我正试图从我的PHP文件解析JSON响应。第一个AsyncTask返回有效的结果，第二个没有。我相信问题是在我的"mysql_queries.php"。
public class GeneralAssets extends ListFragment {
View view;
EditText cn, pn;
ActionBar ab;
private String url = "http://192.168.x.x/questions.php";
private String companyName, projectName;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.general_assets_questions, container,
false);
ab = getActivity().getActionBar();
cn = (EditText)view.findViewById(R.id.company_input);
pn = (EditText)view.findViewById(R.id.project_input);
Button load = (Button) view
.findViewById(R.id.generalAssets_load_button_ID);
load.setOnClickListener(new View.OnClickListener() {
boolean large = getResources().getConfiguration()
.isLayoutSizeAtLeast(Configuration.SCREENLAYOUT_SIZE_LARGE);
@Override
public void onClick(View v) {
new LoadAllQuestions().execute();
}
});
return view;
}
class LoadAllQuestions extends AsyncTask<String, String, String> {
private static final String TAG_SUCCESS = "success";
private static final String TAG_QUESTIONS = "questions";
private static final String TAG_NAME = "display_name";
private static final String TAG_FIELD = "field_type";
private ProgressDialog pDialog;
JSONParser jParser = new JSONParser();
JSONArray questions = null;
ArrayList<HashMap<String, String>> questionsList = new ArrayList<HashMap<String,String>>();
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Loading questions. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected String doInBackground(String... args) {
// getting JSON string from URL
companyName = cn.getText().toString();
projectName = pn.getText().toString();
String componentName = (String) ab.getSelectedTab().getText();
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
3);
nameValuePairs
.add(new BasicNameValuePair("company", companyName));
nameValuePairs
.add(new BasicNameValuePair("project", projectName));
nameValuePairs
.add(new BasicNameValuePair("component", componentName));
JSONObject json = jParser.makeHttpRequest(url, "POST",
nameValuePairs);
// Check your log cat for JSON reponse
Log.d("All Questions: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found: getting Array of Questions
questions = json.getJSONArray(TAG_QUESTIONS);
// looping through All Questions
for (int i = 0; i < questions.length(); i++) {
JSONObject c = questions.getJSONObject(i);
// Storing each json item in variable
String name = c.getString(TAG_NAME);
String field = c.getString(TAG_FIELD);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_NAME, name);
map.put(TAG_FIELD, field);
// adding HashList to ArrayList
questionsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Log.v("ERROR", "No JSON for you!");
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
getActivity().runOnUiThread(new Runnable() {
public void run() {
//Updating parsed JSON data into ListView
ListAdapter adapter = new SimpleAdapter(getActivity(),
questionsList,
R.id.genA_layout,
new String[] { TAG_FIELD, TAG_NAME },
new int[] { R.id.answer, R.id.name });
// updating listview
setListAdapter(adapter);
}
});
}
}
}
"SearchPosts"类在Log.v"结果"String中返回以下内容，这是我正在寻找的JSON响应。
{
"questions": [
{
"display_name": "Store #",
"field_type": "Text Field",
"option_value": ""
},
{
"display_name": "Address",
"field_type": "Text Field",
"option_value": ""
},
{
"display_name": "Type of Business",
"field_type": "Drop Down Menu",
"option_value": "Education'r'nHealth'r'nComputers'r'nFood'r'nRetail'r'nOther"
},
{
"display_name": "Is this business good?",
"field_type": "Radio",
"option_value": "Yes'r'nNo"
},
{
"display_name": "Are they nice people?",
"field_type": "Check Box",
"option_value": "Yes'r'nNo"
}
],
"success": 1
}
"LoadAllQuestions"类返回这个，然后崩溃
06-02 02:24:05.909: E/json data(17350): json result <br /><b>Notice</b>: Undefined
index: company in <b>C:'xampp'htdocs'mysql_queries.php</b> on line <b>4</b><br /><br />
<b>Notice</b>: Undefined index: project in <b>C:'xampp'htdocs'mysql_queries.php</b> on
line <b>5</b><br /><br /><b>Notice</b>: Undefined index: component in
<b>C:'xampp'htdocs'mysql_queries.php</b> on line <b>6</b><br />No results found
这是我的PHP文件
questions.php
<?php
require 'connect.php';
require 'mysql_queries.php';
if ($query_run = mysql_query($questions_query)) {
if (mysql_num_rows($query_run) == NULL) {
echo ('No results found');
} else {
$response ['questions'] = array();
while ($row = mysql_fetch_assoc($query_run)) {
$info = array();
$info['display_name'] = $row['display_name'];
$info ['field_type'] = $row['field_type'];
$info ['option_value'] = $row['option_value'];
array_push($response["questions"], $info);
}
// success
$response["success"] = 1;
// echoing JSON response
echo json_encode($response);
}
} else {
$response["success"] = 0;
$response["message"] = "No data found";
echo json_encode($response);
}
?>
mysql_query
<?php
require_once 'connect.php';
$company_name = $_POST['company'];
$project_name = $_POST['project'];
$component_name = $_POST['component'];
$questions_query = "SELECT CFM.display_name, CFM.field_type, CFM.option_value
FROM company_mast
LEFT JOIN component_mast
ON company_mast.id = component_mast.company_id
LEFT JOIN CustomField_mast CFM
ON CFM.Company_ID = Component_mast.Company_ID
AND CFM.Component_ID = component_Mast.Component_ID
WHERE component_mast.component_name = '".$component_name."'
AND (component_mast.project_id = '".$project_name."'
OR company_mast.company_name = '".$company_name."')";
?>
那么为什么第一个AsyncTask返回一个有效的响应，而第二个null出现呢?
我的有根据的猜测是，POST在"LoadAllQuestions"类试图解析JSON响应时超出了范围，但我是新的，我不知道如何修复它。
编辑
我根据建议调整了代码。我收到了正确的JSON响应，但我现在在我的logcat中收到了这个。
06-02 03:16:27.539: E/json data(19020): json result {"questions": [{"display_name":"Store #","field_type":"Text Field","option_value":""},{"display_name":"Address","field_type":"Text Field","option_value":""},{"display_name":"Type of Business","field_type":"Drop Down Menu","option_value":"Education'r'nHealth'r'nComputers'r'nFood'r'nRetail'r'nOther"},{"display_name":"Is this business good?","field_type":"Radio","option_value":"Yes'r'nNo"},{"display_name":"Are they nice people?","field_type":"Check Box","option_value":"Yes'r'nNo"}],"success":1}
06-02 03:16:27.539: D/All Questions:(19020): {"success":1,"questions":[{"option_value":"","field_type":"Text Field","display_name":"Store #"},{"option_value":"","field_type":"Text Field","display_name":"Address"},{"option_value":"Education'r'nHealth'r'nComputers'r'nFood'r'nRetail'r'nOther","field_type":"Drop Down Menu","display_name":"Type of Business"},{"option_value":"Yes'r'nNo","field_type":"Radio","display_name":"Is this business good?"},{"option_value":"Yes'r'nNo","field_type":"Check Box","display_name":"Are they nice people?"}]}
06-02 03:35:11.069: E/json data(19250): json result {"questions":[{"display_name":"Store #","field_type":"Text Field","option_value":""},{"display_name":"Address","field_type":"Text Field","option_value":""},{"display_name":"Type of Business","field_type":"Drop Down Menu","option_value":"Education'r'nHealth'r'nComputers'r'nFood'r'nRetail'r'nOther"},{"display_name":"Is this business good?","field_type":"Radio","option_value":"Yes'r'nNo"},{"display_name":"Are they nice people?","field_type":"Check Box","option_value":"Yes'r'nNo"}],"success":1}
06-02 03:35:11.079: D/All Questions:(19250): {"success":1,"questions":[{"option_value":"","field_type":"Text Field","display_name":"Store #"},{"option_value":"","field_type":"Text Field","display_name":"Address"},{"option_value":"Education'r'nHealth'r'nComputers'r'nFood'r'nRetail'r'nOther","field_type":"Drop Down Menu","display_name":"Type of Business"},{"option_value":"Yes'r'nNo","field_type":"Radio","display_name":"Is this business good?"},{"option_value":"Yes'r'nNo","field_type":"Check Box","display_name":"Are they nice people?"}]}
06-02 03:35:11.109: D/AndroidRuntime(19250): Shutting down VM
06-02 03:35:11.109: W/dalvikvm(19250): threadid=1: thread exiting with uncaught exception (group=0x41093930)
06-02 03:35:11.129: E/AndroidRuntime(19250): FATAL EXCEPTION: main
06-02 03:35:11.129: E/AndroidRuntime(19250): android.content.res.Resources$NotFoundException: Resource ID #0x7f09009f type #0x12 is not valid
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.content.res.Resources.loadXmlResourceParser(Resources.java:2144)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.content.res.Resources.getLayout(Resources.java:853)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.LayoutInflater.inflate(LayoutInflater.java:394)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.SimpleAdapter.createViewFromResource(SimpleAdapter.java:121)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.SimpleAdapter.getView(SimpleAdapter.java:114)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.AbsListView.obtainView(AbsListView.java:2159)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.ListView.onMeasure(ListView.java:1130)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.View.measure(View.java:15518)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.View.measure(View.java:15518)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1052)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.View.measure(View.java:15518)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1217)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.ScrollView.onMeasure(ScrollView.java:321)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.View.measure(View.java:15518)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.View.measure(View.java:15518)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1231)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.onMeasure(LinearLayout.java:590)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.View.measure(View.java:15518)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.View.measure(View.java:15518)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.View.measure(View.java:15518)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
06-02 03:35:11.129: E/AndroidRuntime(19250): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.View.measure(View.java:15518)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.Choreographer.doFrame(Choreographer.java:532)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.os.Handler.handleCallback(Handler.java:725)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.os.Handler.dispatchMessage(Handler.java:92)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.os.Looper.loop(Looper.java:137)
06-02 03:35:11.129: E/AndroidRuntime(19250): at android.app.ActivityThread.main(ActivityThread.java:5041)
06-02 03:35:11.129: E/AndroidRuntime(19250): at java.lang.reflect.Method.invokeNative(Native Method)
06-02 03:35:11.129: E/AndroidRuntime(19250): at java.lang.reflect.Method.invoke(Method.java:511)
06-02 03:35:11.129: E/AndroidRuntime(19250): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-02 03:35:11.129: E/AndroidRuntime(19250): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-02 03:35:11.129: E/AndroidRuntime(19250): at dalvik.system.NativeStart.main(Native Method)
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gen_assets"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="@drawable/twoglobe_line"
android:gravity="center"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/genA_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="10dp"
android:gravity="center"
android:orientation="horizontal" >
<LinearLayout
android:id="@+id/loader_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:gravity="center"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/info_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:gravity="center"
android:orientation="horizontal" >
<TextView
android:id="@+id/company_name"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center"
android:text="@string/company_name" />
<EditText
android:id="@+id/company_input"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:ems="10" />
</LinearLayout>
<LinearLayout
android:id="@+id/info_layout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:gravity="center"
android:orientation="horizontal" >
<TextView
android:id="@+id/project_name"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center"
android:text="@string/project_name" />
<EditText
android:id="@+id/project_input"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:ems="10" />
</LinearLayout>
<Button
android:id="@+id/generalAssets_load_button_ID"
style="?android:attr/borderlessButtonStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/load" />
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false" >
</ListView>
</LinearLayout>
<TextView
android:id="@+id/name"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2"
android:visibility="gone" />
<TextView
android:id="@+id/answer"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2"
android:visibility="gone" />
</LinearLayout>
</ScrollView>
变化
jParser.makeHttpRequest(url, "GET",
params);
jParser.makeHttpRequest(url, "POST",
params);
然后BEFORE那行，在你的ArrayList初始化之后，将这些值添加到数组中，我假设它们与SearchPost使用的期望值相同。
String companyName = cn.getText().toString();
String projectName = pn.getText().toString();
String componentName = (String) ab.getSelectedTab().getText();
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("company", companyName));
params.add(new BasicNameValuePair("project", projectName));
params.add(new BasicNameValuePair("component", componentName));
然后初始化questionList
questionList = ArrayList<HashMap<String, String>>();
编辑2:
改变R.id.genA_layout
R.layout.genA_layout
你应该做一个单独的xml布局文件定义如何每个列表视图行应该看起来像两个textview id R.id。回答,R.id.name。
一个简单的模型可能看起来像这样:(请测试，我已经从答案框中直接编码了这个)。
MyListViewRow.xml
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="vertical"> <!-- You can make orientation horizontal also -->
<TextView
android:id="@+id/answer"
android:layout_height="wrap_content"
android:layout_width="wrap_content"/>
<TextView
android:id="@+id/answer"
android:layout_height="wrap_content"
android:layout_width="wrap_content"/>
</LinearLayout>
之后，更改R.id。genA_layout到R.layout.MyListViewRow
您在Android应用程序中使用GET请求，但您尝试在PHP代码中获取POST数据。我想你应该改一下:
jParser.makeHttpRequest(url, "GET",
params);
:
jParser.makeHttpRequest(url, "POST",
params);
第二个AsyncTask没有向请求添加任何参数，即公司、项目和组件。此外，您没有检查请求中参数的存在性，并且正如@koesie回答中提到的，您必须将请求类型更改为POST而不是GET。
因为你正在发送GET请求，所以参数应该在$_GET中可用，但是php代码检查$_POST数据
希望这对你有帮助
你必须初始化questionList
questionList = ArrayList<HashMap<String, String>>();
ListAdapter adapter = new SimpleAdapter(getActivity(),
questionsList,
R.layout.genA_layout,
new String[] { TAG_FIELD, TAG_NAME },
new int[] { R.id.answer, R.id.name });
// updating listview
setListAdapter(adapter);