Launcher3 Android10.0修改文件夹图标为九宫格_launcher3 九宫格

文件夹图标在Launcher里表示为预览文件夹

1、修改预览文件夹的最大容纳数量为9
ClippedFolderIconLayoutRule.java:

public static final int MAX_NUM_ITEMS_IN_PREVIEW = 9;
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2、判定只要rank小于9，就是可以在预览文件夹里显示的item
FolderIconPreviewVerifier.java:

public boolean isItemInPreview(int page, int rank) {
        if (mGridSize[0] == 1) {
            Log.w(TAG, "setFolderInfo not called before checking if item is in preview.");
        }
        return rank < MAX_NUM_ITEMS_IN_PREVIEW;
    }
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3、改完上面，这里传进来的index就只会是0-8，然后改一下计算位置的方法。
ClippedFolderIconLayoutRule.java:

private static final float MIN_SCALE = 0.2f;
public PreviewItemDrawingParams computePreviewItemDrawingParams(int index, int curNumItems,
        PreviewItemDrawingParams params) {
    float totalScale = scaleForItem();
    float transX;
    float transY;
    float overlayAlpha = 0;
    
    getPosition(index, mTmpPoint);

    transX = mTmpPoint[0];
    transY = mTmpPoint[1];
    if (params == null) {
        params = new PreviewItemDrawingParams(transX, transY, totalScale, overlayAlpha);
    } else {
        params.update(transX, transY, totalScale);
        params.overlayAlpha = overlayAlpha;
    }
    return params;
}

private void getPosition(int index, float[] result) {

    int x = index % 3;
    int y = index / 3;
    float totalLength = mAvailableSpace;
    float iconSize = mIconSize * scaleForItem();
    float padding = (totalLength-(iconSize*3))/4;
    result[0] = (iconSize+padding)*x+padding;
    result[1] = (iconSize+padding)*y+padding;
}

public float scaleForItem() {
    return MIN_SCALE * mBaselineIconScale;
}
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其实到这里就已经就是九宫格了
4、文件夹的图标比正常app图标要小一点，改成和app图标一样大。
DeviceProfile.java:

private void updateIconSize(float scale, Resources res, DisplayMetrics dm) {
    ......
    // Folder icon
    folderIconSizePx = iconSizePx;
    ......
}
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5、设置文件夹图标和标题间距为0。
FolderIcon.java：

public static FolderIcon fromXml(int resId, Launcher launcher, ViewGroup group,
        FolderInfo folderInfo) {
    ......
    lp.topMargin = grid.iconSizePx;
}
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因为之前有设置过app的图标和标题的间距为0，代码如下：
BubbleTextView.java:

public BubbleTextView(Context context, AttributeSet attrs, int defStyle) {
    ......    
if (display == DISPLAY_WORKSPACE) {
        ......
        setCompoundDrawablePadding(0);
        ......
    } else if (display == DISPLAY_ALL_APPS) {
        ......
        setCompoundDrawablePadding(0);
        ......
    } else if (display == DISPLAY_FOLDER) {
        ......
        //这里其实是文件夹PagedView里的app图标，不是文件夹图标
        setCompoundDrawablePadding(0);
        ......
    } 
}
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到这里就改完啦

如果你只改了MAX_NUM_ITEMS_IN_PREVIEW，你的文件夹图标将是下面这种，还能转圈圈哈哈哈哈哈哈