还有一种方法可以通过利用DrawerArrowDrawable 中现有的颜色方法以编程方式进行。您只需将自己的DrawerArrowDrawable 传递给ActionBarDrawerToggle 并保留对DrawerArrowDrawable 的引用，以便调用其方法。
但是，ActionBarDrawerToggle 中的构造函数当前具有包私有访问权限，因此您需要在 android.support.v7.app 包中添加一个类才能访问它。
这是一种从ActionBarDrawerToggle 扩展来公开颜色方法的方法。
把这个类放到/src/android/support/v7/app/:
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.support.v7.app;
import android.app.ActionBar;
import android.app.Activity;
import android.content.Context;
import android.graphics.ColorFilter;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.annotation.ColorInt;
import android.support.annotation.StringRes;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.graphics.drawable.DrawerArrowDrawable;
import android.support.v7.widget.Toolbar;
import android.util.Log;
/*
* Version of ActionBarDrawerToggle that exposes DrawerArrowDrawable's color methods.
* Needs to be in android.support.v7.app in order to access a constructor in ActionBarDrawerToggle
* which currently has package-private access.
*/
public class ColorableActionBarDrawerToggle extends ActionBarDrawerToggle {
private final DrawerArrowDrawable mSlider;
/**
* Construct a new ColorableActionBarDrawerToggle.
*
* <p>The given {@link Activity} will be linked to the specified {@link DrawerLayout} and
* its Actionbar's Up button will be set to a custom drawable.
* <p>This drawable shows a Hamburger icon when drawer is closed and an arrow when drawer
* is open. It animates between these two states as the drawer opens.</p>
*
* <p>String resources must be provided to describe the open/close drawer actions for
* accessibility services.</p>
*
* @param activity The Activity hosting the drawer. Should have an ActionBar.
* @param drawerLayout The DrawerLayout to link to the given Activity's ActionBar
* @param openDrawerContentDescRes A String resource to describe the "open drawer" action
* for accessibility
* @param closeDrawerContentDescRes A String resource to describe the "close drawer" action
* for accessibility
*/
public ColorableActionBarDrawerToggle( Activity activity
, DrawerLayout drawerLayout
, @StringRes int openDrawerContentDescRes
, @StringRes int closeDrawerContentDescRes ) {
this(activity, null, drawerLayout, null, openDrawerContentDescRes, closeDrawerContentDescRes);
}
/**
* Construct a new ColorableActionBarDrawerToggle with a Toolbar.
* <p>
* The given {@link Activity} will be linked to the specified {@link DrawerLayout} and
* the Toolbar's navigation icon will be set to a custom drawable. Using this constructor
* will set Toolbar's navigation click listener to toggle the drawer when it is clicked.
* <p>
* This drawable shows a Hamburger icon when drawer is closed and an arrow when drawer
* is open. It animates between these two states as the drawer opens.
* <p>
* String resources must be provided to describe the open/close drawer actions for
* accessibility services.
* <p>
* Please use {@link #ActionBarDrawerToggle(Activity, DrawerLayout, int, int)} if you are
* setting the Toolbar as the ActionBar of your activity.
*
* @param activity The Activity hosting the drawer.
* @param toolbar The toolbar to use if you have an independent Toolbar.
* @param drawerLayout The DrawerLayout to link to the given Activity's ActionBar
* @param openDrawerContentDescRes A String resource to describe the "open drawer" action
* for accessibility
* @param closeDrawerContentDescRes A String resource to describe the "close drawer" action
* for accessibility
*/
public ColorableActionBarDrawerToggle( Activity activity
, DrawerLayout drawerLayout
, Toolbar toolbar
, @StringRes int openDrawerContentDescRes
, @StringRes int closeDrawerContentDescRes ) {
this(activity, toolbar, drawerLayout, null, openDrawerContentDescRes, closeDrawerContentDescRes);
}
/**
* In the future, [Google] can make this constructor public if [they] want to let developers customize
* the animation.
*
* [If they make this constructor public, ColorableActionBarDrawerToggle could be in another package.]
*/
<T extends DrawerArrowDrawable & DrawerToggle>
ColorableActionBarDrawerToggle( Activity activity
, Toolbar toolbar
, DrawerLayout drawerLayout
, T slider
, @StringRes int openDrawerContentDescRes
, @StringRes int closeDrawerContentDescRes ) {
super( activity
, toolbar
, drawerLayout
, (slider == null) ? slider = (T)new DrawerArrowDrawableToggle(activity, getActionBarThemedContext(activity, toolbar))
: slider
, openDrawerContentDescRes
, closeDrawerContentDescRes );
mSlider = slider;
}
/*
* Condensed (equivalent) version of the code in all the getActionBarThemedContext methods
* called by ActionBarDrawerToggle constructor as of 23.1.
*/
private static Context getActionBarThemedContext(Activity activity, Toolbar toolbar) {
Context context = null;
if (toolbar != null) {
context = toolbar.getContext();
} else if (activity instanceof DelegateProvider) { // Allow the Activity to provide an impl
final Delegate delegate = ((DelegateProvider) activity).getDrawerToggleDelegate();
context = delegate.getActionBarThemedContext();
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
final ActionBar actionBar = activity.getActionBar();
if (actionBar != null) {
context = actionBar.getThemedContext();
} else {
context = activity;
}
}
return context;
}
/// Expose DrawerArrowDrawable's color methods
public void setColorFilter(ColorFilter colorFilter) {
if(mSlider != null) {
mSlider.setColorFilter(colorFilter);
}
}
public void setColor(@ColorInt int color) {
if(mSlider != null) {
mSlider.setColor(color);
}
}
@ColorInt
public int getColor() {
if(mSlider != null) {
return mSlider.getColor();
}
return 0;//Color.TRANSPARENT;
}
public void setAlpha(int alpha) {
if(mSlider != null) {
mSlider.setAlpha(alpha);
}
}
}
然后只需使用ColorableActionBarDrawerToggle 代替ActionBarDrawerToggle，并调用其setColor() 或setColorFilter() 方法在运行时更改颜色：
ColorableActionBarDrawerToggle mDrawerToggle;
// ....
mDrawerToggle.setColor(0xffff0000); // make it red