Панель инструментов и NavigationDrawer

Question

Я пытаюсь включить материальный дизайн в существующий проект, в котором используется NavigationFragment. Так что я пытаюсь использовать панель инструментов вместо ActionBar. Я последовал за this гидом, и я заменил все getActionBar() на getSupportActionBar(), но мое приложение всегда терпит крах при запуске.

activity_main.xml

<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_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="com.andreapivetta.mypckg.MainActivity"> 

    <FrameLayout 
     android:id="@+id/container" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

    <fragment 
     android:id="@+id/navigation_drawer" 
     android:name="com.andreapivetta.mypckg.NavigationDrawerFragment" 
     android:layout_width="240dp" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" /> 


    <android.support.v7.widget.Toolbar 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:background="?attr/colorPrimaryDark"/> 

</android.support.v4.widget.DrawerLayout> 

MainActivity

public class MainActivity extends ActionBarActivity 
    implements NavigationDrawerFragment.NavigationDrawerCallbacks { 

private NavigationDrawerFragment mNavigationDrawerFragment; 
private CharSequence mTitle; 
private static SharedPreferences mSharedPreferences; 
static final String PREF_KEY_TWITTER_LOGIN = "isTwitterLogedIn"; 
static final String PREF_SELECTED_INDEX = "SELECTED_POSITION"; 
private ConnectionDetector connectionDetector; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    if (toolbar != null) { 
     setSupportActionBar(toolbar); 
    } 

    mSharedPreferences = getSharedPreferences("MyPref", 0); 
    setContentView(R.layout.activity_main); 

    connectionDetector = new ConnectionDetector(this); 

    startService(new Intent(getApplicationContext(), StartupService.class)); 
} 

@Override 
public void onResume() { 
    super.onResume(); 

    if (isTwitterLoggedInAlready()) { 
     mNavigationDrawerFragment = (NavigationDrawerFragment) 
       getFragmentManager().findFragmentById(R.id.navigation_drawer); 
     mTitle = getTitle(); 

     DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); 
     setDrawerLeftEdgeSize(this, mDrawerLayout, 0.3f); 

     mNavigationDrawerFragment.setUp(R.id.navigation_drawer, mDrawerLayout); 

     if (mSharedPreferences.getBoolean("FIRST_LAUNCH", true)) { 
      mSharedPreferences.edit().putBoolean("FIRST_LAUNCH", false).apply(); 
     } 
    } else { 
     if (connectionDetector.isConnectingToInternet()) { 
      Fragment fragment = new LoginFragment(); 
      FragmentManager fragmentManager = getSupportFragmentManager(); 

      fragmentManager.beginTransaction() 
        .replace(R.id.container, fragment).commit(); 
     } else { 
      Toast.makeText(this, "internet connection required", 
        Toast.LENGTH_LONG).show(); 
     } 
    } 
} 

@Override 
public void onNavigationDrawerItemSelected(int position) { 
    Fragment fragment; 
    FragmentManager fragmentManager = getSupportFragmentManager(); 

    mSharedPreferences.edit().putInt(PREF_SELECTED_INDEX, position).apply(); 

    switch (position) { 
     case 0: 
      fragment = new MainFragment(); 
      fragmentManager.beginTransaction() 
        .replace(R.id.container, fragment).commit(); 
      setTitle(getResources().getString(R.string.app_name)); 
      break; 
     case 1: 
      ... 
     case 2: 
      ... 
     case 3: 
      ... 
    } 
} 

@Override 
public void setTitle(CharSequence title) { 
    mTitle = title; 
    getSupportActionBar().setTitle(mTitle); 
} 

public void restoreActionBar() { 
    android.support.v7.app.ActionBar actionBar = getSupportActionBar(); 
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); 
    actionBar.setDisplayShowTitleEnabled(true); 
    actionBar.setTitle(mTitle); 
} 
} 

Вход

10-28 14:20:29.085 32367-32367/com.andreapivetta.mypckg E/AndroidRuntime﹕ FATAL EXCEPTION: main 
Process: com.andreapivetta.mypckg, PID: 32367 
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.andreapivetta.mypckg/com.andreapivetta.mypckg.MainActivity}: android.view.InflateException: Binary XML file line #20: Error inflating class fragment 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184) 
     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 
     at android.app.ActivityThread.access$800(ActivityThread.java:135) 
     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
     at android.os.Handler.dispatchMessage(Handler.java:102) 
     at android.os.Looper.loop(Looper.java:136) 
     at android.app.ActivityThread.main(ActivityThread.java:5001) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
Caused by: android.view.InflateException: Binary XML file line #20: Error inflating class fragment 
     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713) 
     at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
     at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
     at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:228) 
     at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102) 
     at com.andreapivetta.mypckg.MainActivity.onCreate(MainActivity.java:56) 
     at android.app.Activity.performCreate(Activity.java:5231) 
     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 
            at android.app.ActivityThread.access$800(ActivityThread.java:135) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:136) 
            at android.app.ActivityThread.main(ActivityThread.java:5001) 
            at java.lang.reflect.Method.invoke(Native Method) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference 
     at com.andreapivetta.mypckg.MainActivity.setTitle(MainActivity.java:155) 
     at com.andreapivetta.mypckg.MainActivity.onNavigationDrawerItemSelected(MainActivity.java:128) 
     at com.andreapivetta.mypckg.NavigationDrawerFragment.selectItem(NavigationDrawerFragment.java:247) 
     at com.andreapivetta.mypckg.NavigationDrawerFragment.onCreate(NavigationDrawerFragment.java:93) 
     at android.app.Fragment.performCreate(Fragment.java:1678) 
     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:859) 
     at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1040) 
     at android.app.FragmentManagerImpl.addFragment(FragmentManager.java:1142) 
     at android.app.Activity.onCreateView(Activity.java:4786) 
     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689) 
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:492) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:397) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:353) 
            at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:228) 
            at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102) 
            at com.andreapivetta.mypckg.MainActivity.onCreate(MainActivity.java:56) 
            at android.app.Activity.performCreate(Activity.java:5231) 
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233) 
            at android.app.ActivityThread.access$800(ActivityThread.java:135) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:136) 
            at android.app.ActivityThread.main(ActivityThread.java:5001) 
            at java.lang.reflect.Method.invoke(Native Method) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 

Что я делаю неправильно?

Answer 1

в вашем onCreate вы никогда не установить содержание, прежде чем пытаться получить доступ к панели инструментов Вид

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
if (toolbar != null) { 
    setSupportActionBar(toolbar); 
} 

mSharedPreferences = getSharedPreferences("MyPref", 0); 
setContentView(R.layout.activity_main); 

вам необходимо установить содержание первого для вашей деятельности, прежде чем вы можете получить доступ к нему

setContentView(R.layout.activity_main); 
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
if (toolbar != null) { 
    setSupportActionBar(toolbar); 
} 

mSharedPreferences = getSharedPreferences("MyPref", 0); 

Answer 2

Вы необходимо изменить свой код в методе onCreate(), как предложено tyczy.

Существует другой вопрос с вашим расположением. Вы используете 3 вида внутри своего DrawerLayout, в то время как вы должны использовать 2 вида.

Вы должны изменить макет, например:

<android.support.v4.widget.DrawerLayout> 

    <LinearLayout> 

    <Toolbar..> 

    <FrameLayout 
     android:id="@+id/container" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

    </LinearLayout> 

    <fragment 
     android:id="@+id/navigation_drawer" 
     android:name="com.andreapivetta.mypckg.NavigationDrawerFragment" 
     android:layout_width="240dp" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" /> 

</DrawerLayout> 

Answer 3

У меня была аналогичная проблема. Для меня это решило, что я переместил метод selectItem(..) в NavigationDrawerFragment от onCreateView() до onActivityCreated().

@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
    selectItem(mCurrentSelectedPosition); 
    super.onActivityCreated(savedInstanceState); 
}