目录

前言

一、NotsPad功能

二、代码

1.NoteEditor的拓展活动：

2.部分功能介绍

(1)Creates a projection that returns the note ID and the note contents:

(2)定义自定义EditText视图，该视图在显示的每一行文本之间绘制线条:

（3）置顶功能：

在Activity即将到达前台时被调用。这发生在Activity到达任务栈的顶部时，或者当它第一次启动时。移动到列表中的第一个注释，为用户选择的操作设置适当的标题，将注释内容放入TextView中，并保存原始文本作为备份。

（4） 剪贴板导入NotesPad

总结

以上就是今天要讲的内容，本文仅仅简单介绍了NotesPad的一部分额外功能。

前言

介绍部分NotesPad的基本功能和额外添加的功能

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提示：以下是本篇文章正文内容，下面案例可供参考

一、NotsPad功能

Notespad是基于Android studio的一种功能，该工具是为了解决记录事件而创建的。

二、代码

1.NoteEditor的拓展活动：

代码如下：

public class NoteEditor extends Activity {
    // For logging and debugging purposes
    private static final String TAG = "NoteEditor";

    
    private static final String[] PROJECTION =
        new String[] {
            NotePad.Notes._ID,
            NotePad.Notes.COLUMN_NAME_TITLE,
            NotePad.Notes.COLUMN_NAME_NOTE
    };

2.部分功能介绍

(1)Creates a projection that returns the note ID and the note contents:

代码如下：

public static class LinedEditText extends EditText {
        private Rect mRect;
        private Paint mPaint;

        // This constructor is used by LayoutInflater
        public LinedEditText(Context context, AttributeSet attrs) {
            super(context, attrs);

            // Creates a Rect and a Paint object, and sets the style and color of the Paint object.
            mRect = new Rect();
            mPaint = new Paint();
            mPaint.setStyle(Paint.Style.STROKE);
            mPaint.setColor(0x800000FF);
        }

(2)定义自定义EditText视图，该视图在显示的每一行文本之间绘制线条:

代码如下：

public static class LinedEditText extends EditText {
        private Rect mRect;
        private Paint mPaint;

        // This constructor is used by LayoutInflater
        public LinedEditText(Context context, AttributeSet attrs) {
            super(context, attrs);

            // Creates a Rect and a Paint object, and sets the style and color of the Paint object.
            mRect = new Rect();
            mPaint = new Paint();
            mPaint.setStyle(Paint.Style.STROKE);
            mPaint.setColor(0x800000FF);
        }

（3）置顶功能：

在Activity即将到达前台时被调用。这发生在Activity到达任务栈的顶部时，或者当它第一次启动时。移动到列表中的第一个注释，为用户选择的操作设置适当的标题，将注释内容放入TextView中，并保存原始文本作为备份。

代码如下：

mCursor.moveToFirst();
            // Modifies the window title for the Activity according to the current Activity state.
            if (mState == STATE_EDIT) {
                // Set the title of the Activity to include the note title
                int colTitleIndex = mCursor.getColumnIndex(NotePad.Notes.COLUMN_NAME_TITLE);
                String title = mCursor.getString(colTitleIndex);
                Resources res = getResources();
                String text = String.format(res.getString(R.string.title_edit), title);
                setTitle(text);
            // Sets the title to "create" for inserts
            } else if (mState == STATE_INSERT) {
                setTitle(getText(R.string.title_create));
            }

            
            int colNoteIndex = mCursor.getColumnIndex(NotePad.Notes.COLUMN_NAME_NOTE);
            String note = mCursor.getString(colNoteIndex);
            mText.setTextKeepState(note);

            // Stores the original note text, to allow the user to revert changes.
            if (mOriginalContent == null) {
                mOriginalContent = note;
            }

        
        } else {
            setTitle(getText(R.string.error_title));
            mText.setText(getText(R.string.error_message));
        }
    }

（4） 剪贴板导入NotesPad

一种用剪贴板的内容替换笔记数据的辅助方法。

代码如下：

private final void performPaste() {

        // Gets a handle to the Clipboard Manager
        ClipboardManager clipboard = (ClipboardManager)
                getSystemService(Context.CLIPBOARD_SERVICE);

        // Gets a content resolver instance
        ContentResolver cr = getContentResolver();

        // Gets the clipboard data from the clipboard
        ClipData clip = clipboard.getPrimaryClip();
        if (clip != null) {

            String text=null;
            String title=null;

            // Gets the first item from the clipboard data
            ClipData.Item item = clip.getItemAt(0);

            // Tries to get the item's contents as a URI pointing to a note
            Uri uri = item.getUri();

            if (uri != null && NotePad.Notes.CONTENT_ITEM_TYPE.equals(cr.getType(uri))) {

                Cursor orig = cr.query(
                        uri,            // URI for the content provider
                        PROJECTION,     // Get the columns referred to in the projection
                        null,           // No selection variables
                        null,           // No selection variables, so no criteria are needed
                        null            // Use the default sort order
                );

                // If the Cursor is not null, and it contains at least one record
                // (moveToFirst() returns true), then this gets the note data from it.
                if (orig != null) {
                    if (orig.moveToFirst()) {
                        int colNoteIndex = mCursor.getColumnIndex(NotePad.Notes.COLUMN_NAME_NOTE);
                        int colTitleIndex = mCursor.getColumnIndex(NotePad.Notes.COLUMN_NAME_TITLE);
                        text = orig.getString(colNoteIndex);
                        title = orig.getString(colTitleIndex);
                    }

                    // Closes the cursor.
                    orig.close();
                }
            }

            // If the contents of the clipboard wasn't a reference to a note, then
            // this converts whatever it is to text.
            if (text == null) {
                text = item.coerceToText(this).toString();
            }

            // Updates the current note with the retrieved title and text.
            updateNote(text, title);
        }
    }

效果图：

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总结

以上就是这次博客中讲到的内容。

作者：闪电侠骑自行车

原文地址：https://blog.csdn.net/m0_46458494?spm=1001.2014.3001.5343