屏幕基本元素大小计算

1.获取包含虚拟按键整个屏幕大小

//onCreate里面可以直接使用
private int getScreenSize() {
    int dpi = 0;
    Display display = getWindowManager().getDefaultDisplay();
    DisplayMetrics dm = new DisplayMetrics();
    @SuppressWarnings("rawtypes")
    Class c;
    try {
        c = Class.forName("android.view.Display");
        @SuppressWarnings("unchecked")
        Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);
        method.invoke(display, dm);
        dpi = dm.heightPixels;
    } catch (Exception e) {
        e.printStackTrace();
    }
    Log.i(TAG, "all size " + dpi);
    return dpi;
}

2.获取不包含虚拟按键的屏幕大小

//onCreate里面可以直接使用
private int getScreenSizeWithoutVirtualKey() {
    int height = getWindowManager().getDefaultDisplay().getHeight();
    return height;
}

//另外获取不包含虚拟按键的一个方法
public static int getScreenHeight(Context context)
{
    WindowManager wm = (WindowManager) context
            .getSystemService(Context.WINDOW_SERVICE);
    DisplayMetrics outMetrics = new DisplayMetrics();
    wm.getDefaultDisplay().getMetrics(outMetrics);
    Log.i(TAG, "-------------heigt " + outMetrics.heightPixels);
    return outMetrics.heightPixels;
}

3.获取标题栏的高度

//不能再onCreate里面直接使用,和普通view一样mesure才可以获取高度
public static int getTitleHeight(Activity activity){
    int height = activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();
    Log.i(TAG, "title height " + height);
    return height;
}

4.获取状态栏高度

//onCreate里面可以直接使用
public static int getStatusHeight(Context context)
{
    int statusHeight = -1;
    try
    {
        Class<?> clazz = Class.forName("com.android.internal.R$dimen");
        Object object = clazz.newInstance();
        int height = Integer.parseInt(clazz.getField("status_bar_height")
                .get(object).toString());
        statusHeight = context.getResources().getDimensionPixelSize(height);
    } catch (Exception e)
    {
        e.printStackTrace();
    }
    return statusHeight;
}