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/**
 * 用于获取状态栏的高度。
 *
 * @return 返回状态栏高度的像素值。
 */
private int getStatusBarHeight() {
	if (statusBarHeight == 0) {
		try {
			Class<?> c = Class.forName("com.android.internal.R$dimen");
			Object o = c.newInstance();
			Field field = c.getField("status_bar_height");
			int x = (Integer) field.get(o);
			statusBarHeight = getResources().getDimensionPixelSize(x);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	return statusBarHeight;
}