

android:inputType="numberDecimal"/>

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content">

<Button

android:id="@+id/button1"

android:layout_width="0dp"

android:layout_weight="1"

android:onClick="add"

android:layout_height="wrap_content"

android:text="+"/>

<Button

android:id="@+id/button2"

android:layout_width="0dp"

android:layout_weight="1"

android:layout_height="wrap_content"

android:onClick="subtract"

android:text="-"/>

<Button

android:id="@+id/button3"

android:layout_width="0dp"

android:layout_weight="1"

android:onClick="mul"

android:layout_height="wrap_content"

android:text="*"/>

<Button

android:id="@+id/button4"

android:layout_width="0dp"

android:layout_weight="1"

android:onClick="div"

android:layout_height="wrap_content"

android:text="/"/>

</LinearLayout>

<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Result"/>

</LinearLayout>