四、增加横向逻辑

横向布局与测量：XML实践与代码解析

最新推荐文章于 2025-12-09 16:49:27 发布

原创最新推荐文章于 2025-12-09 16:49:27 发布 · 184 阅读

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#android #orientation #LinearLayout #onLayout #attr

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上一章我们已经增加了指定方向的attr.接下来，接下来我们来看一下，怎么横向测量和布局。

先晒一下我们的xml

  <com.jhzl.customview.MineLineLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:background="@color/black"
        android:layout_gravity="center">

        <EditText
            android:background="@android:color/holo_red_dark"
            android:text="hahah"
            android:layout_width="200dp"
            android:layout_height="@dimen/dp100"/>


        <EditText
            android:background="@android:color/holo_green_dark"
            android:text="hahah"
            android:layout_marginTop="20dp"
            android:layout_marginLeft="20dp"
            android:layout_width="200dp"
            android:layout_height="100dp"/>

        <EditText
            android:background="@android:color/holo_blue_dark"
            android:text="hahah"
            android:layout_width="@dimen/dp250"
            android:layout_height="100dp"/>
    </com.jhzl.customview.MineLineLayout>

横向布局的测量

 private void measureHorizontal(int widthMeasureSpec, int heightMeasureSpec) {
        int totalHeight = 0;
        int totalWidth = 0;
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            //计算最大高度
            totalHeight = Math.max(totalHeight,child.getMeasuredHeight());
            MarginLayoutParams layoutParams = (MarginLayoutParams) child.getLayoutParams();
            //计算总宽度
            totalWidth = totalWidth + ((MarginLayoutParams) layoutParams).leftMargin+child.getMeasuredWidth();
        }
        Log.d(TAG,"totalWidth = "+totalWidth+"  totalHeight = "+totalHeight);
        setMeasuredDimension(totalWidth, totalHeight);
    }

测量完了之后，就是我们熟悉的layout环节了:

 private void horizontalLayout() {
        int curLeft = 0;
        for (int i = 0; i < getChildCount(); i++) {
            View child = getChildAt(i);
            VerticalLayoutParams layoutParams = (VerticalLayoutParams) child.getLayoutParams();
            curLeft = curLeft + layoutParams.leftMargin;
            child.layout(curLeft, 0, curLeft+child.getMeasuredWidth(),  child.getMeasuredHeight());
            curLeft = curLeft + child.getMeasuredWidth();
        }
    }