这是我的适配器：
public class PlaceAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<Place> mPlacesList;
private ListItemClickListener mClickListener;
public PlaceAdapter(Context mContext, ArrayList<Place> mCategoryList) {
this.mContext = mContext;
this.mPlacesList = mCategoryList;
// TODO Auto-generated constructor stub
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mPlacesList.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return mPlacesList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
public void setItemClickAndLongClick(ListItemClickListener clickListener) {
mClickListener = clickListener;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder viewHolder;
final int i = position;
if (convertView == null) {
// inflate the GridView item layout
LayoutInflater inflater = LayoutInflater.from(mContext);
convertView = inflater.inflate(R.layout.adapter_places, parent, false);
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mClickListener.onItemClick(i);
}
});
convertView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
// TODO Auto-generated method stub
mClickListener.onItemLongCLick(i);
return false;
}
});
// initialize the view holder
viewHolder = new ViewHolder();
viewHolder.mIcon = (ImageView) convertView.findViewById(R.id.place_icon);
viewHolder.mName = (TextView) convertView.findViewById(R.id.place_name);
viewHolder.mAddress = (TextView) convertView.findViewById(R.id.place_address);
viewHolder.mDistance = (TextView) convertView.findViewById(R.id.place_distance);
convertView.setTag(viewHolder);
} else {
// recycle the already inflated view
viewHolder = (ViewHolder) convertView.getTag();
}
// update the item view
viewHolder.mName.setText(mPlacesList.get(position).getName());
if (mPlacesList.get(position).getAddress() != null) {
Log.e("TEST", mPlacesList.get(position).getAddress());
viewHolder.mAddress.setText(mPlacesList.get(position).getAddress());
}else{
viewHolder.mAddress.setVisibility(View.INVISIBLE);
}
}
public static class ViewHolder {
private ImageView mIcon;
private TextView mName;
private TextView mAddress;
private TextView mDistance;
public ImageView getIcon() {
return mIcon;
}
public TextView getName() {
return mName;
}
public TextView getAddress() {
return mAddress;
}
public TextView getDistance() {
return mAddress;
}
}
}
这是我得到的例外：
01-05 23:37:32.540: E/TEST(2486): 15C4 Thi Sách Street, District 1, Ho Chi Minh City
01-05 23:37:32.548: E/AndroidRuntime(2486): FATAL EXCEPTION: main
01-05 23:37:32.548: E/AndroidRuntime(2486): Process: com.example.finalproject, PID: 2486
01-05 23:37:32.548: E/AndroidRuntime(2486): java.lang.NullPointerException
01-05 23:37:32.548: E/AndroidRuntime(2486): at com.example.finalproject.adapter.PlaceAdapter.getView(PlaceAdapter.java:97)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.AbsListView.obtainView(AbsListView.java:2255)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.ListView.makeAndAddView(ListView.java:1790)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.ListView.fillDown(ListView.java:691)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.ListView.fillFromTop(ListView.java:752)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.ListView.layoutChildren(ListView.java:1616)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.AbsListView.onLayout(AbsListView.java:2087)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.View.layout(View.java:14817)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewGroup.layout(ViewGroup.java:4631)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.View.layout(View.java:14817)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewGroup.layout(ViewGroup.java:4631)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.View.layout(View.java:14817)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewGroup.layout(ViewGroup.java:4631)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.View.layout(View.java:14817)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewGroup.layout(ViewGroup.java:4631)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.View.layout(View.java:14817)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewGroup.layout(ViewGroup.java:4631)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.widget.FrameLayout.onLayout(FrameLayout.java:388)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.View.layout(View.java:14817)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewGroup.layout(ViewGroup.java:4631)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1983)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1740)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5600)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.Choreographer.doFrame(Choreographer.java:544)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.os.Handler.handleCallback(Handler.java:733)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.os.Handler.dispatchMessage(Handler.java:95)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.os.Looper.loop(Looper.java:136)
01-05 23:37:32.548: E/AndroidRuntime(2486): at android.app.ActivityThread.main(ActivityThread.java:5001)
01-05 23:37:32.548: E/AndroidRuntime(2486): at java.lang.reflect.Method.invokeNative(Native Method)
01-05 23:37:32.548: E/AndroidRuntime(2486): at java.lang.reflect.Method.invoke(Method.java:515)
01-05 23:37:32.548: E/AndroidRuntime(2486): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
01-05 23:37:32.548: E/AndroidRuntime(2486): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
01-05 23:37:32.548: E/AndroidRuntime(2486): at dalvik.system.NativeStart.main(Native Method)
正如您所看到的，我从Place对象中成功获取了文本，但我不知道为什么会出现此异常。这真的很奇怪。请帮我！提前谢谢！
答案 0 :(得分：1)
我发现了问题，我在xml布局文件中声明了错误的id。对于这个愚蠢的问题（;¯Д¯）
，大家都很抱歉