首先说一下信息收件人这个类的继承关系

RecipientsEditor->EncapsulatedMTKRecipientEditTextView(这两个类都在mms目录下)

->MTKRecipientEditTextView(mediatek/frameworks-ext/ex/chips/src/com/android/ex/chips/)

->MultiAutoCompleteTextView->AutoCompleteTextView->EditText(frameworks/base/core/java/android/widget)

然后我们想要修改这个输入框的样式，包括里面的文字颜色、背景等。这个我们可以在MTKRecipientEditTextView 中进行设定，关键代码如下

private Bitmap createUnselectedChip(RecipientEntry contact, TextPaint paint,            boolean leaveBlankIconSpacer) {        // Ellipsize the text so that it takes AT MOST the entire width of the        // autocomplete text entry area. Make sure to leave space for padding        // on the sides.        int height = (int) mChipHeight;        int iconWidth = height;        float[] widths = new float[1];        paint.getTextWidths(" ", widths);        /// M: Limit ellipsizedText in some case (ex. moreChip)        CharSequence ellipsizedText = ellipsizeText(createChipDisplayText(contact), paint,                (mLimitedWidthForSpan == -1) ? (calculateAvailableWidth() - iconWidth - widths[0]) : (mLimitedWidthForSpan - iconWidth - widths[0]));        printDebugLog(TAG,"[createUnselectedChip] start, " + ellipsizedText + ", ID: " + contact.getContactId());        // Make sure there is a minimum chip width so the user can ALWAYS        // tap a chip without difficulty.                /// M: Only leave space if icon exists. @{
            boolean hasIcon = false;        int ellipsizedTextWidth = (int) Math.floor(paint.measureText(ellipsizedText, 0, ellipsizedText.length()));        int width = ellipsizedTextWidth + (mChipPadding * 2);        /// @}        // Create the background of the chip.        Bitmap tmpBitmap = null;        Drawable background = getChipBackground(contact);        if (background != null) {            Canvas canvas = null; /// M: Only leave space if icon exists                    Bitmap photo = null;            Matrix matrix = null;            // Don't draw photos for recipients that have been typed in OR generated on the fly.            long contactId = contact.getContactId();            boolean drawPhotos = isPhoneQuery() ?                    contactId != RecipientEntry.INVALID_CONTACT                    : (contactId != RecipientEntry.INVALID_CONTACT                            && (contactId != RecipientEntry.GENERATED_CONTACT &&                                    !TextUtils.isEmpty(contact.getDisplayName())));if (drawPhotos) {                byte[] photoBytes = contact.getPhotoBytes();                // There may not be a photo yet if anything but the first contact address                // was selected.                Trace.traceBegin(Trace.TRACE_TAG_VIEW, "getPhoto " + contact.getContactId());                if (photoBytes == null && contact.getPhotoThumbnailUri() != null) {                    // TODO: cache this in the recipient entry?                    ((BaseRecipientAdapter) getAdapter()).fetchPhoto(contact, contact                            .getPhotoThumbnailUri());                    photoBytes = contact.getPhotoBytes();                }                Trace.traceEnd(Trace.TRACE_TAG_VIEW);                Trace.traceBegin(Trace.TRACE_TAG_VIEW, "decodePhoto");                 if (photoBytes != null) {/* Vanzo:zhangshuli on: Thu, 12 Mar 2015 11:48:23 +0000                    photo = BitmapFactory.decodeByteArray(photoBytes, 0, photoBytes.length); */// End of Vanzo: zhangshuli                } else {                    // TODO: can the scaled down default photo be cached?/* Vanzo:zhangshuli on: Thu, 12 Mar 2015 11:48:28 +0000                    photo = mDefaultContactPhoto; */// End of Vanzo: zhangshuli                }                 Trace.traceEnd(Trace.TRACE_TAG_VIEW);                // Draw the photo on the left side.                if (photo != null) {                    /// M: Only leave space if icon exists. @{
                        hasIcon = true;                    width = ellipsizedTextWidth + (mChipPadding * 2) + iconWidth;                     /// @}                    RectF src = new RectF(0, 0, photo.getWidth(), photo.getHeight());                    Rect backgroundPadding = new Rect();                    mChipBackground.getPadding(backgroundPadding);                    RectF dst = new RectF(width - iconWidth + backgroundPadding.left,                            0 + backgroundPadding.top,                            width - backgroundPadding.right,                            height - backgroundPadding.bottom);                    matrix = new Matrix();                    matrix.setRectToRect(src, dst, Matrix.ScaleToFit.FILL);}            } else if (!leaveBlankIconSpacer || isPhoneQuery()) {                iconWidth = 0;            }            tmpBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);            canvas = new Canvas(tmpBitmap);            background.setBounds(0, 0, width, height);            background.draw(canvas);            if (photo != null && matrix != null) {                canvas.drawBitmap(photo, matrix, paint);            }            /* Vanzo:shangxiaopeng on: Wed, 28 May 2014 11:03:56 +0800 * modify settings fun            paint.setColor(getContext().getResources().getColor(android.R.color.black)); */            paint.setColor(getContext().getResources().getColor(android.R.color.white));// End of Vanzo: shangxiaopeng            // Vertically center the text in the chip.            int xPositionOfText = hasIcon ? mChipPadding : (mChipPadding + (width - mChipPadding*2 - ellipsizedTextWidth)/2); /// M: Horizontally center the text in the chip            canvas.drawText(ellipsizedText, 0, ellipsizedText.length(), xPositionOfText,                    getTextYOffset((String)ellipsizedText, paint, height), paint);        } else {            Log.w(TAG, "Unable to draw a background for the chips as it was never set");        }        if (tmpBitmap == null) {            tmpBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        }        printDebugLog(TAG,"[createUnselectedChip] end");        return tmpBitmap;    }

但是，如果我们想要更改下拉框的布局，你会发现，无论你怎么在mediatek下修改都是没有效果的。后来发现要在它的父类中进行修改 AutoCompleteTextView

代码如下

public void showDropDown() {        buildImeCompletions();        if (mPopup.getAnchorView() == null) {            if (mDropDownAnchorId != View.NO_ID) {                mPopup.setAnchorView(getRootView().findViewById(mDropDownAnchorId));            } else {                mPopup.setAnchorView(this);            }            }            if (!isPopupShowing()) {            // Make sure the list does not obscure the IME when shown for the first time.            mPopup.setInputMethodMode(ListPopupWindow.INPUT_METHOD_NEEDED);            mPopup.setListItemExpandMax(EXPAND_MAX);        }            mPopup.show();        mPopup.getListView().setOverScrollMode(View.OVER_SCROLL_ALWAYS);/* Vanzo:zhangshuli on: Wed, 11 Mar 2015 20:27:52 +0000 */        mPopup.getListView().setPadding(0, 0, mPopupMargnRight, 0);        if (mPopupMargnRight != 0){            mPopup.getListView().setScrollBarStyle(ScrollView.SCROLLBARS_OUTSIDE_OVERLAY);        }    // End of Vanzo: zhangshuli    }

这个代码是修改下拉框滚动条样式跟listview中item的边距

这里面用到了关于添加自定义属性的方法，参照另一篇文章