我想解析我从链接下方获取的 JSON
你可以看到我在浏览器中得到了正确的响应，但是我在从我的代码中得到响应时遇到了以下错误:
Logcat 响应:
01-23 11:54:57.415: E/AndroidRuntime(2190): FATAL EXCEPTION: AsyncTask #1
01-23 11:54:57.415: E/AndroidRuntime(2190): java.lang.RuntimeException: An error occured while executing doInBackground()
01-23 11:54:57.415: E/AndroidRuntime(2190): at android.os.AsyncTask$3.done(AsyncTask.java:200)
01-23 11:54:57.415: E/AndroidRuntime(2190): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
01-23 11:54:57.415: E/AndroidRuntime(2190): at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
01-23 11:54:57.415: E/AndroidRuntime(2190): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
01-23 11:54:57.415: E/AndroidRuntime(2190): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
01-23 11:54:57.415: E/AndroidRuntime(2190): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
01-23 11:54:57.415: E/AndroidRuntime(2190): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
01-23 11:54:57.415: E/AndroidRuntime(2190): at java.lang.Thread.run(Thread.java:1019)
01-23 11:54:57.415: E/AndroidRuntime(2190): Caused by: java.lang.IllegalArgumentException: Illegal character in query at index 116: http://maps.googleapis.com/maps/api/directions/json?origin=Chicago,IL&destination=Los+Angeles,CA&waypoints=Joplin,MO|Oklahoma+City,OK&sensor=false
01-23 11:54:57.415: E/AndroidRuntime(2190): at java.net.URI.create(URI.java:776)
01-23 11:54:57.415: E/AndroidRuntime(2190): at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:75)
01-23 11:54:57.415: E/AndroidRuntime(2190): at com.example.gisapp.FirstActivity.connect(FirstActivity.java:155)
01-23 11:54:57.415: E/AndroidRuntime(2190): at com.example.gisapp.FirstActivity$AsynTaskForGettingData.doInBackground(FirstActivity.java:109)
01-23 11:54:57.415: E/AndroidRuntime(2190): at com.example.gisapp.FirstActivity$AsynTaskForGettingData.doInBackground(FirstActivity.java:1)
01-23 11:54:57.415: E/AndroidRuntime(2190): at android.os.AsyncTask$2.call(AsyncTask.java:185)
01-23 11:54:57.415: E/AndroidRuntime(2190): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
01-23 11:54:57.415: E/AndroidRuntime(2190): ... 4 more
01-23 11:55:00.045: E/WindowManager(2190): Activity com.example.gisapp.FirstActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405234a0 that was originally added here
01-23 11:55:00.045: E/WindowManager(2190): android.view.WindowLeaked: Activity com.example.gisapp.FirstActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405234a0 that was originally added here
01-23 11:55:00.045: E/WindowManager(2190): at android.view.ViewRoot.<init>(ViewRoot.java:258)
01-23 11:55:00.045: E/WindowManager(2190): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
01-23 11:55:00.045: E/WindowManager(2190): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
01-23 11:55:00.045: E/WindowManager(2190): at android.view.Window$LocalWindowManager.addView(Window.java:424)
01-23 11:55:00.045: E/WindowManager(2190): at android.app.Dialog.show(Dialog.java:241)
01-23 11:55:00.045: E/WindowManager(2190): at com.example.gisapp.FirstActivity$AsynTaskForGettingData.onPreExecute(FirstActivity.java:95)
01-23 11:55:00.045: E/WindowManager(2190): at android.os.AsyncTask.execute(AsyncTask.java:391)
01-23 11:55:00.045: E/WindowManager(2190): at com.example.gisapp.FirstActivity.onCreate(FirstActivity.java:49)
01-23 11:55:00.045: E/WindowManager(2190): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-23 11:55:00.045: E/WindowManager(2190): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
01-23 11:55:00.045: E/WindowManager(2190): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
01-23 11:55:00.045: E/WindowManager(2190): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
01-23 11:55:00.045: E/WindowManager(2190): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
01-23 11:55:00.045: E/WindowManager(2190): at android.os.Handler.dispatchMessage(Handler.java:99)
01-23 11:55:00.045: E/WindowManager(2190): at android.os.Looper.loop(Looper.java:130)
01-23 11:55:00.045: E/WindowManager(2190): at android.app.ActivityThread.main(ActivityThread.java:3683)
01-23 11:55:00.045: E/WindowManager(2190): at java.lang.reflect.Method.invokeNative(Native Method)
01-23 11:55:00.045: E/WindowManager(2190): at java.lang.reflect.Method.invoke(Method.java:507)
01-23 11:55:00.045: E/WindowManager(2190): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
01-23 11:55:00.045: E/WindowManager(2190): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
01-23 11:55:00.045: E/WindowManager(2190): at dalvik.system.NativeStart.main(Native Method)
这是我的 FirstActivity 代码:
package com.example.gisapp;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLEncoder;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
public class FirstActivity extends Activity {
// Tag Variable to Easily Detect your Activity inside LogCat While you Are
// Placing your Log
static String TAG = "FirstActivity";
// boolean to Mantain the State of Internet Working or Not Default Set to
// true
boolean net = true;
// Progreess Dialogue to Show User when AsyncTask is Doing Work in
// BackGround
ProgressDialog pd;
// String Variable to Store the Data of your Json Response as String
static String result;
String URL = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.firstactivity);
// Execute the AsyncTask
new AsynTaskForGettingData().execute();
}
// For Converting the Given String in the Formate the Website Link otherwise
// you will get illegal Formate Exception cause this String will not be in a
// formate of URL
public static String convertURL(String str) {
String url = null;
try {
url = new String(str.trim().replace(" ", "%20").replace("&", "%26")
.replace(",", "%2c").replace("(", "%28")
.replace(")", "%29").replace("!", "%21")
.replace("=", "%3D").replace("<", "%3C")
.replace(">", "%3E").replace("#", "%23")
.replace("$", "%24").replace("'", "%27")
.replace("*", "%2A").replace("-", "%2D")
.replace(".", "%2E").replace("/", "%2F")
.replace(":", "%3A").replace(";", "%3B")
.replace("?", "%3F").replace("@", "%40")
.replace("[", "%5B").replace("\\", "%5C")
.replace("]", "%5D").replace("_", "%5F")
.replace("`", "%60").replace("{", "%7B")
.replace("|", "%7C").replace("}", "%7D"));
} catch (Exception e) {
e.printStackTrace();
}
return url;
}
// Asynctask To get Data from Server
public class AsynTaskForGettingData extends AsyncTask<Void, Void, Void> {
// After we have Execute AsynTaskForGettingData the First Method That
// Will Called up is onPreExecute()
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
// Show Progress Dialogue to Tell User to Wait For A While untill we
// finishes to get the Data From Server and Parse Json
pd = new ProgressDialog(FirstActivity.this);
pd.setTitle("GISApp");
pd.setMessage("Please Wait..");
pd.show();
}
// After Executing onPreExecute() the Method Will Do work inside
// doInBackground()
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
// URL = convertURL(URL);
StringBuffer sb = new StringBuffer();
sb.append("http://maps.googleapis.com/maps/api/directions/json?origin=Chicago,IL&destination=Los+Angeles,CA&waypoints=Joplin,MO|Oklahoma+City,OK&sensor=false");
URL = sb.toString();
if (connect(URL)) {
try {
JSONObject j_obj = new JSONObject(result);
// msg = j_obj.getString("MESSAGE");
// Log.i(TAG, "Value of MESSAGE" + msg);
/*
* if (msg.equalsIgnoreCase("Password sent")) {
* Toast.makeText( LoginActivity.this,
* "Your Username & Password Has Been Sent to your Email Address"
* , Toast.LENGTH_LONG) .show(); } else if (msg
* .equalsIgnoreCase("fail")) { Toast.makeText(
* LoginActivity.this, "Please Enter Valid Email Address",
* Toast.LENGTH_LONG) .show(); }
*/
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} else {
// msg = "error";
}
return null;
}
// After Finishing Work doInBackground() the Method Will execute its
// onPostExecute method
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
pd.dismiss();
}
}
// Method That Will Check Whether the Internet is Working or Not and If
// Working it will Set the Response inside result Variable.
@SuppressWarnings("finally")
public static boolean connect(String url) {
boolean flag = false;
HttpClient httpclient = new DefaultHttpClient();
// Prepare a request object
HttpGet httpget = new HttpGet(url);
Log.e("url", url);
// Execute the request
HttpResponse response;
try {
// https://api.vkontakte.ru/method/audio.search?uid=163398985&q=akoncount=100&access_token=2a4db0e223f0f5ab23f0f5ab5f23da5680223f023f1f5a3c696b018be9b17b9
response = httpclient.execute(httpget);
response.addHeader("Accept-Language", "zh-CN");
// Examine the response status
Log.i(TAG, response.getStatusLine().toString() + "\n" + response);
// Get hold of the response entity
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
// to worry about connection release
if (entity != null) {
// A Simple JSON Response Read
InputStream instream = entity.getContent();
Log.d(TAG, "---- instream --- " + instream);
result = convertStreamToString(instream);
Log.d(TAG, "---- Result --- " + result);
// now you have the string representation of the HTML request
instream.close();
} else {
Log.d(TAG, "---- Json Activity is --- null ");
}
flag = true;
// net = false;
} catch (Exception e) {
Log.d("Jsomn Activity", "---- Catch --- " + e.toString());
flag = false;
e.printStackTrace();
} finally {
return flag;
}
}
// Method That Will Convert your InputStream to String
private static String convertStreamToString(InputStream is) {
/*
* To convert the InputStream to String we use the
* BufferedReader.readLine() method. We iterate until the BufferedReader
* return null which means there's no more data to read. Each line will
* appended to a StringBuilder and returned as String.
*/
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
Log.d("Jsomn Activity", "---- Result --- " + sb.toString());
return sb.toString();
}
}
我知道我肯定在这里犯了一些愚蠢的错误，我也在这里尝试了很多方法，但无法解决。请帮助我摆脱困境。
提前致谢。
最佳答案
如果包含空格字符，请使用 URLEncoder.encode 对您的网址进行编码:
StringBuffer sb = new StringBuffer();
sb.append("origin=Chicago,IL&destination=Los+Angeles,CA&
waypoints=Joplin,MO|Oklahoma+City,OK&sensor=false");
URL = URLEncoder.encode(sb.toString(), "UTF-8");
String newURL = "http://maps.googleapis.com/maps/api/directions/json?"+URL;
关于android - 从 maps.googleapis.com 获取 JSON 数据时出错，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14479247/