Android通过单击recyclerview将jsonObject传递给另一个活动

Question

我正在用Android开发应用程序。

我正在使用改型从URL（ http://kerast.com/pokemon/pokemons.json ）获取包含神奇宝贝名称的JSON数据。 名称和类型会显示在一个recyclerView中，并且在彼此单击后会打开“活动”并显示攻击，防御和移动。

到目前为止，我已经能够打开一个新活动，但不知道如何传递对象。 我想没有必要通过为每个活动重写两次相同的代码来重新加载json吗？

这是我的课：

public class Pokemon {

    private String name;
    private String type;
    private Integer attack;
    private Integer defense;
    private Integer evolveLevel;

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getType() {
        return type;
    }

    public Integer getattack() { return attack; }

    public Integer getdefense() { return defense; }

    public Integer getEvolveLevel() { return evolveLevel; }
}

我的DataAdpater：

public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder> implements Filterable {

    private ArrayList<Pokemon> mArrayList;
    private ArrayList<Pokemon> mFilteredList;



    public DataAdapter(ArrayList<Pokemon> arrayList) {
        mArrayList = arrayList;
        mFilteredList = arrayList;

    }

    @Override
    public DataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_row, viewGroup, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(DataAdapter.ViewHolder viewHolder, int i) {

        viewHolder.tv_name.setText(mFilteredList.get(i).getName());
        viewHolder.tv_version.setText(mFilteredList.get(i).getName());
        viewHolder.tv_api_level.setText(mFilteredList.get(i).getType());
    }

    @Override
    public int getItemCount() {

        return mFilteredList.size();
    }

    @Override
    public Filter getFilter() {

        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence charSequence) {

                String charString = charSequence.toString();

                if (charString.isEmpty()) {

                    mFilteredList = mArrayList;
                } else {

                    ArrayList<Pokemon> filteredList = new ArrayList<>();

                    for (Pokemon marraylist : mArrayList) {

                        if (marraylist.getName().toLowerCase().contains(charString) ||  marraylist.getType().toLowerCase().contains(charString)) {

                            filteredList.add(marraylist);
                        }
                    }

                    mFilteredList = filteredList;
                }

                FilterResults filterResults = new FilterResults();
                filterResults.values = mFilteredList;
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
                mFilteredList = (ArrayList<Pokemon>) filterResults.values;
                notifyDataSetChanged();
            }
        };
    }

    public class ViewHolder extends RecyclerView.ViewHolder{
        private TextView tv_name,tv_version,tv_api_level;
        public ViewHolder(View view) {
            super(view);

            tv_name = (TextView)view.findViewById(R.id.tv_name);
            tv_version = (TextView)view.findViewById(R.id.tv_version);
            tv_api_level = (TextView)view.findViewById(R.id.tv_api_level);

            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Intent intent = new Intent(view.getContext(), Main2Activity.class);
                    intent.putExtra("attack", Pokemon);
                    view.getContext().startActivity(intent);
                }
            });

        }
    }

}

最后是我的MainActivity：

public class MainActivity extends AppCompatActivity {

    public static final String BASE_URL = "http://kerast.com";
    private RecyclerView mRecyclerView;
    private ArrayList<Pokemon> mArrayList;
    private DataAdapter mAdapter;

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

        initViews();
        loadJSON();
    }

    private void initViews(){
        mRecyclerView = (RecyclerView)findViewById(R.id.card_recycler_view);
        mRecyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
        mRecyclerView.setLayoutManager(layoutManager);
    }
    private void loadJSON(){
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        RequestInterface request = retrofit.create(RequestInterface.class);
        Call<JSONResponse> call = request.getJSON();
        call.enqueue(new Callback<JSONResponse>() {
            @Override
            public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {

                JSONResponse jsonResponse = response.body();
                mArrayList = new ArrayList<>(Arrays.asList(jsonResponse.getPokemons()));
                mAdapter = new DataAdapter(mArrayList);
                mRecyclerView.setAdapter(mAdapter);
            }

            @Override
            public void onFailure(Call<JSONResponse> call, Throwable t) {
                Log.d("Error",t.getMessage());
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.menu_main, menu);

        MenuItem search = menu.findItem(R.id.search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(search);
        search(searchView);
        return true;
    }

    private void search(SearchView searchView) {

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {

                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {

                mAdapter.getFilter().filter(newText);
                return true;
            }
        });
    }
}

那么，如何才能仅在第二个活动中显示“攻击防御”和“ evolveLevel”呢？

Answer 1

实现序列化接口Pokemon实现序列化，然后可以使用putExtra（）在意图中额外传递对象实例

//send : 
intent.putExtra("Pokemon", obj);
//retrieve :
getIntent().getSerializableExtra("MyClass");

Answer 2

好吧，akshay的答案是正确的，但我认为这将是更好的方法。 我们可以使用Parcelable类代替Serializable 。

请参阅以下链接，了解黑白可拆分和可序列化的区别

并创建POJO类可打包我使用在线创建器 。

休息都一样

//Sending data
intent.putExtra("String name", object);

//Receving end
Bundle bundle = getIntent().getExtras();
if (bundle != null) {
    Pokemon pokemon = (Pokemon) bundle.getParcelable("String name")
}