Question

仅介绍一下我在做什么。

我根据用户登录的帐户类型授予不同的功能。

将通过Firebase参考从Firebase数据库检索用户的帐户类型。如果您查看此图像，则会显示箭头。那是显示帐户类型的地方，但是考虑到UI，我将文本视图的可见性设置为“ gone”。我已验证数据库参考代码在将文本视图的可见性设置为可见，然后运行该应用程序时可以正常工作，因此该文本视图将相应地更改为管理员或本地用户。

问题出在我的setVisibility'if else'逻辑上。它不能正常工作。随附的是我测试过的场景列表及其结果。

我尝试在铅笔图标上将可见性添加到“消失”，并使用VISIBILE / INVISIBLE / GONE而不在其前面放置View（就像许多人在几篇类似文章中所说的那样），但是当我尝试也就是说，在所有8种情况下该图标都是不可见。

因此，我不确定该如何克服其他问题。任何帮助将不胜感激。

更新＃1：根据要求添加了代码

class SearchViewHolder extends RecyclerView.ViewHolder {

public TextView keyword, description, acronym, relatedkeyword1, 
relatedkeyword2, relatedkeyword3, tv_rules_read_more;
public ImageView iv_rules;

public SearchViewHolder(@NonNull View itemView) {
    super(itemView);

    //knowledge feature
    keyword = itemView.findViewById(R.id.keyword);
    acronym = itemView.findViewById(R.id.acronym);
    tv_rules_read_more = itemView.findViewById(R.id.tv_rules_read_more);
    iv_rules = itemView.findViewById(R.id.iv_rules);
}
}

public class SearchAdapter extends RecyclerView.Adapter<SearchViewHolder> 
implements SectionIndexer {

//    private Context context;
private List<Knowledge> knowledge;
private ArrayList<Integer> mSectionPositions;
Activity activity;
String positionUpdated;

private FirebaseAuth firebaseAuth;
private FirebaseDatabase firebaseDatabase;

public SearchAdapter(Activity activity, List<Knowledge> knowledge, String 
positionUpdated) {
    //this.context = context;
    this.knowledge = knowledge;
    this.activity = activity;
    this.positionUpdated = positionUpdated;
}

@NonNull
@Override
public SearchViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int 
viewType) {
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    View itemView = inflater.inflate(R.layout.layout_item, parent, false);
    return new SearchViewHolder(itemView);

}

@Override
public void onBindViewHolder(@NonNull SearchViewHolder holder, final int 
position) {

    holder.keyword.setText(knowledge.get(position).getKeyword());
    holder.acronym.setText(knowledge.get(position).getAcronym());
    holder.tv_rules_read_more.setOnClickListener(new 
View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showDialog(position);
        }
    });
    if (positionUpdated != null && !positionUpdated.equals("")) {
        showDialog(Integer.parseInt(positionUpdated));
        positionUpdated = "";
    }

}

public void showDialog(final int position) {

    try {

        final Dialog dialog = new Dialog(activity);
        dialog.setContentView(R.layout.dialog_layout_item_rules);
        dialog.setCancelable(false);
        final TextView acctype, keyword1, description1, acronym1, 
        relatedkeyword4, relatedkeyword5, relatedkeyword6;
        //final TextView keyword1, description1, acronym1, 
        relatedkeyword4, relatedkeyword5, relatedkeyword6;
        ImageView iv_rules, iv_close_dialog, iv_edit_dialog;

        //rules feature
        acctype = dialog.findViewById(R.id.tvAccType);
        keyword1 = dialog.findViewById(R.id.keyword);
        acronym1 = dialog.findViewById(R.id.acronym);
        description1 = dialog.findViewById(R.id.description);
        relatedkeyword4 = dialog.findViewById(R.id.relatedKeyword1);
        relatedkeyword5 = dialog.findViewById(R.id.relatedKeyword2);
        relatedkeyword6 = dialog.findViewById(R.id.relatedKeyword3);
        iv_rules = dialog.findViewById(R.id.iv_rules);
        iv_close_dialog = dialog.findViewById(R.id.iv_close_dialog);
        iv_edit_dialog = dialog.findViewById(R.id.iv_edit_dialog);

        /////////
        firebaseAuth = FirebaseAuth.getInstance();
        firebaseDatabase = FirebaseDatabase.getInstance();

        DatabaseReference databaseReference = 
        firebaseDatabase.getReference(firebaseAuth.getUid());
        databaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                UserProfile userProfile = 
        dataSnapshot.getValue(UserProfile.class);
                acctype.setText(userProfile.getUserDepartment());
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) 
       {
            }
        });

        if (acctype.getText().toString().equals("Administrator")){
            iv_edit_dialog.setVisibility(View.VISIBLE);
        }else {
            iv_edit_dialog.setVisibility(View.INVISIBLE);
        }
        ////////

        keyword1.setText(knowledge.get(position).getKeyword());
        description1.setText(knowledge.get(position).getDescription());
        acronym1.setText(knowledge.get(position).getAcronym());

relatedkeyword4.setText(knowledge.get(position).getRelatedkeyword1());

relatedkeyword5.setText(knowledge.get(position).getRelatedkeyword2());

relatedkeyword6.setText(knowledge.get(position).getRelatedkeyword3());
        byte[] bytesImage = knowledge.get(position).getImage();
        if (bytesImage != null && bytesImage.length > 0) {
            Bitmap bitmap = BitmapFactory.decodeByteArray(bytesImage, 0, 
bytesImage.length);
            iv_rules.setImageBitmap(bitmap);
            iv_rules.setVisibility(View.VISIBLE);
        } else {
            iv_rules.setVisibility(View.GONE);
        }

        dialog.show();
        dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
        WindowManager.LayoutParams layoutParams = new 
WindowManager.LayoutParams();
        Window window = dialog.getWindow();
        layoutParams.copyFrom(window.getAttributes());
        layoutParams.width = WindowManager.LayoutParams.MATCH_PARENT;
        layoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
        window.setAttributes(layoutParams);

        iv_close_dialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                dialog.cancel();
            }
        });

        iv_edit_dialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(activity, 
AddNewKnowledgeActivity.class);
                intent.putExtra("id", 
String.valueOf(knowledge.get(position).getId()));
                intent.putExtra("position", String.valueOf(position));
                intent.putExtra("call_type", "update_rule");
                intent.putExtra("title", 
knowledge.get(position).getKeyword());
                intent.putExtra("code", 
knowledge.get(position).getAcronym());
                intent.putExtra("description", 
knowledge.get(position).getDescription());
                intent.putExtra("keyword1", 
knowledge.get(position).getRelatedkeyword1());
                intent.putExtra("keyword2", 
knowledge.get(position).getRelatedkeyword2());
                intent.putExtra("keyword3", 
knowledge.get(position).getRelatedkeyword3());
                intent.putExtra("bytesImage", 
knowledge.get(position).getImage());
                dialog.cancel();
                activity.startActivityForResult(intent, 101);
            }
        });
    } catch (Exception e) {

        e.printStackTrace();
    }
}

@Override
public int getItemCount() {
    return knowledge.size();
}


@Override
public int getSectionForPosition(int position) {
    return 0;
}

@Override
public Object[] getSections() {
    List<String> sections = new ArrayList<>(26);
    mSectionPositions = new ArrayList<>(26);
    for (int i = 0, size = knowledge.size(); i < size; i++) {
        String section = 
String.valueOf(knowledge.get(i).getKeyword().charAt(0)).toUpperCase();
        if (!sections.contains(section)) {
            sections.add(section);
            mSectionPositions.add(i);
        }
    }
    return sections.toArray(new String[0]);
}

@Override
public int getPositionForSection(int sectionIndex) {
    return mSectionPositions.get(sectionIndex);
}
}

更新2：添加了XML文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
app:cardBackgroundColor="#f5f0f0"
app:cardCornerRadius="10dp"
app:cardElevation="5dp">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/iv_rules"
            android:layout_width="200dp"
            android:layout_height="120dp"
            android:layout_centerHorizontal="true"
            android:src="@color/deeppurpleColor"
            android:visibility="gone" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:orientation="vertical">

            <ImageView
                android:id="@+id/iv_edit_dialog"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/_5sdp"
                android:background="@android:drawable/ic_menu_edit"
                android:backgroundTint="@android:color/black"/>
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentEnd="true"
            android:orientation="vertical">

            <ImageView
                android:id="@+id/iv_close_dialog"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/_5sdp"
                android:layout_alignParentRight="true"

android:background="@android:drawable/ic_menu_close_clear_cancel"
                android:backgroundTint="@android:color/black" />
        </LinearLayout>
    </RelativeLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp">

        <TextView
            android:id="@+id/tvAccType"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Account Type"
            android:visibility="gone"/>

        <TextView
            android:id="@+id/keyword"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:gravity="center_vertical|start"
            android:text="Baggage Management Interface Device (BMID) 
Testing 123"
            android:textAllCaps="true"
            android:textColor="#000000"
            android:textSize="15dp"
            android:textStyle="bold" />

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/codeHeader"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:layout_marginTop="5dp"
                android:gravity="center_vertical|start"
                android:text="Code:"
                android:textColor="#a8000000"
                android:textSize="13dp"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/acronym"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:gravity="center_vertical|start"
                android:text="GST"
                android:textColor="#a8000000"
                android:textSize="13dp"
                android:textStyle="italic" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/ruleHeader"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:layout_marginTop="5dp"
                android:gravity="center_vertical|start"
                android:text="Desc:"
                android:textColor="#a8000000"
                android:textSize="13dp"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/description"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:gravity="center_vertical|start"
                android:scrollbars="vertical"
                android:text="If none are set then 'GST' is set to NULL"
                android:textColor="#a8000000"
                android:textSize="13dp" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/relatedKeyword"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:layout_marginTop="5dp"
                android:gravity="center_vertical|start"
                android:text="Related Keyword:"
                android:textColor="#a8000000"
                android:textSize="12sp"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/relatedKeyword1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:clickable="true"
                android:text="Keyword 1,"
                android:textColor="#a8000000"
                android:textSize="12sp" />

            <TextView
                android:id="@+id/relatedKeyword2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:clickable="true"
                android:text="Keyword 2,"
                android:textColor="#a8000000"
                android:textSize="12sp" />

            <TextView
                android:id="@+id/relatedKeyword3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginTop="5dp"
                android:clickable="true"
                android:text="Keyword 3"
                android:textColor="#a8000000"
                android:textSize="12sp" />

        </LinearLayout>
    </LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>

Answer 1

通过将if / else逻辑放在onDataChange方法中来解决问题！

由于我的if / else逻辑被放置在循环之外，因此该逻辑无法正常工作。在Firebase检索然后显示值时，逻辑应该起作用。

就这样，而不是这些：

        DatabaseReference databaseReference = 
    firebaseDatabase.getReference(firebaseAuth.getUid());
    databaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            UserProfile userProfile = 
    dataSnapshot.getValue(UserProfile.class);
            acctype.setText(userProfile.getUserDepartment());
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) 
   {
        }
    });

    //note: these are outside of the loop at first
    if (acctype.getText().toString().equals("Administrator")){
        iv_edit_dialog.setVisibility(View.VISIBLE);
    }else {
        iv_edit_dialog.setVisibility(View.INVISIBLE);
    }

应该改为这样：

        DatabaseReference databaseReference = firebaseDatabase.getReference(firebaseAuth.getUid());
        databaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                UserProfile userProfile = dataSnapshot.getValue(UserProfile.class);
                acctype.setText(userProfile.getUserDepartment());

                //granting different functionality based on account type
                if (acctype.getText().toString().equals("Administrator")){
                    iv_edit_dialog.setVisibility(View.VISIBLE);
                }else {
                    iv_edit_dialog.setVisibility(View.INVISIBLE);
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
            }
        });

我很难学到教训！了解您要提出的逻辑并遵循预期的工作流程非常重要，非常重要！

非常感谢那些花时间指导我的人！

Android setVisibility在某些逻辑上不起作用

1 个答案: