myCalc App (1)

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<?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"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/editTextNumberDecimal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="3"
        android:hint="Input your Number"
        android:gravity="bottom|right"
        android:textSize="20dp"
        android:inputType="numberDecimal" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_weight="1">

        <Button
            android:id="@+id/btn_1"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="1" />

        <Button
            android:id="@+id/btn_2"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="2" />

        <Button
            android:id="@+id/btn_3"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="3" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_weight="1">

        <Button
            android:id="@+id/btn_4"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="4" />

        <Button
            android:id="@+id/btn_5"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="5" />

        <Button
            android:id="@+id/btn_6"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="6" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_weight="1">

        <Button
            android:id="@+id/btn_7"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="7" />

        <Button
            android:id="@+id/btn_8"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="8" />

        <Button
            android:id="@+id/btn_9"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="9" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_weight="1">

        <TextView
            android:id="@+id/textView"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="" />

        <Button
            android:id="@+id/btn_0"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:textSize="20dp"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="0" />

        <Button
            android:id="@+id/btn_clear"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:layout_marginLeft="2dp"
            android:layout_marginRight="2dp"
            android:text="clear" />
    </LinearLayout>

    <Button
        android:id="@+id/btn_ok"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="OK" />
</LinearLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity{

    EditText editTextNumberDecimal;
    String numString="";

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

        editTextNumberDecimal = findViewById(R.id.editTextNumberDecimal);


        Button.OnClickListener onClickListener = new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                switch (view.getId()) {
                    case R.id.btn_0:
                        if(numString.equals("")){
                            numString = "";
                        }
                        else {
                            numString += "0";
                        }
                        break;
                    case R.id.btn_1:
                        numString += "1";
                        break;
                    case R.id.btn_2:
                        numString += "2";
                        break;
                    case R.id.btn_3:
                        numString += "3";
                        break;
                    case R.id.btn_4:
                        numString += "4";
                        break;
                    case R.id.btn_5:
                        numString += "5";
                        break;
                    case R.id.btn_6:
                        numString += "6";
                        break;
                    case R.id.btn_7:
                        numString += "7";
                        break;
                    case R.id.btn_8:
                        numString += "8";
                        break;
                    case R.id.btn_9:
                        numString += "9";
                        break;
                    case R.id.btn_clear:
                        numString = "";
                        break;
                    case R.id.btn_ok:
                        Toast.makeText(getApplicationContext(),numString,Toast.LENGTH_SHORT).show();
                        numString = "";
                        break;
                    default:
                        break;
                }
                //editTextNumberDecimal.setGravity(Gravity.RIGHT | Gravity.BOTTOM);
                editTextNumberDecimal.setText(numString);
            }
        };


        Button btn_0 = findViewById(R.id.btn_0);
        btn_0.setOnClickListener(onClickListener);
        Button btn_1 = findViewById(R.id.btn_1);
        btn_1.setOnClickListener(onClickListener);
        Button btn_2 = findViewById(R.id.btn_2);
        btn_2.setOnClickListener(onClickListener);
        Button btn_3 = findViewById(R.id.btn_3);
        btn_3.setOnClickListener(onClickListener);
        Button btn_4 = findViewById(R.id.btn_4);
        btn_4.setOnClickListener(onClickListener);
        Button btn_5 = findViewById(R.id.btn_5);
        btn_5.setOnClickListener(onClickListener);
        Button btn_6 = findViewById(R.id.btn_6);
        btn_6.setOnClickListener(onClickListener);
        Button btn_7 = findViewById(R.id.btn_7);
        btn_7.setOnClickListener(onClickListener);
        Button btn_8 = findViewById(R.id.btn_8);
        btn_8.setOnClickListener(onClickListener);
        Button btn_9 = findViewById(R.id.btn_9);
        btn_9.setOnClickListener(onClickListener);
        Button btn_clear = findViewById(R.id.btn_clear);
        btn_clear.setOnClickListener(onClickListener);
        Button btn_ok = findViewById(R.id.btn_ok);
        btn_ok.setOnClickListener(onClickListener);
    }
}