title: How to save previous selected radio button state and also always in first selected state when application exit and launched?
body: <p>When I click a button, it displays pop up dialog which has five radio buttons. Now requirements are</p>
  
  <ol>
  <li>When I launch and click button,pop up dialog displays initially with first radio button which should be in checked state while others are in unchecked state.</li>
  <li>When user changes by selecting the next radio button,dismiss the dialog and once again if user open pop up means,it should be in previous selected state.</li>
  </ol>
  
  <p>How to proceed with this?</p>
  
  <p>Code is as follows:</p>
  
  <pre><code>public class PopUpDialogRadioButton extends Activity {
      private Button popUpClick;
      private Dialog dialog;
      private RadioGroup radioGroup;
      private RadioButton radioButton1, radioButton2, radioButton3, radioButton4, radioButton5;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
      this.requestWindowFeature(Window.FEATURE_NO_TITLE);
      setContentView(R.layout.sortfilterclick);
      popUpClick = (Button) findViewById(R.id.popupButton); // on click of button, opens a pop up dialog
      popUpClick.setOnClickListener(new OnClickListener() {
  
          @Override
          public void onClick(View v) {
              // TODO Auto-generated method stub
  
              dialog = new Dialog(PopUpDialogRadioButton.this);
              dialog.setContentView(R.layout.sortfilterrow);
              radioGroup = (RadioGroup) dialog.findViewById(R.id.radioGroup1);
              radioButton1 = (RadioButton) dialog.findViewById(R.id.radio1);
              radioButton2 = (RadioButton) dialog.findViewById(R.id.radio2);
              radioButton3 = (RadioButton) dialog.findViewById(R.id.radio3);
              radioButton4 = (RadioButton) dialog.findViewById(R.id.radio4);
              radioButton5 = (RadioButton) dialog.findViewById(R.id.radio5);
              radioButton1.setOnClickListener(radioButtonOnClickListener);
              radioButton2.setOnClickListener(radioButtonOnClickListener);
              radioButton3.setOnClickListener(radioButtonOnClickListener);
              radioButton4.setOnClickListener(radioButtonOnClickListener);
              radioButton5.setOnClickListener(radioButtonOnClickListener);
              radioGroup.clearCheck();     
              radioButton1.setChecked(true);
              int selectedId = radioGroup.getCheckedRadioButtonId();
              RadioButton osButton = (RadioButton) dialog
                      .findViewById(selectedId);
              StringBuffer responseText = new StringBuffer();
              responseText.append(osButton.getText());
              Toast.makeText(getApplicationContext(), responseText,
                      Toast.LENGTH_SHORT).show();
              // radioGroup.setOnCheckedChangeListener(radioGroupOnCheckedChangeListener);
  
              dialog.setCancelable(true);
              dialog.setTitle("Sort By");
              dialog.show();
          }
  
          private final OnClickListener radioButtonOnClickListener = new OnClickListener() {
  
              @Override
              public void onClick(View v) {
                  // TODO Auto-generated method stub
                  /*
                   * RadioButton rb = (RadioButton) v;
                   * Toast.makeText(SortFilterPopupActivity.this,
                   * rb.getText(), Toast.LENGTH_SHORT).show();
                   */
                  switch (v.getId()) {
                  case R.id.radio1:
                      Toast.makeText(PopUpDialogRadioButton.this, "first",
                              Toast.LENGTH_SHORT).show();
                                              dialog.dismiss();
                      break;
                  case R.id.radio2:
                      Toast.makeText(PopUpDialogRadioButton.this, "two",
                              Toast.LENGTH_SHORT).show();
                                              dialog.dismiss();
                      break;
                  case R.id.radio3:
                      Toast.makeText(PopUpDialogRadioButton.this, "three",
                              Toast.LENGTH_SHORT).show();
                                              dialog.dismiss();
                      break;
                  case R.id.radio4:
                      Toast.makeText(PopUpDialogRadioButton.this, "four",
                              Toast.LENGTH_SHORT).show();
                                          dialog.dismiss();
                      break;
                  case R.id.radio5:
                      Toast.makeText(PopUpDialogRadioButton.this, "five",
                              Toast.LENGTH_SHORT).show();
                      dialog.dismiss();
                      break;
                  }
              }
          };
      });
  }
  </code></pre>