Question

TextViews内有CardView个TextView。我必须为某些条件隐藏其中一个textview.SetVisibility(View.GONE)。即使在写<?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_marginRight="5dp" android:layout_marginTop="10dp" android:padding="30dp"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/listitemtaskname" android:layout_marginLeft="5dp" android:layout_width="match_parent" android:layout_height="wrap_content" android:textStyle="bold" android:textSize="25sp" tools:text="Hi" /> <TextView android:id="@+id/listitemdatedetails" android:layout_marginLeft="5dp" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="15sp" tools:text="By" /> </LinearLayout> > </android.support.v7.widget.CardView>之后，它仍然可见。请帮忙

list_item.xml

public class TaskCursorAdapter extends RecyclerCursorAdapter<TaskCursorAdapter.ViewHolder> {
    Context context;
    Cursor cursor;


    public TaskCursorAdapter(Context context, Cursor cursor){
        super(context,cursor);
        this.cursor=cursor;
        this.context=context;

    }

    public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        public TextView taskname;
        public TextView dateDetails;
        Context context;
        Cursor cursor;

        public ViewHolder(View view,Context context,Cursor cursor) {
            super(view);
            this.context = context;
            this.cursor = cursor;
            taskname=(TextView)view.findViewById(R.id.listitemtaskname);
            dateDetails=(TextView)view.findViewById(R.id.listitemdatedetails);
            view.setOnClickListener(this);
        }


        @Override
        public void onClick(View v) {

            // Form the content URI that represents the specific pet that was clicked on,
            // by appending the "id" (passed as input to this method) onto the
            // {@link PetEntry#CONTENT_URI}.
            // For example, the URI would be "content://com.example.android.pets/pets/2"
            // if the pet with ID 2 was clicked on.
            Intent intent = new Intent(context, EditorActivity.class);
            Uri currentPetUri = ContentUris.withAppendedId(TaskContract.TaskEntry.CONTENT_URI, this.getAdapterPosition()+1);

            intent.setData(currentPetUri);
            context.startActivity(intent);


        }
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater=LayoutInflater.from(parent.getContext());
        View view= layoutInflater.inflate(R.layout.list_item,parent,false);
        return new ViewHolder(view,context,cursor);
    }

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, Cursor cursor) {

        int taskColumnIndex=cursor.getColumnIndex(TaskContract.TaskEntry.NAME);
        int dateColumnIndex=cursor.getColumnIndex(TaskContract.TaskEntry.DUEDATE);
        int timeColumnIndex=cursor.getColumnIndex(TaskContract.TaskEntry.DUETIME);

        String task=cursor.getString(taskColumnIndex);
        String dateString=cursor.getString(dateColumnIndex);
        String timeString=cursor.getString(timeColumnIndex);

        viewHolder.cursor = cursor;
        viewHolder.taskname.setText(task);

        if(timeString==null && dateString==null){
            //viewHolder.dateDetails.setText("");
            dateDetails.setVisibility(View.GONE);

        }
        else {
            viewHolder.dateDetails.setText(dateString+"\t\t"+timeString);
        }

    }
}

这些用于我的recyclerview。如果listitemdatedetails为空，我会尝试隐藏它所以在CursorAdapter的onBindViewHolder方法中我试图隐藏它但它不会消失

ViewController

Answer 1

基本上，在您的示例中，您无法隐藏LinearLayout中的任何TextView，它是CardView的子项，因为不允许将LinearLayout用于CardView。

如果您希望能够隐藏内部元素，请尝试将主布局设置为LinearLayout，并在其中将CardView与要隐藏的TextView放在一起。就像这样：

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="5dp"
    android:layout_marginTop="10dp"
    android:padding="30dp"
    android:orientation="vertical">

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/listitemtaskname"
            android:layout_marginLeft="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textStyle="bold"
            android:textSize="25sp"
            tools:text="Hi" />


        <TextView
            android:id="@+id/listitemdatedetails"
            android:layout_marginLeft="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            tools:text="By" />

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

</LinearLayout>

然后尝试设置元素的可见性。

CardView里面的TextView不会隐藏

1 个答案: