[移动开发]SystemUI快捷设置栏（1）

问题描述

客户需求：

竖屏时快捷设置栏一行6个、横屏时快捷设置栏一行8个；
竖屏时快捷栏展开一行5个、横屏时快捷栏展开一行8个。

vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/qs/QuickQSPanel.java
@Override
        protected void onLayout(boolean changed, int l, int t, int r, int b) {
            // We only care about clipping on the right side
            mClippingBounds.set(0, 0, r - l, 10000);
            setClipBounds(mClippingBounds);

            calculateColumns();

            for (int i = 0; i < mRecords.size(); i++) {
            	//这里设置gone掉多余的显示
                mRecords.get(i).tileView.setVisibility( i < getResources().getInteger(R.integer.quick_qs_panel_columns) ? View.VISIBLE : View.GONE);
            }

            setAccessibilityOrder();
            layoutTileRecords(mColumns);
        }
private boolean calculateColumns() {
            int prevNumColumns = mColumns;
            //这里修改最大显示个数
            int maxTiles = /*mRecords.size()*/getResources().getInteger(R.integer.quick_qs_panel_columns);

            if (maxTiles == 0){ // Early return during setup
                mColumns = 0;
                return true;
            }

            final int availableWidth = getMeasuredWidth() - getPaddingStart() - getPaddingEnd();
            final int leftoverWhitespace = availableWidth - maxTiles * mCellWidth;
            final int smallestHorizontalMarginNeeded;
            smallestHorizontalMarginNeeded = leftoverWhitespace / Math.max(1, maxTiles - 1);

            if (smallestHorizontalMarginNeeded > 0){
                mCellMarginHorizontal = smallestHorizontalMarginNeeded;
                mColumns = maxTiles;
            } else{
                mColumns = mCellWidth == 0 ? 1 :
                        Math.min(maxTiles, availableWidth / mCellWidth );
                // If we can only fit one column, use mCellMarginHorizontal to center it.
                if (mColumns == 1) {
                    mCellMarginHorizontal = (availableWidth - mCellWidth) / 2;
                } else {
                    mCellMarginHorizontal =
                            (availableWidth - mColumns * mCellWidth) / (mColumns - 1);
                }

            }
            return mColumns != prevNumColumns;
        }

存在问题：

当用户手动删除多余的快捷设置图标，只剩下6个的时候。
这时候如果切换横屏，因为横屏要显示8个，maxTiles = 8 ，mColumns = 8。

1、vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/qs/TileLayout.java
layoutTileRecords(mColumns);中，就会数组越界。

2、vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/qs/QuickQSPanel.java
public void setListening(boolean listening)数组越界。

编辑展开一行显示的个数
<integer name="quick_settings_num_columns">5</integer>

快捷设置栏最少图标总数，长按拖出到小于6时，会提示并拖拽失败
<integer name="quick_settings_min_num_tiles">6</integer>