在屏幕底部创建水平滚动视图的线性布局

Question

我正在尝试创建一个5x5表格，其中的按钮占据了屏幕70%的空间。在这个下面，我想用滚动条水平放置按钮（在屏幕底部，这意味着）。java和xml文件如下所示。在输出屏幕上，我只能看到创建的5x5表格，底部空白。我是安卓和布局的新手，所以请帮我做这件事。谢谢

xml文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
<TableLayout
    android:id="@+id/mainPage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">        
</TableLayout>
<HorizontalScrollView
    android:id="@+id/hsvMain"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">          
    <LinearLayout
        android:id="@+id/scroll_ll"
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:isScrollContainer="true"
        android:scrollbars="horizontal"
        android:orientation="horizontal">
        </LinearLayout>     
    </HorizontalScrollView>

</LinearLayout>

Java文件：

protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.match_main_skl);
    table = new TableLayout (this);
    setControls();
    hsv = new HorizontalScrollView(this);
    ll = new LinearLayout(this);
    mainTable();
}
private void setControls()
{
    table = (TableLayout) findViewById(R.id.mainPage);
    hsv = (HorizontalScrollView) findViewById(R.id.hsvMain);
    ll = (LinearLayout) findViewById(R.id.scroll_ll);
}
private void mainTable()
{
    //find screen size of the device (supports all versions)
    Point windowSize = MAUIUtil.GetDefaultWindowSize(this);  
    int cellSize;
    if (windowSize.x >= 0.70 * windowSize.y)
        cellSize = windowSize.x / numColumns;
        else cellSize = (int) ((0.70*windowSize.y)/numColumns);

**//5x5 TABLE**
    TableRow.LayoutParams buttonRow = new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT, TableRow.LayoutParams.MATCH_PARENT, 1.0f);
    buttonRow.height = cellSize * numRows;
    //buttonRow.height = windowSize.x;
    table.setLayoutParams(buttonRow);
    table.setStretchAllColumns(true);

    for(int rw = 0; rw < numRows; rw++)
    {
        TableRow row = new TableRow(this);
        row.setPadding(0, 0, 0, 0); //setPadding(left,top,right,bottom)
        row.setId(ROW_ID_OFFSET + rw);//giving each row an id
        TableLayout.LayoutParams tbLp = new TableLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT,1.0f);
        tbLp.height = cellSize;
        table.setLayoutParams(tbLp);
        for(int col = 0; col < numColumns; col++)
        {
            int btnID = COLUMN_ID_OFFSET + (numColumns * (rw - 1)) +  col;
            //Adding buttons
            Button btn = new Button(this);
            btn.setId(btnID);
            btn.setPadding(0, 0, 0, 0);
            btn.setTypeface(Typeface.DEFAULT_BOLD);
            btn.setBackgroundColor(Color.CYAN);
            btn.setText(Integer.toString(btnID));
            row.addView(btn);   
        }
        table.addView(row);
    }
    **//LAST SCROLLABLE HORIZONTAL ROW**
    hsv.addView(ll);
    LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT, 1.0f);
    llp.height = windowSize.y - cellSize;
    hsv.setLayoutParams(llp);
    LinearLayout sll = new LinearLayout(this);
    for(int col = 0; col < scrNumColumns; col++)
    {
        int btnID = SCROLL_COLUMN_ID_OFFSET + col;
        //Adding buttons
        Button btn = new Button(this);
        btn.setId(btnID);
        btn.setPadding(0, 0, 0, 0);
        btn.setTypeface(Typeface.DEFAULT_BOLD);
        btn.setBackgroundColor(Color.RED);
        btn.setText(Integer.toString(btnID));
        sll.addView(btn);   
        sll.setGravity(Gravity.BOTTOM);
    } 
    ll.addView(sll);
 }

Answer 1

在onCreate（）方法中调用findViewById（）之后，似乎创建了一个新的LinearLayout和一个新HorizontalScrollView。因此，您操作的是新创建的视图，而不是.xml文件中定义的视图。

尝试删除这些行：

hsv = new HorizontalScrollView(this);
ll = new LinearLayout(this);

Answer 2

使用以下代码。我已经按照你所描述的实施了它。

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/LinearLayout1"
 android:layout_width="match_parent"
 android:layout_height="match_parent" 

 >
<TableLayout
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 >
  <TableRow > </TableRow>
  <TableRow > </TableRow>
  <TableRow > </TableRow>
  <TableRow > </TableRow>
  <TableRow > </TableRow>

 </TableLayout>   
<HorizontalScrollView 
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:layout_alignParentBottom="true" >
 <LinearLayout 
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="horizontal">
 <Button
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="Button1"/>
  <Button
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="Button2"/>
   <Button
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="Button3"/>
    <Button
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="Button4"/>
     <Button
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="Button5"/>

       </LinearLayout>
</HorizontalScrollView>

</RelativeLayout>

希望它能有所帮助。您可以询问是否有任何进一步的疑问。

Answer 3

在线性布局中使用android:alain_parentBottom="true"。您将实现您想要的。