"Görünüm" bölümündeki fragmana bağlanamıyorum. GetView() çalışmıyor :(

Question

nesneleri bir hata Tab1.java içerdiği olduğunu düşünüyorum oluşturulamaz

Sekme1'e yılında

zamanlayıcı içerir. Buna göre, ben "düzen" görmeye göndermiş.

Tab.java

package com.android.example; 

import android.annotation.SuppressLint; 
import android.os.Bundle; 
import android.os.Handler; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.LinearLayout; 
import android.widget.TextView; 

import java.text.SimpleDateFormat; 
import java.util.Date; 


public class Tab1 extends Fragment { 

    private TextView tvDay, tvHour, tvMinute, tvSecond, tvEvent; 
    private LinearLayout linearLayout1, linearLayout2; 
    private Handler handler; 
    private Runnable runnable; 

    @Override 
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
     View v = inflater.inflate(R.layout.tab_1, container, false); 
     initUI(); 
     countDownStart(); 
     return v; 
    } 


    @SuppressLint("SimpleDateFormat") 
    private void initUI() { 
     linearLayout1 = (LinearLayout) getView().findViewById(R.id.ll1); 
     linearLayout2 = (LinearLayout) getView().findViewById(R.id.ll2); 
     tvDay = (TextView) getView().findViewById(R.id.txtTimerDay); 
     tvHour = (TextView) getView().findViewById(R.id.txtTimerHour); 
     tvMinute = (TextView) getView().findViewById(R.id.txtTimerMinute); 
     tvSecond = (TextView) getView().findViewById(R.id.txtTimerSecond); 
     tvEvent = (TextView) getView().findViewById(R.id.tvevent); 
    } 

    // //////////////COUNT DOWN START///////////////////////// 
    public void countDownStart() { 
     handler = new Handler(); 
     runnable = new Runnable() { 
      @Override 
      public void run() { 
       handler.postDelayed(this, 1000); 
       try { 
        SimpleDateFormat dateFormat = new SimpleDateFormat(
          "yyyy-MM-dd"); 
        // Here Set your Event Date 
        Date futureDate = dateFormat.parse("2016-12-30"); 
        Date currentDate = new Date(); 
        if (!currentDate.after(futureDate)) { 
         long diff = futureDate.getTime() 
           - currentDate.getTime(); 
         long days = diff/(24 * 60 * 60 * 1000); 
         diff -= days * (24 * 60 * 60 * 1000); 
         long hours = diff/(60 * 60 * 1000); 
         diff -= hours * (60 * 60 * 1000); 
         long minutes = diff/(60 * 1000); 
         diff -= minutes * (60 * 1000); 
         long seconds = diff/1000; 
         tvDay.setText("" + String.format("%02d", days)); 
         tvHour.setText("" + String.format("%02d", hours)); 
         tvMinute.setText("" + String.format("%02d", minutes)); 
         tvSecond.setText("" + String.format("%02d", seconds)); 
        } else { 
         linearLayout1.setVisibility(View.VISIBLE); 
         linearLayout2.setVisibility(View.GONE); 
         tvEvent.setText("Android Event Start"); 
         handler.removeCallbacks(runnable); 
         // handler.removeMessages(0); 
        } 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 
     }; 
     handler.postDelayed(runnable, 0); 
    } 

    // //////////////COUNT DOWN END///////////////////////// 
} 

MainActivity.java sonra fragmanları bağlanmak

package com.android.example; 

import android.content.Context; 
import android.support.v4.view.ViewPager; 
import android.os.Bundle; 
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 { 

    // Declaring Your View and Variables 

    Toolbar toolbar; 
    ViewPager pager; 
    ViewPagerAdapter adapter; 
    SlidingTabLayout tabs; 

    int Numboftabs =3; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     CharSequence Titles[]= {getResources().getString(R.string.titles), getResources().getString(R.string.result), getResources().getString(R.string.contacts)}; 


     // Creating The Toolbar and setting it as the Toolbar for the activity 

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


     // Creating The ViewPagerAdapter and Passing Fragment Manager, Titles fot the Tabs and Number Of Tabs. 
     adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs); 

     // Assigning ViewPager View and setting the adapter 
     pager = (ViewPager) findViewById(R.id.pager); 
     pager.setAdapter(adapter); 

     // Assiging the Sliding Tab Layout View 
     tabs = (SlidingTabLayout) findViewById(R.id.tabs); 
     tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width 

     // Setting Custom Color for the Scroll bar indicator of the Tab View 
     tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() { 
      @Override 
      public int getIndicatorColor(int position) { 
       return getResources().getColor(R.color.tabsScrollColor); 
      } 
     }); 

     // Setting the ViewPager For the SlidingTabsLayout 
     tabs.setViewPager(pager); 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu, menu); 
     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(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
} 

tab_1.xml o düzeni

olduğunu

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 

    <LinearLayout 
     android:id="@+id/ll1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="10dp" 
     android:background="@drawable/counter_back" 
     android:gravity="center" 
     android:orientation="horizontal" 
     android:visibility="gone" > 

     <TextView 
      android:id="@+id/tvevent" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:gravity="center_horizontal|center_vertical" 
      android:singleLine="true" 
      android:text="Android Event Start" 
      android:textColor="#fff" 
      android:textSize="24sp" 
      android:textStyle="bold" /> 
    </LinearLayout> 

    <LinearLayout 
     android:id="@+id/ll2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_marginLeft="20dp" 
     android:layout_marginRight="20dp" 
     android:layout_marginTop="10dp" 
     android:background="@drawable/counter_back" 
     android:gravity="center" 
     android:orientation="horizontal" 
     android:visibility="visible" > 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:background="@drawable/counter_back" 
      android:gravity="center" 
      android:orientation="vertical" > 

      <TextView 
       android:id="@+id/txtTimerDay" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_weight="3" 
       android:gravity="center" 
       android:text="00" 
       android:textAppearance="?android:attr/textAppearanceLarge" 
       android:textColor="#fff" /> 

      <TextView 
       android:id="@+id/txt_TimerDay" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_weight="1" 
       android:gravity="center_horizontal" 
       android:text="Days" 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="#fff" /> 
     </LinearLayout> 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:background="@drawable/counter_back" 
      android:gravity="center" 
      android:orientation="vertical" > 

      <TextView 
       android:id="@+id/txtTimerHour" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_weight="3" 
       android:gravity="center" 
       android:text="00" 
       android:textAppearance="?android:attr/textAppearanceLarge" 
       android:textColor="#fff" /> 

      <TextView 
       android:id="@+id/txt_TimerHour" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_weight="1" 
       android:gravity="center_horizontal" 
       android:text="Hour" 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="#fff" /> 
     </LinearLayout> 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:background="@drawable/counter_back" 
      android:gravity="center" 
      android:orientation="vertical" > 

      <TextView 
       android:id="@+id/txtTimerMinute" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_weight="3" 
       android:gravity="center" 
       android:text="00" 
       android:textAppearance="?android:attr/textAppearanceLarge" 
       android:textColor="#fff" /> 

      <TextView 
       android:id="@+id/txt_TimerMinute" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_weight="1" 
       android:gravity="center_horizontal" 
       android:text="Minute" 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="#fff" /> 
     </LinearLayout> 

     <LinearLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_weight="1" 
      android:background="@drawable/counter_back" 
      android:gravity="center" 
      android:orientation="vertical" > 

      <TextView 
       android:id="@+id/txtTimerSecond" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_weight="3" 
       android:gravity="center" 
       android:text="00" 
       android:textAppearance="?android:attr/textAppearanceLarge" 
       android:textColor="#fff" /> 

      <TextView 
       android:id="@+id/txt_TimerSecond" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_weight="1" 
       android:gravity="center_horizontal" 
       android:text="Second" 
       android:textAppearance="?android:attr/textAppearanceSmall" 
       android:textColor="#fff" /> 
     </LinearLayout> 
    </LinearLayout> 

</LinearLayout> 

Gradle hatası: hatası çözemiyorum. Ben bir acemi programcı :)

03-19 18:00:55.154 28193-28193/? E/Zygote: v2 
03-19 18:00:55.154 28193-28193/? I/libpersona: KNOX_SDCARD checking this for 10140 
03-19 18:00:55.154 28193-28193/? I/libpersona: KNOX_SDCARD not a persona 
03-19 18:00:55.154 28193-28193/? I/SELinux: Function: selinux_compare_spd_ram , priority [2] , priority version is VE=SEPF_SM-A300F_5.0.2-1_0026 
03-19 18:00:55.154 28193-28193/? E/SELinux: [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL 
03-19 18:00:55.154 28193-28193/? I/art: Late-enabling -Xcheck:jni 
03-19 18:00:55.174 28193-28193/? D/TimaKeyStoreProvider: in addTimaSignatureService 
03-19 18:00:55.184 28193-28193/? D/TimaKeyStoreProvider: Cannot add TimaSignature Service, License check Failed 
03-19 18:00:55.184 28193-28193/? D/ActivityThread: Added TimaKesytore provider 
03-19 18:00:55.374 28193-28193/com.android.example D/DisplayManager: DisplayManager() 
03-19 18:00:55.714 28193-28240/com.android.example D/OpenGLRenderer: Render dirty regions requested: true 
03-19 18:00:55.784 28193-28193/com.android.example W/FragmentManager: moveToState: Fragment state for Tab2{3edefe8b #0 id=0x7f0c0052} not updated inline; expected state 3 found 2 
03-19 18:00:55.834 28193-28193/com.android.example D/AndroidRuntime: Shutting down VM 
03-19 18:00:55.844 28193-28193/com.android.example E/AndroidRuntime: FATAL EXCEPTION: main 
                       Process: com.android.example, PID: 28193 
                       java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a null object reference 
                        at com.android.example.Tab1.initUI(Tab1.java:36) 
                        at com.android.example.Tab1.onCreateView(Tab1.java:28) 
                        at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974) 
                        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067) 
                        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252) 
                        at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738) 
                        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617) 
                        at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570) 
                        at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:164) 
                        at android.support.v4.view.ViewPager.populate(ViewPager.java:1177) 
                        at android.support.v4.view.ViewPager.populate(ViewPager.java:1025) 
                        at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1545) 
                        at android.view.View.measure(View.java:17826) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5653) 
                        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 
                        at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 
                        at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 
                        at android.view.View.measure(View.java:17826) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5653) 
                        at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
                        at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
                        at android.view.View.measure(View.java:17826) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5653) 
                        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 
                        at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 
                        at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 
                        at android.view.View.measure(View.java:17826) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5653) 
                        at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
                        at android.view.View.measure(View.java:17826) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5653) 
                        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 
                        at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 
                        at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 
                        at android.view.View.measure(View.java:17826) 
                        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5653) 
                        at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
                        at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2748) 
                        at android.view.View.measure(View.java:17826) 
                        at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2030) 
                        at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1174) 
                        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1395) 
                        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1062) 
                        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5873) 
                        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) 
                        at android.view.Choreographer.doCallbacks(Choreographer.java:580) 
                        at android.view.Choreographer.doFrame(Choreographer.java:550) 
                        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) 
                        at android.os.Handler.handleCallback(Handler.java:739) 
                        at android.os.Handler.dispatchMessage(Handler.java:95) 
                        at android.os.Looper.loop(Looper.java:135) 
                        at android.app.ActivityThread.main(ActivityThread.java:5536) 
                        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:1397) 
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.j 
03-19 18:00:57.404 28193-28193/com.android.example I/Process: Sending signal. PID: 28193 SIG: 9 

Answer 1

getView(), OnCreateView() tarafından döndürülen görünümü döndürür;

OnCreateView() öğesi geri gelene kadar null olacaktır.

Yalnızca onCreateView() ifadesi geldiğinde getView() öğesini çağırdığınızdan emin olmanız gerekir. Bunu yapmak için, initUi() ve countdownStart() öğesini onCreateView() döndürdikten sonra çağrılan onViewCreated() içinde taşıyabilirsiniz. Diğer

Answer 2

çünkü ben size() initUI için inflater.inflate() sonucu geçmesi gerektiğini düşünüyorum "yazma" etmeyiniz. Emin değilim, ancak sistem yeni oluşturulmuş görünümünüzü henüz almadığınız için getView() öğesi null döndürdüğünü (yalnızca oluşturduğunuzda, ancak yalnızca onCreateView öğesinden döndükten sonra parçaya bağlı olacaktır).