Android TextView自定义选中弹出菜单记笔记功能

效果图

两种方案实现

一、 通过onActionItemClicked

完整代码：

        mManusTv.setCustomSelectionActionModeCallback(new ActionMode.Callback() {
            @Override
            public boolean onCreateActionMode(ActionMode mode, Menu menu) {
                MenuInflater inflater = mode.getMenuInflater();
                if (inflater != null) {
                    inflater.inflate(R.menu.manus_menu, menu);
                }
                return true;
            }

            @Override
            public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
                return false;
            }

            @Override
            public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
                if (item.getItemId() == R.id.notes) {
                    //记笔记
                    if (mManusTv == null) {
                        return false;
                    }
                    int min = 0;
                    int max = mManusContent.length();
                    if (mManusTv.isFocused()) {
                        final int selStart = mManusTv.getSelectionStart();
                        final int selEnd = mManusTv.getSelectionEnd();

                        min = Math.max(0, Math.min(selStart, selEnd));
                        max = Math.max(0, Math.max(selStart, selEnd));
                    }
                }
                return false;
            }

            @Override
            public void onDestroyActionMode(ActionMode mode) {

            }
        });

menu:

方案一在小米手机上不会出现记笔记的选项，原因是小米的定制系统禁用了该事件。

二、 SelectableTextHelper

使用：

        mSelectableTextHelper = new SelectableTextHelper.Builder(mManusTv)
                .setSelectedColor(getResources().getColor(R.color.color_tv_theme_transparent15))
                .setCursorHandleSizeInDp(20)
                .setCursorHandleColor(getResources().getColor(R.color.colotBtnTheme))
                .build();

选中回调监听：

        mSelectableTextHelper.setOnNotesClickListener(new OnNoteBookClickListener() {
            @Override
            public void onTextSelect(CharSequence charSequence) {
                LogUtils.e("记笔记："+charSequence);
                String content = charSequence.toString();
            }
        });

SelectableTextHelper完整代码：

public class SelectableTextHelper {

    private final static int DEFAULT_SELECTION_LENGTH = 1;
    private static final int DEFAULT_SHOW_DURATION = 100;

    private CursorHandle mStartHandle;
    private CursorHandle mEndHandle;
    private OperateWindow mOperateWindow;
    private SelectionInfo mSelectionInfo = new SelectionInfo();
    private OnSelectListener mSelectListener;

    private Context mContext;
    private TextView mTextView;
    private Spannable mSpannable;

    private int mTouchX;
    private int mTouchY;

    private int mSelectedColor;
    private int mCursorHandleColor;
    private int mCursorHandleSize;
    private BackgroundColorSpan mSpan;
    private boolean isHideWhenScroll;
    private boolean isHide = true;

    private ViewTreeObserver.OnPreDrawListener mOnPreDrawListener;
    ViewTreeObserver.OnScrollChangedListener mOnScrollChangedListener;

    public SelectableTextHelper(Builder builder) {
        mTextView = builder.mTextView;
        mContext = mTextView.getContext();
        mSelectedColor = builder.mSelectedColor;
        mCursorHandleColor = builder.mCursorHandleColor;
        mCursorHandleSize = TextLayoutUtil.dp2px(mContext, builder.mCursorHandleSizeInDp);
        init();
    }

    private void init() {
        mTextView.setText(mTextView.getText(), TextView.BufferType.SPANNABLE);
        mTextView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                showSelectView(mTouchX, mTouchY);
                return true;
            }
        });

        mTextView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                mTouchX = (int) event.getX();
                mTouchY = (int) event.getY();
                return false;
            }
        });

        mTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                resetSelectionInfo();
                hideSelectView();
            }
        });
        mTextView.addOnAttachStateChangeListener(new View.OnAttachStateChangeListener() {
            @Override
            public void onViewAttachedToWindow(View v) {

            }

            @Override
            public void onViewDetachedFromWindow(View v) {
                destroy();
            }
        });

        mOnPreDrawListener = new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                if (isHideWhenScroll) {
                    isHideWhenScroll = false;
                    postShowSelectView(DEFAULT_SHOW_DURATION);
                }
                return true;
            }
        };
        mTextView.getViewTreeObserver().addOnPreDrawListener(mOnPreDrawListener);

        mOnScrollChangedListener = new ViewTreeObserver.OnScrollChangedListener() {
            @Override
            public void onScrollChanged() {
                if (!isHideWhenScroll && !isHide) {
                    isHideWhenScroll = true;
                    if (mOperateWindow != null) {
                        mOperateWindow.dismiss();
                    }
                    if (mStartHandle != null) {
                        mStartHandle.dismiss();
                    }
                    if (mEndHandle != null) {
                        mEndHandle.dismiss();
                    }
                }
            }
        };
        mTextView.getViewTreeObserver().addOnScrollChangedListener(mOnScrollChangedListener);

        mOperateWindow = new OperateWindow(mContext);
    }

    private void postShowSelectView(int duration) {
        mTextView.removeCallbacks(mShowSelectViewRunnable);
        if (duration <= 0) {
            mShowSelectViewRunnable.run();
        } else {
            mTextView.postDelayed(mShowSelectViewRunnable, duration);
        }
    }

    private final Runnable mShowSelectViewRunnable = new Runnable() {
        @Override
        public void run() {
            if (isHide) {

                return;
            }
            if (mOperateWindow != null) {
                mOperateWindow.show();
            }
            if (mStartHandle != null) {
                showCursorHandle(mStartHandle);
            }
            if (mEndHandle != null) {
                showCursorHandle(mEndHandle);
            }
        }
    };

    private void hideSelectView() {
        isHide = true;
        if (mStartHandle != null) {
            mStartHandle.dismiss();
        }
        if (mEndHandle != null) {
            mEndHandle.dismiss();
        }
        if (mOperateWindow != null) {
            mOperateWindow.dismiss();
        }
    }

    private void resetSelectionInfo() {
        mSelectionInfo.mSelectionContent = null;
        if (mSpannable != null && mSpan != null) {
            mSpannable.removeSpan(mSpan);
            mSpan = null;
        }
    }

    private void showSelectView(int x, int y) {
        hideSelectView();
        resetSelectionInfo();
        isHide = false;
        if (mStartHandle == null) {

            mStartHandle = new CursorHandle(true);
        }
        if (mEndHandle == null) {

            mEndHandle = new CursorHandle(false);
        }

        int startOffset = TextLayoutUtil.getPreciseOffset(mTextView, x, y);
        int endOffset = startOffset + DEFAULT_SELECTION_LENGTH;
        if (mTextView.getText() instanceof Spannable) {
            mSpannable = (Spannable) mTextView.getText();
        }
        if (mSpannable == null || startOffset >= mTextView.getText().length()) {
            return;
        }
        selectText(startOffset, endOffset);
        showCursorHandle(mStartHandle);
        showCursorHandle(mEndHandle);
        mOperateWindow.show();
    }

    private void showCursorHandle(CursorHandle cursorHandle) {
        Layout layout = mTextView.getLayout();
        int offset = cursorHandle.isLeft ? mSelectionInfo.mStart : mSelectionInfo.mEnd;
        cursorHandle.show((int) layout.getPrimaryHorizontal(offset), layout.getLineBottom(layout.getLineForOffset(offset)));
    }

    private void selectText(int startPos, int endPos) {
        if (startPos != -1) {
            mSelectionInfo.mStart = startPos;
        }
        if (endPos != -1) {
            mSelectionInfo.mEnd = endPos;
        }
        if (mSelectionInfo.mStart > mSelectionInfo.mEnd) {
            int temp = mSelectionInfo.mStart;
            mSelectionInfo.mStart = mSelectionInfo.mEnd;
            mSelectionInfo.mEnd = temp;
        }

        if (mSpannable != null) {
            if (mSpan == null) {
                mSpan = new BackgroundColorSpan(mSelectedColor);
            }
            mSelectionInfo.mSelectionContent = mSpannable.subSequence(mSelectionInfo.mStart, mSelectionInfo.mEnd).toString();
            mSpannable.setSpan(mSpan, mSelectionInfo.mStart, mSelectionInfo.mEnd, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
            if (mSelectListener != null) {
                mSelectListener.onTextSelected(mSelectionInfo.mSelectionContent);
            }
        }
    }

    OnNoteBookClickListener mNoteBookClickListener;
    public void setSelectListener(OnSelectListener selectListener) {
        mSelectListener = selectListener;
    }

    public void setOnNotesClickListener(OnNoteBookClickListener notesClickListener) {
        mNoteBookClickListener = notesClickListener;

    }

    public void destroy() {
        mTextView.getViewTreeObserver().removeOnScrollChangedListener(mOnScrollChangedListener);
        mTextView.getViewTreeObserver().removeOnPreDrawListener(mOnPreDrawListener);
        resetSelectionInfo();
        hideSelectView();
        mStartHandle = null;
        mEndHandle = null;
        mOperateWindow = null;
    }

    public void dismiss() {
        SelectableTextHelper.this.resetSelectionInfo();
        SelectableTextHelper.this.hideSelectView();
    }

    /**
     * Operate windows : copy, select all
     */
    private class OperateWindow {

        private PopupWindow mWindow;
        private int[] mTempCoors = new int[2];

        private int mWidth;
        private int mHeight;

        public OperateWindow(final Context context) {
            View contentView = LayoutInflater.from(context).inflate(R.layout.layout_operate_windows, null);
            contentView.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
            mWidth = contentView.getMeasuredWidth();
            mHeight = contentView.getMeasuredHeight();
            mWindow =
                new PopupWindow(contentView, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, false);
            mWindow.setClippingEnabled(false);

            contentView.findViewById(R.id.tv_copy).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    ClipboardManager clip = (ClipboardManager) mContext.getSystemService(Context.CLIPBOARD_SERVICE);
                    clip.setPrimaryClip(
                        ClipData.newPlainText(mSelectionInfo.mSelectionContent, mSelectionInfo.mSelectionContent));
                    if (mSelectListener != null) {
                        mSelectListener.onTextSelected(mSelectionInfo.mSelectionContent);
                    }
                    SelectableTextHelper.this.resetSelectionInfo();
                    SelectableTextHelper.this.hideSelectView();
                }
            });
            contentView.findViewById(R.id.tv_select_all).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    hideSelectView();
                    selectText(0, mTextView.getText().length());
                    isHide = false;
                    showCursorHandle(mStartHandle);
                    showCursorHandle(mEndHandle);
                    mOperateWindow.show();
                }
            });
            contentView.findViewById(R.id.tv_note).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (mNoteBookClickListener != null) {
                        mNoteBookClickListener.onTextSelect(mSelectionInfo.mSelectionContent);
                    }
                    SelectableTextHelper.this.resetSelectionInfo();
                    SelectableTextHelper.this.hideSelectView();
                }
            });
        }

        public void show() {
            mTextView.getLocationInWindow(mTempCoors);
            Layout layout = mTextView.getLayout();
            int posX = (int) layout.getPrimaryHorizontal(mSelectionInfo.mStart) + mTempCoors[0];
            int posY = layout.getLineTop(layout.getLineForOffset(mSelectionInfo.mStart)) + mTempCoors[1] - mHeight - 16;
            if (posX <= 0) {

                posX = 16;
            }
            if (posY < 0) {

                posY = 16;
            }
            if (posX + mWidth > TextLayoutUtil.getScreenWidth(mContext)) {
                posX = TextLayoutUtil.getScreenWidth(mContext) - mWidth - 16;
            }
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                mWindow.setElevation(8f);
            }
            mWindow.showAtLocation(mTextView, Gravity.NO_GRAVITY, posX, posY);
        }

        public void dismiss() {
            mWindow.dismiss();
        }

        public boolean isShowing() {
            return mWindow.isShowing();
        }
    }

    private class CursorHandle extends View {

        private PopupWindow mPopupWindow;
        private Paint mPaint;

        private int mCircleRadius = mCursorHandleSize / 2;
        private int mWidth = mCircleRadius * 2;
        private int mHeight = mCircleRadius * 2;
        private int mPadding = 25;
        private boolean isLeft;

        public CursorHandle(boolean isLeft) {
            super(mContext);
            this.isLeft = isLeft;
            mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mPaint.setColor(mCursorHandleColor);

            mPopupWindow = new PopupWindow(this);
            mPopupWindow.setClippingEnabled(false);
            mPopupWindow.setWidth(mWidth + mPadding * 2);
            mPopupWindow.setHeight(mHeight + mPadding / 2);
            invalidate();
        }

        @Override
        protected void onDraw(Canvas canvas) {
            canvas.drawCircle(mCircleRadius + mPadding, mCircleRadius, mCircleRadius, mPaint);
            if (isLeft) {
                canvas.drawRect(mCircleRadius + mPadding, 0, mCircleRadius * 2 + mPadding, mCircleRadius, mPaint);
            } else {
                canvas.drawRect(mPadding, 0, mCircleRadius + mPadding, mCircleRadius, mPaint);
            }
        }

        private int mAdjustX;
        private int mAdjustY;

        private int mBeforeDragStart;
        private int mBeforeDragEnd;

        @Override
        public boolean onTouchEvent(MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    mBeforeDragStart = mSelectionInfo.mStart;
                    mBeforeDragEnd = mSelectionInfo.mEnd;
                    mAdjustX = (int) event.getX();
                    mAdjustY = (int) event.getY();
                    break;
                case MotionEvent.ACTION_UP:
                case MotionEvent.ACTION_CANCEL:
                    mOperateWindow.show();
                    break;
                case MotionEvent.ACTION_MOVE:
                    mOperateWindow.dismiss();
                    int rawX = (int) event.getRawX();
                    int rawY = (int) event.getRawY();
                    update(rawX + mAdjustX - mWidth, rawY + mAdjustY - mHeight);
                    break;
            }
            return true;
        }

        private void changeDirection() {
            isLeft = !isLeft;
            invalidate();
        }

        public void dismiss() {
            mPopupWindow.dismiss();
        }

        private int[] mTempCoors = new int[2];

        public void update(int x, int y) {
            mTextView.getLocationInWindow(mTempCoors);
            int oldOffset;
            if (isLeft) {
                oldOffset = mSelectionInfo.mStart;
            } else {
                oldOffset = mSelectionInfo.mEnd;
            }

            y -= mTempCoors[1];

            int offset = TextLayoutUtil.getHysteresisOffset(mTextView, x, y, oldOffset);

            if (offset != oldOffset) {
                resetSelectionInfo();
                if (isLeft) {
                    if (offset > mBeforeDragEnd) {
                        CursorHandle handle = getCursorHandle(false);
                        changeDirection();
                        handle.changeDirection();
                        mBeforeDragStart = mBeforeDragEnd;
                        selectText(mBeforeDragEnd, offset);
                        handle.updateCursorHandle();
                    } else {
                        selectText(offset, -1);
                    }
                    updateCursorHandle();
                } else {
                    if (offset < mBeforeDragStart) {
                        CursorHandle handle = getCursorHandle(true);
                        handle.changeDirection();
                        changeDirection();
                        mBeforeDragEnd = mBeforeDragStart;
                        selectText(offset, mBeforeDragStart);
                        handle.updateCursorHandle();
                    } else {
                        selectText(mBeforeDragStart, offset);
                    }
                    updateCursorHandle();
                }
            }
        }

        private void updateCursorHandle() {
            mTextView.getLocationInWindow(mTempCoors);
            Layout layout = mTextView.getLayout();
            if (isLeft) {
                mPopupWindow.update((int) layout.getPrimaryHorizontal(mSelectionInfo.mStart) - mWidth + getExtraX(),
                    layout.getLineBottom(layout.getLineForOffset(mSelectionInfo.mStart)) + getExtraY(), -1, -1);
            } else {
                mPopupWindow.update((int) layout.getPrimaryHorizontal(mSelectionInfo.mEnd) + getExtraX(),
                    layout.getLineBottom(layout.getLineForOffset(mSelectionInfo.mEnd)) + getExtraY(), -1, -1);
            }
        }

        public void show(int x, int y) {
            mTextView.getLocationInWindow(mTempCoors);
            int offset = isLeft ? mWidth : 0;
            mPopupWindow.showAtLocation(mTextView, Gravity.NO_GRAVITY, x - offset + getExtraX(), y + getExtraY());
        }

        public int getExtraX() {
            return mTempCoors[0] - mPadding + mTextView.getPaddingLeft();
        }

        public int getExtraY() {
            return mTempCoors[1] + mTextView.getPaddingTop();
        }
    }

    private CursorHandle getCursorHandle(boolean isLeft) {
        if (mStartHandle.isLeft == isLeft) {
            return mStartHandle;
        } else {
            return mEndHandle;
        }
    }

    public static class Builder {
        private TextView mTextView;
        private int mCursorHandleColor = 0xFF1379D6;
        private int mSelectedColor = 0xFFAFE1F4;
        private float mCursorHandleSizeInDp = 24;

        public Builder(TextView textView) {
            mTextView = textView;
        }

        public Builder setCursorHandleColor(@ColorInt int cursorHandleColor) {
            mCursorHandleColor = cursorHandleColor;
            return this;
        }

        public Builder setCursorHandleSizeInDp(float cursorHandleSizeInDp) {
            mCursorHandleSizeInDp = cursorHandleSizeInDp;
            return this;
        }

        public Builder setSelectedColor(@ColorInt int selectedBgColor) {
            mSelectedColor = selectedBgColor;
            return this;
        }

        public SelectableTextHelper build() {
            return new SelectableTextHelper(this);
        }
    }
}

TextLayoutUtil

public class TextLayoutUtil {

    public static int getScreenWidth(Context context) {
        return context.getResources().getDisplayMetrics().widthPixels;
    }

    public static int getPreciseOffset(TextView textView, int x, int y) {
        Layout layout = textView.getLayout();
        if (layout != null) {
            int topVisibleLine = layout.getLineForVertical(y);
            int offset = layout.getOffsetForHorizontal(topVisibleLine, x);

            int offsetX = (int) layout.getPrimaryHorizontal(offset);

            if (offsetX > x) {
                return layout.getOffsetToLeftOf(offset);
            } else {
                return offset;
            }
        } else {
            return -1;
        }
    }

    public static int getHysteresisOffset(TextView textView, int x, int y, int previousOffset) {
        final Layout layout = textView.getLayout();
        if (layout == null) return -1;

        int line = layout.getLineForVertical(y);

        // The "HACK BLOCK"S in this function is required because of how Android Layout for
        // TextView works - if 'offset' equals to the last character of a line, then
        //
        // * getLineForOffset(offset) will result the NEXT line
        // * getPrimaryHorizontal(offset) will return 0 because the next insertion point is on the next line
        // * getOffsetForHorizontal(line, x) will not return the last offset of a line no matter where x is
        // These are highly undesired and is worked around with the HACK BLOCK
        //
        // @see Moon+ Reader/Color Note - see how it can't select the last character of a line unless you move
        // the cursor to the beginning of the next line.
        //
        ////////////////////HACK BLOCK////////////////////////////////////////////////////

        if (isEndOfLineOffset(layout, previousOffset)) {
            // we have to minus one from the offset so that the code below to find
            // the previous line can work correctly.
            int left = (int) layout.getPrimaryHorizontal(previousOffset - 1);
            int right = (int) layout.getLineRight(line);
            int threshold = (right - left) / 2; // half the width of the last character
            if (x > right - threshold) {
                previousOffset -= 1;
            }
        }
        ///////////////////////////////////////////////////////////////////////////////////

        final int previousLine = layout.getLineForOffset(previousOffset);
        final int previousLineTop = layout.getLineTop(previousLine);
        final int previousLineBottom = layout.getLineBottom(previousLine);
        final int hysteresisThreshold = (previousLineBottom - previousLineTop) / 2;

        // If new line is just before or after previous line and y position is less than
        // hysteresisThreshold away from previous line, keep cursor on previous line.
        if (((line == previousLine + 1) && ((y - previousLineBottom) < hysteresisThreshold)) || ((line == previousLine - 1) && ((
            previousLineTop
                - y) < hysteresisThreshold))) {
            line = previousLine;
        }

        int offset = layout.getOffsetForHorizontal(line, x);

        // This allow the user to select the last character of a line without moving the
        // cursor to the next line. (As Layout.getOffsetForHorizontal does not return the
        // offset of the last character of the specified line)
        //
        // But this function will probably get called again immediately, must decrement the offset
        // by 1 to compensate for the change made below. (see previous HACK BLOCK)
        /////////////////////HACK BLOCK///////////////////////////////////////////////////
        if (offset < textView.getText().length() - 1) {
            if (isEndOfLineOffset(layout, offset + 1)) {
                int left = (int) layout.getPrimaryHorizontal(offset);
                int right = (int) layout.getLineRight(line);
                int threshold = (right - left) / 2; // half the width of the last character
                if (x > right - threshold) {
                    offset += 1;
                }
            }
        }
        //////////////////////////////////////////////////////////////////////////////////

        return offset;
    }

    private static boolean isEndOfLineOffset(Layout layout, int offset) {
        return offset > 0 && layout.getLineForOffset(offset) == layout.getLineForOffset(offset - 1) + 1;
    }

    public static int dp2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }
}

SelectionInfo：

public class SelectionInfo {
    public int mStart;
    public int mEnd;
    public String mSelectionContent;
}

OnNoteBookClickListener：

public interface OnNoteBookClickListener {
    void onTextSelect(CharSequence content);
}

布局文件：