我有一个RecyclerView，我正在创建一个JSON数组，其中包含在onClick方法中单击的元素ID。我能够生成JSON数组，但是我将这个JSON数组传递给我的Activity时遇到了麻烦。
我创建了一个界面：
public interface ClientDataTransfer {
public void getValues(JSONArray jsonArray);
}
并修改了适配器构造函数，如下所示：
public ClientListAdapter(List<ClientListData> clientListData, Context context, ClientDataTransfer clientDataTransfer) {
super();
this.clientListData = clientListData;
this.context = context;
this.clientDataTransfer = clientDataTransfer;
}
在我的Activity类中，我正在设置适配器，如下所示：
recyclerViewAdapter = new ClientListAdapter(clientListData, this, this);
recyclerView.setAdapter(recyclerViewAdapter);
我在Activity类中实现了Interface并继承了该方法，但是我在Activity类中获取JSON数组时遇到了麻烦。
我在onBindViewHolder中的setOnClickListener方法中创建了JSON数组。
这是我的适配器类：
public class ClientListAdapter extends RecyclerView.Adapter<ClientListAdapter.ViewHolder> {
private Context context;
private List<ClientListData> clientListData;
public JSONArray clientArray = new JSONArray();
public ClientDataTransfer clientDataTransfer;
public ClientListAdapter(List<ClientListData> clientListData, Context context, ClientDataTransfer clientDataTransfer) {
super();
this.clientListData = clientListData;
this.context = context;
this.clientDataTransfer = clientDataTransfer;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.client_list_item, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
@Override
public void onBindViewHolder(final ClientListAdapter.ViewHolder holder, final int position) {
final ClientListData clientListDataModel = clientListData.get(position);
holder.clientList.setText(clientListDataModel.getClientName());
holder.itemView.setBackgroundColor(clientListDataModel.isSelected() ? Color.GRAY : Color.WHITE);
holder.clientList.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
clientListDataModel.setSelected(!clientListDataModel.isSelected());
try {
JSONObject clientObject = new JSONObject();
if(clientListDataModel.isSelected()) {
holder.itemView.setBackgroundColor(Color.GRAY);
clientObject.put("id", clientListData.get(position).getClientId());
clientArray.put(clientObject);
} else if(!clientListDataModel.isSelected()) {
holder.itemView.setBackgroundColor(Color.WHITE);
for (int i = 0; i < clientArray.length(); i++) {
clientObject = clientArray.getJSONObject(i);
if (clientObject.getString("id").equals(clientListDataModel.getClientId())) {
clientArray=removeFromJsonArray(clientArray,i);
break;
}
}
}
//clientArray.put(clientObject);
} catch (JSONException e) {
e.printStackTrace();
}
clientDataTransfer.getValues(clientArray);
Log.e("client id array", ""+clientArray);
}
});
}
@Override
public int getItemCount() {
return clientListData == null ? 0:clientListData.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
public TextView clientList;
public ViewHolder(View itemView) {
super(itemView);
clientList = (TextView) itemView.findViewById(R.id.tv_client_list);
}
}
private JSONArray removeFromJsonArray(JSONArray array,int position) {
JSONArray newArray = new JSONArray();
for (int i=0;i<array.length();i++)
{
//Excluding the item at position
if (i != position)
{
try {
newArray.put(array.get(i));
} catch (JSONException e) {
e.printStackTrace();
}
}
}
return newArray;
}
}
holder.clientList.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
clientListDataModel.setSelected(!clientListDataModel.isSelected());
try {
JSONObject clientObject = new JSONObject();
if(clientListDataModel.isSelected()) {
holder.itemView.setBackgroundColor(Color.GRAY);
clientObject.put("id", clientListData.get(position).getClientId());
clientArray.put(clientObject);
} else if(!clientListDataModel.isSelected()) {
holder.itemView.setBackgroundColor(Color.WHITE);
for (int i = 0; i < clientArray.length(); i++) {
clientObject = clientArray.getJSONObject(i);
if (clientObject.getString("id").equals(clientListDataModel.getClientId())) {
clientArray=removeFromJsonArray(clientArray,i);
break;
}
}
}
//clientArray.put(clientObject);
} catch (JSONException e) {
e.printStackTrace();
}
clientDataTransfer.getValues(clientArray);
Log.e("client id array", ""+clientArray);
}
});
这是我正在实现适配器的Activity类：
public class ClientListActivity extends AppCompatActivity implements View.OnClickListener, ClientDataTransfer {
private String groupId;
private String clientId;
private String clientName;
private RecyclerView recyclerView;
private List<ClientListData> clientListData;
private RecyclerView.LayoutManager recyclerViewLayoutManager;
private RecyclerView.Adapter recyclerViewAdapter;
private JSONArray clientArrayList = new JSONArray();
ClientDataTransfer clientDataTransferx;
private Toolbar toolbar;
private FloatingActionButton share;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_client_list);
recyclerView = (RecyclerView) findViewById(R.id.rv_client_list);
toolbar = (Toolbar) findViewById(R.id.client_list_toolbar);
share = (FloatingActionButton) findViewById(R.id.floating_action_button);
share.setOnClickListener(this);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(ContextCompat.getColor(this, R.color.colorSecondary));
}
setSupportActionBar(toolbar);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
clientListData = new ArrayList<>();
recyclerViewLayoutManager = new LinearLayoutManager(this);
recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setLayoutManager(recyclerViewLayoutManager);
if(getIntent() != null) {
Bundle bundle = getIntent().getExtras();
try {
JSONObject jsonClientListObject = new JSONObject(getIntent().getStringExtra("clientList"));
JSONArray clientArray = jsonClientListObject.optJSONArray("activeClients");
for(int i = 0 ; i < clientArray.length(); i++) {
ClientListData clientListData = new ClientListData();
clientListData.setClientId(clientArray.getJSONObject(i).getString("id"));
clientListData.setClientName(clientArray.getJSONObject(i).getString("name"));
clientId = clientListData.getClientId();
clientName = clientListData.getClientName();
}
groupId = bundle.getString("groupId");
for(int i=0; i<clientArray.length(); i++) {
ClientListData clientListDataModel = new ClientListData();
JSONObject jsonObject = null;
jsonObject = clientArray.getJSONObject(i);
clientListDataModel.setClientName(jsonObject.getString("name"));
clientListDataModel.setClientId(jsonObject.getString("id"));
clientListData.add(clientListDataModel);
}
recyclerViewAdapter = new ClientListAdapter(clientListData, this, this);
recyclerView.setAdapter(recyclerViewAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
/*@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.select_all, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.select_all:
break;
}
return super.onOptionsItemSelected(item);
}*/
@Override
public void getValues(JSONArray jsonArray) {
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.floating_action_button:
clientDataTransferx = new ClientDataTransfer() {
@Override
public void getValues(JSONArray jsonArray) {
clientDataTransferx.getValues(clientArrayList);
}
};
break;
}
}
}
答案 0 :(得分：1)
将json对象传递为String
当你必须阅读使用时： -
JJSONObject obj = new JSONObject(Stringhere);
JSONArray jsonArray = obj.getJSONArray("results");
ArrayList < objectClass > somearray= new ArrayList < objectClass > ();
for (int i = 0; i < jsonArray.length(); i++)
{
Movie objectClass = new objectClass();
JSONObject json_data = jsonArray.getJSONObject(i);
somearray.setImageUrl(json_data.getString("key1"));
somearray.setTitle(json_data.getString("key2"));
somearray.setPlot(json_data.getString("key3"));
}