android.view.InflateException: Binary XML file line #28: Error inflating class fragment
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【中文标题】android.view.InflateException: Binary XML file line #28: Error inflating class fragment【英文标题】： 【发布时间】：2015-01-13 01:25:45 【问题描述】：我正在尝试开发一个具有导航抽屉和片段来显示数据的应用程序。这是我的应用程序活动堆栈：
->登录（检查是否已登录，跳过加载视图并进入时间轴）
->时间线
这是我得到错误的方式：
->我启动应用程序
->它绕过登录屏幕，因为我已经登录了
->一切正常，然后我从菜单抽屉中单击注销或按返回按钮
->我回到登录屏幕
->现在如果我再次按登录并再次启动时间轴活动，我的应用程序崩溃...
这里是代码。这是日志猫：
11-15 21:11:52.050 18695-18695/lazarko.pocketformulas E/androidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfolazarko.pocketformulas/lazarko.pocketformulas.Timeline:
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2355)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)
at android.app.ActivityThread.access$600(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1335)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5520)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)
at dalvik.system.NativeStart.main(Native Method)
Caused by:
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:324)
at android.app.Activity.setContentView(Activity.java:1912)
at lazarko.pocketformulas.Timeline.onCreate(Timeline.java:35)
at android.app.Activity.performCreate(Activity.java:5066)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1101)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)
at android.app.ActivityThread.access$600(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1335)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5520)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.support.v4.widget.DrawerLayout.isDrawerView(DrawerLayout.java:1097)
at android.support.v4.widget.DrawerLayout.closeDrawer(DrawerLayout.java:1306)
at lazarko.pocketformulas.NavigationDrawerFragment.selectItem(NavigationDrawerFragment.java:209)
at lazarko.pocketformulas.NavigationDrawerFragment.onCreate(NavigationDrawerFragment.java:82)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:798)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1015)
at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1114)
at android.app.Activity.onCreateView(Activity.java:4722)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:324)
at android.app.Activity.setContentView(Activity.java:1912)
at lazarko.pocketformulas.Timeline.onCreate(Timeline.java:35)
at android.app.Activity.performCreate(Activity.java:5066)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1101)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2391)
at android.app.ActivityThread.access$600(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1335)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:155)
at android.app.ActivityThread.main(ActivityThread.java:5520)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)
at dalvik.system.NativeStart.main(Native Method)
这是我的活动代码：
public class Timeline extends FragmentActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks, SearchView.OnQueryTextListener
private static NavigationDrawerFragment mNavigationDrawerFragment;
private CharSequence mTitle;
public static Context context;
SearchView searchView;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_timeline);
context = getApplicationContext();
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));
public static Context getContext()
return context;
@Override
protected void onStart()
super.onStart();
@Override
protected void onResume()
super.onStart();
FragmentManager fragmentManager = getSupportFragmentManager();
SharedPreferences preferencesFragmentData = getSharedPreferences("fragmentData", 0);
String fragmentID = preferencesFragmentData.getString("currentFragment", "");
if(fragmentID == "FAVORITES_FRAGMENT")
fragmentManager.beginTransaction().replace(R.id.container, new Favorites()).commit();
else if (fragmentID == "TIMELINE_FRAGMENT")
fragmentManager.beginTransaction().replace(R.id.container, new PlaceholderFragment()).commit();
else if (fragmentID == "SETTINGS_FRAGMENT")
fragmentManager.beginTransaction().replace(R.id.container, new Settings()).commit();
@Override
protected void onPause()
super.onPause();
@Override
public void onNavigationDrawerItemSelected(int position)
FragmentManager fragmentManager = getSupportFragmentManager();
SharedPreferences preferencesFragmentData = getSharedPreferences("fragmentData", 0);
SharedPreferences.Editor editorFragmentData = preferencesFragmentData.edit();
switch(position)
case 1:
//Timeline clicked
editorFragmentData.putString("currentFragment", "TIMELINE_FRAGMENT");
editorFragmentData.commit();
fragmentManager.beginTransaction()
.replace(R.id.container, new PlaceholderFragment(), "TIMELINE_FRAGMENT")
.commit();
break;
case 2:
//Favorites clicked
editorFragmentData.putString("currentFragment", "FAVORITES_FRAGMENT");
editorFragmentData.commit();
fragmentManager.beginTransaction()
.replace(R.id.container, new Favorites(), "FAVORITES_FRAGMENT")
.commit();
break;
case 3:
//Settings clicked
editorFragmentData.putString("currentFragment", "SETTINGS_FRAGMENT");
editorFragmentData.commit();
fragmentManager.beginTransaction()
.replace(R.id.container, new Settings())
.commit();
break;
case 4:
//Log Out clicked
SharedPreferences loginDataPreferences = getSharedPreferences("loginData", 0);
SharedPreferences.Editor editorLogin = loginDataPreferences.edit();
editorLogin.putBoolean("loggedIn", false);
editorLogin.commit();
Intent intent = new Intent(getApplicationContext(), Login.class);
startActivity(intent);
break;
default:
editorFragmentData.putString("currentFragment", "TIMELINE_FRAGMENT");
editorFragmentData.commit();
fragmentManager.beginTransaction()
.replace(R.id.container, new PlaceholderFragment())
.commit();
break;
public void restoreActionBar()
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
@Override
public boolean onCreateOptionsMenu(Menu menu)
if(!mNavigationDrawerFragment.isDrawerOpen())
menu.clear();
getMenuInflater().inflate(R.menu.timeline, menu);
//restoreActionBar();
searchView = new SearchView(getActionBar().getThemedContext());
searchView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
searchView.setQueryHint(html.fromHtml("<font color=#FFFFFF>Search ... </font>"));
searchView.setOnQueryTextListener(this);
searchView.clearFocus();
menu.add("Search").setIcon(R.drawable.ic_action_action_search).setActionView(searchView).setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);
return true;
@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();
return false;
//User searched for a formula and pressed Enter
@Override
public boolean onQueryTextSubmit(String s)
SharedPreferences preferencesFragmentData = getSharedPreferences("fragmentData", 0);
String currentFragment = preferencesFragmentData.getString("currentFragment", "");
if(currentFragment == "TIMELINE_FRAGMENT")
//Log.e("TIMELINE", currentFragment + "IN THE IF FRAGMENT");
//Toast.makeText(getContext(), "You searched for: " + s + " in Timeline Fragment!", Toast.LENGTH_SHORT).show();
else if (currentFragment == "FAVORITES_FRAGMENT")
//Log.e("TIMELINE", currentFragment + "IN THE IF FRAGMENT");
//Toast.makeText(getContext(), "You searched for: " + s + " in FAVORITES Fragment!", Toast.LENGTH_SHORT).show();
//Hide the keyboard
InputMethodManager inputManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(this.getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
invalidateOptionsMenu();
return true;
//user started typing, this code block is for Autocomplete or Suggestions based on his current input
@Override
public boolean onQueryTextChange(String s)
return false;
这是显示的第一个片段：
/**
* Created by lazarnikolov on 11/8/14.
*/
public class PlaceholderFragment extends Fragment
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
private static View rootView;
FavoritesDatabaseAdapter favoritesDB;
SwipeRefreshLayout swipeRefreshLayout = null;
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public PlaceholderFragment()
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState)
super.onActivityCreated(savedInstanceState);
@Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container,
Bundle savedInstanceState)
if (rootView != null)
ViewGroup parent = (ViewGroup) rootView.getParent();
if (parent != null)
parent.removeView(rootView);
try
rootView = inflater.inflate(R.layout.fragment_timeline, container, false);
catch (InflateException e)
favoritesDB = new FavoritesDatabaseAdapter(getActivity().getApplicationContext());
final ContentValues contentValues = new ContentValues();
final LinearLayout llScrollViewContainerItems = (LinearLayout) container.findViewById(R.id.llScrollViewContainerItems);
llScrollViewContainerItems.removeAllViews();
ActionBar actionBar = getActivity().getActionBar();
final Typeface font = Typeface.createFromAsset(getActivity().getAssets(), "ubuntu.ttf");
actionBar.setBackgroundDrawable(new ColorDrawable(getResources().getColor(R.color.PeterRiver)));
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle("Timeline");
swipeRefreshLayout = (SwipeRefreshLayout) container.findViewById(R.id.container);
swipeRefreshLayout.setColorSchemeResources(R.color.Alizarin, R.color.Emerald, R.color.PeterRiver, R.color.Amethyst, R.color.WetAsphalt);
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() ...
return rootView;
@Override
public void onAttach(Activity activity)
super.onAttach(activity);
@Override
public void onStop()
super.onStop();
@Override
public void onDestroyView()
super.onDestroyView();
Fragment f = (Fragment) getFragmentManager()
.findFragmentByTag("TIMELINE_FRAGMENT");
if (f != null)
getFragmentManager().beginTransaction().remove(f).commit();
这是我的 activity_timeline.xml 文件，发生错误的地方：
<!-- A DrawerLayout is intended to be used as the top-level content view using match_parent for both width and height to consume the full space available. -->
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout"
android:layout_ android:layout_
tools:context=".Timeline">
<!-- As the main content view, the view below consumes the entire
space available using match_parent in both dimensions. -->
<android.support.v4.widget.SwipeRefreshLayout android:id="@+id/container" android:layout_
android:layout_ android:orientation="vertical">
<ScrollView
android:layout_
android:layout_
android:id="@+id/svContainerViews">
<LinearLayout android:id="@+id/llScrollViewContainerItems" android:layout_
android:layout_ android:orientation="vertical">
</LinearLayout>
</ScrollView>
</android.support.v4.widget.SwipeRefreshLayout>
<!-- android:layout_gravity="start" tells DrawerLayout to treat
this as a sliding drawer on the left side for left-to-right
languages and on the right side for right-to-left languages.
If you're not building against API 17 or higher, use
android:layout_gravity="left" instead. -->
<!-- The drawer is given a fixed width in dp and extends the full height of
the container. -->
<fragment android:id="@+id/navigation_drawer"
android:layout_ android:layout_
android:layout_gravity="start"
android:name="lazarko.pocketformulas.NavigationDrawerFragment"
tools:layout="@layout/fragment_navigation_drawer" />
</android.support.v4.widget.DrawerLayout>
还有我的登录活动类：
/**
* Created by lazarnikolov on 11/8/14.
*/
public class Login extends Activity
EditText etEmail, etPassword;
Button bLogin, bRegister;
Typeface font;
TextView tvLogIn;
@Override
protected void onCreate(final Bundle savedInstanceState)
super.onCreate(savedInstanceState);
SharedPreferences preferences = getSharedPreferences("loginData", 0);
boolean loggedIn = preferences.getBoolean("loggedIn", false);
if(loggedIn)
Intent intent = new Intent("android.intent.action.TIMELINE");
startActivity(intent);
SharedPreferences initialFragmentData = getSharedPreferences("fragmentData", 0);
SharedPreferences.Editor initialEditorFragmentData = initialFragmentData.edit();
initialEditorFragmentData.putString("currentFragment", "TIMELINE_FRAGMENT");
initialEditorFragmentData.commit();
setContentView(R.layout.login);
font = Typeface.createFromAsset(getAssets(), "ubuntu.ttf");
etEmail = (EditText) findViewById(R.id.etEmail);
etEmail.setTypeface(font);
etPassword = (EditText) findViewById(R.id.etPassword);
etPassword.setTypeface(font);
tvLogIn = (TextView) findViewById(R.id.tvRegister);
tvLogIn.setTypeface(font);
bLogin = (Button) findViewById(R.id.bLogin);
bLogin.setTypeface(font);
bLogin.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
SharedPreferences preferences = getSharedPreferences("loginData", 0);
SharedPreferences.Editor editor = preferences.edit();
editor.putBoolean("loggedIn", true);
editor.commit();
communicate();
Intent intent = new Intent("android.intent.action.TIMELINE");
//intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
);
bRegister = (Button) findViewById(R.id.bRegister);
bRegister.setTypeface(font);
bRegister.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent intent = new Intent("android.intent.action.REGISTER");
startActivity(intent);
);
// SERVER COMMUNICATION CLASS INITIALIZATION
private void communicate()
new GetData().execute();
// SERVER COMMUNICATION CLASS
private class GetData extends AsyncTask<Void, Void, String>
@Override
protected String doInBackground(Void... voids)
Looper.prepare();
String data = "";
InputStream inputStream = null;
try
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("*******");
String json = "";
JSONObject object = new JSONObject();
object.accumulate("email", etEmail.getText().toString());
object.accumulate("password", etPassword.getText().toString());
json = object.toString();
StringEntity se = new StringEntity(json);
httpPost.setEntity(se);
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-type", "application/json");
HttpResponse response = httpClient.execute(httpPost);
inputStream = response.getEntity().getContent();
if(inputStream != null)
Toast.makeText(getApplicationContext(), "Logged in!", Toast.LENGTH_SHORT).show();
else
Toast.makeText(getApplicationContext(), "Invalid username/password", Toast.LENGTH_SHORT).show();
catch(Exception e)
Log.e("log_tag", "Error in http connection: " + e.toString());
return data;
@Override
protected void onPostExecute(String result)
//Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show();
@Override onStart(), onRestart(), onResume()...
我一直在寻找太久，但我仍然找不到解决方案。请看一下并将您认为的问题发给我！
非常感谢！
【问题讨论】：
【参考方案1】：仔细看/调试lazarko.pocketformulas.NavigationDrawerFragment.java第209行（属于selectItem()方法）
根据您的堆栈跟踪，您可能有一个 null 或未正确初始化的对象
更新 要了解为什么有时会发生有时不会发生这种情况（如果我理解正确的话），还有更多问题要问。1)一段时间后开始活动时会发生这种情况吗？如果是这样，则可能与系统已释放资源并且您的活动已重新创建这一事实有关
2) 如果没有 - 你必须一步一步地寻找原因。 追踪对象在哪里被清空。可能是：
-- 在重新创建父对象时（当您没有正确初始化它时）
-- 在它的类中（只需 ctrl+f 全部出现）
——在其类之外。跟踪这个make对象private并声明setter方法
【讨论】：
是的，我知道它是 Null，而且我知道它在哪里，它在 setContentView(R.layout.activity_timeline);在我的时间轴类中，onCreate 方法。但我不知道为什么会这样。正如我上面写的，我进入那个活动，一切看起来都很好，看起来很正常，但是当我退出它并稍后尝试再次进入时，它会在 setContentView 上抛出 NullPointerException ... 不看，我启动应用程序，登录活动是第一个，但它被绕过了，因为我设置了一个规则，如果你登录了，登录屏幕不应该出现。绕过后出现时间轴屏幕。一切看起来都很好，没有错误没有崩溃。然后我点击注销，它给我带来了登录屏幕。同样，没有错误没有崩溃。之后，我单击登录按钮将我带到时间轴屏幕。并且它在崩溃发生时。当我两次访问时间轴活动时。时间线 > 登录 > 时间线。 对不起，没有确切的答案。但是如果它是空的（并且之前不是空的），那么必须是它被空的地方！请参阅更新 2)。通常原因很简单，你只需要找到它【参考方案2】：好的，我已经修复了这个错误。我一直在为意图使用错误的标志。这是修复：
intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
我在开始时间轴活动的地方插入了这个，也在注销按钮上插入了这个。现在我在 setContentView 上没有收到 NullPointerException 错误。
【讨论】：
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