Android Programming: Part 9 : Working with Colors and Color Algorithm.

Java Part :

package first.learn.edittextproject;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;

import android.graphics.Color;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.text.DecimalFormat;

public class MainActivity extends AppCompatActivity {

    EditText etTwo,
            etOne;

    TextView tvResult, txtNewResult;
    Button btnPlus, btnMinus, btnDevide, btnMulitiply;

    int grey, sky, red, blue, yellow;

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

        etTwo = (EditText) findViewById(R.id.etTwo);
        etOne = (EditText) findViewById(R.id.etOne);

        tvResult = (TextView) findViewById(R.id.tvResult);
        btnPlus = (Button) findViewById(R.id.btnPlus);
        btnMinus = (Button)findViewById(R.id.btnMinus);
        btnDevide = (Button)findViewById(R.id.btnDevide);
        btnMulitiply = (Button)findViewById(R.id.btnMulitiply);
        txtNewResult = (TextView)findViewById(R.id.txtNewResult);

/*
yellow: -10752
blue: -16776961
grey: -13291215
sky: -13611010
red: -2818048
 */

        yellow = ContextCompat.getColor(MainActivity.this, R.color.yellow);
      //  btnMinus.setBackgroundColor(-10752);

        blue = Color.BLUE;
       // btnDevide.setBackgroundColor(-16776961);


        grey = Color.parseColor("#353131");
       // btnPlus.setBackgroundColor(-13291215);


        sky = 0xFF304FFE;
       // btnMinus.setBackgroundColor(-2818048);

        red = Color.rgb(213,0,0);
       // btnMulitiply.setBackgroundColor(-2818048);


        System.out.println("yellow: "+yellow+"\nblue: "+blue+"\ngrey: "+grey
        +"\nsky: "+sky+"\nred: "+red);


        btnPlus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //changeColorBtnColor(btnPlus);
                changeColorBtnPlus ();
                String a = getTextFromEditText(etOne);

                if (a == null) {

                    return;
                }

                String b = getTextFromEditText(etTwo);

                if (b == null) {
                    return;
                }

                float c = stringToFloat(a);
                float d = stringToFloat(b);

                float e = resultAddFloat(c, d);

               String formatted =  new DecimalFormat("#.####").format(e);
                tvResult.setText("" + formatted);
                txtNewResult.setText("" + formatted);


            }
        });

        btnMinus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


               // changeColorBtnColor(btnMinus);
                changeColorBtnMinus();

                String a = getTextFromEditText(etOne);

                if (a == null) {

                    return;
                }

                String b = getTextFromEditText(etTwo);

                if (b == null) {
                    return;
                }

                float c = stringToFloat(a);
                float d = stringToFloat(b);


                minus(c, d, tvResult);
                minus(c, d, txtNewResult);


            }
        });

        btnDevide.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

              //changeColorBtnColor(btnDevide);
                changeColorBtnDevide();
                String a = getTextFromEditText(etOne);

                if (a == null) {

                    return;
                }

                String b = getTextFromEditText(etTwo);

                if (b == null) {
                    return;
                }

                float c = stringToFloat(a);
                float d = stringToFloat(b);

                float p = divide( c, d );

                System.out.println("Divide Section: before Formatted : "+ p );

                String formatted =  new DecimalFormat("#.####").format(p);

                System.out.println("Divide Section: after Formatted : "+ formatted );

                tvResult.setText(""+formatted );
                txtNewResult.setText(""+formatted);

            }
        });

        btnMulitiply.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

              //  changeColorBtnColor(btnMulitiply);

                changeColorBtnMultiply();

                String a = getTextFromEditText(etOne);

                if (a == null) {

                    return;
                }

                String b = getTextFromEditText(etTwo);

                if (b == null) {
                    return;
                }

                float c = stringToFloat(a);
                float d = stringToFloat(b);

                multiply (c, d, tvResult );
                multiply (c, d, txtNewResult );

            }
        });

    }

    void changeColorBtnColor(Button btn){

        btnPlus.setBackgroundColor(grey);
        btnMinus.setBackgroundColor(grey);
        btnDevide.setBackgroundColor(grey);
        btnMulitiply.setBackgroundColor(grey);

        btn.setBackgroundColor(red);
    }

    void changeColorBtnPlus (){
        btnPlus.setBackgroundColor(red);
        btnMinus.setBackgroundColor(grey);
        btnDevide.setBackgroundColor(grey);
        btnMulitiply.setBackgroundColor(grey);
    }




    void changeColorBtnMinus (){

        btnPlus.setBackgroundColor(grey);
        btnMinus.setBackgroundColor(red);
        btnDevide.setBackgroundColor(grey);
        btnMulitiply.setBackgroundColor(grey);
    }



    void changeColorBtnDevide (){

        btnPlus.setBackgroundColor(grey);
        btnMinus.setBackgroundColor(grey);
        btnDevide.setBackgroundColor(red);
        btnMulitiply.setBackgroundColor(grey);
    }


    void changeColorBtnMultiply (){

        btnPlus.setBackgroundColor(grey);
        btnMinus.setBackgroundColor(grey);
        btnDevide.setBackgroundColor(grey);
        btnMulitiply.setBackgroundColor(red);
    }

    void  multiply (float a , float b, TextView txtResult ){

        float c = a*b ;
        String formatted =  new DecimalFormat("#.####").format(c);

        txtResult.setText(""+formatted );

    }


    float divide (float n, float m ){

        float x = n/m;

        return  x ;
    }



    void minus (float a , float b, TextView txtResult ){

        float c = a - b;

        String formatted =  new DecimalFormat("#.####").format(c);

        txtResult.setText(""+formatted);

    }

    boolean isIntegerCharacter(String s) {

        int c = -1;

        try {
            c = Integer.parseInt(s);
            return true;
        } catch (NumberFormatException e) {
            return false;
        }
    }

    float stringToFloat(String s) {
        return Float.parseFloat(s);
    }


    float resultAddFloat(float a, float b) {
        return a + b;
    }


    String getTextFromEditText(EditText editText) {
        String s = editText.getText().toString();

        if (TextUtils.isEmpty(s)) {
            editText.setError("Empty");
            return null;
        } else {
            editText.setError(null);
            return s;
        }

    }


}

Xml Part :

<?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"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:layout_margin="16dp"

    >



    <EditText
        android:hint="number One...."
        android:layout_marginTop="25dp"
        android:id="@+id/etOne"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="numberDecimal"/>

    <EditText
        android:hint="number two..."
        android:layout_marginTop="25dp"
        android:id="@+id/etTwo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="numberDecimal"/>


    <TextView
        android:textSize="25dp"
        android:textColor="@color/purple_700"
        android:layout_marginTop="20dp"
        android:id="@+id/tvResult"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Result..."
        />


   <LinearLayout
       android:layout_marginTop="25dp"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal"
       android:weightSum="4">

       <Button
           android:layout_weight="1"
           android:id="@+id/btnPlus"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:text="+"
           android:backgroundTint="@color/grey"/>

       <Button
           android:layout_marginLeft="2dp"
           android:id="@+id/btnMinus"
           android:layout_weight="1"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:text="-"
           android:backgroundTint="@color/grey"/>

       <Button
           android:layout_marginLeft="2dp"
           android:id="@+id/btnDevide"
           android:layout_weight="1"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:text="/"
           android:backgroundTint="@color/grey"/>


       <Button
           android:layout_marginLeft="2dp"
            android:layout_weight="1"
           android:id="@+id/btnMulitiply"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:text="x"
           android:backgroundTint="@color/grey"/>

   </LinearLayout>



    <LinearLayout
        android:layout_marginTop="25dp"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal"
        android:weightSum="4">

        <TextView
            android:background="@color/my_color_red"
            android:layout_width="0dp"
            android:layout_weight="3"
            android:text="Final Resul"
            android:gravity="center"
            android:textColor="@color/white"
            android:layout_height="match_parent"/>

        <TextView
            android:id="@+id/txtNewResult"
            android:background="@color/my_color_green"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:gravity="center"
            android:textColor="@color/white"
            android:text="value"
            android:layout_height="match_parent"/>

    </LinearLayout>










</LinearLayout>

Color.xml :

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="purple_200">#FFBB86FC</color>
    <color name="purple_500">#FF6200EE</color>
    <color name="purple_700">#FF3700B3</color>
    <color name="teal_200">#FF03DAC5</color>
    <color name="teal_700">#FF018786</color>
    <color name="black">#FF000000</color>
    <color name="white">#FFFFFFFF</color>


    <color name="my_color_red">#B81059</color>

    <color name="my_color_green">#06A120</color>


    <color name="yellow">#FFD600</color>

    <color name="sky">#304FFE</color>

    <color name="blue">#070F40</color>

    <color name="grey">#353131</color>

    <color name="red">#D50000</color>


</resources>

Android Programming

Part 9 : Working with Colors and Color Algorithm.

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