Question

我使用了自定义ArrayAdapter，但未调用getView()方法。但是，我已经使用getCount()方法进行了检查，它返回value > 0. 2在我的情况下。这是我的适配器的代码段。

public class ProfilesSwipableAdapter extends ArrayAdapter<SoundProfile> {
private final ArrayList<SoundProfile> cards;
private final LayoutInflater layoutInflater;
private GoogleApiClient mGoogleApiClient;
private Context mContext;

public ProfilesSwipableAdapter(Context context, int resource, ArrayList<SoundProfile> cards) {
    super(context, 0, cards);
    this.mContext = context;
    this.cards = cards;
    //this.layoutInflater = LayoutInflater.from(context);
    this.layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    if (mGoogleApiClient == null) {
        mGoogleApiClient = new GoogleApiClient.Builder(mContext)
                .addApi(LocationServices.API)
                .build();
    }
    mGoogleApiClient.connect();
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    final SoundProfile card = cards.get(position);
    View view = layoutInflater.inflate(R.layout.list_item_profile, parent, false);

    Glide.with(mContext)
            .load(getMapURLBlack)
            .into(((ImageView) view.findViewById(R.id.map_lite)));

    ((TextView) view.findViewById(R.id.txtProfileName)).setText(card.profileName);

    view.findViewById(R.id.imgEdit).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final LocationManager manager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);

            if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
                buildAlertMessageNoGps();
            } else {
                Intent intent = new Intent(mContext, MainActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                intent.putExtra("name", card.profileName);
                intent.putExtra("key", card.mKey);
                intent.putExtra("lat", card.latitude);
                intent.putExtra("lng", card.longitude);
                mContext.startActivity(intent);
            }
        }
    });

    view.findViewById(R.id.btnDelete).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
            builder.setMessage(mContext.getResources().getString(R.string.prompt_discard_profile))
                    .setCancelable(true)
                    .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                        public void onClick(@SuppressWarnings("unused") final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
                            ArrayList<String> list = new ArrayList<String>();
                            list.add(card.mKey);
                            LocationServices.GeofencingApi.removeGeofences(mGoogleApiClient, list);
                            FirebaseDatabase.getInstance().getReference().child("profiles").child(FirebaseAuth.getInstance().getCurrentUser().getUid()).child(card.mKey).removeValue();
                            EventBus.getDefault().post(new ProfileDeletedEvent(position));
                        }
                    })
                    .setNegativeButton("No", new DialogInterface.OnClickListener() {
                        public void onClick(final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
                            dialog.cancel();
                        }
                    });
            final AlertDialog alert = builder.create();
            alert.show();
        }
    });

    return view;
}

public void buildAlertMessageNoGps() {
    final AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
    builder.setMessage("Your GPS seems to be disabled, do you want to enable it?")
            .setCancelable(true)
            .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                public void onClick(@SuppressWarnings("unused") final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
                    mContext.startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
                }
            })
            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                public void onClick(final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
                    dialog.cancel();
                }
            });
    final AlertDialog alert = builder.create();
    alert.show();
}

@Override
public SoundProfile getItem(int position) {
    return cards.get(position);
}

@Override
public long getItemId(int i) {
    return i;
}

@Override
public int getCount() {
    return cards.size();
}

}

我正在从Fragment初始化此适配器。我已经检查过，我传递的ArrayList也有items > 0和＆amp; adapter.getCount returns > 0也是如此，所以不确定这里发生了什么问题。这是代码片段。

profilesSwipableAdapter = new ProfilesSwipableAdapter(getActivity(), R.layout.list_item_profile, profileArrayList);
            swipeCardView.setAdapter(profilesSwipableAdapter);

对我来说真正令人沮丧的是，如果我通过Activity执行相同的步骤，我会得到正确的结果，即调用适配器getView()。什么可能是错的？

Answer 1

 /Just try to use below code Snippet/

 Put the below code below onCreateView of Fragment

 Activity mactivity;
 MainActivity main_activity;

Note: MainActivity --> is Activity on which Fragment is Attached.


 @Override
 public void onCreate(Bundle savedInstanceState)
 {
    super.onCreate(savedInstanceState);

    mactivity = getActivity();

    main_activity = (MainActivity) mactivity;
 }

 And then try to use "main_activity" instead of getActivity() in
 below code. 

profilesSwipableAdapter = new ProfilesSwipableAdapter(main_activity, R.layout.list_item_profile, profileArrayList);
        swipeCardView.setAdapter(profilesSwipableAdapter);

未调用getView方法，Fragment

1 个答案: