DrawLayout的全屏滑动并取消页面长按效果

使用反射实现：

/**
     * 设置DrawerLayout全屏滑动，参数为1的时候
     *
     * @param activity               当前activity
     * @param drawerLayout           抽屉
     * @param displayWidthPercentage 滑动弹出侧滑栏的范围，0-1
     */
    private void setDrawerLeftEdgeSize(Activity activity, DrawerLayout drawerLayout,
                                       float displayWidthPercentage) {
        if (activity == null || drawerLayout == null) return;
        try {
            // 找到 ViewDragHelper 并设置 Accessible 为true
            Field leftDraggerField =
                    drawerLayout.getClass().getDeclaredField("mLeftDragger");//Right
            leftDraggerField.setAccessible(true);
            ViewDragHelper leftDragger = (ViewDragHelper) leftDraggerField.get(drawerLayout);

            // 找到 edgeSizeField 并设置 Accessible 为true
            Field edgeSizeField = leftDragger.getClass().getDeclaredField("mEdgeSize");
            edgeSizeField.setAccessible(true);
            int edgeSize = edgeSizeField.getInt(leftDragger);

            // 设置新的边缘大小
            Point displaySize = new Point();
            activity.getWindowManager().getDefaultDisplay().getSize(displaySize);
            edgeSizeField.setInt(leftDragger, Math.max(edgeSize, (int) (displaySize.x *
                    displayWidthPercentage)));

            //获取 Layout 的 ViewDragCallBack 实例“mLeftCallback”
            //更改其属性 mPeekRunnable
            Field leftCallbackField = drawerLayout.getClass().getDeclaredField("mLeftCallback");
            leftCallbackField.setAccessible(true);

            //因为无法直接访问私有内部类，所以该私有内部类实现的接口非常重要，通过多态的方式获取实例
            ViewDragHelper.Callback leftCallback = (ViewDragHelper.Callback) leftCallbackField.get(drawerLayout);
            Field peekRunnableField = leftCallback.getClass().getDeclaredField("mPeekRunnable");
            peekRunnableField.setAccessible(true);
            peekRunnableField.set(leftCallback, (Runnable) () -> {
            });
        } catch (NoSuchFieldException ignored) {
        } catch (IllegalArgumentException ignored) {
        } catch (IllegalAccessException ignored) {
        }
    }

然后在onCreate（）方法中调用即可：

 setDrawerLeftEdgeSize(HomeActivity.this, drawer, 1f); // 设置全屏滑动侧滑栏出现

转自：https://febers.github.io/%E5%88%A9%E7%94%A8%E5%8F%8D%E5%B0%84%E5%AE%9E%E7%8E%B0-DrawerLayout-%E5%85%A8%E5%B1%8F%E6%BB%91%E5%8A%A8/