您好我正在尝试使用来自http客户端的数组来填充自定义列表视图这里的代码可以有人请给我一些我做错的提示
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>
三江源
答案 0 :(得分：1)
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);
}
没有理由仅使用整个HashMap实例将一个键映射到一个值。请改用BasicNameValuePair或String []。
您的整个convertStringToStream（）方法可以替换为BasicResponseHandler - 2行代码，实例化并处理响应。实际上，您可以使用BasicResponseHandler来删除更多代码。
http://developer.android.com/reference/org/apache/http/impl/client/BasicResponseHandler.html
虽然，如果你的代码崩溃，这可能更多可能无法修复它（霰弹枪调试是这个术语）。如果您包含堆栈跟踪，我们可以告诉您导致失败的原因。检查show-＆gt; view-＆gt; android-＆gt; logcat