DrawerLayout常见问题

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1.取消DrawerLayout滑出时内容区（Content）域遮罩效果：

如图中Content区域的遮罩半透明效果

源码：

android\support\v4\widget\DrawerLayout.java:

/**
 * Set a color to use for the scrim that obscures primary content while a drawer is open.
 *
 * @param color Color to use in 0xAARRGGBB format.
 */
public void setScrimColor(@ColorInt int color) {
    mScrimColor = color;
    invalidate();
}

解决办法：

将遮罩层颜色设置为透明即可

mDrawerLayout.setScrimColor(Color.TRANSPARENT);

2.取消DrawerLayout滑出时菜单区（Menu）边缘阴影效果：

如图中Menu区域边缘阴影效果

源码：

android\support\v4\widget\DrawerLayout.java:

/**
 * Set a simple drawable used for the left or right shadow. The drawable provided must have a
 * nonzero intrinsic width. For API 21 and above, an elevation will be set on the drawer
 * instead of using the provided shadow drawable.
 *
 * 
Note that for better support for both left-to-right and right-to-left layout
 * directions, a drawable for RTL layout (in additional to the one in LTR layout) can be
 * defined with a resource qualifier "ldrtl" for API 17 and above with the gravity
 * {@link GravityCompat#START}. Alternatively, for API 23 and above, the drawable can
 * auto-mirrored such that the drawable will be mirrored in RTL layout.
 *
 * @param resId Resource id of a shadow drawable to use at the edge of a drawer
 * @param gravity Which drawer the shadow should apply to
 */
public void setDrawerShadow(@DrawableRes int resId, @EdgeGravity int gravity) {
    setDrawerShadow(ContextCompat.getDrawable(getContext(), resId), gravity);
}

解决办法：

自定义一个阴影效果

mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);