Android4.4 为什么有的window设置SIM为adjustPan不起作用？？
16lz
2021-01-23
android:gravity="center_horizontal"的EditText为什么设置了adjustPan之后不能调整View的位置。
今天遇到一个问题，当这个edittext同时设置 android:gravity="center_horizontal" android:singleLine="true"这两个属性时会导致当 edittext第二次呼出输入法的时候，整个window不能adjust..
1》先附上 TestDemo的Layout如下：
2》解答：这个问题经过分析是android4.4 TextView的一个共性的bug.
center_horizontal的TextView的宽度在计算时得到了一个超大的数，详见下述方法的最后一个else.
public float getLineRight(int line) { int dir = getParagraphDirection(line); Alignment align = getParagraphAlignment(line); if (align == Alignment.ALIGN_LEFT) { return getParagraphLeft(line) + getLineMax(line); } else if (align == Alignment.ALIGN_NORMAL) { if (dir == DIR_RIGHT_TO_LEFT) return mWidth; else return getParagraphLeft(line) + getLineMax(line); } else if (align == Alignment.ALIGN_RIGHT) { return mWidth; } else if (align == Alignment.ALIGN_OPPOSITE) { if (dir == DIR_RIGHT_TO_LEFT) return getLineMax(line); else return mWidth; } else { /* align == Alignment.ALIGN_CENTER */ int left = getParagraphLeft(line); int right = getParagraphRight(line); int max = ((int) getLineMax(line)) & ~1; return right - ((right - left) - max) / 2; } }而ViewRootImpl在呼出输入法需要findFocus对应的TextView,然后TextView在计算需要偏移的Rect的时候（getFocusedRect）失败。。(详见下述方法）
@Override public void getFocusedRect(Rect r) { if (mLayout == null) { super.getFocusedRect(r); return; } int selEnd = getSelectionEnd(); if (selEnd < 0) { super.getFocusedRect(r); return; } int selStart = getSelectionStart(); if (selStart < 0 || selStart >= selEnd) { int line = mLayout.getLineForOffset(selEnd); r.top = mLayout.getLineTop(line); r.bottom = mLayout.getLineBottom(line); r.left = (int) mLayout.getPrimaryHorizontal(selEnd) - 2; r.right = r.left + 4; } else { int lineStart = mLayout.getLineForOffset(selStart); int lineEnd = mLayout.getLineForOffset(selEnd); r.top = mLayout.getLineTop(lineStart); r.bottom = mLayout.getLineBottom(lineEnd); if (lineStart == lineEnd) { r.left = (int) mLayout.getPrimaryHorizontal(selStart); r.right = (int) mLayout.getPrimaryHorizontal(selEnd); } else { // Selection extends across multiple lines -- make the focused // rect cover the entire width. if (mHighlightPathBogus) { if (mHighlightPath == null) mHighlightPath = new Path(); mHighlightPath.reset(); mLayout.getSelectionPath(selStart, selEnd, mHighlightPath); mHighlightPathBogus = false; } synchronized (TEMP_RECTF) { mHighlightPath.computeBounds(TEMP_RECTF, true); r.left = (int)TEMP_RECTF.left-1; r.right = (int)TEMP_RECTF.right+1; } } } // Adjust for padding and gravity. int paddingLeft = getCompoundPaddingLeft(); int paddingTop = getExtendedPaddingTop(); if ((mGravity & Gravity.VERTICAL_GRAVITY_MASK) != Gravity.TOP) { paddingTop += getVerticalOffset(false); } r.offset(paddingLeft, paddingTop); int paddingBottom = getExtendedPaddingBottom(); r.bottom += paddingBottom; }
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