您可以几乎在到达 Activity 后模拟关闭抽屉，方法是在 Intent 中传递一个值来告诉新 Activity 打开它的抽屉，而不使用来自 onCreate() 的动画，然后对其进行动画处理在活动布局完成后关闭，但在我的实验中，活动转换破坏了模拟的效果。
另一种方法是避免抽屉动画，只调用startActivity()而不调用closeDrawer()。 Activity 的过渡动画效果还是不错的，而且是立即发生的，不需要等抽屉关闭动画先完成，没有断断续续的感觉，没有长时间的感知延迟。
但是，当使用返回按钮导航回原始活动时，您需要一种方法来关闭抽屉而不使用动画。
详情
（如果你只是想看代码，可以跳过这个解释。）
要完成这项工作，您需要一种在使用后退按钮导航回活动时关闭抽屉而没有任何关闭动画的方法。 （不调用closeDrawer() 将使该活动实例中的抽屉保持打开状态；一个相对浪费的解决方法是在导航返回时将活动强制为recreate()，但不这样做也可以解决这个问题。）您还需要确保仅在导航后返回而不是在方向更改后才关闭抽屉，但这很容易。
虽然从onCreate() 调用closeDrawer() 会使抽屉在没有任何动画的情况下开始关闭，但从onResume() 中却不是这样。从onResume() 调用closeDrawer() 将关闭抽屉，并带有用户暂时可见的动画。 DrawerLayout 没有提供任何方法来关闭没有该动画的抽屉，但添加一个并不难。
关闭抽屉实际上只是将其滑离屏幕。因此，您可以通过将抽屉直接移动到其“关闭”位置来有效地跳过动画。平移方向会根据重力而变化（无论是左抽屉还是右抽屉），而确切的位置取决于抽屉与所有子项一起布局后的大小。
然而，仅仅移动它是不够的，因为DrawerLayout 在扩展的LayoutParams 中保留了一些内部状态，它用于知道抽屉是否打开。如果您只是将抽屉移出屏幕，它不会知道它已关闭，这会导致其他问题。 （例如，抽屉将在下一次方向更改时重新出现。）
由于您将支持库编译到您的应用程序中，您可以在 android.support.v4.widget 包中创建一个类以访问其默认（包私有）部分，或扩展 DrawerLayout 而无需复制任何它需要的其他类。这也将减少未来对支持库的更改来更新代码的负担。 （始终最好将您的代码与实现细节尽可能隔离。）您可以使用moveDrawerToOffset() 移动抽屉，并设置LayoutParams 以便它知道抽屉已关闭。
代码
这是跳过动画的代码：
// move drawer directly to the closed position
moveDrawerToOffset(drawerView, 0.f);
/* EDIT: as of v23.2.1 this direct approach no longer works
because the LayoutParam fields have been made private...
// set internal state so DrawerLayout knows it's closed
final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams();
lp.onScreen = 0.f;
lp.knownOpen = false;
invalidate();
/*/
// ...however, calling closeDrawer will set those LayoutParams
// and invalidate the view.
closeDrawer(drawerView);
/**/
注意：如果您只是调用moveDrawerToOffset() 而不更改LayoutParams，则抽屉将在下一次方向更改时移回其打开位置。
选项 1（使用现有的 DrawerLayout）
这种方法在 support.v4 包中添加了一个实用程序类，以访问我们在 DrawerLayout 中需要的包私有部分。
把这个类放到/src/android/support/v4/widget/:
package android.support.v4.widget;
import android.support.annotation.IntDef;
import android.support.v4.view.GravityCompat;
import android.view.Gravity;
import android.view.View;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
public class Support4Widget {
/** @hide */
@IntDef({Gravity.LEFT, Gravity.RIGHT, GravityCompat.START, GravityCompat.END})
@Retention(RetentionPolicy.SOURCE)
private @interface EdgeGravity {}
public static void setDrawerClosed(DrawerLayout drawerLayout, @EdgeGravity int gravity) {
final View drawerView = drawerLayout.findDrawerWithGravity(gravity);
if (drawerView == null) {
throw new IllegalArgumentException("No drawer view found with gravity " +
DrawerLayout.gravityToString(gravity));
}
// move drawer directly to the closed position
drawerLayout.moveDrawerToOffset(drawerView, 0.f);
/* EDIT: as of v23.2.1 this no longer works because the
LayoutParam fields have been made private, but
calling closeDrawer will achieve the same result.
// set internal state so DrawerLayout knows it's closed
final DrawerLayout.LayoutParams lp = (DrawerLayout.LayoutParams) drawerView.getLayoutParams();
lp.onScreen = 0.f;
lp.knownOpen = false;
drawerLayout.invalidate();
/*/
// Calling closeDrawer updates the internal state so DrawerLayout knows it's closed
// and invalidates the view for us.
drawerLayout.closeDrawer(drawerView);
/**/
}
}
当您离开时在您的活动中设置一个布尔值，指示抽屉应该关闭：
public static final String CLOSE_NAV_DRAWER = "CLOSE_NAV_DRAWER";
private boolean mCloseNavDrawer;
@Override
public void onCreate(Bundle savedInstanceState) {
// ...
if (savedInstanceState != null) {
mCloseNavDrawer = savedInstanceState.getBoolean(CLOSE_NAV_DRAWER);
}
}
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
// ...
startActivity(intent);
mCloseNavDrawer = true;
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
savedInstanceState.putBoolean(CLOSE_NAV_DRAWER, mCloseNavDrawer);
super.onSaveInstanceState(savedInstanceState);
}
...并使用setDrawerClosed() 方法在没有动画的情况下关闭onResume() 中的抽屉：
@Overrid6e
protected void onResume() {
super.onResume();
if(mCloseNavDrawer && mDrawerLayout != null && mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
Support4Widget.setDrawerClosed(mDrawerLayout, GravityCompat.START);
mCloseNavDrawer = false;
}
}
选项 2（从 DrawerLayout 扩展）
这种方法扩展了 DrawerLayout 以添加一个 setDrawerClosed() 方法。
把这个类放到/src/android/support/v4/widget/:
package android.support.v4.widget;
import android.content.Context;
import android.support.annotation.IntDef;
import android.support.v4.view.GravityCompat;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
public class CustomDrawerLayout extends DrawerLayout {
/** @hide */
@IntDef({Gravity.LEFT, Gravity.RIGHT, GravityCompat.START, GravityCompat.END})
@Retention(RetentionPolicy.SOURCE)
private @interface EdgeGravity {}
public CustomDrawerLayout(Context context) {
super(context);
}
public CustomDrawerLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomDrawerLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void setDrawerClosed(View drawerView) {
if (!isDrawerView(drawerView)) {
throw new IllegalArgumentException("View " + drawerView + " is not a sliding drawer");
}
// move drawer directly to the closed position
moveDrawerToOffset(drawerView, 0.f);
/* EDIT: as of v23.2.1 this no longer works because the
LayoutParam fields have been made private, but
calling closeDrawer will achieve the same result.
// set internal state so DrawerLayout knows it's closed
final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams();
lp.onScreen = 0.f;
lp.knownOpen = false;
invalidate();
/*/
// Calling closeDrawer updates the internal state so DrawerLayout knows it's closed
// and invalidates the view for us.
closeDrawer(drawerView);
/**/
}
public void setDrawerClosed(@EdgeGravity int gravity) {
final View drawerView = findDrawerWithGravity(gravity);
if (drawerView == null) {
throw new IllegalArgumentException("No drawer view found with gravity " +
gravityToString(gravity));
}
// move drawer directly to the closed position
moveDrawerToOffset(drawerView, 0.f);
/* EDIT: as of v23.2.1 this no longer works because the
LayoutParam fields have been made private, but
calling closeDrawer will achieve the same result.
// set internal state so DrawerLayout knows it's closed
final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams();
lp.onScreen = 0.f;
lp.knownOpen = false;
invalidate();
/*/
// Calling closeDrawer updates the internal state so DrawerLayout knows it's closed
// and invalidates the view for us.
closeDrawer(drawerView);
/**/
}
}
在您的活动布局中使用CustomDrawerLayout 而不是DrawerLayout：
<android.support.v4.widget.CustomDrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
>
...并在您离开时在您的活动中设置一个布尔值，指示抽屉应该关闭：
public static final String CLOSE_NAV_DRAWER = "CLOSE_NAV_DRAWER";
private boolean mCloseNavDrawer;
@Override
public void onCreate(Bundle savedInstanceState) {
// ...
if (savedInstanceState != null) {
mCloseNavDrawer = savedInstanceState.getBoolean(CLOSE_NAV_DRAWER);
}
}
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
// ...
startActivity(intent);
mCloseNavDrawer = true;
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
savedInstanceState.putBoolean(CLOSE_NAV_DRAWER, mCloseNavDrawer);
super.onSaveInstanceState(savedInstanceState);
}
...并使用setDrawerClosed() 方法在没有动画的情况下关闭onResume() 中的抽屉：
@Overrid6e
protected void onResume() {
super.onResume();
if(mCloseNavDrawer && mDrawerLayout != null && mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
mDrawerLayout.setDrawerClosed(GravityCompat.START);
mCloseNavDrawer = false;
}
}