Android应用程序：JSON数组从网页到列表视图
问题描述：
我只是试图让下面的格式简单的JSON数组：[COUNTRY2，COUNTRY3，国家1]从Web，然后使用该数组在我的Android应用程序列表视图。我不是停留在如何让这个JSON数组，我是如何得到它变成在应用程序列表视图只是糊涂了。
I'm just trying to get a simple JSON array in the following format: ["Country1","Country2","Country3"] from the web and then use that array as a listview in my android app. I'm not stuck on how to make this JSON array, i'm just confused on how to get it into a listview in the app.
我已经尝试了一些不同的教程，但他们没有使用相同的布局，如我的。
I have tried a few different tutorials, but none of them are using the same layout as such as mine.
我的应用程序正在使用viewflipper，保持在视图中的tabbased布局在任何时候整个应用程序，因此没有教程似乎与我的布局中工作。
My app is using a viewflipper, to keep a tabbased layout in view at all times throughout the app, therefore none of the tutorials seem to be working with my layout.
任何帮助很多AP preciated。
Any help is much appreciated.
编辑：
下面是一些code，是的，我想从Web服务解析和列表视图中显示它。
Here's some code, yes i want to parse it from a web service and display it in a listview.
public class Activity extends TabActivity implements OnClickListener {
Button doSomething;
TabHost tabHost;
ViewFlipper flipper;
ListView listview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tablayout_1);
doSomething = (Button) findViewById(R.id.btn_do_something);
doSomething.setOnClickListener(this);
flipper = (ViewFlipper) findViewById(R.id.layout_tab_one);
listview = (ListView) findViewById(R.id.listview);
@SuppressWarnings("unchecked")
ListAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,fetchTwitterPublicTimeline());
//ListAdapter adapter = new SimpleAdapter(this, this.fetchTwitterPublicTimeline() , R.layout.main, new int[] { R.id.item_title, R.id.item_subtitle });
listview.setAdapter(adapter);
flipper.setOnClickListener(this);
String tabname1 = getString(R.string.tabexample_tab1);
String tabname2 = getString(R.string.tabexample_tab2);
String tabname3 = getString(R.string.tabexample_tab3);
String tabname4 = getString(R.string.tabexample_tab4);
tabHost = getTabHost();
tabHost.addTab(tabHost.newTabSpec("tab1").setContent(R.id.layout_tab_one).setIndicator(tabname1));
tabHost.addTab(tabHost.newTabSpec("tab2").setContent(R.id.layout_tab_two).setIndicator(tabname2));
tabHost.addTab(tabHost.newTabSpec("tab3").setContent(R.id.layout_tab_three).setIndicator(tabname3));
tabHost.addTab(tabHost.newTabSpec("tab4").setContent(R.id.layout_tab_four).setIndicator(tabname4));
tabHost.setCurrentTab(0);
listview.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
flipper.showNext();
}});
}
public ArrayList<String> fetchTwitterPublicTimeline()
{
ArrayList<String> listItems = new ArrayList<String>();
try {
URL twitter = new URL(
"JSON.php");
URLConnection tc = twitter.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(
tc.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
JSONArray ja = new JSONArray(line);
for (int i = 0; i < ja.length(); i++) {
JSONObject jo = (JSONObject) ja.get(i);
listItems.add(jo.getString(""));
}
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return listItems;
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
}
更新：我仍然无法得到它的工作，任何想法在下面的code是错误的。
UPDATE: I still can't get it working, any ideas what's wrong in the code below?
public class Activity extends TabActivity implements OnClickListener {
Button doSomething;
TabHost tabHost;
ViewFlipper flipper;
ListView listview;
HttpResponse re;
String json;
JSONObject j;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
//final String TAG = "MainActivity";
//final String URL = "JSON.php";
super.onCreate(savedInstanceState);
setContentView(R.layout.tablayout_1);
final String[] listItems = new String[] { };
/*========================================
// JSON object to hold the information, which is sent to the server
JSONObject jsonObjSend = new JSONObject();
try {
// Add key/value pairs
jsonObjSend.put("key_1", "value_1");
jsonObjSend.put("key_2", "value_2");
// Add a nested JSONObject (e.g. for header information)
JSONObject header = new JSONObject();
header.put("deviceType","Android"); // Device type
header.put("deviceVersion","2.0"); // Device OS version
header.put("language", "es-es"); // Language of the Android client
jsonObjSend.put("header", header);
// Output the JSON object we're sending to Logcat:
Log.i(TAG, jsonObjSend.toString(2));
} catch (JSONException e) {
e.printStackTrace();
}
// Send the HttpPostRequest and receive a JSONObject in return
JSONObject jsonObjRecv = HTTPClient.SendHttpPost(URL, jsonObjSend);
String temp = jsonObjRecv.toString();
/*==============================================*/
doSomething = (Button) findViewById(R.id.btn_do_something);
doSomething.setOnClickListener(this);
flipper = (ViewFlipper) findViewById(R.id.layout_tab_one);
listview = (ListView) findViewById(R.id.listview);
/* try {
JSONArray array = jsonObjRecv.getJSONArray(""); //(JSONArray) new JSONTokener(json).nextValue();
String[] stringarray = new String[array.length()];
for (int i = 0; i < array.length(); i++) {
stringarray[i] = array.getString(i);
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, stringarray);
listview.setAdapter(adapter);
} catch (JSONException e) {
// handle JSON parsing exceptions...
}*/
//@SuppressWarnings("unchecked")
ListAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,fetchTwitterPublicTimeline());
//ListAdapter adapter = new SimpleAdapter(this, this.fetchTwitterPublicTimeline() , R.layout.main, new int[] { R.id.item_title, R.id.item_subtitle });
listview.setAdapter(adapter);
flipper.setOnClickListener(this);
String tabname1 = getString(R.string.tabexample_tab1);
String tabname2 = getString(R.string.tabexample_tab2);
String tabname3 = getString(R.string.tabexample_tab3);
String tabname4 = getString(R.string.tabexample_tab4);
tabHost = getTabHost();
tabHost.addTab(tabHost.newTabSpec("tab1").setContent(R.id.layout_tab_one).setIndicator(tabname1));
tabHost.addTab(tabHost.newTabSpec("tab2").setContent(R.id.layout_tab_two).setIndicator(tabname2));
tabHost.addTab(tabHost.newTabSpec("tab3").setContent(R.id.layout_tab_three).setIndicator(tabname3));
tabHost.addTab(tabHost.newTabSpec("tab4").setContent(R.id.layout_tab_four).setIndicator(tabname4));
tabHost.setCurrentTab(0);
listview.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
flipper.showNext();
}});
}
public ArrayList<String> fetchTwitterPublicTimeline()
{
ArrayList<String> listItems = new ArrayList<String>();
try {
URL twitter = new URL(
"JSON.php");
URLConnection tc = twitter.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(
tc.getInputStream()));
String line = null;
//make sure youe String line is completely filled after that..
if (!line.equals(null) && !line.equals("") && line.startsWith("["))
{
JSONArray jArray = new JSONArray(line);
for (int i = 0; i < jArray.length(); i++)
{
JSONObject jobj = jArray.getJSONObject(i);
// also make sure you get the value from the jsonObject using some key
// like, jobj.getString("country");
listItems.add(jobj.getString(""));
}
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return listItems;
}
/* public ArrayList<String> fetchTwitterPublicTimeline()
{
ArrayList<String> listItems = new ArrayList<String>();
try {
URL twitter = new URL(
"JSON.php");
URLConnection tc = twitter.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(
tc.getInputStream()));
//make sure youe String line is completely filled after that..
if (!line.equals(null) && !line.equals("") && line.startsWith("["))
{
JSONArray jArray = new JSONArray(line);
for (int i = 0; i < jArray.length(); i++)
{
JSONObject jobj = jArray.getJSONObject(i);
// also make sure you get the value from the jsonObject using some key
// like, jobj.getString("country");
listItems.add(jobj.getString(""));
}
}
/* String line;
while ((line = in.readLine()) != null) {
JSONArray ja = new JSONArray(line);
for (int i = 0; i < ja.length(); i++) {
JSONObject jo = (JSONObject) ja.get(i);
listItems.add(jo.getString(""));
}
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return listItems;
}*/
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
}
更新，这里有jArray值由logcat的报道：
Update, here are the values of jArray as reported by Logcat:
16 08-26：49：07.246：VERBOSE /应用程序（472）：jarray值：国家1，COUNTRY2，COUNTRY3]
08-26 16:49:07.246: VERBOSE/app(472): jarray value: ["Country1","Country2","Country3"]
这是正确的值！
答
这工作在一个简单的测试程序，我刚刚创建...
This works in a simple test app I just created...
ListView list = (ListView) findViewById(...);
String json = "[\"Country1\",\"Country2\",\"Country3\"]";
try {
JSONArray array = (JSONArray) new JSONTokener(json).nextValue();
String[] stringarray = new String[array.length()];
for (int i = 0; i < array.length(); i++) {
stringarray[i] = array.getString(i);
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, stringarray);
list.setAdapter(adapter);
} catch (JSONException e) {
// handle JSON parsing exceptions...
}