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Android LinearLayout 中优先压缩TextVi

Android LinearLayout 中优先压缩TextVi

作者: sierwan | 来源:发表于2023-05-07 16:59 被阅读0次

    要做一个文案在左边,icon在右边的控件,要求文案很长View宽度不够时,压缩文案。
    参考了"无梦"的文章,发现Android源码中已经有解决方案EllipsizeLayout,怕忘特做一个记录:

    package com.android.deskclock.widget;
    import android.content.Context;
    import android.util.AttributeSet;
    import android.view.View;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    /**
     * When this layout is in the Horizontal orientation and one and only one child
     * is a TextView with a non-null android:ellipsize, this layout will reduce
     * android:maxWidth of that TextView to ensure the other children are within the
     * layout. This layout has no effect if the children have weights.
     */
    public class EllipsizeLayout extends LinearLayout {
        public EllipsizeLayout(Context context) {
            this(context, null);
        }
        public EllipsizeLayout(Context context, AttributeSet attrs) {
            super(context, attrs);
        }
        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            if (getOrientation() == HORIZONTAL
                    && (MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY)) {
                int totalLength = 0;
                boolean outOfSpec = false;
                TextView ellipView = null;
                final int count = getChildCount();
                for (int ii = 0; ii < count && !outOfSpec; ++ii) {
                    final View child = getChildAt(ii);
                    if (child != null && child.getVisibility() != GONE) {
                        if (child instanceof TextView) {
                            final TextView tv = (TextView) child;
                            if (tv.getEllipsize() != null) {
                                if (ellipView == null) {
                                    ellipView = tv;
                                    // clear maxWidth on mEllipView before measure
                                    ellipView.setMaxWidth(Integer.MAX_VALUE);
                                } else {
                                    // TODO: support multiple android:ellipsize
                                    outOfSpec = true;
                                }
                            }
                        }
                        final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) child
                                .getLayoutParams();
                        outOfSpec |= (lp.weight > 0f);
                        measureChildWithMargins(child, widthMeasureSpec, 0, heightMeasureSpec, 0);
                        totalLength += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
                    }
                }
                outOfSpec |= (ellipView == null) || (totalLength == 0);
                final int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
                if (!outOfSpec && totalLength > parentWidth) {
                    int maxWidth = ellipView.getMeasuredWidth() - (totalLength - parentWidth);
                    // TODO: Respect android:minWidth (easy with @TargetApi(16))
                    int minWidth = 0;
                    if (maxWidth < minWidth) {
                        maxWidth = minWidth;
                    }
                    ellipView.setMaxWidth(maxWidth);
                }
            }
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }
    

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