Android 如何使用代码而不是 xml 设置 ImageView 的边距

How to set margin of ImageView using code, not xml

提问by Bruce Lee

I want to add an unknown number of ImageViewviews to my layout with margin. In XML, I can use layout_marginlike this:

我想ImageView用边距向我的布局添加未知数量的视图。在 XML 中，我可以这样使用layout_margin：

<ImageView android:layout_margin="5dip" android:src="@drawable/image" />

<ImageView android:layout_margin="5dip" android:src="@drawable/image" />

There is ImageView.setPadding(), but no ImageView.setMargin(). I think it's along the lines of ImageView.setLayoutParams(LayoutParams), but not sure what to feed into that.

有ImageView.setPadding()，但没有ImageView.setMargin()。我认为它与ImageView.setLayoutParams(LayoutParams)，但不知道该输入什么。

Does anyone know?

有人知道吗？

回答by Key

android.view.ViewGroup.MarginLayoutParamshas a method setMargins(left, top, right, bottom). Direct subclasses are: FrameLayout.LayoutParams, LinearLayout.LayoutParamsand RelativeLayout.LayoutParams.

android.view.ViewGroup.MarginLayoutParams有方法setMargins(left, top, right, bottom)。直接子类是：FrameLayout.LayoutParams,LinearLayout.LayoutParams和RelativeLayout.LayoutParams。

Using e.g. LinearLayout:

使用例如LinearLayout：

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(left, top, right, bottom);
imageView.setLayoutParams(lp);

MarginLayoutParams

边距布局参数

This sets the margins in pixels. To scale it use

这以像素为单位设置边距。要扩展它使用

context.getResources().getDisplayMetrics().density

DisplayMetrics

显示指标

回答by Kevin Wadera

    image = (ImageView) findViewById(R.id.imageID);
    MarginLayoutParams marginParams = new MarginLayoutParams(image.getLayoutParams());
    marginParams.setMargins(left_margin, top_margin, right_margin, bottom_margin);
    RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(marginParams);
    image.setLayoutParams(layoutParams);

回答by Kelevandos

All the above examples will actually REPLACEany params already present for the View, which may not be desired. The below code will just extend the existing params, without replacing them:

上面的所有示例实际上都会替换View 已经存在的任何参数，这可能不是我们想要的。下面的代码只会扩展现有的参数，而不替换它们：

ImageView myImage = (ImageView) findViewById(R.id.image_view);
MarginLayoutParams marginParams = (MarginLayoutParams) image.getLayoutParams();
marginParams.setMargins(left, top, right, bottom);

回答by Adam Stelmaszczyk

Kevin's code creates redundant MarginLayoutParamsobject. Simpler version:

Kevin 的代码创建了冗余MarginLayoutParams对象。更简单的版本：

ImageView image = (ImageView) findViewById(R.id.main_image);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(image.getLayoutParams());
lp.setMargins(50, 100, 0, 0);
image.setLayoutParams(lp);

回答by CommonSenseCode

If you want to change imageview margin but leave all other margins intact.

如果您想更改图像视图边距但保留所有其他边距不变。

1. Get MarginLayoutParameters of your image view in this case: myImageView

    MarginLayoutParams marginParams = (MarginLayoutParams) myImageView.getLayoutParams();
   

2. Now just change the margin you want to change but leave the others as they are:

    marginParams.setMargins(marginParams.leftMargin, 
                            marginParams.topMargin, 
                            150, //notice only changing right margin
                            marginParams.bottomMargin); 
   

1. 在这种情况下获取图像视图的 MarginLayoutParameters： myImageView

    MarginLayoutParams marginParams = (MarginLayoutParams) myImageView.getLayoutParams();
   

2. 现在只需更改您想要更改的边距，但保持其他不变：

    marginParams.setMargins(marginParams.leftMargin, 
                            marginParams.topMargin, 
                            150, //notice only changing right margin
                            marginParams.bottomMargin); 
   

回答by Elnoor

I use simply this and works great:

我简单地使用这个并且效果很好：

ImageView imageView = (ImageView) findViewById(R.id.image_id);
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) imageView.getLayoutParams();
layoutParams.setMargins(left, top, right, bottom);
imageView.setLayoutParams(layoutParams);

setMargins()'s unit is pixel not dp. If you want to set margin in dp, just inside your values/dimens.xmlfile create your dimensions like:

setMargins()的单位是像素而不是 dp。如果你想在 dp 中设置边距，就在你的values/dimens.xml文件中创建你的尺寸，如：

<resources>
    <dimen name="right">16dp</dimen>
    <dimen name="left">16dp</dimen>    
</resources>

and access like:

并访问如：

getResources().getDimension(R.dimen.right);

回答by divonas

You can use this method, in case you want to specify margins in dp:

如果要在 dp 中指定边距，可以使用此方法：

private void addMarginsInDp(View view, int leftInDp, int topInDp, int rightInDp, int bottomInDp) {
    DisplayMetrics dm = view.getResources().getDisplayMetrics();
    LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    lp.setMargins(convertDpToPx(leftInDp, dm), convertDpToPx(topInDp, dm), convertDpToPx(rightInDp, dm), convertDpToPx(bottomInDp, dm));
    view.setLayoutParams(lp);
}

private int convertDpToPx(int dp, DisplayMetrics displayMetrics) {
    float pixels = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, displayMetrics);
    return Math.round(pixels);
}

回答by enyciaa

If you use kotlin, this can be simplified by creating an extension function

如果你使用 kotlin，这可以通过创建一个扩展函数来简化

fun View.setMarginExtensionFunction(left: Int, top: Int, right: Int, bottom: Int) {
  val params = layoutParams as ViewGroup.MarginLayoutParams
  params.setMargins(left, top, right, bottom)
  layoutParams = params
}

Now all you need is a view, and this extension function can be used anywhere.

现在你只需要一个视图，这个扩展功能可以在任何地方使用。

val imageView = findViewById(R.id.imageView)
imageView.setMarginExtensionFunction(0, 0, 0, 0)

回答by Muhammad Adil

create layout dynamically and set its parameter as setmargin() will not work directly on an imageView

动态创建布局并将其参数设置为 setmargin() 不会直接在 imageView 上工作

ImageView im;
im = (ImageView) findViewById(R.id.your_image_in_XML_by_id);
 RelativeLayout.LayoutParams layout = new RelativeLayout.LayoutParams(im.getLayoutParams());
                        layout.setMargins(counter*27, 0, 0, 0);//left,right,top,bottom
                        im.setLayoutParams(layout);
                        im.setImageResource(R.drawable.yourimage)

回答by Wahib Ul Haq

For me this worked:

对我来说这有效：

int imgCarMarginRightPx = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, definedValueInDp, res.getDisplayMetrics());

MarginLayoutParams lp = (MarginLayoutParams) imgCar.getLayoutParams();
lp.setMargins(0,0,imgCarMarginRightPx,0);
imgCar.setLayoutParams(lp);