以编程方式在ImageView上放置标签
以编程方式在ImageView上放置标签
提问于 2016-10-13 10:23:46
我正在做一个应用程序来解决sudokus，所以在应用程序中，我使用了一个Imageview，它显示了一个空的9x9网格，我已经将其放置在相对布局中。我正在尝试以编程方式创建界面，所以我想知道的是如何将标签放在Imageview的顶部，以便它们与网格的方块位置相匹配。我知道标签可以放在Imageview的顶部，但不知道如何将它们放在适当的位置。Xamarin是否提供了一种方法来实现这一点，因为我发现的所有方法都是如何将对齐方法与相对布局一起使用。
以下是我到目前为止的代码：
public class GridActivity : Activity
{
// Global Variables
Button startButton;
Button nextButton;
RelativeLayout.LayoutParams startButtonParamsPortrait;
RelativeLayout.LayoutParams startButtonParamsLandscape;
RelativeLayout.LayoutParams nextButtonParamsPortrait;
RelativeLayout.LayoutParams nextButtonParamsLandscape;
protected override void OnCreate(Bundle savedInstanceState)
{
// Don't want the action bar to show, find it unnecessary, so gonna hide it.
ActionBar.Hide();
base.OnCreate(savedInstanceState);
// Create your application here
// get the initial orientation
var surfaceOrientation = WindowManager.DefaultDisplay.Rotation;
RelativeLayout layoutBase = new RelativeLayout(this);
layoutBase.LayoutParameters = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.MatchParent);
layoutBase.SetPadding(100, 100, 100, 100);
// Adding a Imageview to display the sudoku grid
ImageView grid = new ImageView(this);
grid.LayoutParameters = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WrapContent, ViewGroup.LayoutParams.WrapContent);
grid.Visibility = ViewStates.Visible;
grid.SetBackgroundResource(Resource.Drawable.SudokuGrid);
grid.Id = 1;
layoutBase.AddView(grid);
// Adding a button that will be used to step through the "AI"'s solution
nextButton = new Button(this) { Text = "Next" };
nextButton.Id = 2;
// Adding a button that will be used to start the "AI" to solve the puzzle
startButton = new Button(this) { Text = "Start" };
startButton.Id = 3;
// Layout Parameters for Portrait mode
// nextButton
nextButtonParamsPortrait = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WrapContent, ViewGroup.LayoutParams.WrapContent);
nextButtonParamsPortrait.AddRule(LayoutRules.AlignParentBottom);
nextButtonParamsPortrait.AddRule(LayoutRules.AlignParentRight);
// startButton
startButtonParamsPortrait = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WrapContent, ViewGroup.LayoutParams.WrapContent);
startButtonParamsPortrait.AddRule(LayoutRules.AlignParentBottom);
startButtonParamsPortrait.AddRule(LayoutRules.LeftOf, nextButton.Id);
// Layout Parameters for Landscape mode
// startButton
startButtonParamsLandscape = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WrapContent, ViewGroup.LayoutParams.WrapContent);
startButtonParamsLandscape.AddRule(LayoutRules.AlignParentRight);
// nextButton
nextButtonParamsLandscape = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WrapContent, ViewGroup.LayoutParams.WrapContent);
nextButtonParamsLandscape.AddRule(LayoutRules.AlignParentRight);
nextButtonParamsLandscape.AddRule(LayoutRules.Below, startButton.Id);
// Add labels in the location of the squares
// Depending on the initial orientation, the buttons will placed at different locations
if (surfaceOrientation == SurfaceOrientation.Rotation0 || surfaceOrientation == SurfaceOrientation.Rotation180)
{
// The screen is in Portrait mode
startButton.LayoutParameters = startButtonParamsPortrait;
nextButton.LayoutParameters = nextButtonParamsPortrait;
}
else
{
// The screen is in Landscape mode
startButton.LayoutParameters = startButtonParamsLandscape;
nextButton.LayoutParameters = nextButtonParamsLandscape;
}
// Add the buttons to the layout
layoutBase.AddView(startButton);
layoutBase.AddView(nextButton);
// Display the layout to the screen
SetContentView(layoutBase);
}
public override void OnConfigurationChanged(Android.Content.Res.Configuration newConfig)
{
base.OnConfigurationChanged(newConfig);
if (newConfig.Orientation == Android.Content.Res.Orientation.Portrait)
{
startButton.LayoutParameters = startButtonParamsPortrait;
nextButton.LayoutParameters = nextButtonParamsPortrait;
}
else if (newConfig.Orientation == Android.Content.Res.Orientation.Landscape)
{
startButton.LayoutParameters = startButtonParamsLandscape;
nextButton.LayoutParameters = nextButtonParamsLandscape;
}
}回答 2
Stack Overflow用户
发布于 2016-10-13 20:03:52
您可以使用绝对布局将标签放置在布局的其他子项(您的网格)上(必须是较年长的子项)。
Stack Overflow用户
发布于 2016-10-13 12:27:03
您可以使用framelayout来实现这一点。
下面是相同的简单布局。
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:src="@drawable/ic_launcher"
android:scaleType="fitCenter"
android:layout_height="250px"
android:layout_width="250px"/>
<TextView
android:text="Frame Demo"
android:textSize="30px"
android:textStyle="bold"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:gravity="center"/>
</FrameLayout>您也可以通过编程方式在中添加相同的TextView。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40011280
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