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>