- 添加时间
- 搜索功能
- 更改背景颜色
首先,由于看不惯黑色背景,于是将NoteList的颜色修改与NoteEditor一致: 在AndroidManifest.xml中添加
android:theme="@android:style/Theme.Holo.Light"
- 先在noteslist_item中添加能够显示时间的TextView:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="wrap_content" > <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/text1" android:layout_width="match_parent" android:layout_height="?android:attr/listPreferredItemHeight" android:textAppearance="?android:attr/textAppearanceLarge" android:gravity="center_vertical" android:paddingLeft="5dip" android:singleLine="true" /> <TextView android:id="@+id/date" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:gravity="center_vertical" android:paddingLeft="5dip" android:textColor="#708090" android:textSize="20dp" android:singleLine="true"/> </LinearLayout>
- 修改notelist.java 的PROJECTION
private static final String[] PROJECTION = new String[] { NotePad.Notes._ID, // 0 NotePad.Notes.COLUMN_NAME_TITLE, // 1 NotePad.Notes.COLUMN_NAME_CREATE_DATE };
- 修改dataColumns和viewID相关的值
String[] dataColumns = { NotePad.Notes.COLUMN_NAME_TITLE ,NotePad.Notes.COLUMN_NAME_CREATE_DATE} ;
int[] viewIDs = { android.R.id.text1 ,R.id.date};
- 向NotePadProvider数据存储中添加时间值
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy-MM-dd HH:mm:ss"); Date curDate = new Date(System.currentTimeMillis()); String date = formatter.format(curDate); values.put(NotePad.Notes.COLUMN_NAME_CREATE_DATE,date);
功能实现后如下图所示:
- 首先在list_options_menu.xml中添加一个搜索的选项:
<menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/menu_search" android:icon="@drawable/search1" android:title="@string/menu_add" android:alphabeticShortcut="s" android:showAsAction="always" /> <!-- This is our one standard application action (creating a new note). --> <item android:id="@+id/menu_add" android:icon="@drawable/ic_menu_compose" android:title="@string/menu_add" android:alphabeticShortcut='a' android:showAsAction="always" /> <!-- If there is currently data in the clipboard, this adds a PASTE menu item to the menu so that the user can paste in the data.. --> <item android:id="@+id/menu_paste" android:icon="@drawable/ic_menu_compose" android:title="@string/menu_paste" android:alphabeticShortcut='p' /> </menu>
- 创建一个SearchView成员变量
private SearchView searchView;
- 写一个设置SearchView的方法
private void setSearchView(Menu menu) { //1.找到menuItem并动态设置SearchView MenuItem item = menu.getItem(0); searchView = new SearchView(this); item.setActionView(searchView); //2.设置搜索的背景为白色 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { item.collapseActionView(); } searchView.setQuery("", false); //searchView.setBackgroundResource(R.drawable.ic_menu_edit); //3.设置为默认展开状态,图标在外面 searchView.setIconifiedByDefault(true); searchView.setQueryHint("Search"); searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() { @Override public boolean onQueryTextSubmit(String query) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { searchView.onActionViewCollapsed(); } return false; } @Override public boolean onQueryTextChange(String newText) { if (!TextUtils.isEmpty(newText)) { Cursor cursor = managedQuery( getIntent().getData(), // Use the default content URI for the provider. PROJECTION, // Return the note ID and title for each note. NotePad.Notes.COLUMN_NAME_TITLE + " LIKE '%" + newText + "%' ", // 相当于where语句 null, // No where clause, therefore no where column values. NotePad.Notes.DEFAULT_SORT_ORDER // Use the default sort order. ); final String[] dataColumn = {NotePad.Notes.COLUMN_NAME_CREATE_DATE, NotePad.Notes.COLUMN_NAME_TITLE}; // The view IDs that will display the cursor columns, initialized to the TextView in // noteslist_item.xml int[] viewID = {R.id.date,android.R.id.text1}; SimpleCursorAdapter adapter1 = new SimpleCursorAdapter( NotesList.this, // The Context for the ListView R.layout.noteslist_item, // Points to the XML for a list item cursor, // The cursor to get items from dataColumn, viewID ); //重新setListAdapter setListAdapter(adapter1); } else { //恢复默认setListAdapter setListAdapter(adapter); } return false; } }); }
onQueryTextChange是监听搜索框的方法,根据输入文字改变SimpleCursorAdapter界面
- 在onCreateOptionsMenu中添加setSearchView方法
public boolean onCreateOptionsMenu(Menu menu) { // Inflate menu from XML resource MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.list_options_menu, menu); setSearchView(menu); // Generate any additional actions that can be performed on the // overall list. In a normal install, there are no additional // actions found here, but this allows other applications to extend // our menu with their own actions. Intent intent = new Intent(null, getIntent().getData()); intent.addCategory(Intent.CATEGORY_ALTERNATIVE); menu.addIntentOptions(Menu.CATEGORY_ALTERNATIVE, 0, 0, new ComponentName(this, NotesList.class), null, intent, 0, null); return super.onCreateOptionsMenu(menu); }
实现后界面如下:
- 先在NoteList的菜单栏里添加一个改变背景颜色的选项
在list_option_menu中添加:
<item android:id="@+id/bg" android:title="Background" android:alphabeticShortcut="b" />
效果如图:
- 创建一个用来显示颜色选择的布局color.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="100dp"> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:background="#E1FFFF" android:id="@+id/LightCyan" android:clickable="true" android:layout_weight="1"/> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:background="#FFC0CB" android:id="@+id/Pink" android:layout_weight="1"/> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:background="#87CEFA" android:id="@+id/LightSkyBlue" android:layout_weight="1"/> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:background="#F8F8FF" android:id="@+id/GhostWhite" android:layout_weight="1"/> </LinearLayout>
- 使用SharedPreferences来保存之前设置的颜色,在下次启动应用时设置
创建一个SharedPreferences变量和存储颜色的变量:
private SharedPreferences bg; private String preferencescolor;
使用SharedPreferences保存颜色的方法:
private void putColor(String color){ SharedPreferences preferences = getSharedPreferences("preferences", Context.MODE_PRIVATE); SharedPreferences.Editor editor = preferences.edit(); editor.putString("color", color); editor.commit(); }
在onCreate方法中设置,如果之前有设置过颜色,启动时应用,没有则使用默认颜色:
bg = getSharedPreferences("preferences", Context.MODE_PRIVATE); preferencescolor=bg.getString("color", ""); //设置Listview的背景色 if(preferencescolor.equals("")){ getListView().setBackgroundColor(Color.parseColor("#FFFFFF")); } else { getListView().setBackgroundColor(Color.parseColor(preferencescolor)); }
- 在onOptionItemSelected方法中设置Background的响应事件
public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_add: /* * Launches a new Activity using an Intent. The intent filter for the Activity * has to have action ACTION_INSERT. No category is set, so DEFAULT is assumed. * In effect, this starts the NoteEditor Activity in NotePad. */ startActivity(new Intent(Intent.ACTION_INSERT, getIntent().getData())); return true; case R.id.menu_paste: /* * Launches a new Activity using an Intent. The intent filter for the Activity * has to have action ACTION_PASTE. No category is set, so DEFAULT is assumed. * In effect, this starts the NoteEditor Activity in NotePad. */ startActivity(new Intent(Intent.ACTION_PASTE, getIntent().getData())); return true; //Background的点击事件 case R.id.bg: final AlertDialog alertDialog = new AlertDialog.Builder(NotesList.this).create(); alertDialog.show(); Window window = alertDialog.getWindow(); window.setContentView(R.layout.color); TextView color_LightCyan = (TextView)alertDialog.getWindow().findViewById(R.id.LightCyan); TextView color_Pink = (TextView)alertDialog.getWindow().findViewById(R.id.Pink); TextView color_LightSkyBlue = (TextView)alertDialog.getWindow().findViewById(R.id.LightSkyBlue); TextView color_GhostWhite = (TextView)alertDialog.getWindow().findViewById(R.id.GhostWhite); color_LightCyan.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { preferencescolor="#E1FFFF"; getListView().setBackgroundColor(Color.parseColor(preferencescolor)); putColor(preferencescolor); alertDialog.dismiss(); } }); color_Pink.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { preferencescolor="#FFC0CB"; getListView().setBackgroundColor(Color.parseColor(preferencescolor)); putColor(preferencescolor); alertDialog.dismiss(); } }); color_LightSkyBlue.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { preferencescolor="#87CEFA"; getListView().setBackgroundColor(Color.parseColor(preferencescolor)); putColor(preferencescolor); alertDialog.dismiss(); } }); color_GhostWhite.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { preferencescolor="#F8F8FF"; getListView().setBackgroundColor(Color.parseColor(preferencescolor)); putColor(preferencescolor); alertDialog.dismiss(); } }); return true; default: return super.onOptionsItemSelected(item); } }
alertDialog是用来显示刚才创建color.xml;然后给每个颜色设置点击事件,将色值传给preferencescolor并设置为背景
实现后如下图:
