科特林

val density = Resources.getSystem().displayMetrics.density
view.layoutParams.height = 20 * density.toInt()

科特林

val density = Resources.getSystem().displayMetrics.density
view.layoutParams.height = 20 * density.toInt()

简单地创建一个LayoutParams对象并将其分配给imageView

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(150, 150);
imageView.setLayoutParams(params);

我用像素和dp做了这个。

private int dimensionInPixel = 200;

如何按像素设置:

view.getLayoutParams().height = dimensionInPixel;
view.getLayoutParams().width = dimensionInPixel;
view.requestLayout();

dp设置方法:

int dimensionInDp = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dimensionInPixel, getResources().getDisplayMetrics());
view.getLayoutParams().height = dimensionInDp;
view.getLayoutParams().width = dimensionInDp;
view.requestLayout();

希望这对你有所帮助。

int newHeight = 150;
            int newWidth = 150; 
            holder.iv_arrow.requestLayout();
            holder.iv_arrow.getLayoutParams().height = newHeight;
            holder.iv_arrow.getLayoutParams().width = newWidth;
            holder.iv_arrow.setScaleType(ImageView.ScaleType.FIT_XY);
            holder.iv_arrow.setImageResource(R.drawable.video_menu);

动态设置按钮的最佳和最简单的方法是

 Button index=new Button(this);
 int height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 45, getResources().getDisplayMetrics());             
 int width = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 42, getResources().getDisplayMetrics());

上面的高度和宽度以像素为单位px。45是dp的高42是dp的宽。

 index.setLayoutParams(new <Parent>.LayoutParams(width, height));

例如，如果你把你的按钮放在一个tableerow中在一个tableelayout中，你应该把它作为TableRow。LayoutParams

 index.setLayoutParams(new TableRow.LayoutParams(width, height));