Android-ToDoList(fragment)详解
ToDoList(fragment) 详解
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本文地址: http://blog.csdn.net/caroline_wendy/article/details/21246963
ToDoList做为Android的经典练习, 参考: http://blog.csdn.net/caroline_wendy/article/details/21223995
Fragment(碎片) 可以灵活地从一个活动的Activity上添加或删除Fragment, 有良好的用户体验;
下面是Fragment的具体设计:
1. 创建new_item_fragment的资源文件:
位置: res->new_item_fragment.xml
包含一个EditText控件;
2. 创建NewItemFragment的逻辑实现:
位置: java->package->NewItemFragment.java
package mzx.spike.todolist.app; import android.app.Activity; import android.app.Fragment; import android.os.Bundle; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.EditText; /** * Created by C.L.Wang on 14-3-14. */ public class NewItemFragment extends Fragment{ private OnNewItemAddedListener onNewItemAddedListener; //监听事件 public interface OnNewItemAddedListener { public void onNewItemAdded(String newItem); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.new_item_fragment, container, false); final EditText myEditText = (EditText)view.findViewById(R.id.myEditText); //监听事件 myEditText.setOnKeyListener(new View.OnKeyListener() { @Override public boolean onKey(View view, int i, KeyEvent keyEvent) { if (keyEvent.getAction() == KeyEvent.ACTION_DOWN) if ((i == KeyEvent.KEYCODE_DPAD_CENTER) || (i == KeyEvent.KEYCODE_ENTER)) { String newItem = myEditText.getText().toString(); onNewItemAddedListener.onNewItemAdded(newItem); myEditText.setText(""); return true; } return false; } }); return view; } //绑定到Activity public void onAttach(Activity activity) { super.onAttach(activity); try { onNewItemAddedListener = (OnNewItemAddedListener)activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnNewItemAddedListener"); } } }
详解:
1. 继承Fragment类;
2. 监听接口(interface OnNewItemListener), 包含一个监听方法(onNewItemAdded), 然后实现一个实例;
3. 创建视图(onCreateView), 需要返回一个视图(View);
4. 填充一个视图, 调用inflater.inflate()函数, 绑定fragment的资源文件;
5. 获得控件的引用, view.findViewById(), 得到myEditText的引用;
6. 监听事件, 监听myEditText的输入内容, 传递给接口的内容(new Item);
7. 使用onAttach()函数, 绑定Acitivity之后, 获得activity的引用;
3. 创建ToDoListFragment的逻辑实现:
位置: java->package->ToDoListFragment.java
package mzx.spike.todolist.app; import android.app.ListFragment; /** * Created by C.L.Wang on 14-3-14. */ public class ToDoListFragment extends ListFragment{ }
继承ListFragment;
4. 创建activity_to_do_list资源文件, 即Activity资源文件:
位置: res->layout->activity_to_do_list.xml
LinearLayout包含两个fragment结点, 需要提供android:name的参数, 实现;
5. 创建ToDoListActivityt的逻辑实现, 即Activity的逻辑实现:
位置: java->package->ToDoListActivityt.java
package mzx.spike.todolist.app; import android.app.FragmentManager; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.view.Menu; import android.view.MenuItem; import android.widget.ArrayAdapter; import java.util.ArrayList; public class ToDoListActivity extends ActionBarActivity implements NewItemFragment.OnNewItemAddedListener { private ArrayAdapteraa; private ArrayList toDoItems; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_to_do_list); //获得fragment的引用 FragmentManager fm = getFragmentManager(); ToDoListFragment toDoListFragment = (ToDoListFragment)fm.findFragmentById(R.id.ToDoListFragment); toDoItems = new ArrayList (); //三个参数 aa = new ArrayAdapter (this, android.R.layout.simple_list_item_1, toDoItems); toDoListFragment.setListAdapter(aa); } //重写了接口的方法 public void onNewItemAdded(String newItem) { toDoItems.add(newItem); aa.notifyDataSetChanged(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.to_do_list, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }
详解:
1. 继承监听接口(OnNewItemAddedListener);
2. ArrayList类型数据, 和适配器(ArrayAdapter);
3. 通过findFragmentById(), 获得ToDoListFragment的引用;
4. 把toDoItem绑定适配器, ToDoListFragment设置适配器(setListAdapter);
5. 实现接口的方法, 传递至toDoItems, 通知适配器更改(notifyDataSetChanged);
6. 执行程序:
其他文件参考: http://blog.csdn.net/caroline_wendy/article/details/21223995
下载地址: http://download.csdn.net/detail/u012515223/7042137
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