以编程方式设置ImageView的宽度和高度？

Question

如何以ImageView编程方式设置宽度和高度？

Answer 1

可能为时已晚,但为了遇到同样问题的其他人,要设置ImageView的高度:

image_view.getLayoutParams().height = 20;

希望这可以帮助.

重要.如果您在布局已经"布局"后设置高度,请确保同时调用:

image_view.requestLayout()

Answer 2

如果您的图像视图是动态的,则包含getLayout的答案将失败并显示null异常.

在这种情况下,正确的方法是:

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100, 100);
iv.setLayoutParams(layoutParams);

Answer 3

这个简单的方法来完成你的任务:

setContentView(R.id.main);    
ImageView iv = (ImageView) findViewById(R.id.left);
int width = 60;
int height = 60;
LinearLayout.LayoutParams parms = new LinearLayout.LayoutParams(width,height);
iv.setLayoutParams(parms);

另一种方法,如果你想给出屏幕尺寸的高度和宽度,那么使用下面的代码:

setContentView(R.id.main);    
Display display = getWindowManager().getDefaultDisplay();
ImageView iv = (LinearLayout) findViewById(R.id.left);
int width = display.getWidth(); // ((display.getWidth()*20)/100)
int height = display.getHeight();// ((display.getHeight()*30)/100)
LinearLayout.LayoutParams parms = new LinearLayout.LayoutParams(width,height);
iv.setLayoutParams(parms);

希望充分利用你.

Answer 4

我用pixel和玩过这个dp.

private int dimensionInPixel = 200;

如何按像素设置:

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

如何通过dp设置:

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

希望这会对你有所帮助.

Answer 5

如果您需要将宽度或高度设置为match_parent(与其父级一样大)或wrap_content(大到足以适合其内部内容),则需要ViewGroup.LayoutParams设置以下两个常量:

imageView.setLayoutParams(
    new ViewGroup.LayoutParams(
        // or ViewGroup.LayoutParams.WRAP_CONTENT
        ViewGroup.LayoutParams.MATCH_PARENT,      
        // or ViewGroup.LayoutParams.WRAP_CONTENT,     
        ViewGroup.LayoutParams.MATCH_PARENT ) );

或者你可以像在Hakem Zaied的回答中那样设置它们:

imageView.getLayoutParams().width = ViewGroup.LayoutParams.MATCH_PARENT;
//...

Answer 6

您可以为所有案例设置值.

demoImage.getLayoutParams().height = 150;

demoImage.getLayoutParams().width = 150;

demoImage.setScaleType(ImageView.ScaleType.FIT_XY);

Answer 7

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());

上述高度和宽度以像素为单位px.45是dp的高度,42是dp的宽度.

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

因此,例如,如果您将按钮放在TableLayout中的TableRow中,则应将其设置为TableRow.LayoutParams

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

Answer 8

只需创建一个LayoutParams对象并将其分配给您的imageView

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

Answer 9

image.setLayoutParams(new ViewGroup.LayoutParams(宽度, 高度));

例子：

image.setLayoutParams(new ViewGroup.LayoutParams(150, 150));

Answer 10

image_view.getLayoutParams().height 

返回以像素为单位的高度值。您需要先获取屏幕尺寸才能正确设置值。

 Display display = context.getWindowManager().getDefaultDisplay();
 DisplayMetrics outMetrics = new DisplayMetrics();
 display.getMetrics(outMetrics);
 int screen_height = outMetrics.heightPixels;
 int screen_width = outMetrics.widthPixels;

获得屏幕尺寸后，可以使用适当的边距设置imageview的宽度和高度。

 view.getLayoutParams().height = screen_height - 140;
 view.getLayoutParams().width = screen_width - 130 ;