我無法更改文本字段的文本

Question

我試圖更改FragmentPager適配器的文本字段，它是DescripcionFragment。

我從Local_vista

TextView desc =(TextView)findViewById(R.id.descripcion_desc); 
     desc.setText(descripcion_local); 

和texfield地處類DescripcionFragment

變化，使我有以下錯誤

Process: com.learn2crack.tuchillan, PID: 21845 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.learn2crack.tuchillan/com.learn2crack.tuchillan.FragmentLocal.Local_vista}: java.lang.NullPointerException 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2198) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257) 
      at android.app.ActivityThread.access$800(ActivityThread.java:139) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:136) 
      at android.app.ActivityThread.main(ActivityThread.java:5086) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.NullPointerException 
      at com.learn2crack.tuchillan.FragmentLocal.Local_vista.onCreate(Local_vista.java:119) 
      at android.app.Activity.performCreate(Activity.java:5248) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2257) 
            at android.app.ActivityThread.access$800(ActivityThread.java:139) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:136) 
            at android.app.ActivityThread.main(ActivityThread.java:5086) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:515) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601) 
            at dalvik.system.NativeStart.main(Native Method) 

Local_Vista

public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     FadingActionBarHelper helper = new FadingActionBarHelper() 
       .actionBarBackground(R.drawable.ab_solid_tucc) 
       .headerLayout(R.layout.header) 
       .contentLayout(R.layout.vista_local); 
     setContentView(helper.createView(this)); 
     helper.initActionBar(this); 
     actionBar = getActionBar(); 
     actionBar.setDisplayHomeAsUpEnabled(true); 

ViewPager vpPager = (ViewPager) findViewById(R.id.vpPager); 
     FragmentPagerAdapter.MyPagerAdapter adapterViewPager = new FragmentPagerAdapter.MyPagerAdapter(getSupportFragmentManager()); 

     vpPager.setAdapter(adapterViewPager); 

     vpPager.setCurrentItem(1); 

     // Attach the page change listener inside the activity 
     vpPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { 

      // This method will be invoked when a new page becomes selected. 
      @Override 
      public void onPageSelected(int position) { 

      } 

      // This method will be invoked when the current page is scrolled 
      @Override 
      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 
       // Code goes here 
      } 

      // Called when the scroll state changes: 
      // SCROLL_STATE_IDLE, SCROLL_STATE_DRAGGING, SCROLL_STATE_SETTLING 
      @Override 
      public void onPageScrollStateChanged(int state) { 
       // Code goes here 
      } 


     }); 


TextView desc =(TextView)findViewById(R.id.descripcion_desc); 
     desc.setText(descripcion_local); 
} 

http://i.imgur.com/xrI2nql.png

DescripcionFragment

public class DescripcionFragment extends Fragment { 

    // newInstance constructor for creating fragment with arguments 
    public static DescripcionFragment newInstance(int page, String title) { 
     DescripcionFragment fragmentsecond = new DescripcionFragment(); 
     Bundle args = new Bundle(); 
     args.putInt("someInt", page); 
     args.putString("someTitle", title); 
     fragmentsecond.setArguments(args); 
     return fragmentsecond; 
    } 

    // Store instance variables based on arguments passed 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     page = getArguments().getInt("someInt", 0); 
     title = getArguments().getString("someTitle"); 
    } 

    // Inflate the view for the fragment based on layout XML 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.v_tab_desc, container, false); 



     return view; 
    } 

Answer 1

你可能這樣做在onCreateView（），因此使用其中U充氣使用被具有充氣視圖的參考充氣的圖。

TextView desc =(TextView)view.findViewById(R.id.descripcion_desc); 
    desc.setText(descripcion_local);