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내가 정의 listadapter 할 tryging하고
를 작동하지 않는 경우, 여기 ... 사용자 정의 listadapter 클래스는 NullPointerException 제공하지만 난 내가 잘못하고 있어요 몰랐 않습니다사용자 지정 ListAdapter
public class BusinessListAdapter extends BaseAdapter {
private Context mContext;
private List<Businesses> mBusinessesList = null;
private LayoutInflater mLayoutInflator = null;
private ViewHolder mViewHolder;
private static class ViewHolder{
TextView mBName;
TextView mBAddress;
TextView mBDealsCount;
TextView mBDistance;
}
public BusinessListAdapter(Context mContext,
List<Businesses> mBusinessesList){
super();
this.mContext = mContext;
this.mBusinessesList = mBusinessesList;
this.mLayoutInflator = LayoutInflater.from(mContext);
}
@Override
public int getCount() {
return this.mBusinessesList.size();
}
@Override
public Businesses getItem(int position) {
return mBusinessesList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
mLayoutInflator = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = mLayoutInflator.inflate(R.layout.layout_list_item, null);
mViewHolder = new ViewHolder();
mViewHolder.mBName = (TextView) convertView.
findViewById(R.id.tvListItemBName);
mViewHolder.mBName = (TextView) convertView.
findViewById(R.id.tvListItemBAddress);
mViewHolder.mBName = (TextView) convertView.
findViewById(R.id.tvListItemBDealsCount);
mViewHolder.mBName = (TextView) convertView.
findViewById(R.id.tvListItemBDistance);
convertView.setTag(mViewHolder);
}else{
mViewHolder = (ViewHolder) convertView.getTag();
}
Businesses business = mBusinessesList.get(position);
mViewHolder.mBName.setText(business.getbName());
mViewHolder.mBAddress.setText(business.getbAddress());
mViewHolder.mBDealsCount.setText(business.getDealCount());
mViewHolder.mBDistance.setText(business.getbDistance());
return convertView;
}
}
이 내 목록보기 활동 :
public class BusinessListActivity extends ListActivity implements OnItemClickListener{
private ArrayList<Businesses> businessesList;
private BusinessListAdapter mBusinessListAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_bussinesses_list);
businessesList = new ArrayList<Businesses>();
businessesList.add(new Businesses("ABC","ABC ADDRESS","5 Deals","2Km"));
businessesList.add(new Businesses("ABC","ABC ADDRESS","5 Deals","2Km"));
businessesList.add(new Businesses("ABC","ABC ADDRESS","5 Deals","2Km"));
mBusinessListAdapter = new BusinessListAdapter(BusinessListActivity.this,
businessesList);
setListAdapter(mBusinessListAdapter);
getListView().setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
Businesses mBusiness = businessesList.get(position);
Intent intent = new Intent(BusinessListActivity.this, BusinessDealsActivity.class);
// intent.putExtra("mBusiness", mBusiness);
startActivity(intent);
}
}
여기 내 logcat입니다. 이 같이 할 이유는 무엇
05-13 12:21:22.080: E/AndroidRuntime(6143): FATAL EXCEPTION: main
05-13 12:21:22.080: E/AndroidRuntime(6143): java.lang.NullPointerException
05-13 12:21:22.080: E/AndroidRuntime(6143): at com.faisalahsan.discountcloud.listviewadapters.BusinessListAdapter.getView(BusinessListAdapter.java:78)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.AbsListView.obtainView(AbsListView.java:2041)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.ListView.measureHeightOfChildren(ListView.java:1244)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.ListView.onMeasure(ListView.java:1155)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.View.measure(View.java:12758)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.View.measure(View.java:12758)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.View.measure(View.java:12758)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.LinearLayout.measureVertical(LinearLayout.java:812)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.View.measure(View.java:12758)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
05-13 12:21:22.080: E/AndroidRuntime(6143): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2092)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.View.measure(View.java:12758)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1064)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2445)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.os.Handler.dispatchMessage(Handler.java:99)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.os.Looper.loop(Looper.java:137)
05-13 12:21:22.080: E/AndroidRuntime(6143): at android.app.ActivityThread.main(ActivityThread.java:4424)
05-13 12:21:22.080: E/AndroidRuntime(6143): at java.lang.reflect.Method.invokeNative(Native Method)
05-13 12:21:22.080: E/AndroidRuntime(6143): at java.lang.reflect.Method.invoke(Method.java:511)
05-13 12:21:22.080: E/AndroidRuntime(6143): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
05-13 12:21:22.080: E/AndroidRuntime(6143): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
05-13 12:21:22.080: E/AndroidRuntime(6143): at dalvik.system.NativeStart.main(Native Method)
nullpointer 예외가 발생합니까? logcat 게시 –
@ madhu 나는 logcat으로 내 질문을 업데이트했습니다. – FAISAL