Как раздуть RelativeLayout из XML

Question

У меня есть очень специфическая задача, чтобы раздуть представление. Честно говоря, я действительно не понимаю, что я должен делать именно так. Единственным методом, который был составлен, было то, что

@Override 
    public View getView(int position, View convertView, ViewGroup parent) { 


     //TODO - Get the current ToDoItem 
     final ToDoItem toDoItem = mItems.get(position); 

     //TODO - Inflate the View for this ToDoItem 
     // from todo_item.xml. 

      RelativeLayout itemLayout = (RelativeLayout)convertView.findViewById(R.id.RelativeLayout1);`` 

Но теперь я получил нулевой указатель. Итак, как я должен правильно раздувать его? XML-код ниже.

02-21 09:21:11.260: E/AndroidRuntime(1506): FATAL EXCEPTION: main 
02-21 09:21:11.260: E/AndroidRuntime(1506): java.lang.NullPointerException 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at course.labs.todomanager.ToDoListAdapter.getView(ToDoListAdapter.java:93) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.widget.HeaderViewListAdapter.getView(HeaderViewListAdapter.java:220) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.widget.AbsListView.obtainView(AbsListView.java:2177) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.widget.ListView.makeAndAddView(ListView.java:1840) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.widget.ListView.fillSpecific(ListView.java:1321) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.widget.ListView.layoutChildren(ListView.java:1633) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.widget.AbsListView.onLayout(AbsListView.java:2012) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.View.layout(View.java:14289) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.ViewGroup.layout(ViewGroup.java:4562) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.View.layout(View.java:14289) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.ViewGroup.layout(ViewGroup.java:4562) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:349) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.View.layout(View.java:14289) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.ViewGroup.layout(ViewGroup.java:4562) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.View.layout(View.java:14289) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.ViewGroup.layout(ViewGroup.java:4562) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1976) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1730) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.Choreographer.doFrame(Choreographer.java:532) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.os.Handler.handleCallback(Handler.java:730) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.os.Handler.dispatchMessage(Handler.java:92) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.os.Looper.loop(Looper.java:137) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at android.app.ActivityThread.main(ActivityThread.java:5103) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at java.lang.reflect.Method.invoke(Method.java:525) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
02-21 09:21:11.260: E/AndroidRuntime(1506):  at dalvik.system.NativeStart.main(Native Method) 

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/RelativeLayout1" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/titleView" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:textAppearance="?android:attr/textAppearanceLarge" > 
    </TextView> 

    <TextView 
     android:id="@+id/StatusLabel" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/statusCheckBox" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentTop="true" 
     android:layout_marginTop="17dp" 
     android:text="@string/done_string" > 
    </TextView> 

    <CheckBox 
     android:id="@+id/statusCheckBox" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentTop="true" 
     android:layout_marginTop="52dp" 
     android:layout_toRightOf="@+id/StatusLabel" > 
    </CheckBox> 

    <TextView 
     android:id="@+id/PriorityLabel" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/statusCheckBox" 
     android:layout_alignTop="@+id/StatusLabel" 
     android:layout_toLeftOf="@+id/priorityView" 
     android:text="@string/priority_string" > 
    </TextView> 

    <TextView 
     android:id="@+id/priorityView" 
     android:layout_width="50dip" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/statusCheckBox" 
     android:layout_alignParentRight="true" 
     android:layout_alignTop="@+id/StatusLabel" > 
    </TextView> 

    <TextView 
     android:id="@+id/DateLabel" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_below="@+id/statusCheckBox" 
     android:text="@string/date_string" > 
    </TextView> 

    <TextView 
     android:id="@+id/dateView" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/DateLabel" 
     android:layout_toRightOf="@+id/DateLabel" > 
    </TextView> 

</RelativeLayout> 

Answer 1

Вам необходимо раздуть макет перед инициализацией просмотров.

convertView = mInflater.inflate(R.layout.yourlayout, parent, false); 

В конструкторе инициализировать mInflater

LayoutInflater mInflater; //declare 

Затем в конструкторе

mInflater = LayoutInflater.from(context); // context pass to the constructor of adapter 

Answer 2

Я предполагаю, что вы пишете пользовательский адаптер:

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    View itemLayout; 
    if (convertView == null) { 
     itemLayout = inflater.inflate(R.layout.fragment_active_orders_item, parent, false); 
    } else { 
     itemLayout = convertView; 
    } 
    //do what you want with itemLayout; 
    return itemLayout; 
} 

Объявить LayoutInflater inflater и инициализировать inflater в адаптере как inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

Answer 3

попробовать это:

RelativeLayout itemLayout = (RelativeLayout) LayoutInflater.from(mContext).inflate(
       R.layout.todo_item, parent, false);