嗨在我的应用程序中，我正在使用此js文件来获取json响应
xamp->htdoc->node-chat->node_modules->config->request这是文件的路径
http://www.learn2crack.com/2014/11/android-chat-application-using-gcm-mysql.html
在客户端，我正在使用这样的路径
UserFragment.java
public class UserFragment extends Fragment {
ListView list;
ArrayList<HashMap<String, String>> users = new ArrayList<HashMap<String, String>>();
Button refresh,logout;
List<NameValuePair> params;
SharedPreferences prefs;
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) {
View view =inflater.inflate(R.layout.user_fragment, container, false);
prefs = getActivity().getSharedPreferences("Chat", 0);
list = (ListView)view.findViewById(R.id.listView);
refresh = (Button)view.findViewById(R.id.refresh);
logout = (Button)view.findViewById(R.id.logout);
logout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new Logout().execute();
}
});
refresh.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getFragmentManager().beginTransaction().remove(getFragmentManager().findFragmentById(R.id.content_frame)).commit();
Fragment reg = new UserFragment();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, reg);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();
}
});
new Load().execute();
return view;
}
private class Load extends AsyncTask<String, String, JSONArray> {
@Override
protected JSONArray doInBackground(String... args) {
JSONParser json = new JSONParser();
params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("mobno", prefs.getString("REG_FROM","")));
JSONArray jAry = json.getJSONArray("http://10.0.2.2:8080/node-chat/getuser",params);
return jAry;
}
@Override
protected void onPostExecute(JSONArray json) {
for(int i = 0; i < json.length(); i++){
JSONObject c = null;
try {
c = json.getJSONObject(i);
String name = c.getString("name");
String mobno = c.getString("mobno");
HashMap<String, String> map = new HashMap<String, String>();
map.put("name", name);
map.put("mobno", mobno);
users.add(map);
} catch (JSONException e) {
e.printStackTrace();
}
}
ListAdapter adapter = new SimpleAdapter(getActivity(), users,
R.layout.user_list_single,
new String[] { "name","mobno" }, new int[] {
R.id.name, R.id.mobno});
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Bundle args = new Bundle();
args.putString("mobno", users.get(position).get("mobno"));
Intent chat = new Intent(getActivity(), ChatActivity.class);
chat.putExtra("INFO", args);
startActivity(chat);
}
});
}
}
private class Logout extends AsyncTask<String, String, JSONObject> {
@Override
protected JSONObject doInBackground(String... args) {
JSONParser json = new JSONParser();
params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("mobno", prefs.getString("REG_FROM","")));
JSONObject jObj = json.getJSONFromUrl("http://10.0.2.2:8080/node-chat/logout",params);
return jObj;
}
@Override
protected void onPostExecute(JSONObject json) {
String res = null;
try {
res = json.getString("response");
Toast.makeText(getActivity(),res,Toast.LENGTH_SHORT).show();
if(res.equals("Removed Sucessfully")) {
Fragment reg = new LoginFragment();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, reg);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();
SharedPreferences.Editor edit = prefs.edit();
edit.putString("REG_FROM", "");
edit.commit();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
运行此应用程序后出现此logcat错误。
logcat的
12-29 01:47:09.198: E/Buffer Error(1982): Error converting result java.lang.NullPointerException: lock == null
12-29 01:47:09.198: E/JSON Parser(1982): Error parsing data org.json.JSONException: End of input at character 0 of
12-29 01:47:58.818: D/AndroidRuntime(1982): Shutting down VM
12-29 01:47:58.818: W/dalvikvm(1982): threadid=1: thread exiting with uncaught exception (group=0xb2aa5ba8)
12-29 01:47:58.938: E/AndroidRuntime(1982): FATAL EXCEPTION: main
12-29 01:47:58.938: E/AndroidRuntime(1982): Process: com.example.androidchat, PID: 1982
12-29 01:47:58.938: E/AndroidRuntime(1982): java.lang.NullPointerException
12-29 01:47:58.938: E/AndroidRuntime(1982): at com.example.androidchat.UserFragment$Load.onPostExecute(UserFragment.java:85)
12-29 01:47:58.938: E/AndroidRuntime(1982): at com.example.androidchat.UserFragment$Load.onPostExecute(UserFragment.java:1)
12-29 01:47:58.938: E/AndroidRuntime(1982): at android.os.AsyncTask.finish(AsyncTask.java:632)
12-29 01:47:58.938: E/AndroidRuntime(1982): at android.os.AsyncTask.access$600(AsyncTask.java:177)
12-29 01:47:58.938: E/AndroidRuntime(1982): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
12-29 01:47:58.938: E/AndroidRuntime(1982): at android.os.Handler.dispatchMessage(Handler.java:102)
12-29 01:47:58.938: E/AndroidRuntime(1982): at android.os.Looper.loop(Looper.java:136)
12-29 01:47:58.938: E/AndroidRuntime(1982): at android.app.ActivityThread.main(ActivityThread.java:5017)
12-29 01:47:58.938: E/AndroidRuntime(1982): at java.lang.reflect.Method.invokeNative(Native Method)
12-29 01:47:58.938: E/AndroidRuntime(1982): at java.lang.reflect.Method.invoke(Method.java:515)
12-29 01:47:58.938: E/AndroidRuntime(1982): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
12-29 01:47:58.938: E/AndroidRuntime(1982): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
12-29 01:47:58.938: E/AndroidRuntime(1982): at dalvik.system.NativeStart.main(Native Method)
12-29 01:48:12.648: W/System.err(1982): org.apache.http.conn.HttpHostConnectException: Connection to http://10.0.2.2:8080 refused
12-29 01:48:12.658: W/System.err(1982): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
12-29 01:48:12.668: W/System.err(1982): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
12-29 01:48:12.678: W/System.err(1982): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
12-29 01:48:12.688: W/System.err(1982): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
12-29 01:48:12.698: W/System.err(1982): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
12-29 01:48:12.708: W/System.err(1982): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
12-29 01:48:12.718: W/System.err(1982): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
12-29 01:48:12.728: W/System.err(1982): at com.example.androidchat.JSONParser.getJSONArray(JSONParser.java:81)
12-29 01:48:12.748: W/System.err(1982): at com.example.androidchat.UserFragment$Load.doInBackground(UserFragment.java:79)
12-29 01:48:12.758: W/System.err(1982): at com.example.androidchat.UserFragment$Load.doInBackground(UserFragment.java:1)
12-29 01:48:12.768: W/System.err(1982): at android.os.AsyncTask$2.call(AsyncTask.java:288)
12-29 01:48:12.778: W/System.err(1982): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-29 01:48:12.778: W/System.err(1982): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
12-29 01:48:12.788: W/System.err(1982): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
12-29 01:48:12.798: W/System.err(1982): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
12-29 01:48:12.808: W/System.err(1982): at java.lang.Thread.run(Thread.java:841)
12-29 01:48:12.818: W/System.err(1982): Caused by: java.net.ConnectException: failed to connect to /10.0.2.2 (port 8080): connect failed: ETIMEDOUT (Connection timed out)
12-29 01:48:12.848: W/System.err(1982): at libcore.io.IoBridge.connect(IoBridge.java:114)
12-29 01:48:12.858: W/System.err(1982): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
12-29 01:48:12.868: W/System.err(1982): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
12-29 01:48:12.878: W/System.err(1982): at java.net.Socket.connect(Socket.java:843)
12-29 01:48:12.888: W/System.err(1982): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
12-29 01:48:12.898: W/System.err(1982): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
12-29 01:48:12.908: W/System.err(1982): ... 15 more
12-29 01:48:12.918: W/System.err(1982): Caused by: libcore.io.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
12-29 01:48:12.938: W/System.err(1982): at libcore.io.Posix.connect(Native Method)
12-29 01:48:12.948: W/System.err(1982): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
12-29 01:48:12.958: W/System.err(1982): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
12-29 01:48:12.968: W/System.err(1982): at libcore.io.IoBridge.connect(IoBridge.java:112)
12-29 01:48:12.968: W/System.err(1982): ... 20 more
request.js
var request = require('request');
var mysql = require('mysql');
var connection = mysql.createConnection(
{
host : 'localhost',
user : 'root',
password : '',
database : 'chat',
}
);
connection.connect();
exports.login = function(name,mobno,reg_id,callback) {
var data = {
name : name,
mobno : mobno,
reg_id : reg_id
};
var que = "SELECT * from users WHERE mobno =" + mobno;
var query = connection.query(que, function(err, rows)
{
if(rows.length == 0){
var query = connection.query("INSERT INTO users set ? ",data, function(err, rows)
{
callback({'response':"Sucessfully Registered"});
});
}else {
callback({'response':"User already Registered"});
}
});
}
exports.getuser = function(mobno,callback) {
var query = connection.query("SELECT * from users", function(err, rows)
{
if(rows.length == 0){
callback({'response':"No Users Registered"});
}else {
callback(removeUser(rows, mobno));
}
});
}
exports.removeuser = function(mobno,callback) {
var que = "DELETE FROM users WHERE mobno =" + mobno;
var query = connection.query(que, function(err, rows)
{
if(!err){
callback({'response':"Removed Sucessfully"});
}else{
callback({'response':"Error"});
}
});
}
exports.send = function(fromn,fromu,to,msg,callback) {
var que = "SELECT * from users WHERE mobno =" + to;
var query = connection.query(que, function(err, rows)
{
if(rows.length == 0){
callback({'response':"Failure"});
}else {
var to_id = rows[0].reg_id;
var name = rows[0].name;
request(
{ method: 'POST',
uri: 'https://android.googleapis.com/gcm/send',
headers: {
'Content-Type': 'application/json',
'Authorization':'xxxxxxx'
},
body: JSON.stringify({
"registration_ids" : [to_id],
"data" : {
"msg":msg,
"fromu":fromu,
"name":fromn
},
"time_to_live": 108
})
}
, function (error, response, body) {
callback({'response':"Success"});
}
)
}});
}
function removeUser(arr, val) {
for(var i=0; i<arr.length; i++) {
if(arr[i].mobno == val) {
arr.splice(i, 1);
return arr;
break;
}
}
}