目标：我正在尝试使用 RecyclerView 添加 EditText 字段和 PlaceAutocompleteFragment 字段
注意：PlaceAutoComplete 在添加 RecyclerView 之前工作。此外，EditTexts 在 RecyclerView 中工作正常，但是一旦我尝试将 PlaceAutoComplete 与它一起使用，就会出现 NullPointer 异常
是的，我在stackoverflow上搜索并搜索了这个错误以及AutoPlacecomplete，例如（谷歌位置片段上的Java空指针异常）和（没有找到类“android.view.fragment”）
完全错误：
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.location.places.ui.PlaceAutocompleteFragment.setOnPlaceSelectedListener(com.google.android.gms.location.places.ui.PlaceSelectionListener)' on a null object reference
at com.netgalaxystudios.timeclock.RegisterBusinessActivity.onCreate(RegisterBusinessActivity.java:119)
第 119 行是指： autocompleteFragment.setOnPlaceSelectedListener(new PlaceSelectionListener() {
row_list.xml 中的片段：
<fragment
android:id="@+id/place_autocomplete_fragment"
android:layout_width="0dp"
android:layout_weight="2.55"
android:layout_height="wrap_content"
android:name="com.google.android.gms.location.places.ui.PlaceAutocompleteFragment"
/>
从我的代码中似乎设置了 PlaceAutocomplete，所以不确定它的 NullPointer 是如何工作的（特别是因为它在使用回收器视图之前工作......）？
注册业务活动：
public class RegisterBusinessActivity extends Activity {
//EditText businessLocationET;
//FIREBASE ITEMS
private static FirebaseUser currentUser;
private static final String TAG = "RealtimeDB";
private FirebaseDatabase database;
private DatabaseReference dbRef;
private EditText businessName;
private EditText businessLocation;
//RECYCLERVIEW ITEMS
private Context mContext;
LinearLayout mLinearLayout;
LinearLayout mLinearLayout2;
private RecyclerView mRecyclerView;
private MyAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
int position;
ArrayList<LinearLayout> linearLayoutList = new ArrayList<LinearLayout>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register_businessprofile);
Button addLocationBtn = (Button) findViewById(R.id.addLocationBtn);
// Get the widgets reference from XML layout
mLinearLayout = (LinearLayout) findViewById(R.id.rl);
mLinearLayout2 = (LinearLayout) findViewById(R.id.rl2);
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mContext = getApplicationContext();
linearLayoutList.add(mLinearLayout);
linearLayoutList.add(mLinearLayout2);
// Define a layout for RecyclerView
mLayoutManager = new LinearLayoutManager(mContext, LinearLayoutManager.VERTICAL, false);
mRecyclerView.setLayoutManager(mLayoutManager);
// Initialize a new instance of RecyclerView Adapter instance
mAdapter = new MyAdapter(mContext);
// Set the adapter for RecyclerView
mRecyclerView.setAdapter(mAdapter);
mAdapter.updateDataSet(linearLayoutList);
position = 0;
//FIREBASE FIELDS
businessName = (EditText) findViewById(R.id.nameOfBusinessET);
database = FirebaseDatabase.getInstance();
dbRef = database.getReference("/data");
currentUser =
FirebaseAuth.getInstance().getCurrentUser();
//CODE FOR LOCATION AUTOCOMPLETE
PlaceAutocompleteFragment autocompleteFragment = (PlaceAutocompleteFragment)
getFragmentManager().findFragmentById(R.id.place_autocomplete_fragment);
autocompleteFragment.setOnPlaceSelectedListener(new PlaceSelectionListener() {
@Override
public void onPlaceSelected(Place place) {
// TODO: Get info about the selected place.
Log.i("TAG", "Place: " + place.getName());
//businessLocationET.setText(place.getName());
}
@Override
public void onError(Status status) {
// TODO: Handle the error.
Log.i("TAG", "An error occurred: " + status);
}
});
//ADD EXTRA LOCATIONS
addLocationBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
linearLayoutList.add(mLinearLayout);
linearLayoutList.add(mLinearLayout2);
mAdapter.updateDataSet(linearLayoutList);
}
});
} //END OF ONCREATE
DatabaseReference.CompletionListener completionListener =
new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError,
DatabaseReference databaseReference) {
if (databaseError != null) {
notifyUser(databaseError.getMessage());
}
}
};
private void notifyUser(String message) {
Toast.makeText(RegisterBusinessActivity.this, message,
Toast.LENGTH_SHORT).show();
}
}
我的适配器：
class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
private ArrayList<LinearLayout> mDataSet;
private Context mContext;
private Random mRandom = new Random();
public MyAdapter(Context context){
mContext = context;
}
public static class ViewHolder extends RecyclerView.ViewHolder{
public EditText mTextEditName, mTextEditLocation;
public LinearLayout mRelativeLayout; //from the (Main)Activity XML
public ViewHolder(View v){
super(v);
mTextEditName = (EditText) v.findViewById(R.id.nameOfBusinessET);
//mTextEditLocation = (EditText) v.findViewById(R.id.bizLocation);
mRelativeLayout = (LinearLayout) v.findViewById(R.id.rl);
}
}
void updateDataSet(ArrayList<LinearLayout> myArrayList) {
mDataSet = myArrayList;
notifyDataSetChanged();
}
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
// Create a new View
View v = LayoutInflater.from(mContext).inflate(R.layout.row_layout,parent,false);
ViewHolder vh = new ViewHolder(v);
return vh;
}
//A ViewHolder object stores each of the component views inside the tag field of the Layout, so you can immediately access them without the need to look them up repeatedly.
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
//holder.mTextEditName.setText("");
}
@Override
public int getItemCount(){
return mDataSet.size();
}
}