在用户点击时更新FirebaseUI FirebaseRecyclerView子视图

Question

我从Firebase数据库开始。我做了一个小的任务跟踪器应用程序，我能够将项目推送到数据库。我正在使用Firebase UI和FriebaseRecyclerView。

问题是我无法从firebaseRecyclerView更新子项单击。下面是我的视图持有人的代码。但是在复选框点击我的数据库没有按预期更新。

 public static class TaskViewHolder extends RecyclerView.ViewHolder{
 TextView title,description;
 CheckBox checkBox;
 FirebaseAuth mAuth;
 FirebaseUser firebaseUser;
    public TaskViewHolder(View v) {
        super(v);
        title = (TextView) v.findViewById(R.id.title);
        description= (TextView) v.findViewById(R.id.Description);
        checkBox = (CheckBox) v.findViewById(R.id.checkboxTaskRow);
        mAuth = FirebaseAuth.getInstance();
        firebaseUser = mAuth.getCurrentUser();
        checkBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RecyclerView recyclerView = (RecyclerView) v.findViewById(R.id.taskList);
                final FirebaseRecyclerAdapter firebaseRecyclerAdapter = (FirebaseRecyclerAdapter) recyclerView.getAdapter();
                if(checkBox.isChecked()) {
                    SpannableString content = new SpannableString(title.getText());
                    content.setSpan(new StrikethroughSpan(), 0, content.length(), 0);
                    title.setText(content);
                    content = new SpannableString(description.getText());
                    content.setSpan(new StrikethroughSpan(), 0, content.length(), 0);
                    description.setText(content);
                }
                else
                {
                    description.setText(description.getText().toString());
                    title.setText(title.getText().toString());
                }
            }
        });
    } }

下面是我的适配器代码

  final FirebaseRecyclerAdapter<UnitTask,TaskViewHolder> adapter =
            new FirebaseRecyclerAdapter<UnitTask, TaskViewHolder>(UnitTask.class,R.layout.task,TaskViewHolder.class,userRef) {
                @Override
                protected void populateViewHolder(TaskViewHolder viewHolder, UnitTask model, int position) {
                    mAuth = FirebaseAuth.getInstance();
                    firebaseUser = mAuth.getCurrentUser();
                    viewHolder.title.setText(model.getTitle());
                    viewHolder.description.setText(model.getDescription());
                    viewHolder.checkBox.setChecked(model.isCompleted());
                }

            };

My UnitTask类

public class UnitTask {
public String title;
public String description;
boolean completed;
public UnitTask(String title, String description, boolean completed) {
    this.title = title;
    this.description = description;
    this.completed = completed;
}
public String getTitle() {
    return title;
}
public void setTitle(String title) {
    this.title = title;
}
public String getDescription() {
    return description;
}
public void setDescription(String description) {
    this.description = description;
}
public boolean isCompleted() {
    return completed;
}
public void setCompleted(boolean completed) {
    this.completed = completed;
}
public UnitTask() {
    // Do Nothing
}
}

任何帮助都将非常感激。另外，我刚刚开始使用android，所以希望我能犯一些愚蠢的错误。

谢谢

Answer 1

达到目的的一个方法是:

1)当用户检查一个项目时，让push一个"特殊值"到firebase db.

2)在FirebaseRecyclerAdapter#populateViewHolder:如果项目有"特殊值"，改变布局

试试google的例子:

https://github.com/firebase/quickstart-android/blob/master/database

让我们看看星号按钮的实现。

在PostListFragment.java中你会发现:

// Determine if the current user has liked this post and set UI accordingly
if (model.stars.containsKey(getUid())) {
    viewHolder.starView.setImageResource(R.drawable.ic_toggle_star_24);
} else {
    viewHolder.starView.setImageResource(R.drawable.ic_toggle_star_outline_24);
}
// Bind Post to ViewHolder, setting OnClickListener for the star button
viewHolder.bindToPost(model, new View.OnClickListener() {
    @Override
    public void onClick(View starView) {
        // Need to write to both places the post is stored
        DatabaseReference globalPostRef = mDatabase.child("posts").child(postRef.getKey());
        DatabaseReference userPostRef = mDatabase.child("user-posts").child(model.uid).child(postRef.getKey());
        // Run two transactions
        onStarClicked(globalPostRef);
        onStarClicked(userPostRef);
    }
});

Answer 2

@Muhammad Hassan Niazi在if条件中使用push或setvalue方法更新数据库记录