android - 如何从代码中动态设置layout_weight属性？

如何从java代码动态设置android中的按钮属性layout_weight的值？

9个解决方案

377 votes

您可以将其作为LinearLayout.LayoutParams构造函数的一部分传递：

LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(

LayoutParams.MATCH_PARENT,

LayoutParams.MATCH_PARENT,

1.0f

);

YOUR_VIEW.setLayoutParams(param);

最后一个参数是重量。

Erich Douglass answered 2019-03-16T13:48:22Z

108 votes

使用LinearLayout.LayoutParams：

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(

LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);

params.weight = 1.0f;

Button button = new Button(this);

button.setLayoutParams(params);

编辑：啊，Erich的答案更容易！

kcoppock answered 2019-03-16T13:48:54Z

74 votes

如果您已经在layout(xml)文件中定义了视图，只想以编程方式更改权重，这种方式更好

LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)

mButton.getLayoutParams();

params.weight = 1.0f;

mButton.setLayoutParams(params);

new a LayoutParams会覆盖您在xml文件中定义的其他参数，如margin，或者您需要在LayoutParams中指定所有这些参数。

pkliang answered 2019-03-16T13:49:28Z

19 votes

如果宽度，高度和重量的构造函数不起作用，请尝试使用宽度和高度的构造函数。 然后手动设置重量。

如果要根据权重设置宽度，请在构造函数中将width设置为0。 同样适用于身高。下面的代码适合我。

LinearLayout.LayoutParams childParam1 = new LinearLayout.LayoutParams(0,LinearLayout.LayoutParams.MATCH_PARENT);

childParam1.weight = 0.3f;

child1.setLayoutParams(childParam1);

LinearLayout.LayoutParams childParam2 = new LinearLayout.LayoutParams(0,LinearLayout.LayoutParams.MATCH_PARENT);

childParam1.weight = 0.7f;

child2.setLayoutParams(childParam2);

parent.setWeightSum(1f);

parent.addView(child1);

parent.addView(child2);

Ganindu answered 2019-03-16T13:50:02Z

12 votes

如果我有人在寻找答案，请使用：

LinearLayout.LayoutParams lay = (LinearLayout.LayoutParams) myLayout.getLayoutParams();

lay.weight = 0.5;

如果要从xml文件初始化布局，这比为线性布局提供新的布局参数要方便得多。

ash1103 answered 2019-03-16T13:50:35Z

6 votes

任何MATCH_PARENT和WRAP_CONTENT为我工作，对于按钮右边的是TableRow.LayoutParams.这是：

TableRow.LayoutParams buttonParams = new TableRow.LayoutParams(

TableRow.LayoutParams.MATCH_PARENT,

TableRow.LayoutParams.WRAP_CONTENT, 1f);

关于使用MATCH_PARENT或WRAP_CONTENT是一样的。

gantzer89 answered 2019-03-16T13:51:10Z

2 votes

如果您已经在布局(xml)文件中定义了视图并且只想以编程方式更改权重，那么创建新的LayoutParams将覆盖您在xml文件中定义的其他参数。

首先你应该使用“getLayoutParams”然后使用setLayoutParams

LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) mButton.getLayoutParams();

params.weight = 4f;

mButton.setLayoutParams(params);

Shirish Herwade answered 2019-03-16T13:51:51Z

1 votes

如果已经定义了layoutparams(以XML或动态方式)，这是一个单行：

((LinearLayout.LayoutParams) mView.getLayoutParams()).weight = 1;

SolidSnake answered 2019-03-16T13:52:20Z

0 votes

使用Kotlin你可以做类似的事情：

import android.content.Context

import android.support.v4.content.ContextCompat

import android.support.v7.widget.CardView

import android.widget.*

import android.widget.LinearLayout

class RespondTo : CardView {

constructor(context: Context) : super(context) {

init(context)

}

private fun init(context: Context) {

val parent = LinearLayout(context)

parent.apply {

layoutParams = LinearLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,

FrameLayout.LayoutParams.WRAP_CONTENT, 1.0f).apply {

orientation = LinearLayout.HORIZONTAL

addView(EditText(context).apply {

id = generateViewId()

layoutParams = LinearLayout.LayoutParams(0,

LinearLayout.LayoutParams.WRAP_CONTENT, 0.9f).apply {

}

})

addView(ImageButton(context).apply({

layoutParams = LinearLayout.LayoutParams(0,

LinearLayout.LayoutParams.WRAP_CONTENT, 0.1f)

background = null

setImageDrawable(ContextCompat.getDrawable(context, R.drawable.ic_save_black_24px))

id = generateViewId()

layoutParams = RelativeLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,

LinearLayout.LayoutParams.WRAP_CONTENT).apply {

addRule(RelativeLayout.ALIGN_PARENT_RIGHT)

// addRule(RelativeLayout.LEFT_OF, myImageButton.id)

}

}))

}

}

this.addView(parent)

}

}

Hasan A Yousef answered 2019-03-16T13:52:49Z