title: Convert RGB to HEX programatically - Android
body: <p>So Im making an app that converts RGB Colors to Hexadecimal (ex. #FFFFFF). I have three edittext for Red, Green and Blu. When I input values for every edittext like (255,255,255) and I click the button the RGB values will be converted to Hexadecimal and will be shown in textview. Can someone help me with the computation here is my codes.</p>
  
  <pre><code>public class MainActivity extends Activity {
  
      public String str = "";
  
      int i, num, numtemp;
      EditText showRed, showGreen, showBlue;
      String displayStr = "";
      Button zero, one, two, three, four, five, six, seven, eight, nine, clear, convert;
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
  
          showRed = (EditText) findViewById(R.id.red);
          showGreen = (EditText) findViewById(R.id.green);
          showBlue = (EditText) findViewById(R.id.blue);
  
          clear = (Button) findViewById(R.id.clear);
          convert = (Button) findViewById(R.id.convert);
  
          convert.setOnClickListener(new OnClickListener() {
              @Override
              public void onClick(View arg0) {
                  //Convertion Computaion here HELP!!!!!!!!!
              }
          });
  
          clear.setOnClickListener(new OnClickListener() {
              @Override
              public void onClick(View arg0) {
  
                  str = "";
                  num = 0;
                  numtemp = 0;
  
                  showRed.setText("");
                  showRed.requestFocus();
                  showGreen.setText("");
                  showBlue.setText("");
                  displayStr = "";
              }
          });
      }
  
      public void btn1Clicked(View v) {
          insert(1);
      }
  
      public void btn2Clicked(View v) {
          insert(2);
      }
  
      public void btn3Clicked(View v) {
          insert(3);
      }
  
      public void btn4Clicked(View v) {
          insert(4);
      }
  
      public void btn5Clicked(View v) {
          insert(5);
      }
  
      public void btn6Clicked(View v) {
          insert(6);
      }
  
      public void btn7Clicked(View v) {
          insert(7);
      }
  
      public void btn8Clicked(View v) {
          insert(8);
      }
  
      public void btn9Clicked(View v) {
          insert(9);
      }
  
      public void btn0Clicked(View v) {
          insert(0);
      }
  
      private void insert(int j) {
          // TODO Auto-generated method stub
  
          if (showRed.hasFocus()) {
              str = str + Integer.toString(j);
              num = Integer.valueOf(str).intValue();
              displayStr += Integer.toString(j);
  
              showRed.setText(displayStr);
  
              if ((showRed.length() == 3)) {
                  displayStr = "";
                  showGreen.requestFocus();
              }
          } else if (showGreen.hasFocus()) {
  
              str = str + Integer.toString(j);
              num = Integer.valueOf(str).intValue();
              displayStr += Integer.toString(j);
  
              showGreen.setText(displayStr);
  
              if ((showGreen.length() == 3)) {
                  displayStr = "";
                  showBlue.requestFocus();
              }
          } else if (showBlue.hasFocus()) {
              str = str + Integer.toString(j);
              num = Integer.valueOf(str).intValue();
              displayStr += Integer.toString(j);
  
              showBlue.setText(displayStr);
  
              if ((showBlue.length() == 3)) {
                  displayStr = "";
                  showBlue.clearFocus();
              }
          }
      }
  }
  </code></pre>