android - 将选定的值传递给另一个 Activity (使用 recycleview/textView)

Question

我正在制作一个 pokedex 应用程序，但我一直坚持将所选口袋妖怪的数据传递给另一个 Activity (以显示更多详细信息)。问题是即使我选择了不同的口袋妖怪，它也会一直向其他 Activity 发送相同的值(列表中的第一个值，在本例中为 bulbasaur)。

该列表由一个 recycleview、textView 和一个 imageView 组成。我使用 textView 的值作为数据发送到其他 Activity 。

所以我想在单击图像时将正确的名称 (textView) 从选定的 pokemon 传递给其他 Activity 。我不确定我错过了什么。

提前致谢!

---

适配器代码

public class PokemonListAdapter extends RecyclerView.Adapter<PokemonListAdapter.ViewHolder>{

private ArrayList<Pokemon> dataset;
private Context context;

public PokemonListAdapter(Context context){
    this.context = context;
    dataset = new ArrayList<>();
}

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

@Override
public void onBindViewHolder(ViewHolder holder, int position){
    Pokemon p = dataset.get(position);
    holder.pokemonTextView.setText(p.getName());

    Glide.with(context).load("http://pokeapi.co/media/sprites/pokemon/" + p.getNumber() + ".png")
            .centerCrop()
            .crossFade()
            .into(holder.pictureImageView);

}

@Override
public int getItemCount(){
    return dataset.size();
}

public void toegevoegdePokemonList(ArrayList<Pokemon> pokemonList) {
    dataset.addAll(pokemonList);
    notifyDataSetChanged();
}

public class ViewHolder extends RecyclerView.ViewHolder{
    private ImageView pictureImageView;
    private TextView pokemonTextView;


    public ViewHolder(View itemView) {
        super(itemView);
        pictureImageView = (ImageView) itemView.findViewById(R.id.pictureImageView);
        pokemonTextView = (TextView) itemView.findViewById(R.id.pokemonTextView);
    }
}

---

第一个 Activity (列表)

 public class Pokedex extends AppCompatActivity {

private Retrofit retrofit;
private static final String TAG = "POKEDEX";
private RecyclerView recyclerView;
private PokemonListAdapter pokemonListAdapter;
private int offset;
private boolean loaded;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pokedex);

    //recycleViewer
    recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    pokemonListAdapter = new PokemonListAdapter(this);
    recyclerView.setAdapter(pokemonListAdapter);
    recyclerView.setHasFixedSize(true);

    //grid
    final GridLayoutManager layoutManager = new GridLayoutManager(this, 3);
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);

            if(dy > 0){
                int visibleItemCount = layoutManager.getChildCount();
                int totalItemCount = layoutManager.getItemCount();
                int partVisible = layoutManager.findFirstVisibleItemPosition();

                if(loaded){
                    if((visibleItemCount + partVisible) >= totalItemCount){
                        Log.i(TAG, "Final");
                        loaded = false;
                        offset += 20;
                        getDataPokemon(offset);
                    }
                }
            }
        }
    });

    //retrofit
    retrofit = new Retrofit.Builder()
            .baseUrl("http://pokeapi.co/api/v2/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();

    loaded = true;
    offset = 0;

    getDataPokemon(offset);
}


//method
private void getDataPokemon(int offset) {
    apiService service = retrofit.create(apiService.class);
    Call<PokemonRequest> pokemonRequestCall = service.getPokemonList(20, offset);

    pokemonRequestCall.enqueue(new Callback<PokemonRequest>() {
        @Override
        public void onResponse(Call<PokemonRequest> call, Response<PokemonRequest> response) {
            loaded = true;
            if (response.isSuccessful()) {

                PokemonRequest pokemonRequest = response.body();
                ArrayList<Pokemon> pokemonList = pokemonRequest.getResults();

                pokemonListAdapter.toegevoegdePokemonList(pokemonList);

            } else {
                Log.e(TAG, "onResponse: " + response.errorBody());
            }
        }

        @Override
        public void onFailure(Call<PokemonRequest> call, Throwable t) {
            loaded = true;
            Log.e(TAG, "onFailure: " + t.getMessage());
        }

    });
}


public void pokemon_onClick(View v)
{
    TextView textView = (TextView)findViewById(R.id.pokemonTextView);
    Intent intent = new Intent();
    intent.putExtra("pokemonName", textView.getText().toString());
    intent.setClass(this, PokemonDetail.class);
    startActivity(intent);
}

---

Xml 布局文件(第一个 Activity )

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="be.thomasmore.project_idexv2.Pokedex">

<android.support.v7.widget.RecyclerView
    android:id="@+id/recyclerView"
    android:layout_height="match_parent"
    android:layout_width="match_parent"/>

---

xml布局文件(显示图片和文字)

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">

<ImageView
    android:id="@+id/pictureImageView"
    android:layout_width="96dp"
    android:layout_height="96dp"
    android:layout_gravity="center_horizontal"
    android:onClick="pokemon_onClick"/>

<TextView
    android:id="@+id/pokemonTextView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="@string/app_name"
    android:gravity="center_horizontal"/>
     <!--android:textAllCaps="true"-->

---

第二个 Activity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_pokemon_detail);

    String pokemon = getIntent().getExtras().getString("pokemonName");
    TextView textView = (TextView)findViewById(R.id.pokemonName);
    textView.setText(pokemon);
}

Answer 1

这样不行。当调用 pokemon_onClick() 时，findViewById 将返回 ID 为 pokemonTextView 的 View 的第一次出现。这就是您在第二个 Activity 中收到相同值的原因。

最简单的解决方案是在您的 ViewHolder 中实现 onClickListener 并直接从那里启动第二个 Activity。

public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private ImageView pictureImageView;
        private TextView pokemonTextView;

    public ViewHolder(View itemView) {
        super(itemView);

        itemView.setClickable(true);
        itemView.setOnClickListener(this);

        pictureImageView = (ImageView) itemView.findViewById(R.id.pictureImageView);
        pokemonTextView = (TextView) itemView.findViewById(R.id.pokemonTextView);
    }

    @Override
    public void onClick(View v) {
        Intent intent = new Intent(context, PokemonDetail.class);
        intent.putExtra("pokemonName", dataset.get(getAdapterPosition()).getName());
        context.startActivity(intent);
    }
}

有点复杂但更好的解决方案是创建一个界面并在您的 Activity 中处理点击回调:

在您的适配器中创建接口(interface)并提供 setter :

private PokemonClickListener listener;

public void setListener(PokemonClickListener listener) {
    this.listener = listener;
}

public interface PokemonClickListener{
    void onPokemonClicked(Pokemon pokemon);
}

如上所述在 ViewHolder 中实现 OnClickListener，但调用监听器方法而不是启动第二个 Activity:

@Override
public void onClick(View v) {
    if(listener != null){
        listener.onPokemonClicked(dataset.get(getAdapterPosition()));
    }
}

在您的 Activity 中，实现 PokemonClickListener 并将监听器设置为适配器。

adapter.setListener(new PokemonClickListener() {
    @Override
    public void onPokemonClicked(Pokemon pokemon) {
        Intent intent = new Intent(this, PokemonDetail.class);
        intent.putExtra("pokemonName", pokemon.getName());
        startActivity(intent);
    }
});