如何根据屏幕尺寸更改按钮尺寸？

Question

I have an image button. What is the way to change its size according to the screen size?

<Button
    android:id="@+id/infobutton"
    android:layout_width="64dp"
    android:layout_height="64dp"
    android:layout_alignLeft="@+id/button1"
    android:layout_centerVertical="true"
    android:layout_marginLeft="45dp"
    android:background="@drawable/info_button" />

Answer 1

This answer is a bit involved, so bear with me.

You can create some methods like so..

public static int getScreenDensity(Context context) {
    int density = context.getResources().getDisplayMetrics().densityDpi;

    switch(density)
    {
        case DisplayMetrics.DENSITY_LOW:
            return DisplayMetrics.DENSITY_LOW;

        case DisplayMetrics.DENSITY_MEDIUM:
            return DisplayMetrics.DENSITY_MEDIUM;

        case DisplayMetrics.DENSITY_HIGH:
            return DisplayMetrics.DENSITY_HIGH;

        case DisplayMetrics.DENSITY_XHIGH:
            return DisplayMetrics.DENSITY_XHIGH;

        case DisplayMetrics.DENSITY_XXHIGH:
            return DisplayMetrics.DENSITY_XXHIGH;

        case DisplayMetrics.DENSITY_XXXHIGH:
            return DisplayMetrics.DENSITY_XXXHIGH;

        default:
            return DisplayMetrics.DENSITY_DEFAULT;
    }
}

Then in an activity you can detect the screen size and adjust button's properties like so.

private void setTunerPopoverSize( PopoverView popoverView ) {
    int screenDensity = Util.getScreenDensity( this );

    if (screenDensity == DisplayMetrics.DENSITY_HIGH) {
        // set button size here if high density
    }  else if (screenDensity == DisplayMetrics.DENSITY_XHIGH) {
        // set button size here if xhigh density
    } else {
        // set default button size
    }
}

I hope this helps.