如何在 Android 中以编程方式更改按钮大小？

Posted 2023-02-26

【中文标题】如何在 Android 中以编程方式更改按钮大小？

【英文标题】：How to change button size programmatically in Android?

【发布时间】：2018-06-28 07:34:49

【问题描述】：

我正在创建按钮并以编程方式将它们添加到 LinearLayout。但是，我正在努力更改按钮大小。在下面的代码中，无论我在 deleteBtn.setWidth(num) 和 deleteBtn.setHeight(num) 中输入什么 num，都没有任何变化。

private void populateHorizontalLayouts(CustomMessageEvent event) 
    // Need to remove all views each time an user adds a number
    // so that the same number is not rendered multiple times.

    nameAndNumbersLayout.removeAllViews();

    //displayedNamesAndNumbers.add(event.getCustomMessage());
    for(int i =0; i < displayedNamesAndNumbers.size(); i++)
        String displayedNumberAndName = displayedNamesAndNumbers.get(i);

        LinearLayout horizontalLayout = new LinearLayout(view.getContext());
        horizontalLayout.setOrientation(LinearLayout.HORIZONTAL);
        horizontalLayout.setId(i);

        Button deleteBtn = new Button(view.getContext());
        deleteBtn.setId(i);
        deleteBtn.setText("Delete");
        deleteBtn.setWidth(5);
        deleteBtn.setHeight(5);

        TextView nameAndNumView = new TextView(view.getContext());
        nameAndNumView.setId(i);
        nameAndNumView.setText(displayedNumberAndName);

        horizontalLayout.addView(deleteBtn);
        horizontalLayout.addView(nameAndNumView);

        nameAndNumbersLayout.addView(horizontalLayout);
    

我应该写什么来改变按钮大小？

【问题讨论】：

Programmatically change the width of the Button in android的可能重复

【参考方案1】：

您应该应用包含您的Button 的LinearLayout 中的LayoutParams。

deleteBtn.setLayoutParams(new LinearLayout.LayoutParams(5, 5));

【讨论】：

对于 Kotlin 程序员来说，它看起来像这样：deleteBtn.layoutParams = LinearLayout.LayoutParams(5, 5)

【参考方案2】：

试试这个

deleteBtn.setLayoutParams (new LayoutParams(LayoutParams.MATCH_PARENT, 15));

【参考方案3】：

尝试以下方法：

int pixels = Math.round(convertDpToPixel(50, getApplicationContext()));

deleteBtn.setLayoutParams(new LinearLayout.LayoutParams(pixels, pixels));

public static float convertDpToPixel(float dp, Context context)
    Resources resources = context.getResources();
    DisplayMetrics metrics = resources.getDisplayMetrics();
    float px = dp * ((float)metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT);
    return px;
    

【参考方案4】：

您可以使用 LayoutParams 设置宽度和高度，通常当我使用尺寸进行管理时，我将其用作参考屏幕的尺寸。 我经常做这样的事情：

Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;

float targetWidth = width / 3;
float targetHeight = targetWidth * 3;
deleteBtn.setLayoutParams(new LinearLayout.LayoutParams(targetWidth, targetHeight);

【参考方案5】：

如果你只是想改变高度并保持宽度不变，

// This sets the height to 5 *pixels*, with keeping the width as it is.
deleteBtn.setLayoutParams (new LayoutParams(deleteBtn.getLayoutParams().getWidth(), 5));

只改变宽度，

deleteBtn.setLayoutParams (new LayoutParams(5, deleteBtn.getLayoutParams().getHeight()));

【参考方案6】：

搜索要在表格行 [tbrow] 中显示的按钮 [del] 的答案，结果只设置了按钮出现的表格行的参数。

            del = new Button(getApplicationContext());
            del.setText("DELETE");
            del.setTextColor(Color.BLACK);
            del.setGravity(Gravity.END);
            del.setBackgroundColor(Color.parseColor("#FFFFC107"));       
            del.setLayoutParams (new TableRow.LayoutParams(80, 50));
            tbrow.addView(del);