FATAL EXCEPTION: main java.lang.RuntimeException: Не удается запустить Activity ComponentInfo()

У меня есть эта проблема, и я следовал this ответам, но не смог решить мою проблему. Я думаю, что это точно так же.FATAL EXCEPTION: main java.lang.RuntimeException: Не удается запустить Activity ComponentInfo()

Я хотел создать две разные вкладки на странице Activity, но оказалось, что она не работает.

Я не уверен, что не так с кодом.

MainActivity.java

package pasirgudangcouncilstate.infocenter; 

import android.graphics.Color; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v4.view.PagerTabStrip; 
import android.support.v4.view.ViewPager; 
import android.view.View; 
import android.support.design.widget.NavigationView; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuItem; 



public class MainActivity extends AppCompatActivity 
     implements NavigationView.OnNavigationItemSelectedListener { 


    NavigationView navigationView = null; 
    Toolbar toolbar = null; 

    ViewPager pager; 
    PagerTabStrip tab_strp; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     ActivityFragment mapager = new ActivityFragment(getSupportFragmentManager()); 

     pager = (ViewPager)findViewById(R.id.pager); 
     pager.setAdapter(mapager); 
     tab_strp=(PagerTabStrip)findViewById(R.id.tab_strip); 
     tab_strp.setTextColor(Color.WHITE); 

     //  Set Fragment Initially 
     UtamaFragment fragment = new UtamaFragment(); 
     android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
     fragmentTransaction.replace(R.id.fragment_container, fragment); 
     fragmentTransaction.commit(); 

     toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 

     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
       this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
     drawer.addDrawerListener(toggle); 
     toggle.syncState(); 

     navigationView = (NavigationView) findViewById(R.id.nav_view); 
     navigationView.setNavigationItemSelectedListener(this); 
    } 

    @Override 
    public void onBackPressed() { 
     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     if (drawer.isDrawerOpen(GravityCompat.START)) { 
      drawer.closeDrawer(GravityCompat.START); 
     } else { 
      super.onBackPressed(); 
     } 
    } 



    @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); 
    } 

    @SuppressWarnings("StatementWithEmptyBody") 
    @Override 
    public boolean onNavigationItemSelected(MenuItem item) { 
     // Handle navigation view item clicks here. 
     int id = item.getItemId(); 

     if (id == R.id.nav_home) { 

      //  Set Fragment Initially 
      UtamaFragment fragment = new UtamaFragment(); 
      android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
      fragmentTransaction.replace(R.id.fragment_container, fragment); 
      fragmentTransaction.commit(); 
      // Handle the camera action 
     } else if (id == R.id.nav_background) { 

      //  Set Fragment Initially 
      LatarBelakangFragment fragment = new LatarBelakangFragment(); 
      android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
      fragmentTransaction.replace(R.id.fragment_container, fragment); 
      fragmentTransaction.commit(); 

     } else if (id == R.id.nav_services) { 

      //  Set Fragment Initially 
      PerkhidmatanFragment fragment = new PerkhidmatanFragment(); 
      android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction(); 
      fragmentTransaction.replace(R.id.fragment_container, fragment); 
      fragmentTransaction.commit(); 

     } else if (id == R.id.nav_activity) { 

      ActivityFragment mapager = new ActivityFragment(getSupportFragmentManager()); 
      pager = (ViewPager)findViewById(R.id.pager); 

      pager.setAdapter(mapager); 
      tab_strp=(PagerTabStrip)findViewById(R.id.tab_strip); 
      tab_strp.setTextColor(Color.WHITE); 

     } else if (id == R.id.nav_contact) { 

     } 

     DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
     drawer.closeDrawer(GravityCompat.START); 
     return true; 
    } 
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/drawer_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true" 
    tools:openDrawer="start"> 

    <include 
     layout="@layout/app_bar_main" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" /> 

    <android.support.design.widget.NavigationView 
     android:id="@+id/nav_view" 
     android:layout_width="wrap_content" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     android:fitsSystemWindows="true" 
     app:headerLayout="@layout/nav_header_main" 
     app:menu="@menu/activity_main_drawer" /> 

    <android.support.v4.view.ViewPager 
     android:id="@+id/pager" 
     android:layout_width="match_parent" 
     android:layout_height="0dp" 
     android:layout_weight="1" /> 

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

Logcat

03-26 05:57:16.932 2158-2158/pasirgudangcouncilstate.infocenter I/art: Not late-enabling -Xcheck:jni (already on) 
    03-26 05:57:17.095 2158-2158/pasirgudangcouncilstate.infocenter W/System: ClassLoader referenced unknown path: /data/app/pasirgudangcouncilstate.infocenter-2/lib/x86 
    03-26 05:57:17.598 2158-2158/pasirgudangcouncilstate.infocenter D/AndroidRuntime: Shutting down VM 
    03-26 05:57:17.598 2158-2158/pasirgudangcouncilstate.infocenter E/AndroidRuntime: FATAL EXCEPTION: main 
Process: pasirgudangcouncilstate.infocenter, PID: 2158 
java.lang.RuntimeException: Unable to start activity ComponentInfo{pasirgudangcouncilstate.infocenter/pasirgudangcouncilstate.infocenter.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.PagerTabStrip.setTextColor(int)' on a null object reference 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
at android.app.ActivityThread.-wrap11(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.PagerTabStrip.setTextColor(int)' on a null object reference 
at pasirgudangcouncilstate.infocenter.MainActivity.onCreate(MainActivity.java:41) 
at android.app.Activity.performCreate(Activity.java:6237) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)  
at android.app.ActivityThread.-wrap11(ActivityThread.java)  
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)  
at android.os.Handler.dispatchMessage(Handler.java:102)  
at android.os.Looper.loop(Looper.java:148)  
at android.app.ActivityThread.main(ActivityThread.java:5417)  
at java.lang.reflect.Method.invoke(Native Method)  
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)  
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)  
    03-26 05:57:21.767 2158-2160/pasirgudangcouncilstate.infocenter W/art: Suspending all threads took: 7.989ms 
    03-26 05:57:24.039 2158-2160/pasirgudangcouncilstate.infocenter W/art: Suspending all threads took: 35.938ms 
    03-26 05:57:28.562 2158-2158/? I/Process: Sending signal. PID: 2158 SIG: 9

источник

2016-03-26 Ben Sc

post logcat здесь. –

Я прикрепил logcat –

Удалить йо ur и добавьте это напрямую.

<android.support.v4.view.ViewPager 
     android:id="@+id/pager" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     > 
    <android.support.v4.view.PagerTabStrip 
     android:id="@+id/tab_strp" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_gravity="top" 
     android:background="#33b5e5" 
     android:textColor="#fff" 
     android:paddingTop="5dp" 
     android:paddingBottom="5dp" />  

</android.support.v4.view.ViewPager>

и удалите эту строку также в своем рабочем коде.

tab_strp.setTextColor(Color.WHITE);

источник

2016-03-26 06:25:14

Я пробовал это, но все тот же, .. –

@BenScmidth вы решаете или нет? –

Я сейчас пытаюсь ... У меня уже был PagerTabStrip в xml, но он провалился, теперь все еще пытаюсь несколько раз. –

Прежде всего, я рекомендую использовать TabLayout вместо PagerTabStrip.

Во-вторых, я не вижу PagerTabStrip в любом месте вашего xml, поэтому вы получаете NullPointerException. Удалите его и попробуйте сделать ViewPager без него, а затем просто добавьте его после this учебник.

источник

2016-03-26 10:06:49 Vucko

FATAL EXCEPTION: main java.lang.RuntimeException: Не удается запустить Activity ComponentInfo()

ответ

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