Android棒棒糖工具栏在打开/关闭抽屉和后退按钮之间切换
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Android lollipop toolbar switch between open/close drawer and back button
提问by zagum
I had standart navigation drawer, but now i'm trying to modify it, using toolbar.
我有标准的导航抽屉，但现在我正在尝试使用工具栏对其进行修改。
Earlier my code looked like: MainActivity.java
早些时候我的代码看起来像： MainActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.v("MAIN", "CREATE");
initViews();
setListeners();
getFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
@Override
public void onBackStackChanged() {
shouldDisplayHomeUp();
}
});
mNavigationDrawerFragment = (NavigationDrawerFragment)
getFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
NavigationDrawerFragment.java
NavigationDrawerFragment.java
public void setUp(int fragmentId, DrawerLayout drawerLayout) {
mFragmentContainerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
((MainActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
((MainActivity) getActivity()).getSupportActionBar().setHomeButtonEnabled(true);
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout,
((MainActivity) getActivity()).getToolbar(),
R.string.navigation_drawer_open,
R.string.navigation_drawer_close) {
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if (!isAdded()) {
return;
}
getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!isAdded()) {
return;
}
if (!mUserLearnedDrawer) {
// The user manually opened the drawer; store this flag to prevent auto-showing
// the navigation drawer automatically in the future.
mUserLearnedDrawer = true;
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(getActivity());
sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
}
if (mDrawerListView != null) {
}
getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
super.onDrawerSlide(drawerView, slideOffset);
}
};
// If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
// per the navigation drawer design guidelines.
if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
mDrawerLayout.openDrawer(mFragmentContainerView);
}
// Defer code dependent on restoration of previous instance state.
mDrawerToggle.setDrawerIndicatorEnabled(true);
mDrawerLayout.post(new Runnable() {
@Override
public void run() {
mDrawerToggle.syncState();
}
});
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
Now i modified my code: MainActivity.java
现在我修改了我的代码： MainActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
if (mToolbar != null) {
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
initViews();
setListeners();
mNavigationDrawerFragment = (NavigationDrawerFragment)
getFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
shouldDisplayHomeUp();
getFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
@Override
public void onBackStackChanged() {
mBackCount++;
shouldDisplayHomeUp();
}
});
}
NavigationDrawerFragment.java
NavigationDrawerFragment.java
public void setUp(int fragmentId, DrawerLayout drawerLayout) {
mFragmentContainerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), mDrawerLayout,
((MainActivity) getActivity()).getToolbar(),
R.string.navigation_drawer_open,
R.string.navigation_drawer_close) {
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
if (!isAdded()) {
return;
}
getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if (!isAdded()) {
return;
}
if (!mUserLearnedDrawer) {
// The user manually opened the drawer; store this flag to prevent auto-showing
// the navigation drawer automatically in the future.
mUserLearnedDrawer = true;
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(getActivity());
sp.edit().putBoolean(PREF_USER_LEARNED_DRAWER, true).apply();
}
if (mDrawerListView != null) {
}
getActivity().invalidateOptionsMenu(); // calls onPrepareOptionsMenu()
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset) {
super.onDrawerSlide(drawerView, slideOffset);
}
};
// If the user hasn't 'learned' about the drawer, open it to introduce them to the drawer,
// per the navigation drawer design guidelines.
if (!mUserLearnedDrawer && !mFromSavedInstanceState) {
mDrawerLayout.openDrawer(mFragmentContainerView);
}
// Defer code dependent on restoration of previous instance state.
mDrawerToggle.setDrawerIndicatorEnabled(true);
mDrawerLayout.post(new Runnable() {
@Override
public void run() {
mDrawerToggle.syncState();
}
});
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
And shouldDisplayHomeUpfunction:
和shouldDisplayHomeUp函数：
public void shouldDisplayHomeUp (){
boolean canBack = getFragmentManager().getBackStackEntryCount() > 0;
mNavigationDrawerFragment.getDrawerToggle().setDrawerIndicatorEnabled(!canBack);
}
But the back arrow is not shown
但是没有显示后退箭头
I tried call
我试过打电话
getSupportActionBar().setDisplayHomeAsUpEnabled(canBack);
getSupportActionBar().setHomeButtonEnabled(canBack);
So the back arrow appers but clicking on it has no effect
所以后退箭头appers但点击它没有效果
回答by Pedro Oliveira
From the docs:
从文档：
To allow Up navigation with the app icon in the action bar, call setDisplayHomeAsUpEnabled():
要允许使用操作栏中的应用程序图标向上导航，请调用 setDisplayHomeAsUpEnabled()：
@Override public void onCreate(Bundle savedInstanceState) {
...
getActionBar().setDisplayHomeAsUpEnabled(true); }
This adds a left-facing caret alongside the app icon and enables it as an action button such that when the user presses it, your activity receives a call to onOptionsItemSelected(). The ID for the action is android.R.id.home.
这会在应用程序图标旁边添加一个朝左的插入符号，并将其启用为操作按钮，这样当用户按下它时，您的活动就会收到对 onOptionsItemSelected() 的调用。动作的 ID 是 android.R.id.home。
This means that you will have to implement your back routine on onOptionsItemSelectedand check for R.id.home. To avoid calling the routine when you click on the hamburger menu check for canbacktoo on onOptionsItemSelected.
这意味着，你将不得不执行你的背部在常规onOptionsItemSelected和检查R.id.home。为了避免调用程序时，你的汉堡包菜单检查点击canback过的onOptionsItemSelected。
http://developer.android.com/training/implementing-navigation/ancestral.html#up
http://developer.android.com/training/implementing-navigation/ancestral.html#up
EDIT
编辑
To archieve what you want you will have to implement your own navigation routine.
要归档您想要的内容，您必须实现自己的导航例程。
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(shouldBack()) {
//call onbackpressed or something
if(displayBackAgain)
return; //return after so you don't call syncState();
}else if (mNavigationDrawerFragment.isDrawerOpen())
mNavigationDrawerFragment.closeDrawer();
else
mNavigationDrawerFragment.openDrawer();
mNavigationDrawerFragment.getActionBarDrawerToggle().syncState();
}
});
}
To enable the backbutton icon just call getSupportActionBar().setDisplayHomeAsUpEnabled(true);to disable it just call mNavigationDrawerFragment.getActionBarDrawerToggle().syncState();
要启用后退按钮图标只需调用getSupportActionBar().setDisplayHomeAsUpEnabled(true);禁用它只需调用mNavigationDrawerFragment.getActionBarDrawerToggle().syncState();
回答by Son Nguyen Thanh
I found a way to control the back button and the nav. It worked with me. First , set up:
我找到了一种控制后退按钮和导航的方法。它和我一起工作。首先，设置：
private void setupNav () {
this.toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(this.toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
this.mActionBarDrawerToggle = new ActionBarDrawerToggle(this, this.mDrawerLayout, this.toolbar, 0, 0);
this.mActionBarDrawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//catch back button here.
}
});
this.mDrawerLayout.setDrawerListener(this.mActionBarDrawerToggle);
this.mActionBarDrawerToggle.syncState();
}
Important thing, this is the way I hide the hamburger and show the back button. You have to put this code in the place you want to show back button. I also lock the Nav when showing back button.
重要的是，这是我隐藏汉堡包并显示后退按钮的方式。您必须将此代码放在要显示后退按钮的位置。显示后退按钮时，我也会锁定导航。
if (!isShowBackButton) {
mActionBarDrawerToggle.setDrawerIndicatorEnabled(true);
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
} else {
mActionBarDrawerToggle.setDrawerIndicatorEnabled(false);
mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
//enable back button
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
