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本文地址: http://blog.csdn.net/caroline_wendy/article/details/21246963
ToDoList做為Android的經(jīng)典練習(xí), 參考: http://blog.csdn.net/caroline_wendy/article/details/21223995
Fragment(碎片) 可以靈活地從一個(gè)活動(dòng)的Activity上添加或刪除Fragment, 有良好的用戶體驗(yàn);
下面是Fragment的具體設(shè)計(jì):
位置: res->new_item_fragment.xml
<?xml version="1.0" encoding="utf-8"?> <EditText xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/myEditText" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/addItemHint" android:contentDescription="@string/addItemContentDescription" />
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; //監(jiān)聽事件 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); //監(jiān)聽事件 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; } //綁定到Activity public void onAttach(Activity activity) { super.onAttach(activity); try { onNewItemAddedListener = (OnNewItemAddedListener)activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnNewItemAddedListener"); } } }
1. 繼承Fragment類;
2. 監(jiān)聽接口(interface OnNewItemListener), 包含一個(gè)監(jiān)聽方法(onNewItemAdded), 然后實(shí)現(xiàn)一個(gè)實(shí)例;
3. 創(chuàng)建視圖(onCreateView), 需要返回一個(gè)視圖(View);
4. 填充一個(gè)視圖, 調(diào)用inflater.inflate()函數(shù), 綁定fragment的資源文件;
5. 獲得控件的引用, view.findViewById(), 得到myEditText的引用;
6. 監(jiān)聽事件, 監(jiān)聽myEditText的輸入內(nèi)容, 傳遞給接口的內(nèi)容(new Item);
7. 使用onAttach()函數(shù), 綁定Acitivity之后, 獲得activity的引用;
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{ }
位置: res->layout->activity_to_do_list.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context="mzx.spike.todolist.app.ToDoListActivity"> <fragment android:name="mzx.spike.todolist.app.NewItemFragment" android:id="@+id/NewItemFragment" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="@string/addItemHint" android:contentDescription="@string/addItemContentDescription" /> <fragment android:name="mzx.spike.todolist.app.ToDoListFragment" android:id="@+id/ToDoListFragment" android:layout_width="match_parent" android:layout_height="wrap_content" /> </LinearLayout>
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 ArrayAdapter<String> aa; private ArrayList<String> toDoItems; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_to_do_list); //獲得fragment的引用 FragmentManager fm = getFragmentManager(); ToDoListFragment toDoListFragment = (ToDoListFragment)fm.findFragmentById(R.id.ToDoListFragment); toDoItems = new ArrayList<String>(); //三個(gè)參數(shù) aa = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, toDoItems); toDoListFragment.setListAdapter(aa); } //重寫了接口的方法 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); } }
1. 繼承監(jiān)聽接口(OnNewItemAddedListener);
2. ArrayList類型數(shù)據(jù), 和適配器(ArrayAdapter);
3. 通過findFragmentById(), 獲得ToDoListFragment的引用;
4. 把toDoItem綁定適配器, ToDoListFragment設(shè)置適配器(setListAdapter);
5. 實(shí)現(xiàn)接口的方法, 傳遞至toDoItems, 通知適配器更改(notifyDataSetChanged);
其他文件參考: http://blog.csdn.net/caroline_wendy/article/details/21223995
下載地址: http://download.csdn.net/detail/u012515223/7042137
網(wǎng)站名稱:Android-ToDoList(fragment)詳解
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