Fatal编程技术网
  • java/
  • 我有一个错误：“；Can'；t将java.lang.String类型的对象转换为com.flashpub.flash.imageSection类型；我不知道'；我不知道为什么

我有一个错误：“；Can'；t将java.lang.String类型的对象转换为com.flashpub.flash.imageSection类型；我不知道'；我不知道为什么

java android firebase

我有一个错误：“；Can'；t将java.lang.String类型的对象转换为com.flashpub.flash.imageSection类型；我不知道'；我不知道为什么,java,android,firebase,firebase-realtime-database,Java,Android,Firebase,Firebase Realtime Database,我已经创建了一个listView，由于我正在打开其中一个项目，应用程序需要获取应用程序的所有图像，但它不工作，我无法理解为什么会显示此错误。 谢谢你的帮助 这是我在Firebase上的模型： imageSection.java package com.flashpub.flash; import java.util.List; public class imageSection { String imageUrl; public imageSection(){

我已经创建了一个listView，由于我正在打开其中一个项目，应用程序需要获取应用程序的所有图像，但它不工作，我无法理解为什么会显示此错误。 谢谢你的帮助

这是我在Firebase上的模型：

imageSection.java

package com.flashpub.flash;

import java.util.List;

public class imageSection {

    String imageUrl;

    public imageSection(){

    }

    public imageSection(String imageUrl) {
        this.imageUrl = imageUrl;
    }

    public String getImageUrl() {
        return imageUrl;
    }
}

package com.flashpub.flash;

import java.util.List;

public class chooseSection {

    String sectionn;

    public chooseSection() {

    }

    public chooseSection(String sectionn) {
        this.sectionn = sectionn;
    }

    public String getSectionn() {
        return sectionn;
    }
}

public class ChooseSectionActivity extends AppCompatActivity {

ListView listView;
FirebaseListAdapter<chooseSection> adapter;
chooseSection sectionChosse;

//private HashMap<Integer, String> allItemsList = new HashMap<Integer, String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_choose_section);

    listView = findViewById(R.id.listView);

    FirebaseDatabase.getInstance().setPersistenceEnabled(true);

    FirebaseDatabase database = FirebaseDatabase.getInstance();
    DatabaseReference myRef = database.getReference();
    myRef.keepSynced(true);

    Query query = FirebaseDatabase.getInstance().getReference().child("Sections");
    Log.i("salut", query.toString());
    FirebaseListOptions<chooseSection> options = new FirebaseListOptions.Builder<chooseSection>()
            .setLayout(R.layout.section_list)
            .setQuery(query,chooseSection.class)
            .build();
    adapter =  new FirebaseListAdapter<chooseSection>(options) {
        @Override
        protected void populateView(@NonNull View view, @NonNull chooseSection model, int position) {

            TextView sectionView = (TextView) view.findViewById(R.id.sectionView);
            sectionView.setText(model.getSectionn());


            chooseSection lu = sectionChosse;
            //String LatLng = lu.getLocationUserLatitude() + "," + lu.getLocationUserLongitude();
            //allItemsList.put(position, model.getSectionn());
        }

    };
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            //String item = allItemsList.get(position);
            Intent intent = new Intent(ChooseSectionActivity.this, PubsSectionActivity.class);
            //intent.putExtra("key", item);
            startActivity(intent);
        }
    });
    listView.setAdapter(adapter);
}

@Override
protected void onStart() {
    super.onStart();
    adapter.startListening();
}

@Override
protected void onStop() {
    super.onStop();
    adapter.stopListening();
}

public class PubsSectionActivity extends AppCompatActivity {
ViewFlipper viewFlipp;
private DatabaseReference databaseReference;
private List<imageSection> slideLists;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pubs_section);

    viewFlipp = findViewById(R.id.viewFlipper);

    databaseReference = FirebaseDatabase.getInstance().getReference();
    slideLists = new ArrayList<>();
}

@Override
protected void onStart() {
    super.onStart();
    usingFirebaseDatabase();
}

private void usingFirebaseDatabase() {
    String lolipop = "Coiffeur";
    databaseReference.child("Sections/Restaurant")
            .addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    if (dataSnapshot.exists()) {
                        slideLists.clear();
                        for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                            imageSection model = snapshot.getValue(imageSection.class);
                            slideLists.add(model);
                        }

                        Toast.makeText(PubsSectionActivity.this, "All data fetched", Toast.LENGTH_SHORT).show();
                        usingFirebaseImages(slideLists);
                    } else {
                        Toast.makeText(PubsSectionActivity.this, "No images in firebase", Toast.LENGTH_SHORT).show();
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {
                    Toast.makeText(PubsSectionActivity.this, "NO images found \n" + databaseError.getMessage(), Toast.LENGTH_SHORT).show();
                }
            });
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

}
private void usingFirebaseImages(List<imageSection> slideLists) {
    for (int i = 0; i < slideLists.size(); i++) {
        String downloadImageUrl = slideLists.get(i).getImageUrl();
        Toast.makeText(this, downloadImageUrl, Toast.LENGTH_LONG).show();
        ImageView imageView = new ImageView(this);
        Picasso.get().load(downloadImageUrl).fit().centerCrop().into(imageView);
        viewFlipp.addView(imageView);
        viewFlipp.setInAnimation(this, android.R.anim.slide_in_left);
        viewFlipp.setOutAnimation(this, android.R.anim.slide_out_right);
    }
}
选择Section.java

package com.flashpub.flash;

import java.util.List;

public class imageSection {

    String imageUrl;

    public imageSection(){

    }

    public imageSection(String imageUrl) {
        this.imageUrl = imageUrl;
    }

    public String getImageUrl() {
        return imageUrl;
    }
}

package com.flashpub.flash;

import java.util.List;

public class chooseSection {

    String sectionn;

    public chooseSection() {

    }

    public chooseSection(String sectionn) {
        this.sectionn = sectionn;
    }

    public String getSectionn() {
        return sectionn;
    }
}

public class ChooseSectionActivity extends AppCompatActivity {

ListView listView;
FirebaseListAdapter<chooseSection> adapter;
chooseSection sectionChosse;

//private HashMap<Integer, String> allItemsList = new HashMap<Integer, String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_choose_section);

    listView = findViewById(R.id.listView);

    FirebaseDatabase.getInstance().setPersistenceEnabled(true);

    FirebaseDatabase database = FirebaseDatabase.getInstance();
    DatabaseReference myRef = database.getReference();
    myRef.keepSynced(true);

    Query query = FirebaseDatabase.getInstance().getReference().child("Sections");
    Log.i("salut", query.toString());
    FirebaseListOptions<chooseSection> options = new FirebaseListOptions.Builder<chooseSection>()
            .setLayout(R.layout.section_list)
            .setQuery(query,chooseSection.class)
            .build();
    adapter =  new FirebaseListAdapter<chooseSection>(options) {
        @Override
        protected void populateView(@NonNull View view, @NonNull chooseSection model, int position) {

            TextView sectionView = (TextView) view.findViewById(R.id.sectionView);
            sectionView.setText(model.getSectionn());


            chooseSection lu = sectionChosse;
            //String LatLng = lu.getLocationUserLatitude() + "," + lu.getLocationUserLongitude();
            //allItemsList.put(position, model.getSectionn());
        }

    };
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            //String item = allItemsList.get(position);
            Intent intent = new Intent(ChooseSectionActivity.this, PubsSectionActivity.class);
            //intent.putExtra("key", item);
            startActivity(intent);
        }
    });
    listView.setAdapter(adapter);
}

@Override
protected void onStart() {
    super.onStart();
    adapter.startListening();
}

@Override
protected void onStop() {
    super.onStop();
    adapter.stopListening();
}

public class PubsSectionActivity extends AppCompatActivity {
ViewFlipper viewFlipp;
private DatabaseReference databaseReference;
private List<imageSection> slideLists;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pubs_section);

    viewFlipp = findViewById(R.id.viewFlipper);

    databaseReference = FirebaseDatabase.getInstance().getReference();
    slideLists = new ArrayList<>();
}

@Override
protected void onStart() {
    super.onStart();
    usingFirebaseDatabase();
}

private void usingFirebaseDatabase() {
    String lolipop = "Coiffeur";
    databaseReference.child("Sections/Restaurant")
            .addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    if (dataSnapshot.exists()) {
                        slideLists.clear();
                        for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                            imageSection model = snapshot.getValue(imageSection.class);
                            slideLists.add(model);
                        }

                        Toast.makeText(PubsSectionActivity.this, "All data fetched", Toast.LENGTH_SHORT).show();
                        usingFirebaseImages(slideLists);
                    } else {
                        Toast.makeText(PubsSectionActivity.this, "No images in firebase", Toast.LENGTH_SHORT).show();
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {
                    Toast.makeText(PubsSectionActivity.this, "NO images found \n" + databaseError.getMessage(), Toast.LENGTH_SHORT).show();
                }
            });
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

}
private void usingFirebaseImages(List<imageSection> slideLists) {
    for (int i = 0; i < slideLists.size(); i++) {
        String downloadImageUrl = slideLists.get(i).getImageUrl();
        Toast.makeText(this, downloadImageUrl, Toast.LENGTH_LONG).show();
        ImageView imageView = new ImageView(this);
        Picasso.get().load(downloadImageUrl).fit().centerCrop().into(imageView);
        viewFlipp.addView(imageView);
        viewFlipp.setInAnimation(this, android.R.anim.slide_in_left);
        viewFlipp.setOutAnimation(this, android.R.anim.slide_out_right);
    }
}
选择SectionActivity.java

package com.flashpub.flash;

import java.util.List;

public class imageSection {

    String imageUrl;

    public imageSection(){

    }

    public imageSection(String imageUrl) {
        this.imageUrl = imageUrl;
    }

    public String getImageUrl() {
        return imageUrl;
    }
}

package com.flashpub.flash;

import java.util.List;

public class chooseSection {

    String sectionn;

    public chooseSection() {

    }

    public chooseSection(String sectionn) {
        this.sectionn = sectionn;
    }

    public String getSectionn() {
        return sectionn;
    }
}

public class ChooseSectionActivity extends AppCompatActivity {

ListView listView;
FirebaseListAdapter<chooseSection> adapter;
chooseSection sectionChosse;

//private HashMap<Integer, String> allItemsList = new HashMap<Integer, String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_choose_section);

    listView = findViewById(R.id.listView);

    FirebaseDatabase.getInstance().setPersistenceEnabled(true);

    FirebaseDatabase database = FirebaseDatabase.getInstance();
    DatabaseReference myRef = database.getReference();
    myRef.keepSynced(true);

    Query query = FirebaseDatabase.getInstance().getReference().child("Sections");
    Log.i("salut", query.toString());
    FirebaseListOptions<chooseSection> options = new FirebaseListOptions.Builder<chooseSection>()
            .setLayout(R.layout.section_list)
            .setQuery(query,chooseSection.class)
            .build();
    adapter =  new FirebaseListAdapter<chooseSection>(options) {
        @Override
        protected void populateView(@NonNull View view, @NonNull chooseSection model, int position) {

            TextView sectionView = (TextView) view.findViewById(R.id.sectionView);
            sectionView.setText(model.getSectionn());


            chooseSection lu = sectionChosse;
            //String LatLng = lu.getLocationUserLatitude() + "," + lu.getLocationUserLongitude();
            //allItemsList.put(position, model.getSectionn());
        }

    };
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            //String item = allItemsList.get(position);
            Intent intent = new Intent(ChooseSectionActivity.this, PubsSectionActivity.class);
            //intent.putExtra("key", item);
            startActivity(intent);
        }
    });
    listView.setAdapter(adapter);
}

@Override
protected void onStart() {
    super.onStart();
    adapter.startListening();
}

@Override
protected void onStop() {
    super.onStop();
    adapter.stopListening();
}

public class PubsSectionActivity extends AppCompatActivity {
ViewFlipper viewFlipp;
private DatabaseReference databaseReference;
private List<imageSection> slideLists;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pubs_section);

    viewFlipp = findViewById(R.id.viewFlipper);

    databaseReference = FirebaseDatabase.getInstance().getReference();
    slideLists = new ArrayList<>();
}

@Override
protected void onStart() {
    super.onStart();
    usingFirebaseDatabase();
}

private void usingFirebaseDatabase() {
    String lolipop = "Coiffeur";
    databaseReference.child("Sections/Restaurant")
            .addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    if (dataSnapshot.exists()) {
                        slideLists.clear();
                        for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                            imageSection model = snapshot.getValue(imageSection.class);
                            slideLists.add(model);
                        }

                        Toast.makeText(PubsSectionActivity.this, "All data fetched", Toast.LENGTH_SHORT).show();
                        usingFirebaseImages(slideLists);
                    } else {
                        Toast.makeText(PubsSectionActivity.this, "No images in firebase", Toast.LENGTH_SHORT).show();
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {
                    Toast.makeText(PubsSectionActivity.this, "NO images found \n" + databaseError.getMessage(), Toast.LENGTH_SHORT).show();
                }
            });
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

}
private void usingFirebaseImages(List<imageSection> slideLists) {
    for (int i = 0; i < slideLists.size(); i++) {
        String downloadImageUrl = slideLists.get(i).getImageUrl();
        Toast.makeText(this, downloadImageUrl, Toast.LENGTH_LONG).show();
        ImageView imageView = new ImageView(this);
        Picasso.get().load(downloadImageUrl).fit().centerCrop().into(imageView);
        viewFlipp.addView(imageView);
        viewFlipp.setInAnimation(this, android.R.anim.slide_in_left);
        viewFlipp.setOutAnimation(this, android.R.anim.slide_out_right);
    }
}

公共类ChooseSectionActivity扩展了AppCompatActivity{
列表视图列表视图；
FirebaseListAdapter；
选择切面切面；
//private HashMap allItemsList=new HashMap（）；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u choose\u部分）；
listView=findViewById（R.id.listView）；
FirebaseDatabase.getInstance（）.setPersistenceEnabled（true）；
FirebaseDatabase=FirebaseDatabase.getInstance（）；
DatabaseReference myRef=database.getReference（）；
myRef.keepSynced（真）；
Query Query=FirebaseDatabase.getInstance（）.getReference（）.child（“节”）；
Log.i（“sallt”，query.toString（））；
FirebaseListOptions=new FirebaseListOptions.Builder（）
.setLayout（右布局，截面图列表）
.setQuery（查询，选择Section.class）
.build（）；
适配器=新FirebaseListAdapter（选项）{
@凌驾
受保护的void populateView（@NonNull视图，@NonNull选择器截面模型，int位置）{
TextView sectionView=（TextView）view.findViewById（R.id.sectionView）；
sectionView.setText（model.getSectionn（））；
选择SECTION lu=SECTIONCHOSE；
//字符串LatLng=lu.getLocationUserLatitude（）+“，“+lu.getLocationUserLatitude（）；
//allItemsList.put（位置，model.getSectionn（））；
}
};
setOnItemClickListener（新的AdapterView.OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父对象、视图、整型位置、长id）{
//String item=allItemsList.get（位置）；
意向意向=新意向（选择SectionActivity.this、PubsSectionActivity.class）；
//意向。额外（“关键”，项目）；
星触觉（意向）；
}
});
setAdapter（适配器）；
}
@凌驾
受保护的void onStart（）{
super.onStart（）；
adapter.startListening（）；
}
@凌驾
受保护的void onStop（）{
super.onStop（）；
adapter.stopListening（）；
}
}

PubsSectionActivity.java

package com.flashpub.flash;

import java.util.List;

public class imageSection {

    String imageUrl;

    public imageSection(){

    }

    public imageSection(String imageUrl) {
        this.imageUrl = imageUrl;
    }

    public String getImageUrl() {
        return imageUrl;
    }
}

package com.flashpub.flash;

import java.util.List;

public class chooseSection {

    String sectionn;

    public chooseSection() {

    }

    public chooseSection(String sectionn) {
        this.sectionn = sectionn;
    }

    public String getSectionn() {
        return sectionn;
    }
}

public class ChooseSectionActivity extends AppCompatActivity {

ListView listView;
FirebaseListAdapter<chooseSection> adapter;
chooseSection sectionChosse;

//private HashMap<Integer, String> allItemsList = new HashMap<Integer, String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_choose_section);

    listView = findViewById(R.id.listView);

    FirebaseDatabase.getInstance().setPersistenceEnabled(true);

    FirebaseDatabase database = FirebaseDatabase.getInstance();
    DatabaseReference myRef = database.getReference();
    myRef.keepSynced(true);

    Query query = FirebaseDatabase.getInstance().getReference().child("Sections");
    Log.i("salut", query.toString());
    FirebaseListOptions<chooseSection> options = new FirebaseListOptions.Builder<chooseSection>()
            .setLayout(R.layout.section_list)
            .setQuery(query,chooseSection.class)
            .build();
    adapter =  new FirebaseListAdapter<chooseSection>(options) {
        @Override
        protected void populateView(@NonNull View view, @NonNull chooseSection model, int position) {

            TextView sectionView = (TextView) view.findViewById(R.id.sectionView);
            sectionView.setText(model.getSectionn());


            chooseSection lu = sectionChosse;
            //String LatLng = lu.getLocationUserLatitude() + "," + lu.getLocationUserLongitude();
            //allItemsList.put(position, model.getSectionn());
        }

    };
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            //String item = allItemsList.get(position);
            Intent intent = new Intent(ChooseSectionActivity.this, PubsSectionActivity.class);
            //intent.putExtra("key", item);
            startActivity(intent);
        }
    });
    listView.setAdapter(adapter);
}

@Override
protected void onStart() {
    super.onStart();
    adapter.startListening();
}

@Override
protected void onStop() {
    super.onStop();
    adapter.stopListening();
}

public class PubsSectionActivity extends AppCompatActivity {
ViewFlipper viewFlipp;
private DatabaseReference databaseReference;
private List<imageSection> slideLists;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pubs_section);

    viewFlipp = findViewById(R.id.viewFlipper);

    databaseReference = FirebaseDatabase.getInstance().getReference();
    slideLists = new ArrayList<>();
}

@Override
protected void onStart() {
    super.onStart();
    usingFirebaseDatabase();
}

private void usingFirebaseDatabase() {
    String lolipop = "Coiffeur";
    databaseReference.child("Sections/Restaurant")
            .addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    if (dataSnapshot.exists()) {
                        slideLists.clear();
                        for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                            imageSection model = snapshot.getValue(imageSection.class);
                            slideLists.add(model);
                        }

                        Toast.makeText(PubsSectionActivity.this, "All data fetched", Toast.LENGTH_SHORT).show();
                        usingFirebaseImages(slideLists);
                    } else {
                        Toast.makeText(PubsSectionActivity.this, "No images in firebase", Toast.LENGTH_SHORT).show();
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {
                    Toast.makeText(PubsSectionActivity.this, "NO images found \n" + databaseError.getMessage(), Toast.LENGTH_SHORT).show();
                }
            });
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

}
private void usingFirebaseImages(List<imageSection> slideLists) {
    for (int i = 0; i < slideLists.size(); i++) {
        String downloadImageUrl = slideLists.get(i).getImageUrl();
        Toast.makeText(this, downloadImageUrl, Toast.LENGTH_LONG).show();
        ImageView imageView = new ImageView(this);
        Picasso.get().load(downloadImageUrl).fit().centerCrop().into(imageView);
        viewFlipp.addView(imageView);
        viewFlipp.setInAnimation(this, android.R.anim.slide_in_left);
        viewFlipp.setOutAnimation(this, android.R.anim.slide_out_right);
    }
}

公共类PubsSectionActivity扩展了AppCompatActivity{
ViewFlipper ViewFlip；
私有数据库参考数据库参考；
私人名单幻灯片列表；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_pubs_部分）；
viewFlip=findviewbyd（R.id.viewFlipper）；
databaseReference=FirebaseDatabase.getInstance（）.getReference（）；
slidelist=newarraylist（）；
}
@凌驾
受保护的void onStart（）{
super.onStart（）；
使用FirebaseDatabase（）；
}
使用FirebaseDatabase（）的私有void{
字符串lolipop=“coiffer”；
databaseReference.child（“部门/餐厅”）
.addListenerForSingleValueEvent（新的ValueEventListener（）{
@凌驾
公共void onDataChange（DataSnapshot DataSnapshot）{
if（dataSnapshot.exists（））{
slideLists.clear（）；
对于（DataSnapshot快照：DataSnapshot.getChildren（））{
imageSection模型=snapshot.getValue（imageSection.class）；
添加（模型）；
}
Toast.makeText（PubsSectionActivity.this，“获取的所有数据”，Toast.LENGTH_SHORT.show（）；
使用FireBaseImages（幻灯片列表）；
}否则{
Toast.makeText（PubsSectionActivity.this，“firebase中没有图像”，Toast.LENGTH_SHORT.show（）；
}
}
@凌驾
已取消的公共void（DatabaseError DatabaseError）{
Toast.makeText（PubsSectionActivity.this，“未找到图像”+databaseError.getMessage（），Toast.LENGTH\u SHORT.show（）；
}
});
getWindow（）.setFlags（WindowManager.LayoutParams.FLAG_全屏，WindowManager.LayoutParams.FLAG_全屏）；
}
使用FireBaseImages的私有void（列表幻灯片列表）{
对于（int i=0；i
}

请帮帮我，我卡住了

我不知道为什么会出现此错误…

您正在将侦听器附加到
部分/餐厅
。因为那是一家特定的餐厅，所以您不需要在
onDataChange
中对孩子们进行循环

因此：

嘿，Mehdi.ncb。你有没有机会阅读并尝试下面我的答案？这解释并解决了问题吗？如果我的答案有用，请单击向上投票按钮(▲) 如果它回答了您的问题，请单击复选标记(✓) 接受它。这样别人就会知道你已经得到了（足够的）帮助。也请参见