我最近开始更新我的应用程序，以使用 Android 5.0 中引入的带有抽屉导航的新工具栏组件。应用程序的流程是:MainActivity，它有一个工具栏、带菜单的抽屉导航 1. 主页 2. 购物车。
主页菜单通过其中的一个按钮导航到“主页详细信息”。
“MainActivity”的布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar" />
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<FrameLayout android:id="@+id/activity_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<ListView
android:id="@+id/left_drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@android:color/white"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:listSelector="@android:color/transparent" />
</android.support.v4.widget.DrawerLayout>
我在从抽屉中选择的菜单的“MainActivity”上添加两个 fragment HomeFragment，CartFragment，默认选择位置 0，即“Home”
类“MainActivity.java”::
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTitle = mDrawerTitle = getTitle();
drawer = (DrawerLayout) findViewById(R.id.drawer);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
tvTitle = (TextView) mToolbar.findViewById(R.id.toolbar_title);
if (mToolbar != null) {
setSupportActionBar(mToolbar);
}
mDrawerToggle = new ActionBarDrawerToggle(this, drawer,mToolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close) {
public void onDrawerClosed(View view) {
getSupportActionBar().setTitle(mTitle);
}
public void onDrawerOpened(View drawerView) {
getSupportActionBar().setTitle(mDrawerTitle);
}
};
drawer.setDrawerListener(mDrawerToggle);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
dataList = new ArrayList<DrawerItem>();
dataList.add(new DrawerItem(Constants.V_HOME, R.drawable.ic_launcher));
dataList.add(new DrawerItem(Constants.V_MY_CART, R.drawable.ic_launcher));
mDrawerList.setAdapter(adapterDrawer);
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
// to show first "Home fragment" on start up of application
if(savedInstanceState==null)
SelectItem(0);
}
public void SelectItem(int position) {
Fragment fragment = null;
switch (position) {
case 0:
fragment = new HomeFragment();
replaceFragment(fragment, Constants.V_TAG_HOME,false,"Home");
break;
case 1:
fragment = new CartFragment();
replaceFragment(fragment, Constants.V_TAG_MY_CART,false,"My Cart");
break;
}
drawer.closeDrawer(mDrawerList);
}
public void replaceFragment(Fragment fragment,String fragment_tag,boolean showHome,String title){
frgManager = this.getSupportFragmentManager();
FragmentTransaction ft = frgManager.beginTransaction();
ft.replace(R.id.activity_frame,fragment,fragment_tag);
if(showHome)
ft.addToBackStack(null);
ft.commit();
shouldDisplayHomeUp(showHome);
}
public void shouldDisplayHomeUp(boolean showHome){
if(showHome){
mDrawerToggle.setDrawerIndicatorEnabled(false);
drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}else{
mDrawerToggle.setDrawerIndicatorEnabled(true);
drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
getSupportActionBar().setHomeButtonEnabled(false);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId())
{
case android.R.id.home:
Toast.makeText(getApplicationContext(),"main act clicked", Toast.LENGTH_SHORT).show();
return false;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
if(frgManager.getBackStackEntryCount()>0){
getSupportFragmentManager().popBackStack();
// show the drawer icon when on moving back
shouldDisplayHomeUp(false);
}else{
super.onBackPressed();
}
mDrawerToggle.syncState();
}
我的主页 fragment 在单击按钮时有按钮“详细信息”，替换为其他 fragment :“HomeDetailFragment”
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/btnDetail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Home detail" />
<FrameLayout
android:id="@+id/home_frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
class "HomeFragment.java"btnDetail click 事件替换其他 fragment "HomeDetailFragment"::
btnDetail.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Fragment fragment = new HomeDetailFragment();
((MainActivity)getActivity()).showDrawerIndicator(false);
FragmentManager frManager = getActivity().getSupportFragmentManager();
FragmentTransaction ft = frManager.beginTransaction();
ft.addToBackStack(null);
ft.replace(R.id.activity_frame, fragment).commit();
}
});
类“HomeDetailFragment.java”::
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
// update the actionbar to show the up carat/affordance
((MainActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// TODO Auto-generated method stub
super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// your code for order here
Toast.makeText(getActivity(), "home detail", Toast.LENGTH_LONG).show();
((MainActivity)getActivity()).onBackPressed();
return true;
}
return true;
}
我的问题::
<强>1。在“HomeDetailFragment”中，我可以看到“UP 主页图标”，但无法获取主页图标 onOptionsItemSelected 未被调用的点击事件，因此无法导航回 HomeFragment
<强>2。当按下电话后退按钮并再次导航到“主页详细信息”时，它没有显示“UP 主页图标”
请指导我。
最佳答案
- In "HomeDetailFragment", I can see the "UP home icon" but cannot get the click event of home icon onOptionsItemSelected not being called, so cant navigate back to HomeFragment
实现此目的的一种方法是使用 MainActivity 中的 Toolbar，如下所示:
Toolbar mToolbar= ((MainActivity)getActivity()).mToolbar;
mToolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_nav_back));
mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("MrE", "home selected");
}
});
- When pressing the Phone Back Button, and again navigating to "Home Detail" it is not showing "UP home icon"
你的代码没有被调用的原因是因为它在你的 fragment 的 onCreate 中。将其移动到 onCreateOptionsMenu 而不是让它更新。
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// Put toolbar stuff from above here
super.onCreateOptionsMenu(menu, inflater);
}
关于android - 使用新工具栏组件、隐藏和显示抽屉导航图标、Home Up 图标从 fragment 中单击事件的问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27270722/