如何在活动中单击按钮时使复选框在RecyclerView中可见

Question

我在一个活动中有一个按钮和一个回收器视图。在回收器视图(适配器类中的viewholder(的每一行中，我都有一个不可见的复选框。我想要的是，当用户单击按钮时，每行中的复选框都应该可见。我怎样才能做到这一点？

Answer 1

试试这个例子，就像Jyotish Biswas解释的那样，我已经用一个例子做了，我认为这个解释会消除你的疑虑。

ArrayList<Model> mModelList;
TestRecyclerViewAdapter mTestRecyclerViewAdapter;
RecyclerView mRecyclerView;
private String dummy_groups[] = {
"Group 1",
"Group 2",
"Group 3",
"Group 4",
"Group 5",
"Group 6",
"Group 7",
"Group 8"

};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
checkAllBoxes = findViewById(R.id.checkAllBoxes);

mRecyclerView = findViewById(R.id.recyclerView);
mRecyclerView.setHasFixedSize(true);
ArrayList<Model> recordsDataLists = prepareData();
mRecyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
mTestRecyclerViewAdapter = new TestRecyclerViewAdapter(recordsDataLists);
mRecyclerView.setAdapter(mTestRecyclerViewAdapter);
mModelList = prepareData();
mTestRecyclerViewAdapter.updateData(mModelList);
checkAllBoxes.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
for (int i = 0; i < mTestRecyclerViewAdapter.getItemCount(); i++)
{
mModelList.get(i).setChecked(true);
mTestRecyclerViewAdapter.notifyDataSetChanged();
}
}
});
}
private ArrayList<Model> prepareData() {
ArrayList<Model> theImage = new ArrayList<>();
for (int i = 0; i < dummy_groups.length ; i++){
Model createList = new Model();
createList.setName(dummy_groups[i]);
//createList.setChecked(true);
theImage.add(createList);
}
return theImage;
}

适配器类别：

public class TestRecyclerViewAdapter extends 
RecyclerView.Adapter<TestRecyclerViewAdapter.TestRecyclerViewHolder> {
ArrayList<Model> mModel;
public TestRecyclerViewAdapter(ArrayList<Model> model) {
mModel = model;
}
public void updateData(ArrayList<Model> modelArrayList){
mModel.clear();
mModel.addAll(modelArrayList);
notifyDataSetChanged();
}
@NonNull
@Override
public TestRecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup 
parent, int viewType) {
View view = 


LayoutInflater.from(parent.getContext()).inflate(R.layout.recylerview_layout,parent,false);
return new TestRecyclerViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull TestRecyclerViewHolder holder, int position) {
Model model = mModel.get(position);
if (model.isChecked())
{
holder.checkBoxes.setVisibility(View.VISIBLE);
}
}
@Override
public int getItemCount() {
return mModel.size();
}
public class TestRecyclerViewHolder extends RecyclerView.ViewHolder{
CheckBox checkBoxes;
public TestRecyclerViewHolder(@NonNull View itemView) {
super(itemView);
checkBoxes = itemView.findViewById(R.id.checkBoxes);
}
}
}
recylcerview.layout.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:weightSum="10"
android:orientation="horizontal"
android:layout_height="50dp">

<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="8"
android:text="@string/app_name"
android:layout_gravity="center"
android:textSize="25sp"
android:gravity="center"
android:textStyle="bold"/>

<CheckBox
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2"
android:layout_gravity="center"
android:gravity="center"
android:id="@+id/checkBoxes"
android:visibility="gone"/>

</LinearLayout>

.java型号

public class Model {
public boolean isChecked;
public String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public boolean isChecked() {
return isChecked;
}
public void setChecked(boolean checked) {
isChecked = checked;
}
}

试试这个，如果你有任何问题，请告诉我。

Answer 2

使用布尔标志点击按钮设置该标志为true并为该适配器设置CCD_ 1和适配器onBind勾选该标志，如果标志为true，则为复选框设置可见性VISIBLE其他GONE

Answer 3

您可以在Viewholder中这样做：

整个观众：

holder.mycheckbox.setVisibility(View.GONE);