以编程方式设置 LinearLayout 中的边距

发布于 2024-08-25 19:51:48 字数 923 浏览 7 评论 0原文

我正在尝试使用 Java（而不是 XML）创建一个 LinearLayout，其中的按钮填充屏幕并具有边距。这是没有边距的代码：

LinearLayout buttonsView = new LinearLayout(this);
buttonsView.setOrientation(LinearLayout.VERTICAL);
for (int r = 0; r < 6; ++r) {
    Button btn = new Button(this);
    btn.setText("A");

    LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT); // Verbose!
    lp.weight = 1.0f; // This is critical. Doesn't work without it.
    buttonsView.addView(btn, lp);
}

ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
setContentView(buttonsView, lp);

这样工作得很好，但是你到底如何给按钮留出边距，以便它们之间有空间呢？我尝试使用 LinearLayout.MarginLayoutParams ，但它没有 Weight 成员，所以它不好。如果您在其构造函数中传递 lp ，它也不起作用。

这不可能吗？因为它确实看起来如此，而且它不会是您只能在 XML 中完成的第一个 Android 布局任务。

原文

I'm trying to use Java (not XML) to create a LinearLayout with buttons that fill the screen, and have margins. Here is code that works without margins:

LinearLayout buttonsView = new LinearLayout(this);
buttonsView.setOrientation(LinearLayout.VERTICAL);
for (int r = 0; r < 6; ++r) {
    Button btn = new Button(this);
    btn.setText("A");

    LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT); // Verbose!
    lp.weight = 1.0f; // This is critical. Doesn't work without it.
    buttonsView.addView(btn, lp);
}

ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);
setContentView(buttonsView, lp);

So that works fine, but how on earth do you give the buttons margins so there is space between them? I tried using LinearLayout.MarginLayoutParams, but that has no weight member so it's no good. And it doesn't work if you pass it lp in its constructor either.

Is this impossible? Because it sure looks it, and it wouldn't be the first Android layout task you can only do in XML.

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漫漫岁月 2024-09-01 19:51:48

这是完成它的一些代码：

LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
     LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);

layoutParams.setMargins(30, 20, 30, 0);

Button okButton=new Button(this);
okButton.setText("some text");
ll.addView(okButton, layoutParams);

Here is a little code to accomplish it:

LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
     LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);

layoutParams.setMargins(30, 20, 30, 0);

Button okButton=new Button(this);
okButton.setText("some text");
ll.addView(okButton, layoutParams);

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带刺的爱情 2024-09-01 19:51:48

这样就可以了，但是到底是怎么回事呢？
你给按钮留出边距吗
它们之间有空间吗？

您可以在 LinearLayout.LayoutParams 对象上调用 setMargins()。

我尝试使用
LinearLayout.MarginLayoutParams，但是
没有权重成员，所以它不是
很好。

LinearLayout.LayoutParams 是 LinearLayout.MarginLayoutParams 的子类，如文档。

这不可能吗？

不。

这不是第一个 Android
只能在 XML 中完成的布局任务

欢迎您提供此声明的证明。

就我个人而言，我不知道有什么事情只能通过 XML 来完成，而不能通过 SDK 中的 Java 方法来完成。事实上，根据定义，一切都必须通过 Java 来完成（尽管不一定通过 SDK 可访问的方法），因为 XML 不是可执行代码。但是，如果您知道某些事情，请指出来，因为这是 SDK 中的一个错误，有一天应该会得到修复。

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花海 2024-09-01 19:51:48

要直接向项目添加边距（某些项目允许直接编辑边距），您可以执行以下操作：

LayoutParams lp = ((ViewGroup) something).getLayoutParams();
if( lp instanceof MarginLayoutParams )
{
    ((MarginLayoutParams) lp).topMargin = ...;
    ((MarginLayoutParams) lp).leftMargin = ...;
    //... etc
}
else
    Log.e("MyApp", "Attempted to set the margins on a class that doesn't support margins: "+something.getClass().getName() );

...这无需了解/编辑周围的布局即可工作。请注意“instanceof”检查，以防您尝试针对不支持边距的内容运行此检查。

To add margins directly to items (some items allow direct editing of margins), you can do:

LayoutParams lp = ((ViewGroup) something).getLayoutParams();
if( lp instanceof MarginLayoutParams )
{
    ((MarginLayoutParams) lp).topMargin = ...;
    ((MarginLayoutParams) lp).leftMargin = ...;
    //... etc
}
else
    Log.e("MyApp", "Attempted to set the margins on a class that doesn't support margins: "+something.getClass().getName() );

...this works without needing to know about / edit the surrounding layout. Note the "instanceof" check in case you try and run this against something that doesn't support margins.

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清泪尽 2024-09-01 19:51:48

由于设备屏幕像素密度的变化，最好始终使用 DIP 单元以编程方式设置边距。就像下面_

//get resources
Resources r = getResources();
float pxLeftMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, r.getDisplayMetrics());
float pxTopMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, r.getDisplayMetrics());
float pxRightMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, r.getDisplayMetrics());
float pxBottomMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, r.getDisplayMetrics());

//get layout params...
LayoutParams params=new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
params.setMargins(Math.round(pxLeftMargin), Math.round(pxTopMargin), Math.round(pxRightMargin), Math.round(pxBottomMargin));

//set margin...
yourLayoutTOsetMargin.setLayoutParams(params);

希望这会有所帮助。

Due to variation in device screen pixel densities its good to always use DIP unit to set margin programmatically. Like below_

//get resources
Resources r = getResources();
float pxLeftMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, r.getDisplayMetrics());
float pxTopMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, r.getDisplayMetrics());
float pxRightMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, r.getDisplayMetrics());
float pxBottomMargin = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, r.getDisplayMetrics());

//get layout params...
LayoutParams params=new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
params.setMargins(Math.round(pxLeftMargin), Math.round(pxTopMargin), Math.round(pxRightMargin), Math.round(pxBottomMargin));

//set margin...
yourLayoutTOsetMargin.setLayoutParams(params);

Hope this will help.

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最丧也最甜 2024-09-01 19:51:48

我已经直接使用下面的代码设置了边距，

LinearLayout layout = (LinearLayout)findViewById(R.id.yourrelative_layout);
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);            
params.setMargins(3, 300, 3, 3); 
layout.setLayoutParams(params);

这里唯一需要注意的是，应该为以下包 android.widget.RelativeLayout.LayoutParams 导入 LayoutParams，否则将会出现一个错误。

I have set up margins directly using below code

LinearLayout layout = (LinearLayout)findViewById(R.id.yourrelative_layout);
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);            
params.setMargins(3, 300, 3, 3); 
layout.setLayoutParams(params);

Only thing here is to notice that LayoutParams should be imported for following package android.widget.RelativeLayout.LayoutParams, or else there will be an error.

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网名女生简单气质 2024-09-01 19:51:48

 MarginLayoutParams layoutParams = (MarginLayoutParams) getLayoutParams();
 layoutParams.setMargins(leftMargin, topMargin, rightMargin, bottomMargin);

 MarginLayoutParams layoutParams = (MarginLayoutParams) getLayoutParams();
 layoutParams.setMargins(leftMargin, topMargin, rightMargin, bottomMargin);

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只是我以为 2024-09-01 19:51:48

试试这个

 LayoutParams params = new LayoutParams(
            LayoutParams.WRAP_CONTENT,      
            LayoutParams.WRAP_CONTENT
    );
    params.setMargins(left, top, right, bottom);
    yourbutton.setLayoutParams(params);

Try this

 LayoutParams params = new LayoutParams(
            LayoutParams.WRAP_CONTENT,      
            LayoutParams.WRAP_CONTENT
    );
    params.setMargins(left, top, right, bottom);
    yourbutton.setLayoutParams(params);

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吾性傲以野 2024-09-01 19:51:48

试试这个：

MarginLayoutParams params = (MarginLayoutParams) view.getLayoutParams();
params.width = 250;
params.leftMargin = 50;
params.topMargin = 50;

Try this:

MarginLayoutParams params = (MarginLayoutParams) view.getLayoutParams();
params.width = 250;
params.leftMargin = 50;
params.topMargin = 50;

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森林迷了鹿 2024-09-01 19:51:48

/*
 * invalid margin
 */
private void invalidMarginBottom() {
    RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) frameLayoutContent.getLayoutParams();
    lp.setMargins(0, 0, 0, 0);
    frameLayoutContent.setLayoutParams(lp);
}

你应该注意视图的viewGroup的类型。例如，在上面的代码中，我想更改frameLayout的边距，而frameLayout的视图组是一个RelativeLayout，所以你需要转换为(RelativeLayout.LayoutParams)

/*
 * invalid margin
 */
private void invalidMarginBottom() {
    RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) frameLayoutContent.getLayoutParams();
    lp.setMargins(0, 0, 0, 0);
    frameLayoutContent.setLayoutParams(lp);
}

you should be ware of the type of the view's viewGroup.In the code above, for example,I want to change the frameLayout's margin,and the frameLayout's view group is a RelativeLayout，so you need to covert to (RelativeLayout.LayoutParams)

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等待我真够勒 2024-09-01 19:51:48

这是单行解决方案：

((LinearLayout.LayoutParams) yourLinearLayout.getLayoutParams()).marginToAdd = ((int)(Resources.getSystem().getDisplayMetrics().density * yourDPValue));

Here a single line Solution:

((LinearLayout.LayoutParams) yourLinearLayout.getLayoutParams()).marginToAdd = ((int)(Resources.getSystem().getDisplayMetrics().density * yourDPValue));

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寂寞陪衬 2024-09-01 19:51:48

Core-KTX：

 updateLayoutParams<RecyclerView.LayoutParams> {
                topMargin = 10
                rightMargin = 10
                bottomMargin = 10
                leftMargin = resources.getDimensionPixelSize(R.dimen.left)
            }

使用 ViewGroup 上的任何视图来代替 RecycleView。

Core-KTX:

 updateLayoutParams<RecyclerView.LayoutParams> {
                topMargin = 10
                rightMargin = 10
                bottomMargin = 10
                leftMargin = resources.getDimensionPixelSize(R.dimen.left)
            }

Instead of RecycleView, use whatever your view is on ViewGroup.

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