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