我内部有RecyclerView
和CardView
。现在我要做的是在点击CardView时加载一个简单的Fragment
。我无法使用FragmentManager或SupportFragmentManager执行此操作。请给我一些指示。
我的RecyclerViewAdapder和ViewHolder是......
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
private String[] eventName;
private String[] eventBrief;
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView textViewName, textViewBrief;
public CardView cardView;
public ViewHolder(View v) {
super(v);
textViewName = (TextView)v.findViewById(R.id.textViewName);
textViewBrief = (TextView)v.findViewById(R.id.textViewBrief);
final Context context = v.getContext();
cardView = (CardView)v.findViewById(R.id.card_view);
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
EventFragment eventFragment = EventFragment.newInstance();
// Load and view eventFragment here??
}
});
}
}
public RecyclerViewAdapter(String[] eventName, String[] eventBrief) {
this.eventName = eventName;
this.eventBrief = eventBrief;
}
@Override
public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_card_view, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.textViewName.setText(eventName[position]);
holder.textViewBrief.setText(eventBrief[position]);
}
@Override
public int getItemCount() {
return eventName.length;
}
}
答案 0 :(得分:7)
一个简单的实现是在onClickListener()
的构造函数中向ViewHolder
itemView
添加Adapter
。
public MyViewHolder(View view) {
super(view);
itemView.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view){
AppCompatActivity activity = (AppCompatActivity) view.getContext();
Fragment myFragment = new MyFragment();
activity.getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, myFragment).addToBackStack(null).commit();
}
});
}
答案 1 :(得分:5)
我无法用FragmentManager或者那样做 SupportFragmentManager
那是因为RecyclerViewAdapter
没有对FragmentManager
的引用。您应该与托管RecyclerView
的活动/片段进行通信,发生事件,并从那里开始片段。为此,请检查我的回答here
答案 2 :(得分:4)
真的有很多方法可以解决这个问题。我觉得最好的实现是对活动的回调,通知单击了一个项目。我将帮您解决一些代码,见下文:
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
private String[] eventName;
private String[] eventBrief;
private OnItemClickListener listener;
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView textViewName, textViewBrief;
public CardView cardView;
private OnItemClickListener listener;
public ViewHolder(View v, OnItemClickListener listener) {
super(v);
textViewName = (TextView)v.findViewById(R.id.textViewName);
textViewBrief = (TextView)v.findViewById(R.id.textViewBrief);
final Context context = v.getContext();
cardView = (CardView)v.findViewById(R.id.card_view);
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(listener!=null)
listener.onItemClick(textViewName.getText().toString(),
textViewBrief.getText().toString();
}
});
}
}
public RecyclerViewAdapter(String[] eventName, String[] eventBrief) {
this.eventName = eventName;
this.eventBrief = eventBrief;
}
@Override
public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_card_view, parent, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.textViewName.setText(eventName[position]);
holder.textViewBrief.setText(eventBrief[position]);
holder.setOnItemClickListener(listener);
}
@Override
public int getItemCount() {
return eventName.length;
}
public void setOnItemClickListener(OnItemClickListener listener){
this.listener = listener
}
public interface OnItemClickListener {
public void onItemClick(String textName, String textViewBrief);
}
}
然后在你的活动中就像这样实例化它:
RecyclerViewAdapter adapter = new RecyclerViewAdapter(eventName, eventBrief);
adapter.setOnItemClickListener(new RecyclerViewAdapter.OnItemClickListener(){
public void onItemClick(String textName, String textViewBrief){
EventFragment eventFragment = EventFragment.newInstance();
//replace content frame with your own view.
FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); ft.replace(R.id.content_frame, eventFragment).commit()
}
});