사용자 지정보기에서 자식으로 LinearLayout이 보이지 않습니다.

Question

사용자 지정 레이아웃을 만들고 싶습니다. 나는 간단한 어댑터를 사용한다. 어댑터가 TextView를 만들면 모든 것이 보입니다. 그러나 TextView와 함께 LinearLayout을 자식으로 사용하면 아무 것도 표시되지 않습니다. 이 문제를 어떻게 해결할 수 있습니까?

package com.example.TApp.demo; 

import android.content.Context; 
import android.database.DataSetObserver; 
import android.util.AttributeSet; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AbsListView; 
import android.widget.AdapterView; 

/** 
* Created by ChessMax on 18.07.2014. 
*/ 
public class StudyGrid extends ViewGroup 
{ 
    private StudyGridAdapter mAdapter; 

    public StudyGrid(Context context) { 
     super(context); 
    } 

    public StudyGrid(Context context, AttributeSet attrs) { 
     super(context, attrs); 
    } 

    public StudyGrid(Context context, AttributeSet attrs, int defStyle) { 
     super(context, attrs, defStyle); 
    } 

    @Override 
    protected void onLayout(boolean changed, int l, int t, int r, int b) 
    { 
     int itemWidth = 50; 
     int itemHeight = 50; 

     for(int i=0;i<mAdapter.getCount();i++){ 
      View child = mAdapter.getView(i, null, this); 

      AdapterView.LayoutParams p = (AdapterView.LayoutParams)    child.getLayoutParams(); 
      if (p == null) { 
       p = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 
         ViewGroup.LayoutParams.WRAP_CONTENT, 0); 
      } 

      addViewInLayout(child, i, p, true); 

      child.layout(itemWidth * i, 0, (i+1) * itemWidth, itemHeight); 
     } 
     this.invalidate(); 
    } 

    public void setAdapter(StudyGridAdapter adapter) 
    { 
     mAdapter = adapter; 
     requestLayout(); 
    } 
}  

package com.example.TApp.demo; 

import android.content.Context; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
import com.example.TApp.R; 

import java.util.List; 

/** 
* Created by ChessMax on 18.07.2014. 
*/ 
public class StudyGridAdapter extends ArrayAdapter<StudyData> 
{ 
    private LayoutInflater mInflater; 

    public StudyGridAdapter(Context context, int textViewResourceId) { 
     super(context, textViewResourceId); 
     init(context); 
    } 

    public StudyGridAdapter(Context context, int resource, int textViewResourceId) { 
     super(context, resource, textViewResourceId); 
     init(context); 
    } 

    public StudyGridAdapter(Context context, int textViewResourceId, StudyData[]  objects) { 
     super(context, textViewResourceId, objects); 
     init(context); 
    } 

    public StudyGridAdapter(Context context, int resource, int textViewResourceId,  StudyData[] objects) { 
     super(context, resource, textViewResourceId, objects); 
     init(context); 
    } 

    public StudyGridAdapter(Context context, int textViewResourceId, List<StudyData>  objects) { 
     super(context, textViewResourceId, objects); 
     init(context); 
    } 

    public StudyGridAdapter(Context context, int resource, int textViewResourceId,  List<StudyData> objects) { 
     super(context, resource, textViewResourceId, objects); 
     init(context); 
    } 

    private void init(Context context) { 
     mInflater = (LayoutInflater)  context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
      return createViewFromResource(position, convertView, parent); 
    } 

    private View createViewFromResource(int position, View convertView, ViewGroup  parent) { 
     View view; 
     TextView text = null; 
     int resource = R.layout.study_cell; 

     if (convertView == null) { 
      view = mInflater.inflate(resource, parent, false); 
     } else { 
      view = convertView; 
     } 
     try { 
      if (view instanceof LinearLayout) 
      { 
       LinearLayout layout = (LinearLayout)view; 

       layout.setLayoutParams(new LinearLayout.LayoutParams(
         LinearLayout.LayoutParams.WRAP_CONTENT,  LinearLayout.LayoutParams.WRAP_CONTENT)); 

       int count = layout.getChildCount(); 
       for (int i = 0; i <= count; i++) { 
        View v = layout.getChildAt(i); 
        if (v instanceof TextView) 
        { 
         text = (TextView) v; 
         break; 
        } 
       } 
      } 
      else 
      { 
       text = (TextView) view; 
      } 
     } catch (ClassCastException e) { 
      Log.e("ArrayAdapter", "You must supply a resource ID for a TextView"); 
      throw new IllegalStateException(
        "ArrayAdapter requires the resource ID to be a TextView", e); 
     } 

     if (text != null) 
     { 
      StudyData item = getItem(position); 
      if (item instanceof CharSequence) { 
       text.setText((CharSequence)item); 
      } else { 
       text.setText(item.toString()); 
      } 
     } 

     return view; 
    }  
} 

package com.example.TApp.demo; 

/** 
* Created by ChessMax on 18.07.2014. 
*/ 
public class StudyData 
{ 
    private int num; 

    public StudyData(int num) 
    { 
     this.num = num; 
    } 

    @Override 
    public String toString() 
    { 
     return Integer.toString(num); 
    } 
} 


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

    <TextView xmlns:android="http://schemas.android.com/apk/res/android" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content"> 

    </TextView> 

</LinearLayout> 

package com.example.TApp; 

import android.app.Activity; 
import android.os.Bundle; 
import com.example.TApp.demo.StudyData; 
import com.example.TApp.demo.StudyGrid; 
import com.example.TApp.demo.StudyGridAdapter; 

import java.util.ArrayList; 

/** 
* Created by ChessMax on 18.07.2014. 
*/ 
public class TestActivity extends Activity 
{ 
    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.test); 

     ArrayList<StudyData> list = new ArrayList<StudyData>(); 
     list.add(new StudyData(5)); 
     list.add(new StudyData(6)); 
     list.add(new StudyData(7)); 

     StudyGridAdapter adapter = new StudyGridAdapter(this, R.layout.study_cell,  list); 

     StudyGrid grid = (StudyGrid) findViewById(R.id.studyGrid); 
     grid.setAdapter(adapter); 
    } 
} 

<?xml version="1.0" encoding="utf-8"?> 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
       android:orientation="vertical" 
       android:layout_width="match_parent" 
       android:layout_height="match_parent"> 

    <com.example.TApp.demo.StudyGrid 
     android:id="@+id/studyGrid" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"/> 

</LinearLayout> 

Answer 1

선형 배치 방향을 확인하십시오. 그게 수평이라면, 하나의 팽창 된 뷰만 볼 수 있습니다.

루트 뷰 선형 레이아웃 방향은 수직이어야합니다.