how to change programmatically?

2018-07-03 11:36:34

This is my view, and I wish to change layout_width to "10dip". How do I do so programmatically? Note, this is not a Linear Layout, it's a view.

<View android:id="@+id/nutrition_bar_filled" 
  android:background="@drawable/green_rectangle" 
  android:layout_height="30dip"
  android:layout_width="50dip">
</View>

I know about LayoutParams. How do I use it to set the width to 10dip?

我相信你的问题是动态改变视图的宽度，而上面的方法会将布局属性完全更改为新的布局属性，所以我建议首先从视图中获取LayoutParams，然后在layoutParmas上设置宽度，最后将layoutparams设置为视图，以下下面的步骤做同样的事情。

View view_instance = (View)findViewById(R.id.nutrition_bar_filled);
LayoutParams params=view_instance.getLayoutParams();
params.width=newOne;
view_instance.setLayoutParams(params);

你也可以像这样设置高度和宽度：

viewinstance.setLayoutParams(new LayoutParams(width, height));

try using

View view_instance = (View)findViewById(R.id.nutrition_bar_filled);
view_instance.setWidth(10);

use Layoutparams to do so where you can set width and height like below.

LayoutParams lp = new LayoutParams(10,LayoutParams.wrap_content);
View_instance.setLayoutParams(lp);

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