小米开源便签Notes-源码研究(1)-导出功能整体思路

@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.menu_new_folder: {
			showCreateOrModifyFolderDialog(true);
			break;
		}
		case R.id.menu_export_text: {
			exportNoteToText();
			break;
		}
		case R.id.menu_sync: {
			if (isSyncMode()) {
				if (TextUtils.equals(item.getTitle(),
						getString(R.string.menu_sync))) {
					GTaskSyncService.startSync(this);
				} else {
					GTaskSyncService.cancelSync(this);
				}
			} else {
				startPreferenceActivity();
			}
			break;
		}
		case R.id.menu_setting: {
			startPreferenceActivity();
			break;
		}
		case R.id.menu_new_note: {
			createNewNote();
			break;
		}
		case R.id.menu_search:
			onSearchRequested();
			break;
		default:
			break;
		}
		return true;
	}

private void exportNoteToText() {
		final BackupUtils backup = BackupUtils
				.getInstance(NotesListActivity.this);
		new AsyncTask<Void, Void, Integer>() {


			@Override
			protected Integer doInBackground(Void... unused) {
				return backup.exportToText();
			}


			@Override
			protected void onPostExecute(Integer result) {
				if (result == BackupUtils.STATE_SD_CARD_UNMOUONTED) {
					AlertDialog.Builder builder = new AlertDialog.Builder(
							NotesListActivity.this);
					builder.setTitle(NotesListActivity.this
							.getString(R.string.failed_sdcard_export));
					builder.setMessage(NotesListActivity.this
							.getString(R.string.error_sdcard_unmounted));
					builder.setPositiveButton(android.R.string.ok, null);
					builder.show();
				} else if (result == BackupUtils.STATE_SUCCESS) {
					AlertDialog.Builder builder = new AlertDialog.Builder(
							NotesListActivity.this);
					builder.setTitle(NotesListActivity.this
							.getString(R.string.success_sdcard_export));
					builder.setMessage(NotesListActivity.this.getString(
							R.string.format_exported_file_location,
							backup.getExportedTextFileName(),
							backup.getExportedTextFileDir()));
					builder.setPositiveButton(android.R.string.ok, null);
					builder.show();
				} else if (result == BackupUtils.STATE_SYSTEM_ERROR) {
					AlertDialog.Builder builder = new AlertDialog.Builder(
							NotesListActivity.this);
					builder.setTitle(NotesListActivity.this
							.getString(R.string.failed_sdcard_export));
					builder.setMessage(NotesListActivity.this
							.getString(R.string.error_sdcard_export));
					builder.setPositiveButton(android.R.string.ok, null);
					builder.show();
				}
			}


		}.execute();
	}

public int exportToText() {
		return mTextExport.exportToText();
	}

Cursor folderCursor = mContext.getContentResolver().query(
					Notes.CONTENT_NOTE_URI,
					NOTE_PROJECTION,
					"(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND "
							+ NoteColumns.PARENT_ID + "<>"
							+ Notes.ID_TRASH_FOLER + ") OR " + NoteColumns.ID
							+ "=" + Notes.ID_CALL_RECORD_FOLDER, null, null);

 <provider
            android:name="net.micode.notes.data.NotesProvider"
            android:authorities="micode_notes"
            android:multiprocess="true" />

小米开源便签Notes-源码研究(1)-导出功能整体思路

原文：http://blog.csdn.net/fansunion/article/details/49760233