实现并按预期工作,因此没有值得在此发布的代码,只是想知道有没有人有加快抽屉打开和关闭所需时间的经验?例如,YouTube 应用程序要快得多!
实现并按预期工作,因此没有值得在此发布的代码,只是想知道有没有人有加快抽屉打开和关闭所需时间的经验?例如,YouTube 应用程序要快得多!
你可以调整动画的持续时间,但需要复制支持库中的类,并进行相应的编辑。
ViewDragHelper
然后在调用ViewDragHelper.smoothSlideViewTo
时,将其应用于DrawerLayout
您需要创建修改版的ViewDragHelper.forceSettleCapturedViewAt
,并传入持续时间参数。
forceSettleCapturedViewAt(... int duration)
然后创建你自己版本的ViewDragHelper.smoothSlideViewTo
。
public boolean smoothSlideViewTo(... int duration) {
...
return forceSettleCapturedViewAt(... int duration);
}
抽屉布局 (DrawerLayout)
接下来,您需要修改DrawerLayout.closeDrawer
和DrawerLayout.closeDrawers
以配合您的新ViewDragHelper
修改。
操作栏切换器 (ActionBarDrawerToggle)
您还需要复制ActionBarDrawerToggle
和ActionBarDrawerToggleHoneycomb
。但这些文件不需要进行任何编辑。
startActivity()
而不调用closeDrawer()
。虽然你看不到抽屉关闭,但活动过渡动画仍然提供了一个相当不错的效果,并且它立即发生,无需等待抽屉关闭动画先完成,没有卡顿,感知延迟也大大缩短。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后强制该活动重新创建(recreate()
),但可以通过其他方法解决这个问题)。你还需要确保只在导航后关闭抽屉,而不是在方向更改后关闭抽屉,但这很容易解决。onCreate()
调用closeDrawer()
将使抽屉开始处于关闭状态,但从onResume()
调用closeDrawer()
将关闭带有动画的抽屉,该动画对用户短暂可见。DrawerLayout
没有提供任何在没有动画的情况下关闭抽屉的方法,但可以添加一个。DrawerLayout
在扩展的LayoutParams
中保留了一些内部状态,用于知道抽屉是否打开。如果您只是将抽屉移出屏幕,则它将无法知道它已关闭,这将导致其他问题。(例如,在下一个方向更改时抽屉将重新出现。)android.support.v4.widget
包中的类,以访问其默认(包私有)部分,或者扩展DrawerLayout
,而无需复制它需要的任何其他类。这也将减轻更新代码以适应支持库未来更改的负担。(尽可能隔离代码与实现细节之间的联系总是最好的。) 您可以使用moveDrawerToOffset()
来移动抽屉,并设置LayoutParams
,使其知道抽屉已关闭。// 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:如果仅调用moveDrawerToOffset()
而不更改LayoutParams
,则抽屉将在下一个方向更改时返回到其打开的位置。
这种方法添加了一个实用程序类到support.v4包中,以获得访问我们需要的DrawerLayout内部的package-private部分。
将此类放入/src/android/support/v4/widget/中:
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);
/**/
}
}
当您导航离开时,在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);
}
在onResume()
中使用setDrawerClosed()
方法关闭抽屉,且不带动画:
@Overrid6e
protected void onResume() {
super.onResume();
if(mCloseNavDrawer && mDrawerLayout != null && mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
Support4Widget.setDrawerClosed(mDrawerLayout, GravityCompat.START);
mCloseNavDrawer = false;
}
}
此方法扩展了DrawerLayout,以添加setDrawerClosed()方法。
将此类放入/src/android/support/v4/widget/中:
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"
>
当您导航离开时,请在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);
}
在 onResume()
中使用 setDrawerClosed()
方法关闭抽屉,无需动画效果:
@Overrid6e
protected void onResume() {
super.onResume();
if(mCloseNavDrawer && mDrawerLayout != null && mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
mDrawerLayout.setDrawerClosed(GravityCompat.START);
mCloseNavDrawer = false;
}
}
我发现这是避免卡顿而没有任何长时间感知延迟的最佳方法。
你几乎可以使用类似的技术来模拟在到达活动后关闭抽屉,通过在意图中传递一个值告诉新活动从onCreate()
打开其抽屉而不带任何动画,然后在活动布局完成后将其关闭动画化,但在我的实验中,活动转换破坏了模拟效果,所以你还需要禁用它。
这不允许您更改动画速度,但是如果您只想立即关闭抽屉,您可以使用支持库v24中的新DrawerLayout.closeDrawer(int/View, bool)
方法:
drawerLayout.closeDrawer(Gravity.LEFT, false);
首先从以下链接下载源代码文件:
和
然后将以上两个文件复制到您的应用程序util包中(或任何您想要的位置),并在您的活动中引用此抽屉布局,而不是android.support.v4.widget.DrawerLayout。在活动的布局文件中更改抽屉布局引用。
现在进行调整。
private static final int MAX_SETTLE_DURATION = 600; // ms
关于ViewDrawerHelper,要加快速度只需增加值,要减慢速度只需降低值。
如果您想在操作栏切换按钮上添加动作,则从以下链接下载源文件:
ActionBarDrawerToggleJellybeanMR2.java
ActionBarDrawerToggleHoneycomb.java
将上述文件复制到应用程序的util包中(或者您想要的任何位置)注意:确保每个新添加文件的导入包都引用了您的应用程序项目中的文件,而不是android.support.v4.widget.*;
如果以上链接无法使用,请添加http://。
如果您想立即强制隐藏左侧面板而不进行任何动画,您可以简单地设置其x值。当抽屉布局打开时,其左侧面板的x值变为0,关闭时变为-1 *(其宽度)。因此,如果您在打开时将x值设置为-2 *宽度,则左侧面板会立即消失。当然,在关闭后不要忘记将x设置为-1 *宽度。
DisplayMetrics metrics = new DisplayMetrics();
this.getWindowManager().getDefaultDisplay().getMetrics(metrics);
//obtain left panel's width in px
private float mToggleStartX=-260*metrics.density; //260 is the width of left panel in dpi
//while drawer layout is opened, to disappear left panel
ll_drawerLayoutMenuPanel.setX(mToggleStartX*2); //ll_drawerLayoutMenuPanel is the left panel layout
mDrawerLayout.closeDrawers();
//don't forget reset x value in the onDrawerClosed method.
mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout,mainToolBar,R.string.drawer_open,R.string.drawer_close) {
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
ll_drawerLayoutMenuPanel.setX(mToggleStartX);
}
......
};
我相信你问题的真正意思是,如何在点击抽屉菜单中启动新活动后使动画更加流畅。
如果这是你的问题意思,那么这就是我的做法。
mLeftDrawer.ItemClick += delegate (object sender, Android.Widget.AdapterView.ItemClickEventArgs e)
{
// Mark that item is selected and ask redraw
e.View.Selected = true;
adapter.NotifyDataSetChanged();
var handler = new Handler();
handler.PostDelayed(new Java.Lang.Runnable(() =>
{
_mLeftDrawerLayout.CloseDrawers();
// Here you should call your activity
}), 100);
};
根据以下内容,在一定延迟后关闭抽屉
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
yourFunction();
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
drawer.closeDrawer(GravityCompat.START);
}
}, 100);
return true;
}