我似乎无法摆脱这个错误，这没有任何意义。该错误表明应在名为MainFeedListAdapter.java的文件中声明它，但它是。我也遇到很多错误，但是我认为，如果我解决了所报告的问题，其余的问题将会消失。请帮助我。
编辑！这是文件中的所有代码
import android.content.Context;
import android.content.Intent;
import android.support.annotation.LayoutRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Log;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
import com.nostra13.universalimageloader.core.ImageLoader;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.TimeZone;
import de.hdodenhof.circleimageview.CircleImageView;
import tabian.com.instagramclone2.Home.HomeActivity;
import tabian.com.instagramclone2.Profile.ProfileActivity;
import tabian.com.instagramclone2.R;
import tabian.com.instagramclone2.models.Comment;
import tabian.com.instagramclone2.models.Like;
import tabian.com.instagramclone2.models.Photo;
import tabian.com.instagramclone2.models.User;
import tabian.com.instagramclone2.models.UserAccountSettings;
/**
* Created by User on 9/22/2017.
*/
public class MainFeedListAdapter extends ArrayAdapter<Photo> {
public interface OnLoadMoreItemsListener {
void onLoadMoreItems();
}
OnLoadMoreItemsListener mOnLoadMoreItemsListener;
private static final String TAG = "MainFeedListAdapter";
private LayoutInflater mInflater;
private int mLayoutResource;
private Context mContext;
private DatabaseReference mReference;
private String currentUsername = "";
public MainFeedListAdapter(@NonNull Context context, @LayoutRes int resource, @NonNull List<Photo> objects) {
super(context, resource, objects);
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mLayoutResource = resource;
this.mContext = context;
mReference = FirebaseDatabase.getInstance().getReference();
// for(Photo photo: objects){
// Log.d(TAG, "MainFeedListAdapter: photo id: " + photo.getPhoto_id());
// }
}
static class ViewHolder {
CircleImageView mprofileImage;
String likesString;
TextView username, timeDetla, caption, likes, comments;
SquareImageView image;
ImageView heartRed, heartWhite, comment;
UserAccountSettings settings = new UserAccountSettings();
User user = new User();
StringBuilder users;
String mLikesString;
boolean likeByCurrentUser;
Heart heart;
GestureDetector detector;
Photo photo;
}
@NonNull
@Override
public View getView(final int position, @Nullable View convertView, @NonNull ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(mLayoutResource, parent, false);
holder = new ViewHolder();
holder.username = (TextView) convertView.findViewById(R.id.username);
holder.image = (SquareImageView) convertView.findViewById(R.id.post_image);
holder.heartRed = (ImageView) convertView.findViewById(R.id.image_heart_red);
holder.heartWhite = (ImageView) convertView.findViewById(R.id.image_heart);
holder.comment = (ImageView) convertView.findViewById(R.id.speech_bubble);
holder.likes = (TextView) convertView.findViewById(R.id.image_likes);
holder.comments = (TextView) convertView.findViewById(R.id.image_comments_link);
holder.caption = (TextView) convertView.findViewById(R.id.image_caption);
holder.timeDetla = (TextView) convertView.findViewById(R.id.image_time_posted);
holder.mprofileImage = (CircleImageView) convertView.findViewById(R.id.profile_photo);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.photo = getItem(position);
holder.detector = new GestureDetector(mContext, new GestureListener(holder));
holder.users = new StringBuilder();
holder.heart = new Heart(holder.heartWhite, holder.heartRed);
//get the current users username (need for checking likes string)
getCurrentUsername();
//get likes string
getLikesString(holder);
//set the caption
holder.caption.setText(getItem(position).getCaption());
//set the comment
List<Comment> comments = getItem(position).getComments();
holder.comments.setText("View all " + comments.size() + " comments");
holder.comments.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: loading comment thread for " + getItem(position).getPhoto_id());
((HomeActivity) mContext).onCommentThreadSelected(getItem(position),
mContext.getString(R.string.home_activity));
//going to need to do something else?
((HomeActivity) mContext).hideLayout();
}
});
//set the time it was posted
String timestampDifference = getTimestampDifference(getItem(position));
if (!timestampDifference.equals("0")) {
holder.timeDetla.setText(timestampDifference + " DAYS AGO");
} else {
holder.timeDetla.setText("TODAY");
}
//set the profile image
final ImageLoader imageLoader = ImageLoader.getInstance();
imageLoader.displayImage(getItem(position).getImage_path(), holder.image);
//get the profile image and username
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Query query = reference
.child(mContext.getString(R.string.dbname_user_account_settings))
.orderByChild(mContext.getString(R.string.field_user_id))
.equalTo(getItem(position).getUser_id());
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot singleSnapshot : dataSnapshot.getChildren()) {
// currentUsername = singleSnapshot.getValue(UserAccountSettings.class).getUsername();
Log.d(TAG, "onDataChange: found user: "
+ singleSnapshot.getValue(UserAccountSettings.class).getUsername());
holder.username.setText(singleSnapshot.getValue(UserAccountSettings.class).getUsername());
holder.username.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: navigating to profile of: " +
holder.user.getUsername());
Intent intent = new Intent(mContext, ProfileActivity.class);
intent.putExtra(mContext.getString(R.string.calling_activity),
mContext.getString(R.string.home_activity));
intent.putExtra(mContext.getString(R.string.intent_user), holder.user);
mContext.startActivity(intent);
}
});
imageLoader.displayImage(singleSnapshot.getValue(UserAccountSettings.class).getProfile_photo(),
holder.mprofileImage);
holder.mprofileImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: navigating to profile of: " +
holder.user.getUsername());
Intent intent = new Intent(mContext, ProfileActivity.class);
intent.putExtra(mContext.getString(R.string.calling_activity),
mContext.getString(R.string.home_activity));
intent.putExtra(mContext.getString(R.string.intent_user), holder.user);
mContext.startActivity(intent);
}
});
holder.settings = singleSnapshot.getValue(UserAccountSettings.class);
holder.comment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
((HomeActivity) mContext).onCommentThreadSelected(getItem(position),
mContext.getString(R.string.home_activity));
//another thing?
((HomeActivity) mContext).hideLayout();
}
});
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
//get the user object
Query userQuery = mReference
.child(mContext.getString(R.string.dbname_users))
.orderByChild(mContext.getString(R.string.field_user_id))
.equalTo(getItem(position).getUser_id());
userQuery.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot singleSnapshot : dataSnapshot.getChildren()) {
Log.d(TAG, "onDataChange: found user: " +
singleSnapshot.getValue(User.class).getUsername());
holder.user = singleSnapshot.getValue(User.class);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
if (reachedEndOfList(position)) {
loadMoreData();
}
return convertView;
}
private boolean reachedEndOfList(int position) {
return position == getCount() - 1;
}
private void loadMoreData() {
try {
mOnLoadMoreItemsListener = (OnLoadMoreItemsListener) getContext();
} catch (ClassCastException e) {
Log.e(TAG, "loadMoreData: ClassCastException: " + e.getMessage());
}
try {
mOnLoadMoreItemsListener.onLoadMoreItems();
} catch (NullPointerException e) {
Log.e(TAG, "loadMoreData: ClassCastException: " + e.getMessage());
}
}
public class GestureListener extends GestureDetector.SimpleOnGestureListener {
ViewHolder mHolder;
public GestureListener(ViewHolder holder) {
mHolder = holder;
}
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onDoubleTap(MotionEvent e) {
Log.d(TAG, "onDoubleTap: double tap detected.");
Log.d(TAG, "onDoubleTap: clicked on photo: " + mHolder.photo.getPhoto_id());
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Query query = reference
.child(mContext.getString(R.string.dbname_photos))
.child(mHolder.photo.getPhoto_id())
.child(mContext.getString(R.string.field_likes));
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot singleSnapshot : dataSnapshot.getChildren()) {
String keyID = singleSnapshot.getKey();
//case1: Then user already liked the photo
if (mHolder.likeByCurrentUser
// && singleSnapshot.getValue(Like.class).getUser_id()
//
.equals(FirebaseAuth.getInstance().getCurrentUser().getUid())
) {
mReference.child(mContext.getString(R.string.dbname_photos))
.child(mHolder.photo.getPhoto_id())
.child(mContext.getString(R.string.field_likes))
.child(keyID)
.removeValue();
///
mReference.child(mContext.getString(R.string.dbname_user_photos))
// .child(FirebaseAuth.getInstance().getCurrentUser().getUid())
.child(mHolder.photo.getUser_id())
.child(mHolder.photo.getPhoto_id())
.child(mContext.getString(R.string.field_likes))
.child(keyID)
.removeValue();
mHolder.heart.toggleLike();
getLikesString(mHolder);
}
//case2: The user has not liked the photo
else if (!mHolder.likeByCurrentUser) {
//add new like
addNewLike(mHolder);
break;
}
}
if (!dataSnapshot.exists()) {
//add new like
addNewLike(mHolder);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
return true;
}
}
private void addNewLike(final ViewHolder holder) {
Log.d(TAG, "addNewLike: adding new like");
String newLikeID = mReference.push().getKey();
Like like = new Like();
like.setUser_id(FirebaseAuth.getInstance().getCurrentUser().getUid());
mReference.child(mContext.getString(R.string.dbname_photos))
.child(holder.photo.getPhoto_id())
.child(mContext.getString(R.string.field_likes))
.child(newLikeID)
.setValue(like);
mReference.child(mContext.getString(R.string.dbname_user_photos))
.child(holder.photo.getUser_id())
.child(holder.photo.getPhoto_id())
.child(mContext.getString(R.string.field_likes))
.child(newLikeID)
.setValue(like);
holder.heart.toggleLike();
getLikesString(holder);
}
private void getCurrentUsername() {
Log.d(TAG, "getCurrentUsername: retrieving user account settings");
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Query query = reference
.child(mContext.getString(R.string.dbname_users))
.orderByChild(mContext.getString(R.string.field_user_id))
.equalTo(FirebaseAuth.getInstance().getCurrentUser().getUid());
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot singleSnapshot : dataSnapshot.getChildren()) {
currentUsername = singleSnapshot.getValue(UserAccountSettings.class).getUsername();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void getLikesString(final ViewHolder holder) {
Log.d(TAG, "getLikesString: getting likes string");
Log.d(TAG, "getLikesString: photo id: " + holder.photo.getPhoto_id());
try {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Query query = reference
.child(mContext.getString(R.string.dbname_photos))
.child(holder.photo.getPhoto_id())
.child(mContext.getString(R.string.field_likes));
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
holder.users = new StringBuilder();
for (DataSnapshot singleSnapshot : dataSnapshot.getChildren()) {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Query query = reference
.child(mContext.getString(R.string.dbname_users))
.orderByChild(mContext.getString(R.string.field_user_id))
.equalTo(singleSnapshot.getValue(Like.class).getUser_id());
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot singleSnapshot : dataSnapshot.getChildren()) {
Log.d(TAG, "onDataChange: found like: " +
singleSnapshot.getValue(User.class).getUsername());
holder.users.append(singleSnapshot.getValue(User.class).getUsername());
holder.users.append(",");
}
String[] splitUsers = holder.users.toString().split(",");
if (holder.users.toString().contains(currentUsername + ",")) {//mitch, mitchell.tabian
holder.likeByCurrentUser = true;
} else {
holder.likeByCurrentUser = false;
}
int length = splitUsers.length;
if (length == 1) {
holder.likesString = "Liked by " + splitUsers[0];
} else if (length == 2) {
holder.likesString = "Liked by " + splitUsers[0]
+ " and " + splitUsers[1];
} else if (length == 3) {
holder.likesString = "Liked by " + splitUsers[0]
+ ", " + splitUsers[1]
+ " and " + splitUsers[2];
} else if (length == 4) {
holder.likesString = "Liked by " + splitUsers[0]
+ ", " + splitUsers[1]
+ ", " + splitUsers[2]
+ " and " + splitUsers[3];
} else if (length > 4) {
holder.likesString = "Liked by " + splitUsers[0]
+ ", " + splitUsers[1]
+ ", " + splitUsers[2]
+ " and " + (splitUsers.length - 3) + " others";
}
Log.d(TAG, "onDataChange: likes string: " + holder.likesString);
//setup likes string
setupLikesString(holder, holder.likesString);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
if (!dataSnapshot.exists()) {
holder.likesString = "";
holder.likeByCurrentUser = false;
//setup likes string
setupLikesString(holder, holder.likesString);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
} catch (NullPointerException e) {
Log.e(TAG, "getLikesString: NullPointerException: " + e.getMessage());
holder.likesString = "";
holder.likeByCurrentUser = false;
//setup likes string
setupLikesString(holder, holder.likesString);
}
}
private void setupLikesString(final ViewHolder holder, String likesString) {
Log.d(TAG, "setupLikesString: likes string:" + holder.likesString);
Log.d(TAG, "setupLikesString: photo id: " + holder.photo.getPhoto_id());
if (holder.likeByCurrentUser) {
Log.d(TAG, "setupLikesString: photo is liked by current user");
holder.heartWhite.setVisibility(View.GONE);
holder.heartRed.setVisibility(View.VISIBLE);
holder.heartRed.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return holder.detector.onTouchEvent(event);
}
});
} else {
Log.d(TAG, "setupLikesString: photo is not liked by current user");
holder.heartWhite.setVisibility(View.VISIBLE);
holder.heartRed.setVisibility(View.GONE);
holder.heartWhite.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return holder.detector.onTouchEvent(event);
}
});
}
holder.likes.setText(likesString);
}
/**
* Returns a string representing the number of days ago the post was made
*
* @return
*/
private String getTimestampDifference(Photo photo) {
Log.d(TAG, "getTimestampDifference: getting timestamp difference.");
String difference = "";
Calendar c = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.CANADA);
sdf.setTimeZone(TimeZone.getTimeZone("Canada/Pacific"));//google 'android list of timezones'
Date today = c.getTime();
sdf.format(today);
Date timestamp;
final String photoTimestamp = photo.getDate_created();
try {
timestamp = sdf.parse(photoTimestamp);
difference = String.valueOf(Math.round(((today.getTime() - timestamp.getTime()) / 1000 / 60 / 60 / 24)));
} catch (ParseException e) {
Log.e(TAG, "getTimestampDifference: ParseException: " + e.getMessage());
difference = "0";
}
return difference;
}
}
答案 0 :(得分：0)
您应将放置此适配器的文件.java更改为MainFeedListAdapter.java并重新编译