JSON 响应在 Android 应用程序的回收站视图中使用 Volley
JSON response Using Volley in a recycler view in Android app
我正在尝试在 recyclerview 中打印 json 响应响应。我的 Recyclerview 就像一个扩展的 listView。而我的 json 共鸣是这样的：
{"Table1":
[
{"filedate":"Oct 26, 2016"},
{"filedate":"Oct 18, 2016"}
],
"Table2":
[{
"filedate":"Oct 18, 2016",
"file1":"12.txt"
},
{
"filedate":"Oct 26, 2016",
"file1":"acerinvoice.pdf"
}
]}
我尝试使用此代码打印此 json 响应：
private void prepareListData() {
// Volley's json array request object
StringRequest stringRequest = new StringRequest(Request.Method.POST, REGISTER_URL,
new Response.Listener<String>() {
//I think problrm is here
@Override
public void onResponse(String response) {
try {
**JSONObject object = new JSONObject(response);
JSONArray jsonarray = object.getJSONArray("Table1");
JSONArray jsonarray1 = object.getJSONArray("Table2");
for (int i = 0; i < jsonarray.length(); i++) {
try {
JSONObject obj = jsonarray.getJSONObject(i);
String str = obj.optString("filedate").trim();
int lth = jsonarray1.length();
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.HEADER, str));
for (int j = 0; j < jsonarray1.length(); j++) {
try {
JSONObject obj1 = jsonarray1.getJSONObject(j);
String str1 = obj1.optString("filedate").trim();
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD, str1));
Toast.makeText(getApplicationContext(), str1, Toast.LENGTH_LONG).show();**
//if condition
} catch (JSONException e) {
// Log.e(TAG, "JSON Parsing error: " + e.getMessage());
}
}
// adding movie to movies array
} catch (JSONException e) {
Log.e("gdshfsjkg", "JSON Parsing error: " + e.getMessage());
}
}
Log.d("test", String.valueOf(data));
Toast.makeText(getApplicationContext(), (CharSequence) data, Toast.LENGTH_LONG).show();
} catch (JSONException e) {
e.printStackTrace();
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
recyclerview.setAdapter(new ExpandableListAdapter(data));
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}){
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(CLIENT, "4");
return params;
}
};
// Adding request to request queue
MyApplication.getInstance().addToRequestQueue(stringRequest);
}
ExpandableListAdapter
public class ExpandableListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
public static final int HEADER = 0;
public static final int CHILD = 1;
private List<Item> data;
public ExpandableListAdapter(List<Item> data) {
this.data = data;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int type) {
View view = null;
Context context = parent.getContext();
float dp = context.getResources().getDisplayMetrics().density;
int subItemPaddingLeft = (int) (18 * dp);
int subItemPaddingTopAndBottom = (int) (5 * dp);
switch (type) {
case HEADER:
LayoutInflater inflater = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_header, parent, false);
ListHeaderViewHolder header = new ListHeaderViewHolder(view);
return header;
case CHILD:
TextView itemTextView = new TextView(context);
itemTextView.setPadding(subItemPaddingLeft, subItemPaddingTopAndBottom, 0, subItemPaddingTopAndBottom);
itemTextView.setTextColor(0x88000000);
itemTextView.setLayoutParams(
new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
return new RecyclerView.ViewHolder(itemTextView) {
};
}
return null;
}
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
final Item item = data.get(position);
switch (item.type) {
case HEADER:
final ListHeaderViewHolder itemController = (ListHeaderViewHolder) holder;
itemController.refferalItem = item;
itemController.header_title.setText(item.text);
if (item.invisibleChildren == null) {
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_minus);
} else {
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_plus);
}
itemController.btn_expand_toggle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (item.invisibleChildren == null) {
item.invisibleChildren = new ArrayList<Item>();
int count = 0;
int pos = data.indexOf(itemController.refferalItem);
while (data.size() > pos + 1 && data.get(pos + 1).type == CHILD) {
item.invisibleChildren.add(data.remove(pos + 1));
count++;
}
notifyItemRangeRemoved(pos + 1, count);
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_plus);
} else {
int pos = data.indexOf(itemController.refferalItem);
int index = pos + 1;
for (Item i : item.invisibleChildren) {
data.add(index, i);
index++;
}
notifyItemRangeInserted(pos + 1, index - pos - 1);
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_minus);
item.invisibleChildren = null;
}
}
});
break;
case CHILD:
TextView itemTextView = (TextView) holder.itemView;
itemTextView.setText(data.get(position).text);
break;
}
}
@Override
public int getItemViewType(int position) {
return data.get(position).type;
}
@Override
public int getItemCount() {
return data.size();
}
private static class ListHeaderViewHolder extends RecyclerView.ViewHolder {
public TextView header_title;
public ImageView btn_expand_toggle;
public Item refferalItem;
public ListHeaderViewHolder(View itemView) {
super(itemView);
header_title = (TextView) itemView.findViewById(R.id.header_title);
btn_expand_toggle = (ImageView) itemView.findViewById(R.id.btn_expand_toggle);
}
}
public static class Item {
public int type;
public String text;
public List<Item> invisibleChildren;
public Item() {
}
public Item(int type, String text) {
this.type = type;
this.text = text;
}
}
}
但是这段代码在我的回收站中没有打印任何内容 UI.It 只显示一个空 layout.I 我也尝试在我的日志中打印响应并且它一起打印了整个响应。我想打印 headers 中的 table1 内容和 child(items) 中的 table2 内容及其各自的 headers。如何执行此操作？如果需要任何其他信息，请询问..
请检查您的 json 响应，这是无效的 json 响应首先尝试验证您的 json 甲酸，然后尝试解码并添加到回收站视图中。
您可能应该首先检查您的回复。根据您的要求，您应该使用 HashMap 和 ArrayList。按照以下步骤操作：
1.Take 一个 ArrayLsit 并存储 child 第一个标题的数据等等，索引从 0 开始。
2.Store headers 在 HashMap 中作为键。
ex: HashMap<String,ArrayList<Data>> hm;
hm.put("your first heading string","related arraylist");
然后使用 ExpandableListView 排列 parent 和 child 项。
将您的回复检查到 Logcat 也是异常。我已经测试了您提供的响应，其中包含一些不必要的“，”，可能会导致异常。
我已经解决了我的问题，只需像这样更改上面的代码..
private void prepareListData() {
// Volley's json array request object
StringRequest stringRequest = new StringRequest(Request.Method.POST, REGISTER_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONObject object = null;
try {
object = new JSONObject(response);
} catch (JSONException e) {
e.printStackTrace();
}
JSONArray jsonarray = null;
JSONArray jsonarray1 = null;
try {
jsonarray = object.getJSONArray("Table1");
jsonarray1 = object.getJSONArray("Table1");
} catch (JSONException e) {
e.printStackTrace();
}
for (int i = 0; i < jsonarray.length(); i++) {
try {
JSONObject obj = jsonarray.getJSONObject(i);
//
String str = obj.optString("filedate").trim();
Log.d("test", str);
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.HEADER, str));
// Toast.makeText(getApplicationContext(), lth, Toast.LENGTH_LONG).show();
for (int j = 0; j < jsonarray1.length(); j++) {
try {
JSONObject obj1 = jsonarray1.getJSONObject(j);
String str1 = obj1.optString("filedate").trim();
String str3 = obj1.optString("category").trim();
String str2 = obj1.optString("file1").trim();
String str4 = obj1.optString("4").trim();
Toast.makeText(getApplicationContext(), "server data respone", Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "test"+str1, Toast.LENGTH_LONG).show();
if (str == str1) {
// data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD, str1));
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD, str3));
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD, str2));
}
Toast.makeText(getApplicationContext(), str1, Toast.LENGTH_LONG).show();
//if condition
} catch (JSONException e) {
// Log.e(TAG, "JSON Parsing error: " + e.getMessage());
}
}
// adding movie to movies array
} catch (JSONException e) {
Log.e("gdshfsjkg", "JSON Parsing error: " + e.getMessage());
}
}
Log.d("test", String.valueOf(data));
// notifying list adapter about data changes
// so that it renders the list view with updated data
// adapterheader.notifyDataSetChanged();
recyclerview.setAdapter(new ExpandableListAdapter(data));
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// VolleyLog.d(TAG, "Error: " + error.getMessage());
// hidePDialog();
}
}){
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(CLIENT, "4");
return params;
}
};
// Adding request to request queue
MyApplication.getInstance().addToRequestQueue(stringRequest);
}
我正在尝试在 recyclerview 中打印 json 响应响应。我的 Recyclerview 就像一个扩展的 listView。而我的 json 共鸣是这样的：
{"Table1":
[
{"filedate":"Oct 26, 2016"},
{"filedate":"Oct 18, 2016"}
],
"Table2":
[{
"filedate":"Oct 18, 2016",
"file1":"12.txt"
},
{
"filedate":"Oct 26, 2016",
"file1":"acerinvoice.pdf"
}
]}
我尝试使用此代码打印此 json 响应：
private void prepareListData() {
// Volley's json array request object
StringRequest stringRequest = new StringRequest(Request.Method.POST, REGISTER_URL,
new Response.Listener<String>() {
//I think problrm is here
@Override
public void onResponse(String response) {
try {
**JSONObject object = new JSONObject(response);
JSONArray jsonarray = object.getJSONArray("Table1");
JSONArray jsonarray1 = object.getJSONArray("Table2");
for (int i = 0; i < jsonarray.length(); i++) {
try {
JSONObject obj = jsonarray.getJSONObject(i);
String str = obj.optString("filedate").trim();
int lth = jsonarray1.length();
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.HEADER, str));
for (int j = 0; j < jsonarray1.length(); j++) {
try {
JSONObject obj1 = jsonarray1.getJSONObject(j);
String str1 = obj1.optString("filedate").trim();
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD, str1));
Toast.makeText(getApplicationContext(), str1, Toast.LENGTH_LONG).show();**
//if condition
} catch (JSONException e) {
// Log.e(TAG, "JSON Parsing error: " + e.getMessage());
}
}
// adding movie to movies array
} catch (JSONException e) {
Log.e("gdshfsjkg", "JSON Parsing error: " + e.getMessage());
}
}
Log.d("test", String.valueOf(data));
Toast.makeText(getApplicationContext(), (CharSequence) data, Toast.LENGTH_LONG).show();
} catch (JSONException e) {
e.printStackTrace();
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
recyclerview.setAdapter(new ExpandableListAdapter(data));
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}){
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(CLIENT, "4");
return params;
}
};
// Adding request to request queue
MyApplication.getInstance().addToRequestQueue(stringRequest);
}
ExpandableListAdapter
public class ExpandableListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
public static final int HEADER = 0;
public static final int CHILD = 1;
private List<Item> data;
public ExpandableListAdapter(List<Item> data) {
this.data = data;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int type) {
View view = null;
Context context = parent.getContext();
float dp = context.getResources().getDisplayMetrics().density;
int subItemPaddingLeft = (int) (18 * dp);
int subItemPaddingTopAndBottom = (int) (5 * dp);
switch (type) {
case HEADER:
LayoutInflater inflater = (LayoutInflater) parent.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_header, parent, false);
ListHeaderViewHolder header = new ListHeaderViewHolder(view);
return header;
case CHILD:
TextView itemTextView = new TextView(context);
itemTextView.setPadding(subItemPaddingLeft, subItemPaddingTopAndBottom, 0, subItemPaddingTopAndBottom);
itemTextView.setTextColor(0x88000000);
itemTextView.setLayoutParams(
new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
return new RecyclerView.ViewHolder(itemTextView) {
};
}
return null;
}
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
final Item item = data.get(position);
switch (item.type) {
case HEADER:
final ListHeaderViewHolder itemController = (ListHeaderViewHolder) holder;
itemController.refferalItem = item;
itemController.header_title.setText(item.text);
if (item.invisibleChildren == null) {
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_minus);
} else {
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_plus);
}
itemController.btn_expand_toggle.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (item.invisibleChildren == null) {
item.invisibleChildren = new ArrayList<Item>();
int count = 0;
int pos = data.indexOf(itemController.refferalItem);
while (data.size() > pos + 1 && data.get(pos + 1).type == CHILD) {
item.invisibleChildren.add(data.remove(pos + 1));
count++;
}
notifyItemRangeRemoved(pos + 1, count);
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_plus);
} else {
int pos = data.indexOf(itemController.refferalItem);
int index = pos + 1;
for (Item i : item.invisibleChildren) {
data.add(index, i);
index++;
}
notifyItemRangeInserted(pos + 1, index - pos - 1);
itemController.btn_expand_toggle.setImageResource(R.drawable.circle_minus);
item.invisibleChildren = null;
}
}
});
break;
case CHILD:
TextView itemTextView = (TextView) holder.itemView;
itemTextView.setText(data.get(position).text);
break;
}
}
@Override
public int getItemViewType(int position) {
return data.get(position).type;
}
@Override
public int getItemCount() {
return data.size();
}
private static class ListHeaderViewHolder extends RecyclerView.ViewHolder {
public TextView header_title;
public ImageView btn_expand_toggle;
public Item refferalItem;
public ListHeaderViewHolder(View itemView) {
super(itemView);
header_title = (TextView) itemView.findViewById(R.id.header_title);
btn_expand_toggle = (ImageView) itemView.findViewById(R.id.btn_expand_toggle);
}
}
public static class Item {
public int type;
public String text;
public List<Item> invisibleChildren;
public Item() {
}
public Item(int type, String text) {
this.type = type;
this.text = text;
}
}
}
但是这段代码在我的回收站中没有打印任何内容 UI.It 只显示一个空 layout.I 我也尝试在我的日志中打印响应并且它一起打印了整个响应。我想打印 headers 中的 table1 内容和 child(items) 中的 table2 内容及其各自的 headers。如何执行此操作？如果需要任何其他信息，请询问..
请检查您的 json 响应，这是无效的 json 响应首先尝试验证您的 json 甲酸，然后尝试解码并添加到回收站视图中。
您可能应该首先检查您的回复。根据您的要求，您应该使用 HashMap 和 ArrayList。按照以下步骤操作：
1.Take 一个 ArrayLsit 并存储 child 第一个标题的数据等等，索引从 0 开始。 2.Store headers 在 HashMap 中作为键。
ex: HashMap<String,ArrayList<Data>> hm;
hm.put("your first heading string","related arraylist");
然后使用 ExpandableListView 排列 parent 和 child 项。
将您的回复检查到 Logcat 也是异常。我已经测试了您提供的响应，其中包含一些不必要的“，”，可能会导致异常。
我已经解决了我的问题，只需像这样更改上面的代码..
private void prepareListData() {
// Volley's json array request object
StringRequest stringRequest = new StringRequest(Request.Method.POST, REGISTER_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONObject object = null;
try {
object = new JSONObject(response);
} catch (JSONException e) {
e.printStackTrace();
}
JSONArray jsonarray = null;
JSONArray jsonarray1 = null;
try {
jsonarray = object.getJSONArray("Table1");
jsonarray1 = object.getJSONArray("Table1");
} catch (JSONException e) {
e.printStackTrace();
}
for (int i = 0; i < jsonarray.length(); i++) {
try {
JSONObject obj = jsonarray.getJSONObject(i);
//
String str = obj.optString("filedate").trim();
Log.d("test", str);
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.HEADER, str));
// Toast.makeText(getApplicationContext(), lth, Toast.LENGTH_LONG).show();
for (int j = 0; j < jsonarray1.length(); j++) {
try {
JSONObject obj1 = jsonarray1.getJSONObject(j);
String str1 = obj1.optString("filedate").trim();
String str3 = obj1.optString("category").trim();
String str2 = obj1.optString("file1").trim();
String str4 = obj1.optString("4").trim();
Toast.makeText(getApplicationContext(), "server data respone", Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "test"+str1, Toast.LENGTH_LONG).show();
if (str == str1) {
// data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD, str1));
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD, str3));
data.add(new ExpandableListAdapter.Item(ExpandableListAdapter.CHILD, str2));
}
Toast.makeText(getApplicationContext(), str1, Toast.LENGTH_LONG).show();
//if condition
} catch (JSONException e) {
// Log.e(TAG, "JSON Parsing error: " + e.getMessage());
}
}
// adding movie to movies array
} catch (JSONException e) {
Log.e("gdshfsjkg", "JSON Parsing error: " + e.getMessage());
}
}
Log.d("test", String.valueOf(data));
// notifying list adapter about data changes
// so that it renders the list view with updated data
// adapterheader.notifyDataSetChanged();
recyclerview.setAdapter(new ExpandableListAdapter(data));
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// VolleyLog.d(TAG, "Error: " + error.getMessage());
// hidePDialog();
}
}){
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put(CLIENT, "4");
return params;
}
};
// Adding request to request queue
MyApplication.getInstance().addToRequestQueue(stringRequest);
}