NotePad

This is an AndroidStudio rebuild of google SDK sample NotePad

一 功能扩展如下：

1.增加时间戳显示

2.添加笔记查询功能

3.界面UI美化

4.更改记事本的背景  

二 主界面增加时间戳：

 

在 NoteEditor.java文件中的updateNote中添加

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式     values.put(NotePad.Notes.COLUMN_NAME_MODIFICATION_DATE, df.format(new Date()));

三、点击+,新建note界面，UI美化：

 

   <LinearLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal"

       >
       <EditText
           android:layout_width="match_parent"
           android:layout_height="40dp"
           android:layout_weight="1"
           android:layout_marginLeft="10dp"
           android:textColor="#000000"
           android:id="@+id/et_Search"
           android:hint="输入标题查找"
           android:textCursorDrawable="@drawable/contact_edit_edittext_normal"
           />
       <ImageView
           android:layout_width="30dp"
           android:layout_height="30dp"
           android:background="@drawable/search1"
           android:layout_marginRight="10dp"
           android:layout_marginTop="5dp"
           android:layout_marginLeft="10dp"
           android:id="@+id/iv_searchnotes"
           />
   </LinearLayout>

    <FrameLayout
    android:layout_width="match_parent"
    android:layout_weight="1"
    android:orientation="vertical"
    android:layout_height="wrap_content">
    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:cacheColorHint="#00000000"
        android:divider="#FFFFCC"
        android:dividerHeight="0dp"
        android:id="@id/android:list"
        >
    </ListView>
    <ImageButton
        android:id="@+id/fab"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_gravity="bottom|center"
        android:layout_margin="45dp"
        android:background="@drawable/tianjia"
        android:backgroundTintMode="add"/>

 

 

四、更换主题界面：

 

   public void ColorSelect(View view){
       String color;
       switch(view.getId()){
           case R.id.pink:
               Drawable btnDrawable1 = getResources().getDrawable(R.drawable.pink);
               ll_noteList.setBackgroundDrawable(btnDrawable1);
               lv_notesList.setBackgroundDrawable(btnDrawable1);
               break;
           case R.id.Yello:
               Drawable btnDrawable2 = getResources().getDrawable(R.drawable.yellow);
               ll_noteList.setBackgroundDrawable(btnDrawable2);
               lv_notesList.setBackgroundDrawable(btnDrawable2);
               break;
           case R.id.PaleVioletRed:
               Drawable btnDrawable3 = getResources().getDrawable(R.drawable.palevioletred);
               ll_noteList.setBackgroundDrawable(btnDrawable3);
               lv_notesList.setBackgroundDrawable(btnDrawable3);
               break;
           case R.id.LightGrey:
               Drawable btnDrawable4 = getResources().getDrawable(R.drawable.lightgrey);
               ll_noteList.setBackgroundDrawable(btnDrawable4);
               lv_notesList.setBackgroundDrawable(btnDrawable4);
               break;
           case R.id.MediumPurple:
               Drawable btnDrawable5 = getResources().getDrawable(R.drawable.mediumpurple);
               ll_noteList.setBackgroundDrawable(btnDrawable5);
               lv_notesList.setBackgroundDrawable(btnDrawable5);
               break;
           case R.id.DarkGray:
               Drawable btnDrawable6 = getResources().getDrawable(R.drawable.darkgray);
               ll_noteList.setBackgroundDrawable(btnDrawable6);
               lv_notesList.setBackgroundDrawable(btnDrawable6);
               break;
           case R.id.Snow:
               Drawable btnDrawable7 = getResources().getDrawable(R.drawable.snow);
               ll_noteList.setBackgroundDrawable(btnDrawable7);
               lv_notesList.setBackgroundDrawable(btnDrawable7);
               break;
       }

   }

 

 

 

 

 

五、搜索笔记：

   

使用TextWatcher实现textview输入监听，使用数据库语句like实现模糊查找  

       private void addSearchView() {
           //给listview添加头部(search)
           View v=View.inflate(this, R.layout.notelistheader,null);
           getListView().addHeaderView(v);
           //给搜索框添加搜索功能
           final EditText et_Search=(EditText)v.findViewById(R.id.et_search);
           et_Search.addTextChangedListener(new TextWatcherForSearch(){
           @Override
           public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                   super.onTextChanged(charSequence, i, i1, i2);
                   if (charSequence.length()!=0 && et_Search.getText().toString().length()!=0){
                   String str_Search = et_Search.getText().toString();
                   Cursor search_cursor = managedQuery(
                               getIntent().getData(),            
                               PROJECTION,                       
                               NotePad.Notes.COLUMN_NAME_TITLE+" like ?",   
                               new String[]{"%"+str_Search+"%"}, //匹配字符串条件                           
                       NotePad.Notes.DEFAULT_SORT_ORDER  // Use the default sort order.
               );
               adapter.swapCursor(search_cursor);//刷新listview

           }else {
               if (cursor!=null)//删除搜索框中的text后刷新listview
               adapter.swapCursor(cursor);//刷新listview
           }
       }
   });
   }
 ```