我有一个主要活动，onclick将网址发送到另一个活动
如何添加条件，以便在点击特定行时，我可以发送从JSON解析的特定网址
MainActivity.java
public class MainActivity extends Activity {
// url to make request
private static String url = "http://xxxxxxxxxxxx/";
private HashMap<Integer, String> TimeMap = new HashMap<Integer, String>();
List<Item> yourData = new ArrayList<Item>();
ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Instantiating ProgressDialog with onCreate method
progressDialog=new ProgressDialog(MainActivity.this);
new ParsingAsync().execute();
}
private class ParsingAsync extends AsyncTask<Void, Void, Void>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog=ProgressDialog.show(MainActivity.this, "", "Please Wait", true, false);
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
String _response = null;
try
{
HttpClient httpclient = new DefaultHttpClient();
httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
HttpGet request = new HttpGet(url);
HttpResponse response = httpclient.execute(request);
HttpEntity resEntity = response.getEntity();
_response =EntityUtils.toString(resEntity);
JSONObject jsonObject = new JSONObject(_response);
JSONArray first_array = jsonObject.getJSONArray("restaurants");
JSONArray second_array = jsonObject.getJSONArray("RestaurantTimings");
for(int i=0;i<first_array.length();i++)
{
JSONObject c = second_array.getJSONObject(i);
Item item = new Item();
// Storing each json item in variable
int id = c.getInt("_id");
String TIME = c.getString("RestaurantTime");
item.setTime(TIME);
c = first_array.getJSONObject(i);
String NAME=c.getString("restaurantNAME");
item.setName(NAME);
String URL=c.getString("url");
item.setUrl(URL);
yourData.add(item);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
progressDialog.dismiss();
//TextView timedisplay=(TextView) findViewById(R.id.RestaurantTimeID);
ListView yourListView = (ListView) findViewById(R.id.listViewID);
ListAdapter customAdapter = new ListAdapter(MainActivity.this, R.layout.itemlistrow, yourData);
yourListView.setAdapter(customAdapter);
yourListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent i = new Intent(MainActivity.this, RestaurantDesc.class);
i.putExtra("key", "http://54.218.73.244:7002/CopperChimney");
startActivity(i);
}
});
}
}
}
我尝试使用
i.putExtra("key", yourData.get(position).getUrl());
我可以获得第一次点击列表视图的成功数据，但是在第二，第三，.....我得到以下错误
错误
08-25 19:14:57.133: D/dalvikvm(332): GC_EXTERNAL_ALLOC freed 165K, 50% free 2896K/5703K, external 2111K/2137K, paused 107ms
08-25 19:21:47.553: W/dalvikvm(370): threadid=6: spin on suspend #1 threadid=9 (pcf=0)
08-25 19:21:47.553: D/dalvikvm(370): Temporarily moving tid 378 to fg (was 0)
08-25 19:21:47.553: D/dalvikvm(370): Temporarily raised priority on tid 378 (10 -> 0)
08-25 19:21:47.633: W/dalvikvm(370): threadid=6: spin on suspend resolved in 1078 msec
08-25 19:21:47.633: D/dalvikvm(370): Restored policy of 378 to 0
08-25 19:21:47.633: D/dalvikvm(370): Restored priority on 378 to 10
08-25 20:10:30.833: W/dalvikvm(407): threadid=6: spin on suspend #1 threadid=9 (pcf=0)
08-25 20:10:30.833: D/dalvikvm(407): Temporarily moving tid 415 to fg (was 0)
08-25 20:10:30.833: D/dalvikvm(407): Temporarily raised priority on tid 415 (10 -> 0)
08-25 20:10:30.913: W/dalvikvm(407): threadid=6: spin on suspend resolved in 1079 msec
08-25 20:10:30.913: D/dalvikvm(407): Restored policy of 415 to 0
08-25 20:10:30.913: D/dalvikvm(407): Restored priority on 415 to 10
08-25 20:10:35.985: D/dalvikvm(407): GC_EXTERNAL_ALLOC freed 166K, 50% free 2896K/5703K, external 2111K/2137K, paused 85ms
08-25 20:10:46.523: W/System.err(407): org.json.JSONException: No value for CopperChimney
08-25 20:10:46.773: W/System.err(407): at org.json.JSONObject.get(JSONObject.java:354)
08-25 20:10:46.773: W/System.err(407): at org.json.JSONObject.getJSONArray(JSONObject.java:544)
08-25 20:10:46.773: W/System.err(407): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.doInBackground(RestaurantDesc.java:115)
08-25 20:10:46.783: W/System.err(407): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.doInBackground(RestaurantDesc.java:1)
08-25 20:10:46.783: W/System.err(407): at android.os.AsyncTask$2.call(AsyncTask.java:185)
08-25 20:10:46.783: W/System.err(407): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
08-25 20:10:46.783: W/System.err(407): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
08-25 20:10:46.783: W/System.err(407): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
08-25 20:10:46.783: W/System.err(407): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
08-25 20:10:46.783: W/System.err(407): at java.lang.Thread.run(Thread.java:1019)
08-25 20:10:46.793: D/AndroidRuntime(407): Shutting down VM
08-25 20:10:46.793: W/dalvikvm(407): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-25 20:10:46.813: E/AndroidRuntime(407): FATAL EXCEPTION: main
08-25 20:10:46.813: E/AndroidRuntime(407): java.lang.NullPointerException
08-25 20:10:46.813: E/AndroidRuntime(407): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.onPostExecute(RestaurantDesc.java:138)
08-25 20:10:46.813: E/AndroidRuntime(407): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.onPostExecute(RestaurantDesc.java:1)
08-25 20:10:46.813: E/AndroidRuntime(407): at android.os.AsyncTask.finish(AsyncTask.java:417)
08-25 20:10:46.813: E/AndroidRuntime(407): at android.os.AsyncTask.access$300(AsyncTask.java:127)
08-25 20:10:46.813: E/AndroidRuntime(407): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
08-25 20:10:46.813: E/AndroidRuntime(407): at android.os.Handler.dispatchMessage(Handler.java:99)
08-25 20:10:46.813: E/AndroidRuntime(407): at android.os.Looper.loop(Looper.java:123)
08-25 20:10:46.813: E/AndroidRuntime(407): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-25 20:10:46.813: E/AndroidRuntime(407): at java.lang.reflect.Method.invokeNative(Native Method)
08-25 20:10:46.813: E/AndroidRuntime(407): at java.lang.reflect.Method.invoke(Method.java:507)
08-25 20:10:46.813: E/AndroidRuntime(407): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-25 20:10:46.813: E/AndroidRuntime(407): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-25 20:10:46.813: E/AndroidRuntime(407): at dalvik.system.NativeStart.main(Native Method)
08-25 20:10:52.563: I/Process(407): Sending signal. PID: 407 SIG: 9
08-25 20:10:58.774: W/IInputConnectionWrapper(422): showStatusIcon on inactive InputConnection
08-25 20:25:43.273: D/dalvikvm(422): GC_EXTERNAL_ALLOC freed 160K, 49% free 2880K/5639K, external 2082K/2137K, paused 87ms
08-25 20:25:49.403: W/System.err(422): org.json.JSONException: No value for CopperChimney
08-25 20:25:49.473: W/System.err(422): at org.json.JSONObject.get(JSONObject.java:354)
08-25 20:25:49.473: W/System.err(422): at org.json.JSONObject.getJSONArray(JSONObject.java:544)
08-25 20:25:49.483: W/System.err(422): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.doInBackground(RestaurantDesc.java:115)
08-25 20:25:49.483: W/System.err(422): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.doInBackground(RestaurantDesc.java:1)
08-25 20:25:49.483: W/System.err(422): at android.os.AsyncTask$2.call(AsyncTask.java:185)
08-25 20:25:49.483: W/System.err(422): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
08-25 20:25:49.483: W/System.err(422): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
08-25 20:25:49.493: W/System.err(422): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
08-25 20:25:49.493: W/System.err(422): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
08-25 20:25:49.493: W/System.err(422): at java.lang.Thread.run(Thread.java:1019)
08-25 20:25:49.493: D/AndroidRuntime(422): Shutting down VM
08-25 20:25:49.503: W/dalvikvm(422): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-25 20:25:49.513: E/AndroidRuntime(422): FATAL EXCEPTION: main
08-25 20:25:49.513: E/AndroidRuntime(422): java.lang.NullPointerException
08-25 20:25:49.513: E/AndroidRuntime(422): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.onPostExecute(RestaurantDesc.java:138)
08-25 20:25:49.513: E/AndroidRuntime(422): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.onPostExecute(RestaurantDesc.java:1)
08-25 20:25:49.513: E/AndroidRuntime(422): at android.os.AsyncTask.finish(AsyncTask.java:417)
08-25 20:25:49.513: E/AndroidRuntime(422): at android.os.AsyncTask.access$300(AsyncTask.java:127)
08-25 20:25:49.513: E/AndroidRuntime(422): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
08-25 20:25:49.513: E/AndroidRuntime(422): at android.os.Handler.dispatchMessage(Handler.java:99)
08-25 20:25:49.513: E/AndroidRuntime(422): at android.os.Looper.loop(Looper.java:123)
08-25 20:25:49.513: E/AndroidRuntime(422): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-25 20:25:49.513: E/AndroidRuntime(422): at java.lang.reflect.Method.invokeNative(Native Method)
08-25 20:25:49.513: E/AndroidRuntime(422): at java.lang.reflect.Method.invoke(Method.java:507)
08-25 20:25:49.513: E/AndroidRuntime(422): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-25 20:25:49.513: E/AndroidRuntime(422): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-25 20:25:49.513: E/AndroidRuntime(422): at dalvik.system.NativeStart.main(Native Method)
08-25 20:26:51.563: W/dalvikvm(481): threadid=6: spin on suspend #1 threadid=9 (pcf=0)
08-25 20:26:51.563: D/dalvikvm(481): Temporarily moving tid 489 to fg (was 0)
08-25 20:26:51.563: D/dalvikvm(481): Temporarily raised priority on tid 489 (10 -> 0)
08-25 20:26:51.643: W/dalvikvm(481): threadid=6: spin on suspend resolved in 1080 msec
08-25 20:26:51.643: D/dalvikvm(481): Restored policy of 489 to 0
08-25 20:26:51.643: D/dalvikvm(481): Restored priority on 489 to 10
08-25 20:27:48.342: D/dalvikvm(481): GC_EXTERNAL_ALLOC freed 158K, 50% free 2896K/5703K, external 2111K/2137K, paused 134ms
08-25 20:28:07.754: D/dalvikvm(481): GC_FOR_MALLOC freed 353K, 44% free 3770K/6727K, external 2458K/3069K, paused 752ms
08-25 20:28:08.203: D/dalvikvm(481): GC_CONCURRENT freed 1K, 44% free 3770K/6727K, external 2458K/3069K, paused 7ms+16ms
08-25 20:28:08.843: W/System.err(481): org.json.JSONException: No value for CopperChimney
08-25 20:28:08.843: W/System.err(481): at org.json.JSONObject.get(JSONObject.java:354)
08-25 20:28:08.853: W/System.err(481): at org.json.JSONObject.getJSONArray(JSONObject.java:544)
08-25 20:28:08.883: W/System.err(481): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.doInBackground(RestaurantDesc.java:115)
08-25 20:28:08.883: W/System.err(481): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.doInBackground(RestaurantDesc.java:1)
08-25 20:28:08.913: W/System.err(481): at android.os.AsyncTask$2.call(AsyncTask.java:185)
08-25 20:28:08.913: W/System.err(481): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
08-25 20:28:08.913: W/System.err(481): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
08-25 20:28:08.923: W/System.err(481): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
08-25 20:28:08.933: W/System.err(481): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
08-25 20:28:08.943: W/System.err(481): at java.lang.Thread.run(Thread.java:1019)
08-25 20:28:08.943: D/AndroidRuntime(481): Shutting down VM
08-25 20:28:08.943: W/dalvikvm(481): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-25 20:28:08.963: E/AndroidRuntime(481): FATAL EXCEPTION: main
08-25 20:28:08.963: E/AndroidRuntime(481): java.lang.NullPointerException
08-25 20:28:08.963: E/AndroidRuntime(481): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.onPostExecute(RestaurantDesc.java:138)
08-25 20:28:08.963: E/AndroidRuntime(481): at com.project.findmybuffet.RestaurantDesc$ParsingAsync.onPostExecute(RestaurantDesc.java:1)
08-25 20:28:08.963: E/AndroidRuntime(481): at android.os.AsyncTask.finish(AsyncTask.java:417)
08-25 20:28:08.963: E/AndroidRuntime(481): at android.os.AsyncTask.access$300(AsyncTask.java:127)
08-25 20:28:08.963: E/AndroidRuntime(481): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
08-25 20:28:08.963: E/AndroidRuntime(481): at android.os.Handler.dispatchMessage(Handler.java:99)
08-25 20:28:08.963: E/AndroidRuntime(481): at android.os.Looper.loop(Looper.java:123)
08-25 20:28:08.963: E/AndroidRuntime(481): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-25 20:28:08.963: E/AndroidRuntime(481): at java.lang.reflect.Method.invokeNative(Native Method)
08-25 20:28:08.963: E/AndroidRuntime(481): at java.lang.reflect.Method.invoke(Method.java:507)
08-25 20:28:08.963: E/AndroidRuntime(481): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-25 20:28:08.963: E/AndroidRuntime(481): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-25 20:28:08.963: E/AndroidRuntime(481): at dalvik.system.NativeStart.main(Native Method)
我希望我的解释清楚。有任何想法吗？感谢。
答案 0 :(得分：1)
你可以试试这个。改变你的行
i.putExtra("key", "http://54.218.73.244:7002/CopperChimney");
使用
i.putExtra("key", yourData.get(position).getUrl());
修改
不要硬编码"CopperChimney"，而是尝试传递另外一个：
i.putExtra("name", yourData.get(position).getName());
并在RestauranDesc课程中使用它（请记住将其初始化为url变量：
first_array = jsonObject.getJSONArray(name);
答案 1 :(得分：0)
所以你的问题是如何在活动之间转换数据？只需使用Bundle或Intent
答案 2 :(得分：0)
根据您的评论，您在
处有NullPointerExceptionfor(int i=0; i < first_array.length(); i++)
所以first_array为空
为什么它为空？
first_array = jsonObject.getJSONArray("CopperChimney");
您的json没有名为CopperChimney的json数组
restaurants和RestaurantTimings是数组。
{ //表示json对象节点
[ //表示json数组节点
你有
{ // json object node
"restaurants": [ // json array by name restaurants
和
"RestaurantTimings": [ // json array by name RestaurantTimings
所以我在json
中的任何位置都看不到CopperChimney作为json数组
解析
您的一家餐馆名称是CopperChimney
try
{
JSONObject jsonObject = new JSONObject(_response);
JSONArray jarr = jsonObject.getJSONArray("restaurants");
// json array restaurants
for(int i=0;i<jarr.length();i++)
{
JSONObject jb = jarr.getJSONObject(i);
String id = jb.getString("restaurantID");
String name = jb.getString("restaurantNAME"); // restaurants name
Toast.makeText(getApplicationContext(),name, 1000).show();
}
}
catch(Exception e)
{
e.printStacktrace();
}