20

我正在尝试以编程方式RelativeLayout在我的活动中添加一个边距顶部。使用 xml 我可以在这种模式下执行此操作：android:layout_marginTop="10dp"，但是当我尝试以编程方式执行此操作时，没有任何变化……正如您所看到的，我在一个容器中使用了一些RelativeLayout（有一个 for 循环） 。LinearLayout

这是我正在使用的代码：

//LINEAR LAYOUT
LinearLayout linearLayout = new LinearLayout(this);
linearLayout.setOrientation(LinearLayout.VERTICAL);
linearLayout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
        LinearLayout.LayoutParams.WRAP_CONTENT));

for (int i=1; i<=3; i++){
    //RELATIVE LAYOUT
    RelativeLayout relativeLayout = new RelativeLayout(this);
    relativeLayout.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,
            RelativeLayout.LayoutParams.FILL_PARENT));
    relativeLayout.setBackgroundColor(getResources().getColor(R.color.grayColor));

    //CODE FOR ADD MARGINS
    RelativeLayout.LayoutParams relativeParams = (RelativeLayout.LayoutParams)relativeLayout.getLayoutParams();
    relativeParams.topMargin=80;
    relativeLayout.setLayoutParams(relativeParams);

    //IMAGE VIEW
    ImageView selectedPhoto = new ImageView(this);
    selectedPhoto.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
    selectedPhoto.setImageResource(R.drawable.ic_launcher);

    //TEXT VIEWS
    TextView numberCopies = new TextView(this);
    numberCopies.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
    numberCopies.setGravity(Gravity.CENTER);
    numberCopies.setPadding(25, 25, 25, 25);
    numberCopies.setTextColor(getResources().getColor(R.color.blackColor));
    numberCopies.setText("2 copies ");
    RelativeLayout.LayoutParams layoutParamsNumberCopies = (RelativeLayout.LayoutParams) numberCopies.getLayoutParams();
    layoutParamsNumberCopies.addRule(RelativeLayout.CENTER_HORIZONTAL);
    numberCopies.setLayoutParams(layoutParamsNumberCopies);

    TextView priceCopies = new TextView(this);
    priceCopies.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
    priceCopies.setGravity(Gravity.CENTER);
    numberCopies.setPadding(25, 25, 25, 25);
    priceCopies.setTextColor(getResources().getColor(R.color.redColor));
    priceCopies.setText("$ 25 ");
    RelativeLayout.LayoutParams layoutParamsPriceCopies = (RelativeLayout.LayoutParams) priceCopies.getLayoutParams();
    layoutParamsPriceCopies.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
    priceCopies.setLayoutParams(layoutParamsPriceCopies);

    relativeLayout.addView(selectedPhoto);
    relativeLayout.addView(numberCopies);
    relativeLayout.addView(priceCopies);
    linearLayout.addView(relativeLayout);
}
scrollView.addView(linearLayout);
setContentView(scrollView);

我认为失败的块代码是这样的：

//CODE FOR ADD MARGINS
RelativeLayout.LayoutParams relativeParams = (RelativeLayout.LayoutParams)relativeLayout.getLayoutParams();
relativeParams.topMargin=80;
relativeLayout.setLayoutParams(relativeParams);
4

4 回答 4

62

得到解决方案。

当你在RelativeLayout里面使用时LinearLayout，你需要使用LinearLayout.LayoutParams而不是RelativeLayout.LayoutParams。

所以替换你的以下代码......

RelativeLayout.LayoutParams relativeParams = (RelativeLayout.LayoutParams)relativeLayout.getLayoutParams();
relativeParams.setMargins(0, 80, 0, 0);  // left, top, right, bottom
relativeLayout.setLayoutParams(relativeParams);

和...

// CODE FOR ADD MARGINS
LinearLayout.LayoutParams linearParams = new LinearLayout.LayoutParams(
        new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
linearParams.setMargins(0, 80, 0, 0);
relativeLayout.setLayoutParams(linearParams);
relativeLayout.requestLayout();
于 2013-09-17T08:12:28.347 回答
11

您可以使用 setMargins (int left, int top, int right, int bottom)。

试试这样。。

//CODE FOR ADD MARGINS
    RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
    relativeParams.setMargins(0, 80, 0, 0);
    relativeLayout.setLayoutParams(relativeParams);

布局参数应该分别设置为 parentLayout .. 在这种情况下，它LinearLayout由@ChintanRathod 正确指出，所以

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);

会成功的..

于 2013-09-17T08:09:31.917 回答
4

请注意，您在线性布局中使用相对布局，因此您应该使用LinearLayout.LayoutParams

我会替换这个：

        //RELATIVE LAYOUT
        RelativeLayout relativeLayout = new RelativeLayout(this);
        relativeLayout.setLayoutParams(new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,
                RelativeLayout.LayoutParams.FILL_PARENT));
        relativeLayout.setBackgroundColor(getResources().getColor(R.color.grayColor));

        //CODE FOR ADD MARGINS
        RelativeLayout.LayoutParams relativeParams = (RelativeLayout.LayoutParams)relativeLayout.getLayoutParams();
        relativeParams.topMargin=80;
        relativeLayout.setLayoutParams(relativeParams);

这样 ：

        //RELATIVE LAYOUT WITH PROPER LAYOUT PARAMS TO ADD MARGINS
        RelativeLayout relativeLayout = new RelativeLayout(this);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        params.setMargins(0, 80, 0, 0);
        relativeLayout.setLayoutParams(params);
        relativeLayout.setBackgroundColor(getResources().getColor(R.color.grayColor));

另请注意，您应该WRAP_CONTENT在垂直线性布局中用作子级的高度配置。（在FILL_PARENT或MATCH_PARENT模式下，它将填充父母而不为其他孩子留下空间）

于 2013-09-17T08:47:23.577 回答
2

// 科特林

val relativeParams = relativeLayoutGeneral.layoutParams as FrameLayout.LayoutParams                   
relativeParams.setMargins(0, 7, 0, 111)
relativeLayoutGeneral.layoutParams = relativeParams
于 2020-03-25T20:56:47.013 回答