用Android studio写一个通讯录实现三个页面的跳转

1. 首先，创建一个新的Android Studio项目。 2. 在项目中创建三个Activity，分别为ContactsActivity、AddContactActivity和EditContactActivity。 3. 在ContactsActivity中，可以显示所有的联系人列表，并提供一个按钮用于添加新的联系人。当用户点击添加按钮时，应该跳转到AddContactActivity页面。 4. 在AddContactActivity中，用户可以输入新的联系人的信息，并保存这些信息。当用户保存联系人信息时，应该返回到ContactsActivity页面，并刷新联系人列表。 5. 在ContactsActivity中，每个联系人都应该有一个编辑按钮。当用户点击编辑按钮时，应该跳转到EditContactActivity页面，允许用户编辑该联系人的详细信息。 6. 在EditContactActivity中，用户可以编辑联系人的详细信息，并保存这些信息。当用户保存联系人信息时，应该返回到ContactsActivity页面，并刷新联系人列表。 7. 在AndroidManifest.xml中配置三个Activity的跳转。 示例代码： ContactsActivity.java ``` public class ContactsActivity extends AppCompatActivity { private Button addButton; private ListView contactsListView; private ArrayList<Contact> contactsList; private ContactsAdapter contactsAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_contacts); addButton = findViewById(R.id.add_button); contactsListView = findViewById(R.id.contacts_list_view); contactsList = new ArrayList<>(); contactsAdapter = new ContactsAdapter(this, contactsList); contactsListView.setAdapter(contactsAdapter); addButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intent = new Intent(ContactsActivity.this, AddContactActivity.class); startActivityForResult(intent, 1); } }); contactsListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { Intent intent = new Intent(ContactsActivity.this, EditContactActivity.class); intent.putExtra("contact", contactsList.get(i)); startActivityForResult(intent, 2); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == RESULT_OK) { if (requestCode == 1) { Contact contact = (Contact) data.getSerializableExtra("contact"); contactsList.add(contact); contactsAdapter.notifyDataSetChanged(); } else if (requestCode == 2) { Contact contact = (Contact) data.getSerializableExtra("contact"); int position = data.getIntExtra("position", -1); if (position != -1) { contactsList.set(position, contact); contactsAdapter.notifyDataSetChanged(); } } } } } ``` AddContactActivity.java ``` public class AddContactActivity extends AppCompatActivity { private Button saveButton; private EditText nameEditText; private EditText phoneEditText; private EditText emailEditText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_add_contact); saveButton = findViewById(R.id.save_button); nameEditText = findViewById(R.id.name_edit_text); phoneEditText = findViewById(R.id.phone_edit_text); emailEditText = findViewById(R.id.email_edit_text); saveButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { String name = nameEditText.getText().toString(); String phone = phoneEditText.getText().toString(); String email = emailEditText.getText().toString(); Contact contact = new Contact(name, phone, email); Intent intent = new Intent(); intent.putExtra("contact", contact); setResult(RESULT_OK, intent); finish(); } }); } } ``` EditContactActivity.java ``` public class EditContactActivity extends AppCompatActivity { private Button saveButton; private EditText nameEditText; private EditText phoneEditText; private EditText emailEditText; private Contact contact; private int position; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_edit_contact); saveButton = findViewById(R.id.save_button); nameEditText = findViewById(R.id.name_edit_text); phoneEditText = findViewById(R.id.phone_edit_text); emailEditText = findViewById(R.id.email_edit_text); contact = (Contact) getIntent().getSerializableExtra("contact"); position = getIntent().getIntExtra("position", -1); if (contact != null) { nameEditText.setText(contact.getName()); phoneEditText.setText(contact.getPhone()); emailEditText.setText(contact.getEmail()); } saveButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { String name = nameEditText.getText().toString(); String phone = phoneEditText.getText().toString(); String email = emailEditText.getText().toString(); Contact updatedContact = new Contact(name, phone, email); Intent intent = new Intent(); intent.putExtra("contact", updatedContact); intent.putExtra("position", position); setResult(RESULT_OK, intent); finish(); } }); } } ``` AndroidManifest.xml ``` <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.contacts"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".ContactsActivity" /> <activity android:name=".AddContactActivity" /> <activity android:name=".EditContactActivity" /> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> ```