我已经开始使用侧边菜单在我的应用中创建inflated的片段。问题是没有任何片段，其中一个是使用android studio模板自动生成的片段，似乎正在执行任何代码。
这可能是我错过了一些明显的事情，任何帮助都会受到赞赏。
这是我的MainActivity：
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.*;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
public class MainActivity extends ActionBarActivity
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_main);
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();
fragmentManager.beginTransaction()
.replace(R.id.container, PlaceholderFragment.newInstance(position + 1))
.commit();
}*/
@Override
public void onNavigationDrawerItemSelected(int position) {
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction transaction = fragmentManager.beginTransaction();
switch (position) {
case 1:
BlogFragment blogFragment = new BlogFragment();
transaction.replace(R.id.action_bar, blogFragment);
}
}
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 = getSupportActionBar();
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.main, 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;
}
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 = null;
rootView = inflater.inflate(R.layout.fragment_home, container, false);
switch(getArguments().getInt(ARG_SECTION_NUMBER)) {
case 1:
rootView = inflater.inflate(R.layout.fragment_home, container, false);
break;
case 2:
rootView = inflater.inflate(R.layout.fragment_blog, container, false);
break;
case 3:
rootView = inflater.inflate(R.layout.fragment_test, container, false);
break;
case 4:
//rootView = inflater.inflate(R.layout.fragment_info, container, false);
break;
default:
Log.e("TAG", "Unrecognized section: " + getArguments().getInt(ARG_SECTION_NUMBER));
}
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
以下是博客片段，它尝试打开webview：
import android.app.Activity;
import android.app.Fragment;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link BlogFragment.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {@link BlogFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class BlogFragment 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";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
/**
* 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 blog.
*/
// TODO: Rename and change types and number of parameters
public static BlogFragment newInstance(String param1, String param2) {
BlogFragment fragment = new BlogFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public BlogFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
WebView wv;
View view=inflater.inflate(R.layout.fragment_blog, null);
wv = (WebView) view.findViewById(R.id.webview);
WebSettings settings = wv.getSettings();
wv.setWebChromeClient(new WebChromeClient() {
});
final String mimeType = "text/html";
final String encoding = "UTF-8";
String html = getHTML();
settings.setJavaScriptEnabled(true);
wv.loadDataWithBaseURL("", html, mimeType, encoding, "");
return view;
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public String getHTML() {
String html = "<iframe width=\"100%\" height=\"100%\" src=\"http://www.bbc.co.uk\" frameborder=\"0\" allowfullscreen></iframe>";
return html;
}
/**
* 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
public void onFragmentInteraction(Uri uri);
}
}
提前致谢。
答案 0 :(得分：2)
要确定错误，您应该在switch语句中添加一个默认块：
switch(getArguments().getInt(ARG_SECTION_NUMBER)) {
case 1:
rootView = inflater.inflate(R.layout.fragment_home, container, false);
break;
case 2:
rootView = inflater.inflate(R.layout.fragment_blog, container, false);
break;
case 3:
rootView = inflater.inflate(R.layout.fragment_test, container, false);
break;
case 4:
//rootView = inflater.inflate(R.layout.fragment_info, container, false);
break;
default:
Log.e("TAG", "Unrecognized section: " + getArguments().getInt(ARG_SECTION_NUMBER));
}
在我看来，在调用onCreateView时没有设置参数。如果未设置，getInt()将返回0，这不属于switch语句中的任何一种情况。
修改
经过仔细检查后，我相信你应该对一个更简单的抽屉项目选择监听器很好：
@Override
public void onNavigationDrawerItemSelected(int position) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transation = fragmentManager.beginTransaction();
switch (position) {
case 1:
HomeFragment homeFragment = new HomeFragment();
homeFragment.setArguments(someArgs);
transation.replace(R.id.container, homeFragment);
break;
case 2:
BlogFragment blogFragment = new BlogFragment();
blogFragment.setArguments(someArgs);
transation.replace(R.id.container, blogFragment);
break;
case 3:
TestFragment testFragment = new TestFragment();
testFragment.setArguments(someArgs);
transation.replace(R.id.container, testFragment);
break;
case 4:
//rootView = inflater.inflate(R.layout.fragment_info, container, false);
break;
default:
return;
}
transation.commit();
}