Android Studioを使用すると、「MyApp残念なことに停止しました」

Question

Android用のプログラミングには新しく、番号を入力するためにボタンを押す必要があるAndroidスタジオでアプリケーションを開発しています。私の問題は電話でアプリケーションをテストすることですデバッグモードでは、私は、このメッセージを送信してすぐに閉じられるアプリを開いたとき： "残念なことにMyAppが停止しました"。私はLogcatで自分のコードを持っています。私はここに私のMainActivityが

package com.example.dom.myapp; 
import android.os.StrictMode; 
import android.support.design.widget.TabLayout; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 

public class MainActivity extends AppCompatActivity { 

    private static final String TAG = "MainActivity"; 

    private SectionPagerAdapter mSectionPagerAdapter; 

    private ViewPager mViewPager; 


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

     mSectionPagerAdapter = new SectionPagerAdapter(getSupportFragmentManager()); 

     mViewPager = (ViewPager) findViewById(R.id.container); 
     setupViewPager(mViewPager); 

     TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
     tabLayout.setupWithViewPager(mViewPager); 

     tabLayout.getTabAt(0).setIcon(R.drawable.ic_prayer); 
     tabLayout.getTabAt(1).setIcon(R.drawable.ic_cam); 
     tabLayout.getTabAt(2).setIcon(R.drawable.ic_person); 

    } 

    private void setupViewPager(ViewPager ViewPager) { 
     SectionPagerAdapter adapter = new SectionPagerAdapter(getSupportFragmentManager()); 
     adapter.addFragment(new Tab1Fragment()); 
     adapter.addFragment(new Tab2Fragment()); 
     adapter.addFragment(new Tab3Fragment()); 
     ViewPager.setAdapter(adapter); 

そして、ここに私のLogCatが

04-25 16:04:59.356 3751-3751/? E/Zygote: MountEmulatedStorage() 
04-25 16:04:59.356 3751-3751/? E/Zygote: v2 
04-25 16:04:59.376 3751-3751/? E/SELinux: [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL 
04-25 16:05:00.786 3751-3751/com.example.dom.myapp E/AndroidRuntime: FATAL EXCEPTION: main 
                    Process: com.example.dom.myapp, PID: 3751 
                    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.dom.myapp/com.example.dom.myapp.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.design.widget.TabLayout.setupWithViewPager(android.support.v4.view.ViewPager)' on a null object reference 
                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3120) 
                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3219) 
                     at android.app.ActivityThread.access$1000(ActivityThread.java:198) 
                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1676) 
                     at android.os.Handler.dispatchMessage(Handler.java:102) 
                     at android.os.Looper.loop(Looper.java:145) 
                     at android.app.ActivityThread.main(ActivityThread.java:6838) 
                     at java.lang.reflect.Method.invoke(Native Method) 
                     at java.lang.reflect.Method.invoke(Method.java:372) 
                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404) 
                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199) 
                     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.design.widget.TabLayout.setupWithViewPager(android.support.v4.view.ViewPager)' on a null object reference 
                     at com.example.dom.myapp.MainActivity.onCreate(MainActivity.java:29) 
                     at android.app.Activity.performCreate(Activity.java:6535) 
                     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1120) 
                     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3073) 
                     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3219)  
                     at android.app.ActivityThread.access$1000(ActivityThread.java:198)  
                     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1676)  
                     at android.os.Handler.dispatchMessage(Handler.java:102)  
                     at android.os.Looper.loop(Looper.java:145)  
                     at android.app.ActivityThread.main(ActivityThread.java:6838)  
                     at java.lang.reflect.Method.invoke(Native Method)  
                     at java.lang.reflect.Method.invoke(Method.java:372)  
                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)  
                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)  

だのです

<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context="com.example.dom.myapp.MainActivity" 
    android:background="@color/colorWhite"> 

    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/relLayout"> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="50dp" 
      android:id="@+id/relLayoutTopBar" 
      android:layout_alignParentTop="true"> 

      <android.support.design.widget.AppBarLayout 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"> 

       <android.support.v7.widget.Toolbar 
        android:id="@+id/toolbarTop" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:background="@drawable/white_gray_border_bottom"> 


       </android.support.v7.widget.Toolbar> 

      </android.support.design.widget.AppBarLayout> 

     </RelativeLayout> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="50dp" 
      android:id="@+id/relLayoutBotBar" 
      android:layout_alignParentBottom="true"> 

      <android.support.design.widget.BottomNavigationView 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:id="@+id/bottomNavView_Bar" 
       android:background="@drawable/white_gray_border_top" 
       app:menu="@menu/bottom_navigation_menu"> 



      </android.support.design.widget.BottomNavigationView> 


     </RelativeLayout> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="50dp" 
      android:id="@+id/relLayoutMiddle" 
      android:layout_below="@+id/relLayoutTopBar" 
      android:layout_above="@+id/relLayoutBotBar" /> 

     <android.support.v4.view.ViewPager 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:id="@+id/container"> 

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

     </RelativeLayout> 

</android.support.design.widget.CoordinatorLayout> 

サムスンSM-G360T1（アンドロイド、5.1.1、API 22）を使用しています

Answer 1

<android.support.v4.view.ViewPager 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:id="@+id/container"> 

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

あなたのアクティビティにViewPagerのIDを追加するだけです_main.xml。