android 4.4以上实现沉浸式状态栏

 /**
     * 适配沉浸式状态栏,sdk 19 以上才有效
     * <br>对全屏状态做了例外处理，全屏状态改变时需要调用此方法
     */
    @TargetApi(android.os.Build.VERSION_CODES.KITKAT)
    public static void immersive(ActionBarActivity activity) {

        if (Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.KITKAT)
            return;

        ColorDrawable bgColor = new ColorDrawable(activity.getResources().getColor(R.color.blue));
        activity.getSupportActionBar().setBackgroundDrawable(bgColor);
        Window window = activity.getWindow();
        int flags = window.getAttributes().flags;
        //非全屏
        if ((flags | WindowManager.LayoutParams.FLAG_FULLSCREEN) != flags) {

            window.setFlags(
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,
                    WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);

            View contentView = window
                    .findViewById(Window.ID_ANDROID_CONTENT);
            contentView.setBackground(bgColor);
            contentView.setPadding(0, getStatusbarHeight(activity), 0, 0);
        } else {
            //全屏
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
            View contentView = window
                    .findViewById(Window.ID_ANDROID_CONTENT);
            contentView.setBackground(bgColor);
            contentView.setPadding(0, 0, 0, 0);
        }
    }

    public static int getStatusbarHeight(Context context) {

        try {
            Class<?> c = Class.forName("com.android.internal.R$dimen");
            Object obj = c.newInstance();
            Field field = c.getField("status_bar_height");
            int x = Integer.parseInt(field.get(obj).toString());
            int y = context.getResources().getDimensionPixelSize(x);
            return y;
        } catch (Exception e) {
            e.printStackTrace();
            return (int) (context.getResources().getDisplayMetrics().density * 20 + 0.5);
        }
    }