如何从代码中动态设置layout_weight属性？

Question

如何layout_weight从java代码中动态设置android中按钮的属性值？

Answer 1

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.

Answer 2

用途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!

Answer 3

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.

Answer 4

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);
childParam2.weight = 0.7f;
child2.setLayoutParams(childParam2);

parent.setWeightSum(1f);
parent.addView(child1);
parent.addView(child2);

Answer 5

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.

Answer 6

如果layoutparams已经定义（在 XML 中或动态），这是一个单行：

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

Answer 7

任何LinearLayout.LayoutParams和TableLayout.LayoutParams我一起工作,对于正确的按钮TableRow.LayoutParams.那是:

            TableRow.LayoutParams buttonParams = new TableRow.LayoutParams(
                    TableRow.LayoutParams.MATCH_PARENT,
                    TableRow.LayoutParams.WRAP_CONTENT, 1f);

关于使用MATCH_PARENT或WRAP_CONTENT相同.