【发布时间】：2011-10-06 21:46:26
【问题描述】：
您好，我正在尝试使用来自 http 客户端的数组填充自定义列表视图，这是一个代码，有人可以给我提示一下我做错了什么
package com.capefield.msemakweli;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.SimpleAdapter;
public class viewComms extends ListActivity {
public String names[];
public String commsFromDb[];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.comment_list);
//create http client to gather comments
try{
HttpClient getComment = new DefaultHttpClient();
HttpGet pullComm = new HttpGet();
pullComm.setURI(new URI("http://msemakweli.olalashe.com/getComments.php"));
HttpResponse comments = getComment.execute(pullComm);
if (comments.getStatusLine().getStatusCode() == 200) {
HttpEntity entit = comments.getEntity();
if (entit !=null){
InputStream commStream = entit.getContent();
JSONArray commentAR = new JSONArray(
convertStreamToString(commStream));
if (commentAR.length()==0){
}else{
names = new String[commentAR.length()];
commsFromDb = new String [commentAR.length()];
for (int i = 0; i < commentAR.length(); i++) {
JSONObject OComm = commentAR.getJSONObject(i);
names[i] = OComm.getString("name");
commsFromDb[i] = OComm.getString("comment");
}
ArrayList<HashMap<String, String>> commList = new ArrayList<HashMap<String, String>>();
for (int j=0; j<commentAR.length(); j++){
HashMap<String, String> objComm = new HashMap<String, String>();
objComm.put("name", names[j]);
objComm.put("suggestiom,", commsFromDb[j]);
commList.add(objComm);
SimpleAdapter adapter =new SimpleAdapter(
this,
commList,
R.layout.comment_row,
new String[]{"name","suggestiom,"},
new int[]{R.id.CommName, R.id.CommText}
);
setListAdapter(adapter);
}
}
}
}
} catch (URISyntaxException 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();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
}
}
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();
}
}
return sb.toString();
}
}
这是我运行活动时得到的堆栈跟踪
07-17 10:29:14.713: WARN/System.err(4936): org.json.JSONException: No value for comment
07-17 10:29:14.723: WARN/System.err(4936): at org.json.JSONObject.get(JSONObject.java:354)
07-17 10:29:14.733: WARN/System.err(4936): at org.json.JSONObject.getString(JSONObject.java:510)
07-17 10:29:14.733: WARN/System.err(4936): at com.capefield.msemakweli.viewComms.onCreate(viewComms.java:58)
07-17 10:29:14.733: WARN/System.err(4936): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-17 10:29:14.733: WARN/System.err(4936): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
07-17 10:29:14.733: WARN/System.err(4936): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
07-17 10:29:14.743: WARN/System.err(4936): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
07-17 10:29:14.743: WARN/System.err(4936): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
07-17 10:29:14.743: WARN/System.err(4936): at android.os.Handler.dispatchMessage(Handler.java:99)
07-17 10:29:14.743: WARN/System.err(4936): at android.os.Looper.loop(Looper.java:123)
07-17 10:29:14.743: WARN/System.err(4936): at android.app.ActivityThread.main(ActivityThread.java:4627)
07-17 10:29:14.743: WARN/System.err(4936): at java.lang.reflect.Method.invokeNative(Native Method)
07-17 10:29:14.743: WARN/System.err(4936): at java.lang.reflect.Method.invoke(Method.java:521)
07-17 10:29:14.753: WARN/System.err(4936): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-17 10:29:14.753: WARN/System.err(4936): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-17 10:29:14.753: WARN/System.err(4936): at dalvik.system.NativeStart.main(Native Method)
这里是comment_list.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/android:list"
android:layout_height="wrap_content"
android:layout_width="match_parent"></ListView>
</LinearLayout>
谢谢
【问题讨论】：
标签： android arraylist hashmap adapter android-listview