用hamburger实现Toolbar
对箭头动画非常容易。在我看来这个动画是没有意义的,因为根据材料设计规格导航抽屉打开时覆盖Toolbar
。我的问题是如何正确禁用此动画,并使用getSupportActionBar().setDisplayHomeAsUpEnabled(true);
显示汉堡包或后退箭头
这就是我做的方式,但它看起来像一个肮脏的黑客:
mDrawerToggle.setDrawerIndicatorEnabled(false);
if (showHomeAsUp) {
mDrawerToggle.setHomeAsUpIndicator(R.drawable.lib_ic_arrow_back_light);
mDrawerToggle.setToolbarNavigationClickListener(view -> finish());
} else {
mDrawerToggle.setHomeAsUpIndicator(R.drawable.lib_ic_menu_light);
mDrawerToggle.setToolbarNavigationClickListener(view -> toggleDrawer());
}
任何线索如何正确实施只使用setDisplayHomeAsUpEnabled
在汉堡包和后箭头图标之间切换?
这将禁用动画,在创建drawerToggle时,覆盖onDrawerSlide():
drawerToggle = new ActionBarDrawerToggle(this, drawerLayout,
getToolbar(), R.string.open, R.string.close) {
@Override
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
}
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
super.onDrawerSlide(drawerView, 0); // this disables the animation
}
};
如果要完全删除箭头,可以添加
super.onDrawerSlide(drawerView, 0); // this disables the arrow @ completed state
在onDrawerOpened函数的末尾。
在我看来这个动画毫无意义
好吧,ActionBarDrawerToggle
意味着动画。
您可以通过在ActionBar主题中定义drawerArrowStyle来自定义动画切换。
任何线索如何正确实现只使用setDisplayHomeAsUpEnabled在汉堡包和后箭头图标之间切换?
ActionBarDrawerToggle
只是一种称为ActionBar.setHomeAsUpIndicator
的奇特方式。因此,无论哪种方式,您都必须将ActionBar.setDisplayHomeAsUpEnabled
调用true
才能显示它。
如果您确信必须使用它,那么我建议分别调用ActionBarDrawerToggle.onDrawerOpened(View drawerView)
和ActionBarDrawerToggle.onDrawerClosed(View drawerView)
。
这将把DrawerIndicator
位置设置为1
或0
,在DrawerArrowDrawable
的箭头和汉堡状态之间切换。
在你的情况下,甚至没有必要附加一个ActionBarDrawerToggle
作为DrawerLayout.DrawerListener
。如:
mYourDrawer.setDrawerListener(mYourDrawerToggle);
但更为前瞻性的方法是将ActionBar.setHomeAsUpIndicator
称为一次并使用自己的汉堡包图标,你也可以通过一种风格来做到这一点。然后,当您想要显示后退箭头时,只需调用ActionBar.setDisplayHomeAsUpEnabled
并让AppCompat或框架处理其余部分。根据您的评论,我很确定这是您正在寻找的。
如果您不确定使用哪个图标,the default DrawerArrowDrawable
size is 24dp
,这意味着您想要从Google官方Material design图标包中的ic_menu_white_24dp
中获取ic_menu_black_24dp
或navigation icon set。
您也可以将DrawerArrowDrawable
复制到您的项目中,然后根据需要切换箭头或汉堡包状态。它是自包含的,减去一些资源。
这是我控制位于NavigationDrawerFragment中的ActionBarDrawableToggle的函数,我在每个片段的onActivityCreated回调中调用它。职能是必要的。汉堡图标变为后箭头,后箭头可点击。处理程序正确处理方向更改。
...
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBarDrawerToggle;
...
public class NavigationDrawerFragment extends Fragment
{
private ActionBarDrawerToggle mDrawerToggle;
...
public void syncDrawerState()
{
new Handler().post(new Runnable()
{
@Override
public void run()
{
final ActionBar actionBar = activity.getSupportActionBar();
if (activity.getSupportFragmentManager().getBackStackEntryCount() > 1 && (actionBar.getDisplayOptions() & ActionBar.DISPLAY_HOME_AS_UP) != ActionBar.DISPLAY_HOME_AS_UP)
{
new Handler().post(new Runnable()
{
@Override
public void run()
{
mDrawerToggle.setDrawerIndicatorEnabled(false);
actionBar.setDisplayHomeAsUpEnabled(true);
mDrawerToggle.setToolbarNavigationClickListener(onToolbarNavigationClickListener());
}
});
} else if (activity.getSupportFragmentManager().getBackStackEntryCount() <= 1 && (actionBar.getDisplayOptions() & ActionBar.DISPLAY_HOME_AS_UP) == ActionBar.DISPLAY_HOME_AS_UP)
{
actionBar.setHomeButtonEnabled(false);
actionBar.setDisplayHomeAsUpEnabled(false);
mDrawerToggle.setDrawerIndicatorEnabled(true);
mDrawerToggle.syncState();
}
}
});
}
}
这只是我基础片段中的onActivityCreated方法。
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
navigationDrawerFragment.syncDrawerState();
}
我有类似的要求,并花了一些时间通过ActionBarDrawerToggle
代码。你现在拥有的是最好的前进方式。
更多内容:
箭头动画的汉堡包由一个可绘制的实现 - DrawerArrowDrawableToggle
提供。目前,我们无法控制这种抽屉对抽屉状态的反应。以下是actionVarDrawerToggle
的包访问构造函数:
/**
* In the future, we can make this constructor public if we want to let developers customize
* the
* animation.
*/
<T extends Drawable & DrawerToggle> ActionBarDrawerToggle(Activity activity, Toolbar toolbar,
DrawerLayout drawerLayout, T slider,
@StringRes int openDrawerContentDescRes,
@StringRes int closeDrawerContentDescRes)
通过提供自己的slider
实现,您可以控制它对抽屉状态的反应。 slider
必须实现的接口:
/**
* Interface for toggle drawables. Can be public in the future
*/
static interface DrawerToggle {
public void setPosition(float position);
public float getPosition();
}
setPosition(float)
是这里的亮点 - 所有抽屉状态更改都要求它更新抽屉指示器。
对于你想要的行为,你的slider
实现的setPosition(float position)
什么也不做。
你仍然需要:
if (showHomeAsUp) {
mDrawerToggle.setDrawerIndicatorEnabled(false);
// Can be set in theme
mDrawerToggle.setHomeAsUpIndicator(R.drawable.lib_ic_arrow_back_light);
mDrawerToggle.setToolbarNavigationClickListener(view -> finish());
}
如果你不setDrawerIndicatorEnabled(false)
,你用OnClickListener
设置的setToolbarNavigationClickListener(view -> finish());
将不会开火。
我们现在能做什么?
经过仔细检查,我发现在ActionBarDrawerToggle
有一项规定。我觉得这个规定比你现在的更糟糕。但是,我会让你决定。
ActionBarDrawerToggle
让您通过界面Delegate控制抽屉指示器。您可以通过以下方式让您的活动实现此接口:
public class TheActivity extends ActionBarActivity implements ActionBarDrawerToggle.Delegate {
....
@Override
public void setActionBarUpIndicator(Drawable drawableNotUsed, int i) {
// First, we're not using the passed drawable, the one that animates
// Second, we check if `displayHomeAsUp` is enabled
final boolean displayHomeAsUpEnabled = (getSupportActionBar().getDisplayOptions()
& ActionBar.DISPLAY_HOME_AS_UP) == ActionBar.DISPLAY_HOME_AS_UP;
// We'll control what happens on navigation-icon click
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (displayHomeAsUpEnabled) {
finish();
} else {
// `ActionBarDrawerToggle#toggle()` is private.
// Extend `ActionBarDrawerToggle` and make provision
// for toggling.
mDrawerToggle.toggleDrawer();
}
}
});
// I will talk about `mToolbarnavigationIcon` later on.
if (displayHomeAsUpEnabled) {
mToolbarNavigationIcon.setIndicator(
CustomDrawerArrowDrawable.HOME_AS_UP_INDICATOR);
} else {
mToolbarNavigationIcon.setIndicator(
CustomDrawerArrowDrawable.DRAWER_INDICATOR);
}
mToolbar.setNavigationIcon(mToolbarNavigationIcon);
mToolbar.setNavigationContentDescription(i);
}
@Override
public void setActionBarDescription(int i) {
mToolbar.setNavigationContentDescription(i);
}
@Override
public Drawable getThemeUpIndicator() {
final TypedArray a = mToolbar.getContext()
.obtainStyledAttributes(new int[]{android.R.attr.homeAsUpIndicator});
final Drawable result = a.getDrawable(0);
a.recycle();
return result;
}
@Override
public Context getActionBarThemedContext() {
return mToolbar.getContext();
}
....
}
ActionBarDrawerToggle
将使用此处提供的setActionBarUpIndicator(Drawable, int)
。因为,我们忽略了传递的Drawable
,我们可以完全控制将要显示的内容。
Catch:如果我们将ActionBarDrawerToggle
参数传递为null,Activity
将让我们的Toolbar
充当委托:
public ActionBarDrawerToggle(Activity activity, DrawerLayout drawerLayout,
Toolbar toolbar, @StringRes int openDrawerContentDescRes,
@StringRes int closeDrawerContentDescRes) { .... }
而且,您需要在活动中覆盖getV7DrawerToggleDelegate()
:
@Nullable
@Override
public ActionBarDrawerToggle.Delegate getV7DrawerToggleDelegate() {
return this;
}
正如你所看到的,正确的方法是做很多额外的工作。我们还没有完成。
动画DrawerArrowDrawableToggle
可以使用these attributes风格。如果您希望您的可绘制状态(homeAsUp和汉堡包)与默认状态完全相同,则需要按以下方式实现:
/**
* A drawable that can draw a "Drawer hamburger" menu or an Arrow
*/
public class CustomDrawerArrowDrawable extends Drawable {
public static final float DRAWER_INDICATOR = 0f;
public static final float HOME_AS_UP_INDICATOR = 1f;
private final Activity mActivity;
private final Paint mPaint = new Paint();
// The angle in degress that the arrow head is inclined at.
private static final float ARROW_HEAD_ANGLE = (float) Math.toRadians(45);
private final float mBarThickness;
// The length of top and bottom bars when they merge into an arrow
private final float mTopBottomArrowSize;
// The length of middle bar
private final float mBarSize;
// The length of the middle bar when arrow is shaped
private final float mMiddleArrowSize;
// The space between bars when they are parallel
private final float mBarGap;
// Use Path instead of canvas operations so that if color has transparency, overlapping sections
// wont look different
private final Path mPath = new Path();
// The reported intrinsic size of the drawable.
private final int mSize;
private float mIndicator;
/**
* @param context used to get the configuration for the drawable from
*/
public CustomDrawerArrowDrawable(Activity activity, Context context) {
final TypedArray typedArray = context.getTheme()
.obtainStyledAttributes(null, R.styleable.DrawerArrowToggle,
R.attr.drawerArrowStyle,
R.style.Base_Widget_AppCompat_DrawerArrowToggle);
mPaint.setAntiAlias(true);
mPaint.setColor(typedArray.getColor(R.styleable.DrawerArrowToggle_color, 0));
mSize = typedArray.getDimensionPixelSize(R.styleable.DrawerArrowToggle_drawableSize, 0);
mBarSize = typedArray.getDimension(R.styleable.DrawerArrowToggle_barSize, 0);
mTopBottomArrowSize = typedArray
.getDimension(R.styleable.DrawerArrowToggle_topBottomBarArrowSize, 0);
mBarThickness = typedArray.getDimension(R.styleable.DrawerArrowToggle_thickness, 0);
mBarGap = typedArray.getDimension(R.styleable.DrawerArrowToggle_gapBetweenBars, 0);
mMiddleArrowSize = typedArray
.getDimension(R.styleable.DrawerArrowToggle_middleBarArrowSize, 0);
typedArray.recycle();
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.SQUARE);
mPaint.setStrokeWidth(mBarThickness);
mActivity = activity;
}
public boolean isLayoutRtl() {
return ViewCompat.getLayoutDirection(mActivity.getWindow().getDecorView())
== ViewCompat.LAYOUT_DIRECTION_RTL;
}
@Override
public void draw(Canvas canvas) {
Rect bounds = getBounds();
final boolean isRtl = isLayoutRtl();
// Interpolated widths of arrow bars
final float arrowSize = lerp(mBarSize, mTopBottomArrowSize, mIndicator);
final float middleBarSize = lerp(mBarSize, mMiddleArrowSize, mIndicator);
// Interpolated size of middle bar
final float middleBarCut = lerp(0, mBarThickness / 2, mIndicator);
// The rotation of the top and bottom bars (that make the arrow head)
final float rotation = lerp(0, ARROW_HEAD_ANGLE, mIndicator);
final float topBottomBarOffset = lerp(mBarGap + mBarThickness, 0, mIndicator);
mPath.rewind();
final float arrowEdge = -middleBarSize / 2;
// draw middle bar
mPath.moveTo(arrowEdge + middleBarCut, 0);
mPath.rLineTo(middleBarSize - middleBarCut, 0);
final float arrowWidth = Math.round(arrowSize * Math.cos(rotation));
final float arrowHeight = Math.round(arrowSize * Math.sin(rotation));
// top bar
mPath.moveTo(arrowEdge, topBottomBarOffset);
mPath.rLineTo(arrowWidth, arrowHeight);
// bottom bar
mPath.moveTo(arrowEdge, -topBottomBarOffset);
mPath.rLineTo(arrowWidth, -arrowHeight);
mPath.moveTo(0, 0);
mPath.close();
canvas.save();
if (isRtl) {
canvas.rotate(180, bounds.centerX(), bounds.centerY());
}
canvas.translate(bounds.centerX(), bounds.centerY());
canvas.drawPath(mPath, mPaint);
canvas.restore();
}
@Override
public void setAlpha(int i) {
mPaint.setAlpha(i);
}
// override
public boolean isAutoMirrored() {
// Draws rotated 180 degrees in RTL mode.
return true;
}
@Override
public void setColorFilter(ColorFilter colorFilter) {
mPaint.setColorFilter(colorFilter);
}
@Override
public int getIntrinsicHeight() {
return mSize;
}
@Override
public int getIntrinsicWidth() {
return mSize;
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
public void setIndicator(float indicator) {
mIndicator = indicator;
invalidateSelf();
}
/**
* Linear interpolate between a and b with parameter t.
*/
private static float lerp(float a, float b, float indicator) {
if (indicator == HOME_AS_UP_INDICATOR) {
return b;
} else {
return a;
}
}
}
CustomDrawerArrowDrawable's
的实施是从AOSP借来的,并且被剥离以允许只绘制两个州:homeAsUp和汉堡。您可以通过调用setIndicator(float)
在这些状态之间切换。我们在我们实施的Delegate
中使用它。此外,使用CustomDrawerArrowDrawable
将允许您在xml中设置样式:barSize
,color
等。即使您不需要它,上面的实现也允许您为抽屉打开和关闭提供自定义动画。
老实说,我不知道是否应该推荐这个。
如果你用ActionBarDrawerToggle#setHomeAsUpIndicator(...)
参数调用null
,它应该选择你主题中定义的drawable:
<item name="android:homeAsUpIndicator">@drawable/some_back_drawable</item>
目前,由于ToolbarCompatDelegate#getThemeUpIndicator()
可能存在错误,因此不会发生这种情况:
@Override
public Drawable getThemeUpIndicator() {
final TypedArray a = mToolbar.getContext()
// Should be new int[]{android.R.attr.homeAsUpIndicator}
.obtainStyledAttributes(new int[]{android.R.id.home});
final Drawable result = a.getDrawable(0);
a.recycle();
return result;
}
Bug报告松散地讨论了这个问题(阅读案例4):Link
如果您决定坚持使用已有的解决方案,请考虑使用CustomDrawerArrowDrawable
代替pngs(R.drawable.lib_ic_arrow_back_light和R.drawable.lib_ic_menu_light)。对于密度/大小的桶,您不需要多个drawable,并且样式将在xml中完成。此外,最终产品将与框架相同。
mDrawerToggle.setDrawerIndicatorEnabled(false);
CustomDrawerArrowDrawable toolbarNavigationIcon
= new CustomDrawerArrowDrawable(this, mToolbar.getContext());
if (showHomeAsUp) {
toolbarNavigationIcon.setIndicator(
CustomDrawerArrowDrawable.HOME_AS_UP_INDICATOR);
mDrawerToggle.setToolbarNavigationClickListener(view -> finish());
} else {
mToolbarNavigationIcon.setIndicator(
CustomDrawerArrowDrawable.DRAWER_INDICATOR);
mDrawerToggle.setToolbarNavigationClickListener(view -> toggleDrawer());
}
mDrawerToggle.setHomeAsUpIndicator(toolbarNavigationIcon);
现在有专门的方法来禁用动画:toggle.setDrawerSlideAnimationEnabled(false)
这是我使用的一个片段:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
[...]
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
toggle.setDrawerSlideAnimationEnabled(false);
drawer.addDrawerListener(toggle);
toggle.syncState();
}
禁用onDrawerSlide()
方法中的超级调用将停止Arrow和Burger之间的动画。只有当抽屉完全打开或完全关闭时,您才会看到切换(没有动画)。
mActionBarDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.open, R.string.closed) {
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
//super.onDrawerSlide(drawerView, slideOffset);
}
};
mDrawerLayout.setDrawerListener(mActionBarDrawerToggle);
如果您不想要动画,请不要使用ActionBarDrawerToggle
。请改用以下代码。
toolbar.setNavigationIcon(R.drawable.ic_menu);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
drawer.openDrawer(GravityCompat.START);
}
});
要删除汉堡包菜单动画,您可以这样做:
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, mDrawer, mToolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
toggle.setDrawerSlideAnimationEnabled(false);