如何在 Android 中以編程方式更改按鈕大小？

Question

我正在創建按鈕並以編程方式將它們添加到 LinearLayout。 但是，我正在努力更改按鈕大小。 在下面的代碼中，無論我在 deleteBtn.setWidth(num) 和 deleteBtn.setHeight(num) 中輸入什么 num，都沒有任何變化。

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);
    }
}

我應該寫什么才能改變按鈕大小？

Answer 1

您應該應用包含您的Button的LinearLayout LayoutParams 。

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

Answer 2

試試這個

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

Answer 3

請嘗試以下操作：

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;
    }

Answer 4

您可以使用 LayoutParams 設置寬度和高度，通常當我使用作為參考屏幕尺寸的尺寸進行管理時。 我經常做這樣的事情：

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);

Answer 5

如果您只想更改高度並保持寬度不變，

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

並且只改變寬度，

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

Answer 6

搜索要在 Tablerow [tbrow] 中顯示的按鈕 [del] 的答案，只會導致為出現該按鈕的 Tablerow 設置參數。

            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);