我在片段活动中有一个OnClickListener，如下所示：
public class Menu1_Fragment extends Fragment {
Button CreateGroupButton;
View rootview;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootview = inflater.inflate(R.layout.menu1_layout, container, false);
CreateGroupButton = (Button) rootview.findViewById(R.id.create_study_group);
CreateGroupButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
Toast.makeText(getActivity().getApplicationContext(), "Test", Toast.LENGTH_LONG).show();
Intent intent = new Intent(Menu1_Fragment.this.getActivity(), CreateGroup.class);
startActivity(intent);
}
});
return rootview;
}
}
这是我的
menu1_layout.xml代码：<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:gravity="center_horizontal">
<Button
android:id="@+id/create_study_group"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/CreateGroupBtn"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="This is the page where you can create and view existing groups"
android:id="@+id/textView"
android:layout_below="@+id/create_study_group"/>
</RelativeLayout>
单击
Button时，将显示“测试”消息，但此后立即关闭该应用程序。这是
CreateGroup java类：public class CreateGroup extends Fragment{
View rootview;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootview = inflater.inflate(R.layout.create_group, container, false);
return rootview;
}
}
和
create_group.xml文件：<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:gravity="center_horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="This is the page where the form is displayed"
android:id="@+id/textView"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
NavigationActivity：
public class NavigationActivity extends FragmentActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks {
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
private NavigationDrawerFragment mNavigationDrawerFragment;
/**
* Used to store the last screen title. For use in {@link #restoreActionBar()}.
*/
private CharSequence mTitle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigation);
FragmentManager fragmentManager = getSupportFragmentManager();
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
@Override
public void onNavigationDrawerItemSelected(int position) {
// update the main content by replacing fragments
FragmentManager fragmentManager =getSupportFragmentManager();
Fragment fragment= new Fragment();
switch (position){
case 0:
mTitle = getString(R.string.title_section1);
fragment = new Menu1_Fragment();
break;
case 1:
mTitle = getString(R.string.title_section2);
fragment = new Menu2_Fragment();
break;
}
fragmentManager.beginTransaction()
.replace(R.id.container, fragment)
.commit();
}
public void onSectionAttached(int number) {
switch (number) {
case 1:
mTitle = getString(R.string.title_section1);
break;
case 2:
mTitle = getString(R.string.title_section2);
break;
case 3:
mTitle = getString(R.string.title_section3);
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.navigation, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
//if the log out button is selected, log out of Parse and go back to log in page
if (id == R.id.action_logout) {
ParseUser.logOut();
Intent intent = new Intent(NavigationActivity.this,LoginSignupActivity.class);
startActivity(intent);
Toast.makeText(getApplicationContext(), "Successfully Logged out", Toast.LENGTH_LONG).show();
finish();
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_navigation, container, false);
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((NavigationActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
我在弄清楚为什么
CreateGroup类/布局文件没有显示为新页面时遇到了麻烦。 最佳答案
CreateGroup是片段，因此您应该更改片段而不是开始活动：
CreateGroupButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view){
Toast.makeText(getActivity().getApplicationContext(), "Test", Toast.LENGTH_LONG).show();
// Create new fragment and transaction
Fragment createGroupFragment = new CreateGroup();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, createGroupFragment)
.commit();
}
});