android - 使 UI 元素相对于屏幕尺寸？

Question

比方说我想用左右两列按钮创建一个相对 View 。

每个按钮恰好占据屏幕的 20%，以 10% 分隔，其余边框位于两侧。但是要为任何屏幕尺寸执行此操作。我认为 DP 行不通，因为您如何知道每个不同屏幕上的 DP 像素数？

基本上，您如何在所有设备之间保持 UI 的相对相同和适合？

Answer 1

简答:LinearLayout。

长答案在这里:

Defining a percentage width for a LinearLayout?

也有在运行时获取密度的方法，但从长远来看，上述方法更容易。

准备好一些伪 xml!

<LinearLayout double fill parent, vertical>
    <RelativeLayout w = 0, h = 0, weight smallish>
         <Button A />
    </RelativeLayout>
    <LinearLayout w = 0, h = 0, weight largish. horizontal>
         <!-- maybe you want these to be RelativeLayout and set the buttons
         as centerHorizontalInParent="true" -->
         <LinearLayout w = 0, h = 0, weight whatever 20% is>
              <Buttons with some padding/margins>
         </LinearLayout>
         <Some kind of spacer, or just pad the LLs />
         <LinearLayout repeat above />
     </LL>
</LL>

编辑:

如果您一心想做很多动态调整大小，我有这个自定义类来获取屏幕大小:

public class ScreenGetter {
    private float pixHeight;
    private float pixWidth;
    private float dpHeight;
    private float dpWidth;
    private float density;

public ScreenGetter (Context context){
    Display display = ((WindowManager)
                context.getSystemService(Context.WINDOW_SERVICE))
                .getDefaultDisplay();
    DisplayMetrics metrics = new DisplayMetrics ();
    display.getMetrics(metrics);

    pixHeight = metrics.heightPixels;
    pixWidth = metrics.widthPixels;
    density  = context.getResources().getDisplayMetrics().density;
    dpHeight = pixHeight / density;
    dpWidth  = pixWidth / density;
}

public float getPixHeight(){return pixHeight;}
public float getPixWidth(){return pixWidth;}
public float getDpHeight(){return dpHeight;}
public float getDpWidth(){return dpWidth;}
public float getDensity(){return density;}

}

显然，您需要做一些数学运算才能确定您想要的不同尺寸和密度的产品。您还需要考虑未使用的屏幕部分(ActionBar 等)