一个控件应当使用它的父控件的 LayoutParams 类型。因此,一个 TableVow 应该使用 TableLayout.Params 。
所以,以一个 TableRow 为例:
TableRow tableRow = new TableRow(context); tableRow.setLayoutParams(new TableLayout.LayoutParams( TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.MATCH_PARENT,1.0f));
当我没有指明 LayoutParams 的类型时,TableRow 没有能够自动适应屏幕长度。因为 TableRow 不认识 TableLayout 的大小。所以此时即使设置了 weight 也不好使。
[android-developers] Re: Possible bug in TableLayout
Romain Guy Mon, 16 Feb 2009 19:57:16 -0800
Your code is *NOT* equivalent to the XML. You are using the wrong LayoutParams everywhere. A widget must have the LayoutParams of its *parent*. Therefore, the rows must have TableLayout.LayoutParams, the TextViews must have TableRow.LayoutParams and the TableLayout must have FrameLayout.LayoutParams.
Here is your code, corrected, and it works just fine. package com.test; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.view.View; import android.widget.FrameLayout; import android.widget.TableLayout; import android.widget.TableRow; import android.widget.TextView; public class Test extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(buildTableViewFromSource()); } private View buildTableViewFromSource() { FrameLayout.LayoutParams pTable = new FrameLayout.LayoutParams( TableRow.LayoutParams.FILL_PARENT, TableRow.LayoutParams.FILL_PARENT); TableLayout table = new TableLayout(this); table.setBackgroundColor(Color.RED); table.setLayoutParams(pTable); TableRow rowTop = new TableRow(this); TableLayout.LayoutParams pRowTop = new TableLayout.LayoutParams( TableLayout.LayoutParams.FILL_PARENT, TableLayout.LayoutParams.WRAP_CONTENT); pRowTop.weight = 1; rowTop.setBackgroundColor(Color.BLUE); TextView txt = new TextView(this); txt.setText("Top Content"); rowTop.addView(txt, new TableRow.LayoutParams( TableRow.LayoutParams.FILL_PARENT, TableRow.LayoutParams.WRAP_CONTENT)); TableRow rowBottom = new TableRow(this); rowBottom.setBackgroundColor(Color.GREEN); TextView txtBottom = new TextView(this); txtBottom.setText("Bottom Content"); TableLayout.LayoutParams pRowBottom = new TableLayout.LayoutParams( TableLayout.LayoutParams.WRAP_CONTENT, TableLayout.LayoutParams.WRAP_CONTENT); rowBottom.addView(txtBottom, new TableRow.LayoutParams( TableRow.LayoutParams.FILL_PARENT, TableRow.LayoutParams.WRAP_CONTENT)); table.addView(rowTop, pRowTop); table.addView(rowBottom, pRowBottom); return table; } }
Android 中 LayoutParams 的用法
时间: 2024-10-12 14:20:45