Question

我有一个非活动类（恰好是一个持有cardviews的RecyclerView适配器），我正在尝试使用＆＃34;真实的动作＆＃34;使用共享图像元素从cardview转换到最终活动。我很容易在两个活动类之间实现它，但是从非活动类到活动类，我无法这样做？

这是我的代码（RecyclerViewAdapter.java）：

公共类RVAdapter扩展了RecyclerView.Adapter {

public static class PersonViewHolder extends RecyclerView.ViewHolder {


    CardView cv;
    TextView personName;
    TextView personAge;
    ImageView personPhoto;
    TextView myid;
    front ft = new front();

    PersonViewHolder(View itemView) {
        super(itemView);
        personName = (TextView)itemView.findViewById(R.id.person_name);
        personAge = (TextView)itemView.findViewById(R.id.person_age);
        personPhoto = (ImageView)itemView.findViewById(R.id.person_photo);
        myid = (TextView)itemView.findViewById(R.id.IDTAG);
        cv = (CardView)itemView.findViewById(R.id.cv);
        cv.setUseCompatPadding(true);
        cv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {


                final String cardid = myid.getText().toString().trim();
                Intent callIntent = new Intent("io.brushed.databasecardview.VIEWDATAINSIDE");
                callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                callIntent.putExtra("THEID",cardid);
                String transitionName = "oktrans";
                ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(this,
                        personPhoto,   // The view which starts the transition
                        transitionName    // The transitionName of the view we’re transitioning to
                );
                ActivityCompat.startActivity(this, callIntent, options.toBundle());

            }
        });



    }
}

List<Person> persons;

RVAdapter(List<Person> persons){
    this.persons = persons;
}

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
}

@Override
public PersonViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);
    PersonViewHolder pvh = new PersonViewHolder(v);
    return pvh;
}

@Override
public void onBindViewHolder(PersonViewHolder personViewHolder, int i) {
    personViewHolder.myid.setText(persons.get(i).id);
    personViewHolder.personName.setText(persons.get(i).name);
    personViewHolder.personAge.setText(persons.get(i).age);
    personViewHolder.personPhoto.setImageResource(persons.get(i).photoId);
}
@Override
public int getItemCount() {
    return persons.size();
}

}

它无法解决这个＆＃34;这个＆＃34;关键字，我应该用什么替换它，因为RecyclerView适配器是一个非活动类？

Answer 1

您可以将活动类的上下文传递给非活动类（恰好是持有cardview的RecyclerView适配器）

e.g。

RecyclerViewAdapter1(Context context...)

然后为此目的使用该上下文：

String transitionName = "oktrans";
ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(this,
personPhoto,transitionName);
ActivityCompat.startActivity(context, callIntent, options.toBundle());

编辑：

根据您的新修改。

将活动作为参数传递。

PersonalViewHolder(View view, Activity activity) {
...
ActivityCompat.startActivity(activity, ...);
}

public static class PersonViewHolder extends RecyclerView.ViewHolder {


CardView cv;
TextView personName;
TextView personAge;
ImageView personPhoto;
TextView myid;
front ft = new front();

PersonViewHolder(View itemView, final Context context) {
    super(itemView);
    personName = (TextView)itemView.findViewById(R.id.person_name);
    personAge = (TextView)itemView.findViewById(R.id.person_age);
    personPhoto = (ImageView)itemView.findViewById(R.id.person_photo);
    myid = (TextView)itemView.findViewById(R.id.IDTAG);
    cv = (CardView)itemView.findViewById(R.id.cv);
    cv.setUseCompatPadding(true);
    cv.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {


            final String cardid = myid.getText().toString().trim();
            Intent callIntent = new Intent("io.brushed.databasecardview.VIEWDATAINSIDE");
            callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            callIntent.putExtra("THEID",cardid);
            String transitionName = "oktrans";
            ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(context,
                    personPhoto,   // The view which starts the transition
                    transitionName    // The transitionName of the view we’re transitioning to
            );
            ActivityCompat.startActivity(context, callIntent, options.toBundle());

        }
    });



}

}

List<Person> persons;

RVAdapter(List<Person> persons){
this.persons = persons;
}

@Override
 public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
 }

 @Override
 public PersonViewHolder onCreateViewHolder(ViewGroup viewGroup, int i)   {
   View v =    LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item,   viewGroup, false);
   PersonViewHolder pvh = new PersonViewHolder(v, viewGroup.getContext());
  return pvh;
 }

@Override
public void onBindViewHolder(PersonViewHolder personViewHolder, int i)    {
personViewHolder.myid.setText(persons.get(i).id);
personViewHolder.personName.setText(persons.get(i).name);
personViewHolder.personAge.setText(persons.get(i).age);
personViewHolder.personPhoto.setImageResource(persons.get(i).photoId);
}
@Override
public int getItemCount() {
return persons.size();
}

}

Answer 2

您无法使用this，因为您位于持有其引用的块内。

另外，如果你看到startActivity（）方法的正确实现。

需要以下参数：

startActivity(Activity activity, Intent intent, Bundle options)

如果在片段

中，请将您的活动设为ActivityName.this或getActivity()

编辑：

根据您的新修改。

将活动作为参数传递。

PersonalViewHolder(View view, Activity activity) {
...
ActivityCompat.startActivity(activity, ...);
}

使用从非活动类到活动类的共享元素转换

2 个答案: