Übergeben von XML-Objekt an externe Funktion (Android)

Ich möchte ein RelativeLayout, das ich in externen XML erstellt habe, nachdem ich es von einer externen Funktion eingestellt habe, programmatisch (ohne XML include) hinzufügen.Übergeben von XML-Objekt an externe Funktion (Android)

Der Fehler ist der folgende:

FATAL EXCEPTION: main 
Process: ucam, PID: 8950 
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setId(int)' on a null object reference 
at ucam.misc.MessageSetter.setMessageInfo(MessageSetter.java:51) 
at ucam.activities.MainBoard$3$1.onSuccess(MainBoard.java:133) 
at ucam.misc.RequestManager$1.onResponse(RequestManager.java:58) 
at ucam.misc.RequestManager$1.onResponse(RequestManager.java:43)         
at com.android.volley.toolbox.JsonRequest.deliverResponse(JsonRequest.java:65) 
at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99) 
at android.os.Handler.handleCallback(Handler.java:751) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6119) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

Hier ist der Code in mainactivity.java:

private Message m; 
private List<Message> ml; 
private TextView textBox, dateBox, likesBox, textTitle; 
private ImageButton likeButton; 
private LinearLayout content, main; 
private RelativeLayout news; 
private MessageSetter msetter; 
private RequestManager rmanager; 


@Override 
    protected void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main_board); 

     news = (RelativeLayout) findViewById(R.id.news_template);

(...)

@Override 
     public boolean onNavigationItemSelected(@NonNull MenuItem item) { 
      switch (item.getItemId()) { 
       case R.id.navigation_recents: 
        rmanager.getRecentMessages(new VolleyCallbackOp() { 

         public void onSuccess(List<Message> ml) { 
          for (int a = 0; a < ml.size(); a++) { 

           Message j = ml.get(a); 
           msetter = new MessageSetter(MainBoard.this); 
           View v = msetter.setMessageInfo(j, a); 



           }); 

           content.addView(v); 
          } 
         } 
        });

Hier ist die externe Setter-Klasse:

public class MessageSetter { 
    public Activity mainBoard; 
    private TextView textBox, dateBox, likesBox, textTitle; 
    private ImageButton likeButton; 
    private RelativeLayout news; 



    public MessageSetter(Activity mainBoard) { 
     this.mainBoard = mainBoard; 
     this.news = (RelativeLayout) this.mainBoard.findViewById(R.id.news_template); 
     this.textBox = (TextView) this.mainBoard.findViewById(R.id.text_box); 
     this.dateBox = (TextView) this.mainBoard.findViewById(R.id.date_box); 
     this.likesBox = (TextView) this.mainBoard.findViewById(R.id.likes_box); 
     this.textTitle = (TextView) this.mainBoard.findViewById(R.id.text_title); 

    } 

    public View setMessageInfo(Message j, int a) { 
     int idDB = a; 
     int idLB = a; 
     int idLBT = a; 
     textTitle.setId(a); 
     textTitle.setText(j.getTitle()); 
     textBox.setText(j.getContent()); 
     textBox.setId((j.getId())); 
     dateBox.setText(String.valueOf(j.getDate())); 
     dateBox.setId(idDB); 
     likesBox.setText(String.valueOf(j.getLikesCount())); 
     likesBox.setId(idLB); 

return news; 
    }

0 Diese

ist die mainactivity Layout:

<?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:context=".activities.MainBoard" 
    tools:openDrawer="start"> 



<ScrollView 
    android:id="@+id/main_scroll" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content"> 

    <LinearLayout 

     android:id="@+id/main_linear" 
     android:orientation="vertical" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
     <include layout="@layout/app_bar_main_board" /> 

     <LinearLayout 
      android:id="@+id/main_content" 
      android:orientation="vertical" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content"> 

     </LinearLayout> 


    </LinearLayout> 

</ScrollView> 

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

     <android.support.design.widget.BottomNavigationView 
      android:id="@+id/navigation" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_gravity="bottom" 
      android:background="?android:attr/windowBackground" 
      app:menu="@menu/navigation" /> 

     <android.support.design.widget.FloatingActionButton 
      android:id="@+id/fab" 
      android:layout_width="wrap_content" 
      android:layout_height="72dp" 
      android:layout_gravity="center|end" 
      android:layout_margin="@dimen/fab_margin" 
      app:srcCompat="@drawable/ic_comment_black_24dp" /> 

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

    <android.support.design.widget.NavigationView 

     android:id="@+id/nav_view" 
     android:layout_width="wrap_content" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     app:headerLayout="@layout/nav_header_main_board" 
     app:menu="@menu/activity_main_board_drawer" > 

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


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

Und schließlich ist dies die XML externen Layout-Datei Ich möchte gesetzt und sind in der Aktivität:

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_marginTop="3dp" 
    android:layout_marginRight="3dp" 
    android:layout_marginLeft="3dp" 
    android:id="@+id/news_template" 
    android:layout_width="match_parent" 
    android:layout_height="120dp" 
    android:background="#5A8FF2" 
    android:orientation="horizontal" 
    tools:context=".activities.MainBoard"> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:padding="2dp" 
     android:id="@+id/text_title" 
     android:textColor="#000000" 
     android:textStyle="normal" 
     android:textSize="14dp" 
     android:gravity="center" 
     android:layout_alignParentTop="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" /> 
    <TextView 
     android:id="@+id/text_box" 
     android:textColor="#000000" 
     android:textStyle="normal" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textSize="14dp" 
     android:padding="10dp" 
     android:layout_above="@+id/news_answers" 
     android:layout_below="@+id/text_title" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_alignParentRight="true" 
     android:layout_alignParentEnd="true"> 
    </TextView> 

    <LinearLayout 
     android:id="@+id/news_answers" 
     android:layout_width="20dp" 
     android:layout_height="20dp" 
     android:layout_alignParentBottom="true" 
     android:layout_alignParentLeft="true" 
     android:layout_marginBottom="15dp" 
     android:layout_marginLeft="25dp" 
     android:orientation="horizontal"> 

    </LinearLayout> 

    <LinearLayout 
     android:id="@+id/news_likes" 
     android:layout_marginRight="8dp" 
     android:layout_width="120dp" 
     android:layout_height="match_parent" 
     android:layout_alignParentBottom="true" 
     android:layout_alignTop="@+id/imageView2" 
     android:gravity="right" 
     android:orientation="vertical" 
     android:weightSum="2" 
     android:layout_alignParentRight="true" 
     android:layout_alignParentEnd="true"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:layout_height="0dp" 
      android:layout_weight="1" 
      android:textSize="12dp" 
      android:text="Likes" /> 

     <TextView 
      android:id="@+id/likes_box" 
      android:textSize="12dp" 
      android:layout_width="wrap_content" 
      android:layout_height="0dp" 
      android:layout_weight="1" /> 
    </LinearLayout> 

    <ImageButton 
     android:id="@+id/like_button" 
     android:layout_width="26dp" 
     android:layout_height="26dp" 
     android:layout_alignParentBottom="true" 
     android:layout_centerHorizontal="true" 
     android:background="@drawable/ic_mood_black_24dp" 
     android:text="Like" /> 

    <LinearLayout 
     android:id="@+id/imageView2" 
     android:layout_marginLeft="8dp" 
     android:layout_width="120dp" 
     android:layout_height="match_parent" 
     android:layout_alignParentBottom="true" 
     android:layout_alignTop="@+id/news_answers" 
     android:orientation="vertical" 
     android:weightSum="2"> 

     <TextView 
      android:layout_width="wrap_content" 
      android:textSize="12dp" 
      android:layout_height="0dp" 
      android:layout_weight="1" 
      android:text="Date" /> 

     <TextView 
      android:id="@+id/date_box" 
      android:textSize="12dp" 
      android:layout_width="wrap_content" 
      android:layout_height="0dp" 
      android:layout_weight="1" /> 
    </LinearLayout> 

</RelativeLayout>

Ich verstehe nicht, warum die SetFunction gibt eine Nullreferenz zurück.

Quelle

2017-05-18 firstofthebadones

Ich denke, weil die RelativeLayout nicht in Ihrem mainActivity Layout ist, wirft es die Null-Objekt Ausnahme. –

Der Grund dafür ist, dass Sie findViewById() falsch verwenden.

this.news = (RelativeLayout) this.mainBoard.findViewById(R.id.news_template); 
this.textBox = (TextView) this.mainBoard.findViewById(R.id.text_box); 
this.dateBox = (TextView) this.mainBoard.findViewById(R.id.date_box); 
this.likesBox = (TextView) this.mainBoard.findViewById(R.id.likes_box); 
this.textTitle = (TextView) this.mainBoard.findViewById(R.id.text_title);

Alle diese Methoden Anrufe Rückkehr null, da diese Ansichten nicht in Ihrer Tätigkeit Layout befindet - R.layout.activity_main_board die Sie hier einstellen setContentView(R.layout.activity_main_board);

Stattdessen sollten Sie Ihre XML-Layout aufblasen verwenden sepertly und ihnen die Ansichten finden von diesem XML. Kasse dieser Code:

//get the inflater from your activity 
LayoutInflater inflater = mainBoard.getLayoutInflater(); 
//get the root view, this is the view that should be the parent of the new inflated view 
View root = this.mainBoard.findViewById(R.id.main_content); 
//false indicates that the new inflated view wont be attatched to its parent. Use true if this is not your wanted behavior 
this.news = (RelativeLayout) = inflater.inflate(R.layout.news_template, (ViewGroup) root,false); 
//find the views from the inflated xml 
this.textBox = (TextView) news.findViewById(R.id.text_box); 
this.dateBox = (TextView) news.findViewById(R.id.date_box); 
this.likesBox = (TextView) news.findViewById(R.id.likes_box); 
this.textTitle = (TextView) news.findViewById(R.id.text_title);

Quelle

2017-05-18 18:34:32

Ich werde das versuchen und ich werde Sie wissen lassen..danke in Beratung;) – firstofthebadones

Lassen Sie mich wissen, wenn dies nicht geholfen hat: D –

ok es funktioniert perfekt! vielen Dank!! (nur ein Casting notwendig in: this.news = (RelativeLayout) inflater.inflate (R.layout.news_template, (ViewGroup) root, false); – firstofthebadones

Übergeben von XML-Objekt an externe Funktion (Android)

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