diff --git a/widget/NoteWidgetProvider.java b/widget/NoteWidgetProvider.java
new file mode 100644
index 0000000..d2dd78f
--- /dev/null
+++ b/widget/NoteWidgetProvider.java
@@ -0,0 +1,132 @@
+package net.micode.notes.widget;
+
+import android.app.PendingIntent;
+import android.appwidget.AppWidgetManager;
+import android.appwidget.AppWidgetProvider;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+import android.util.Log;
+import android.widget.RemoteViews;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.tool.ResourceParser;
+import net.micode.notes.ui.NoteEditActivity;
+import net.micode.notes.ui.NotesListActivity;
+
+// 抽象的笔记小部件提供者类，继承自AppWidgetProvider，用于管理笔记小部件的更新和删除
+public abstract class NoteWidgetProvider extends AppWidgetProvider {
+
+    // 查询笔记小部件信息的投影，包括ID、背景颜色ID和片段
+    public static final String[] PROJECTION = new String[]{
+            NoteColumns.ID,
+            NoteColumns.BG_COLOR_ID,
+            NoteColumns.SNIPPET
+    };
+    // 投影中ID列的索引
+    public static final int COLUMN_ID = 0;
+    // 投影中背景颜色ID列的索引
+    public static final int COLUMN_BG_COLOR_ID = 1;
+    // 投影中片段列的索引
+    public static final int COLUMN_SNIPPET = 2;
+
+    private static final String TAG = "NoteWidgetProvider";
+
+    // 当小部件被删除时调用，用于更新数据库中与小部件相关的笔记信息
+    @Override
+    public void onDeleted(Context context, int[] appWidgetIds) {
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            context.getContentResolver().update(Notes.CONTENT_NOTE_URI,
+                    values,
+                    NoteColumns.WIDGET_ID + "=?",
+                    new String[]{String.valueOf(appWidgetIds[i])});
+        }
+    }
+
+    // 获取指定小部件ID的笔记小部件信息的方法
+    private Cursor getNoteWidgetInfo(Context context, int widgetId) {
+        return context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                PROJECTION,
+                NoteColumns.WIDGET_ID + "=? AND " + NoteColumns.PARENT_ID + "<>?",
+                new String[]{String.valueOf(widgetId), String.valueOf(Notes.ID_TRASH_FOLER)},
+                null);
+    }
+
+    // 更新小部件的方法，可被子类调用，默认调用带隐私模式参数的更新方法，传入false
+    protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        update(context, appWidgetManager, appWidgetIds, false);
+    }
+
+    // 实际的更新小部件方法，根据小部件ID更新小部件的显示内容和点击事件
+    private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
+                        boolean privacyMode) {
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            if (appWidgetIds[i]!= AppWidgetManager.INVALID_APPWIDGET_ID) {
+                // 获取默认背景颜色ID
+                int bgId = ResourceParser.getDefaultBgId(context);
+                String snippet = "";
+                // 创建点击小部件时启动的意图，默认为启动NoteEditActivity
+                Intent intent = new Intent(context, NoteEditActivity.class);
+                intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]);
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType());
+
+                // 获取小部件对应的笔记信息
+                Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
+                if (c!= null && c.moveToFirst()) {
+                    if (c.getCount() > 1) {
+                        Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);
+                        c.close();
+                        return;
+                    }
+                    snippet = c.getString(COLUMN_SNIPPET);
+                    bgId = c.getInt(COLUMN_BG_COLOR_ID);
+                    intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID));
+                    intent.setAction(Intent.ACTION_VIEW);
+                } else {
+                    snippet = context.getResources().getString(R.string.widget_havenot_content);
+                    intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
+                }
+                if (c!= null) {
+                    c.close();
+                }
+
+                // 创建远程视图，用于更新小部件的UI
+                RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
+                rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId));
+                intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);
+
+                // 根据隐私模式设置不同的文本和点击意图
+                PendingIntent pendingIntent = null;
+                if (privacyMode) {
+                    rv.setTextViewText(R.id.widget_text,
+                            context.getString(R.string.widget_under_visit_mode));
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
+                            context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
+                } else {
+                    rv.setTextViewText(R.id.widget_text, snippet);
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
+                            PendingIntent.FLAG_UPDATE_CURRENT);
+                }
+                rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
+
+                // 更新小部件
+                appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
+            }
+        }
+    }
+
+    // 抽象方法，用于获取背景资源ID，由子类实现
+    protected abstract int getBgResourceId(int bgId);
+
+    // 抽象方法，用于获取布局ID，由子类实现
+    protected abstract int getLayoutId();
+
+    // 抽象方法，用于获取小部件类型，由子类实现
+    protected abstract int getWidgetType();
+}
\ No newline at end of file
diff --git a/widget/NoteWidgetProvider_2x.java b/widget/NoteWidgetProvider_2x.java
new file mode 100644
index 0000000..f5ebce1
--- /dev/null
+++ b/widget/NoteWidgetProvider_2x.java
@@ -0,0 +1,36 @@
+package net.micode.notes.widget;
+
+import android.appwidget.AppWidgetManager;
+import android.content.Context;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.ResourceParser;
+
+// 2x尺寸笔记小部件提供者类，继承自NoteWidgetProvider，实现特定于2x尺寸小部件的功能
+public class NoteWidgetProvider_2x extends NoteWidgetProvider {
+
+    // 当小部件更新时调用，调用父类的更新方法来更新小部件
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+
+    // 获取2x尺寸小部件的布局ID
+    @Override
+    protected int getLayoutId() {
+        return R.layout.widget_2x;
+    }
+
+    // 根据背景颜色ID获取2x尺寸小部件的背景资源ID
+    @Override
+    protected int getBgResourceId(int bgId) {
+        return ResourceParser.WidgetBgResources.getWidget2xBgResource(bgId);
+    }
+
+    // 获取2x尺寸小部件的类型
+    @Override
+    protected int getWidgetType() {
+        return Notes.TYPE_WIDGET_2X;
+    }
+}
\ No newline at end of file
diff --git a/widget/NoteWidgetProvider_4x.java b/widget/NoteWidgetProvider_4x.java
new file mode 100644
index 0000000..2a9758d
--- /dev/null
+++ b/widget/NoteWidgetProvider_4x.java
@@ -0,0 +1,35 @@
+package net.micode.notes.widget;
+
+import android.appwidget.AppWidgetManager;
+import android.content.Context;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.tool.ResourceParser;
+
+// 4x尺寸笔记小部件提供者类，继承自NoteWidgetProvider，用于创建和管理4x尺寸的笔记小部件
+public class NoteWidgetProvider_4x extends NoteWidgetProvider {
+
+    // 当小部件更新时被调用，调用父类的更新方法来执行更新操作
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+
+    // 获取4x尺寸小部件的布局资源ID
+    protected int getLayoutId() {
+        return R.layout.widget_4x;
+    }
+
+    // 根据背景颜色ID获取4x尺寸小部件的背景资源ID
+    @Override
+    protected int getBgResourceId(int bgId) {
+        return ResourceParser.WidgetBgResources.getWidget4xBgResource(bgId);
+    }
+
+    // 获取4x尺寸小部件的类型
+    @Override
+    protected int getWidgetType() {
+        return Notes.TYPE_WIDGET_4X;
+    }
+}
\ No newline at end of file