android - 动态添加 TableRow 与 getMeasuredHeight/getHeight 的问题

Question

我有一个问题。

我希望将行动态添加到 TableLayout。添加这些行时，我需要能够获取 View 的大小，因此我尝试在 onSizeChanged() 期间执行此操作，但新行不显示。所以我尝试了 onFinishInflate()，但是我无法访问大小 (getMeasuredHeight 返回 0)。

以下代码的输出显示两行 initial row + onFinishInflate getMeasuredHeight=0。但是，如果我使用 sdk 中的 hierarchyviewer 并按 load view hierarchy 然后我突然在模拟器中看到 3 行 initial row + onFinishInflate getMeasuredHeight=0 + onSizeChanged getMeasuredHeight=270!.

Note: This is using emulator 2.1 hvga landscape, code built with latest sdk, targeting android1.5.

---

<?xml version="1.0" encoding="utf-8"?>
<com.steelbytes.android.TableHeightTest.TestLinLay 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TableLayout
        android:id="@+id/table1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        >
        <TableRow
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                >
                <TextView
                    android:text="initial row"
                />
            </TableRow>
        </TableLayout>
</com.steelbytes.android.TableHeightTest.TestLinLay>

---

package com.steelbytes.android.TableHeightTest;

import android.app.Activity;
import android.os.Bundle;

public class TableHeightTest extends Activity
{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

---

package com.steelbytes.android.TableHeightTest;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.LinearLayout;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

public class TestLinLay extends LinearLayout
{
 Context mContext;

 public TestLinLay(Context context, AttributeSet attrs)
 {
  super(context, attrs);
  mContext = context;
 }

    private void addRow(String funcName)
    {
        TableLayout tl = (TableLayout)findViewById(R.id.table1);
        TableRow tr = new TableRow(mContext);
        TextView tv = new TextView(mContext);
        tv.setText(funcName+" getMeasuredHeight="+tl.getMeasuredHeight());
        tr.addView(tv);
        tl.addView(tr);
    }

    @Override
    protected void onFinishInflate()
    {
        super.onFinishInflate();
        addRow("onFinishInflate");
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh)
    {
        super.onSizeChanged(w,h,oldw,oldh);
        addRow("onSizeChanged");
    }
}

---

Answer 1

在调用 getMeasuredWidth/getMeasuredHeight 之前调用 View.measure(int widthMeasureSpec, int heightMeasureSpec)( http://developer.android.com/reference/android/view/View.html#measure%28int,%20int%29 ) 可以很好地测量高度。