:)我开始使用Tabs和片段做一个应用程序，但是在按钮按下按钮时，在片段的类中按下按钮没有任何反应
有fragment_sub_page02.xml：
<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"
tools:context="layout.SubPage02">
<Button
android:id="@+id/button"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_margin="8dp"
android:text="Button"
/>
那是SubPage02.java：
public class SubPage02 extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
Button mbutton;
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public SubPage02() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment SubPage02.
*/
// TODO: Rename and change types and number of parameters
public static SubPage02 newInstance(String param1, String param2) {
SubPage02 fragment = new SubPage02();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
LinearLayout mLinearLayout = (LinearLayout) inflater.inflate(R.layout.fragment_sub_page02,
container, false);
// note that we're looking for a button with id="@+id/myButton" in your inflated layout
// Naturally, this can be any View; it doesn't have to be a button
Button mButton = (Button) mLinearLayout.findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// here you set what you want to do when user clicks your button,
// e.g. launch a new activity
}
});
// after you've done all your manipulation, return your layout to be shown
return mLinearLayout;
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
在onclick中输入了几个东西后没发生任何事...... 我应该把按钮的功能放在哪里......？
感谢大家！ :)
编辑1（MainActivity.java）：
import java.util.zip.Inflater;
public class MainActivity extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
public FloatingActionButton fab;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
mViewPager.setCurrentItem(tab.getPosition());
animateFab(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
public static class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
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;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (getArguments().getInt(ARG_SECTION_NUMBER) == 2) {
View rootView = inflater.inflate(R.layout.fragment_blank, container, false);
return rootView;
} else if (getArguments().getInt(ARG_SECTION_NUMBER) == 1) {
View rootView = inflater.inflate(R.layout.fragment_sub_page02, container, false);
return rootView;
} else {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "AlertDialog";
case 1:
return "Toast";
case 2:
return "Snackbar";
}
return null;
}
}
答案 0 :(得分：1)
每次选择新页面时，TabLayout都需要PlaceholderFragment的新实例，因此请让我们仔细查看其onCreateView()：
根据getArguments().getInt(ARG_SECTION_NUMBER)的值，特定布局会膨胀。如果值为1，则布局将与SubPage02的布局相同。
但这并不意味着将创建SubPage02的实例，它们碰巧共享相同的布局文件。
因此必须在OnClickListener的{{1}}中设置onCreateView()：
PlaceholderFragment答案 1 :(得分：0)
您正在查找的ID是myButton，而您写的是button。此外，XML布局fragment_sub_page02。对于inflater，请尝试getLayoutInflater()。
View view = getLayoutInflater().inflate(R.layout.fragment_sub_page02,
container, false);
// note that we're looking for a button with id="@+id/myButton" in your inflated layout
// Naturally, this can be any View; it doesn't have to be a button
Button mButton = (Button) view.findViewById(R.id.myButton);
mButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// here you set what you want to do when user clicks your button,
// e.g. launch a new activity
}
});
// after you've done all your manipulation, return your layout to be shown
return view;
如果有帮助，请告诉我。