Android(安卓)Theme

这里如果将ColorPrimary和colorPrimaryDark颜色值设置成一致，那么将会成为“沉浸式”，或者说是透明状态栏

注意：他们android不同版本上实现方法不同

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 /** * 设置状态栏颜色 * * @param activity       需要设置的activity * @param color          状态栏颜色值 * @param statusBarAlpha 状态栏透明度 */public static void setColor(Activity activity, @ColorInt int color, int statusBarAlpha) {    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {        activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);        activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);        activity.getWindow().setStatusBarColor(calculateStatusColor(color, statusBarAlpha));    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {      //版本是大于19，设置背景为透明        activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);        ViewGroup decorView = (ViewGroup) activity.getWindow().getDecorView();        int count = decorView.getChildCount();        if (count > 0 && decorView.getChildAt(count - 1) instanceof StatusBarView) {            decorView.getChildAt(count - 1).setBackgroundColor(calculateStatusColor(color, statusBarAlpha));        } else {            StatusBarView statusView = createStatusBarView(activity, color, statusBarAlpha);            decorView.addView(statusView);        }        setRootView(activity);    }} /** * 计算状态栏颜色 * * @param color color值 * @param alpha alpha值 * @return 最终的状态栏颜色 */private static int calculateStatusColor(@ColorInt int color, int alpha) {    float a = 1 - alpha / 255f;    int red = color >> 16 & 0xff;    int green = color >> 8 & 0xff;    int blue = color & 0xff;    red = (int) (red * a + 0.5);    green = (int) (green * a + 0.5);    blue = (int) (blue * a + 0.5);    return 0xff << 24 | red << 16 | green << 8 | blue;}

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