=== 8. Edit Contact ===== '''8.1 Create Edit Layout '''<br/>and Menu Item=== 8.1.1 Add the String value for the layout title to String.xml:<br/> <source lang="java"> <string name="editContact_textView">Edit Contact</string> </source> 8.1.2 Right click on layout -> New -> Android XML File .<br/> 8.1.3 Enter edit.xml for the file name and check Layout:<br/> 8.1.4 Using Linear Layout, create this layout for editing contact information:<br/> [[Image: editContactLayout.png | 250px]]<br/> 8.1.5 Here is the edit.xml implementation: <source lang="java"> <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

</LinearLayout></source>8.1.6 Now Add the Edit menu Item. for this purpose click on menu.xml and brouse to the xml view, and add the menu item. Here is how it looks like:<source lang="java"><?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/item1" android:title="Add Student"></item> <item android:id="@+id/item2" android:title="Delete Student"></item> <item android:id="@+id/item3" android:title="View Student"></item> <item android:id="@+id/item4" android:title="Edit Student"></item> <item android:id="@+id/item5" android:title="Send E-mail"></item></menu></source>  8.1.. Now build your project so that the ids are generated in R.java ===8.2 Create EditContactActivity===8.2.1 Create the EditContactActivity in your package and make sure it extends Activity class.<source lang="java">package cs.ecl.team1.android; import android.app.Activity;public class AddContactActivity extends Activity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); }}</source> 8.2.2 Add private fields:<source lang="java"> private String firstName; private String lastName; private String email;</source>8.2.3 Make sure that on creation it adds the edit layout to the view, so change the OnCreate method:<source lang="java">@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.edit); // adds edit layout to view }}</source>8.2.4 get the Intent of this Activity (later when starting this activity, we will send an Intent including the data of the selected student for editing). Then read he data from it and set the EditTexts values:<source lang="java">@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.edit); // adds edit layout to view  Intent i = this.getIntent(); // get this page intent  // read the data from the Intent EditText fNameEditText = (EditText) findViewById(R.id.firstNameEdit); fNameEditText.setText(i.getStringExtra("oldFirstName")); EditText lNameEditText = (EditText) findViewById(R.id.lastNameEdit); lNameEditText.setText(i.getStringExtra("oldLastName")); EditText emailEditText = (EditText) findViewById(R.id.emailEdit); emailEditText.setText(i.getStringExtra("oldEmail"));   }}</source>

'''8.2 Create EditContactActivity '''<br/>.5 Add and implement the save button: in the OnCreate method:

'''<source lang="java"> //save Button implementation Button saveButton = (Button) findViewById(R.id.saveContact_buttonEdit); saveButton.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { firstName = ((EditText) findViewById(R.id.firstNameEdit)).getText().toString(); lastName = ((EditText) findViewById(R.id.lastNameEdit)).getText().toString(); email = ((EditText) findViewById(R.id.emailEdit)).getText().toString(); finish(); } });</source> 8.3.5 Now you need to override the finish() method:<source lang="java">@Override public void finish() { Intent i = new Intent(); if (firstName.equals("") && lastName.equals("") && email.equals("")) { setResult(0); } else { // add the modified data to the intent i.putExtra("newFirstName", firstName); i.putExtra("newLastName", lastName); i.putExtra("newEmail", email); setResult(RESULT_OK, i); } super.finish(); }</source>8.3.6 Here is the completed source of the EditContactActivity:<source lang="java">package cs.ecl.team1.android; import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;  public class EditContactActivity extends Activity { private String firstName; private String lastName; private String email; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.edit); // get the intent sent to this class Intent i = this.getIntent(); EditText fNameEditText = (EditText) findViewById(R.id.firstNameEdit); fNameEditText.setText(i.getStringExtra("oldFirstName")); EditText lNameEditText = (EditText) findViewById(R.id.lastNameEdit); lNameEditText.setText(i.getStringExtra("oldLastName")); EditText emailEditText = (EditText) findViewById(R.id.emailEdit); emailEditText.setText(i.getStringExtra("oldEmail")); //save Button implementation Button saveButton = (Button) findViewById(R.id.saveContact_buttonEdit); saveButton.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { firstName = ((EditText) findViewById(R.id.firstNameEdit)).getText().toString(); lastName = ((EditText) findViewById(R.id.lastNameEdit)).getText().toString(); email = ((EditText) findViewById(R.id.emailEdit)).getText().toString(); finish(); } }); } @Override public void finish() { Intent i = new Intent(); if (firstName.equals("") && lastName.equals("") && email.equals("")) { setResult(0); } else { i.putExtra("newFirstName", firstName); i.putExtra("newLastName", lastName); i.putExtra("newEmail", email); setResult(RESULT_OK, i); } super.finish(); }  } </source> ===8.3 Add the EditContactActivity to the Android Manifest===Now we have to declare our EditContactActivity in the Manifest:open the AndroidManifest.xml and add this:<source lang="java"><activity android:label="Edit Contact" android:name="EditContactActivity"></activity></source> ===8.4 Implement the EditContact in the main activity class===8.4.1 Add the following private fields to the ContactList Activity :<source lang=java> // added for Edit private static final int EDIT_CONTACT =1; private Student selectedStudent; </source> 8.4.2 In the onOptionsItemSelected(MenuItem item) method add the following case to the switch code block: <source lang="java">case R.id.item4:// Edit // set the private field :selectedStudent so that it can be accessed later selectedStudent = (Student)contactsList.getSelectedItem(); // create an Intent for EditContactActivity class Intent j = new Intent(this, EditContactActivity.class); // add the selected student'''s data to the intent so that the EditContactActivity class can read them j.putExtra("oldFirstName",selectedStudent.getFirstname()); j.putExtra("oldLastName", selectedStudent.getLastName()); j.putExtra("oldEmail",selectedStudent.getEmail()); // Start the EditContactActivity activity startActivityForResult(j, EDIT_CONTACT); break; <br/source>8.4.3 Modify the onActivityResult() method to accommodate the results of the EditContactActivity. Here is the completed code if this method: <source lang="java">@Override protected void onActivityResult(int requestCode, int resultCode, Intent intent) {// modified to implement Edit switch (requestCode){ case CREATE_CONTACT: // Add new Contact if (resultCode == Activity.RESULT_OK) { studentList.addElement(new Student(intent.getExtras().getString("firstName"), intent.getExtras().getString("lastName"), intent.getExtras().getString("email"))); } else { showDialog("No contact was added!"); } displayData(studentList); break; case EDIT_CONTACT: // edit the selected Student // implement Edit if (resultCode == Activity.RESULT_OK) { Student oldS = selectedStudent; Student newS= new Student(intent.getExtras().getString("newFirstName"), intent.getExtras().getString("newLastName"), intent.getExtras().getString("newEmail")); for(int i = 0; i< studentList.size() ; i++){ Student s= (Student)studentList.elementAt(i); if (s.getName().compareTo(oldS.getName())==0 && s.getEmail().compareTo(s.getEmail())==0){ studentList.remove(s); studentList.add(newS); } } } else { showDialog("No contact was edited!"); } displayData(studentList); break; default: break; } }

'''8.4 Implement The EditContact in the main activity class'''<br/source>

'''===8.5 Edit Contact In action ===8.5.1 Build and run the project. Scrole mous buton to select a contact, and then click on the menu button of the virtual device. and then click on the EditContact menu option. Please note that the selected contact seems unselected but it'''s ok:<br/>