HorizontalScrollView从获取服务器数据 [英] HorizontalScrollView fetching data from server
问题描述
我尝试使用这样本code来实现HorizontalScrollView。我有来从服务器上的数据,所以我所做的更改按我的要求,但是我既不获取数据,也没有任何错误,只是空白的活动。我不知道是什么缺少的。
我能够从服务器获取数据,请参见下面的logcat的结果,这里是我的完整code:
MainActivity.java
公共类MainActivity延伸活动{ CenterLockHorizontalScrollview centerLockHorizontalScrollview;
ArrayList的<&演员GT; actorsList;
ActorAdapter适配器; @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_main);
actorsList =新的ArrayList<&演员GT;();
新JSONAsyncTask()执行(http://microblogging.wingnity.com/JSONParsingTutorial/jsonActors); centerLockHorizontalScrollview =(CenterLockHorizontalScrollview)findViewById(R.id.scrollView);
适配器=新ActorAdapter(getApplicationContext(),R.layout.row,actorsList);
centerLockHorizontalScrollview.setAdapter(MainActivity.this,适配器);
}
类JSONAsyncTask扩展的AsyncTask<弦乐,太虚,布尔> { ProgressDialog对话框; @覆盖
在preExecute保护无效(){
super.on preExecute();
对话框=新ProgressDialog(MainActivity.this);
dialog.setMessage(加载中,请稍候);
dialog.setTitle(连接服务器);
dialog.show();
dialog.setCancelable(假);
} @覆盖
保护布尔doInBackground(字符串的URL ...){
尝试{ // ------------------>>
HTTPGET httppost =新HTTPGET(网址[0]);
HttpClient的HttpClient的=新DefaultHttpClient();
HTT presponse响应= httpclient.execute(httppost); //状态行STAT = response.getStatusLine();
。INT状态= response.getStatusLine()的getStatus code(); 如果(状态== 200){
HttpEntity实体= response.getEntity();
字符串数据= EntityUtils.toString(实体);
JSONObject的jsono =新的JSONObject(数据);
JSONArray jarray = jsono.getJSONArray(演员); 的for(int i = 0; I< jarray.length();我++){
的JSONObject对象= jarray.getJSONObject(I) 演员演员=新演员(); actor.setName(object.getString(名字));
Log.d(姓名:object.getString(名字));
actor.setImage(object.getString(图像));
Log.d(图像,object.getString(图像)); actorsList.add(演员);
}
返回true;
} // ------------------>> }赶上(ParseException的E1){
e1.printStackTrace();
}赶上(IOException异常五){
e.printStackTrace();
}赶上(JSONException E){
e.printStackTrace();
}
返回false;
} 保护无效onPostExecute(布尔结果){
dialog.cancel();
adapter.notifyDataSetChanged();
如果(结果==假)
Toast.makeText(getApplicationContext(),无法读取从服务器上的数据,Toast.LENGTH_LONG).show(); }
}}
的logcat
7月10日至1日:28:12.380:I /流程(582):发送信号。 PID:582 SIG:9
七月10日至1日:29:11.280:D / gralloc_goldfish(636):无仿真模拟GPU检测。
七月10日至1日:29:12.979:D /名称:(636):布拉德·皮特
七月10日至1日:29:12.979:D /图片:(636):http://microblogging.wingnity.com/JSONParsingTutorial/brad.jpg
七月10日至1日:29:12.979:D /名称:(636):汤姆·克鲁斯
七月10日至1日:29:12.979:D /图片:(636):http://microblogging.wingnity.com/JSONParsingTutorial/cruise.jpg
七月10日至1日:29:12.979:D /名称:(636):约翰尼·德普
七月10日至1日:29:13.009:D /图片:(636):http://microblogging.wingnity.com/JSONParsingTutorial/johnny.jpg
七月10日至1日:29:13.009:D /名称:(636):安吉丽娜·朱莉
七月10日至1日:29:13.019:D /图片:(636):http://microblogging.wingnity.com/JSONParsingTutorial/jolie.jpg
七月10日至1日:29:13.019:D /名称:(636):汤姆·汉克斯
七月10日至1日:29:13.019:D /图片:(636):http://microblogging.wingnity.com/JSONParsingTutorial/tom.jpg
七月10日至1日:29:13.019:D /名称:(636):威尔·史密斯
七月10日至1日:29:13.019:D /图片:(636):http://microblogging.wingnity.com/JSONParsingTutorial/will.jpg
您要设置适配器的onCreate 方式我的意思是,当任务尚未完成。它应该在 onPostExecute 方式
保护无效onPostExecute(布尔结果){
dialog.cancel();
如果(结果==假)
Toast.makeText(getApplicationContext(),无法读取从服务器上的数据,Toast.LENGTH_LONG).show();
如果(actorsList!= NULL){
适配器=新ActorAdapter(getApplicationContext(),R.layout.row,actorsList);
centerLockHorizontalScrollview.setAdapter(MainActivity.this,适配器);
}
adapter.notifyDataSetChanged();
}
}
I am trying to implement HorizontalScrollView using this sample code. I have to fetch data from server, so I have made changes as per my requirement, however I am neither getting data nor any error, just blank activity. I don't know what missing.
I am able to get data from server, see logcat result below and here is my complete code:
MainActivity.java
public class MainActivity extends Activity {
CenterLockHorizontalScrollview centerLockHorizontalScrollview;
ArrayList<Actors> actorsList;
ActorAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
actorsList = new ArrayList<Actors>();
new JSONAsyncTask().execute("http://microblogging.wingnity.com/JSONParsingTutorial/jsonActors");
centerLockHorizontalScrollview = (CenterLockHorizontalScrollview) findViewById(R.id.scrollView);
adapter = new ActorAdapter(getApplicationContext(), R.layout.row, actorsList);
centerLockHorizontalScrollview.setAdapter(MainActivity.this, adapter);
}
class JSONAsyncTask extends AsyncTask<String, Void, Boolean> {
ProgressDialog dialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
dialog = new ProgressDialog(MainActivity.this);
dialog.setMessage("Loading, please wait");
dialog.setTitle("Connecting server");
dialog.show();
dialog.setCancelable(false);
}
@Override
protected Boolean doInBackground(String... urls) {
try {
//------------------>>
HttpGet httppost = new HttpGet(urls[0]);
HttpClient httpclient = new DefaultHttpClient();
HttpResponse response = httpclient.execute(httppost);
// StatusLine stat = response.getStatusLine();
int status = response.getStatusLine().getStatusCode();
if (status == 200) {
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsono = new JSONObject(data);
JSONArray jarray = jsono.getJSONArray("actors");
for (int i = 0; i < jarray.length(); i++) {
JSONObject object = jarray.getJSONObject(i);
Actors actor = new Actors();
actor.setName(object.getString("name"));
Log.d("Name:", object.getString("name"));
actor.setImage(object.getString("image"));
Log.d("Image:", object.getString("image"));
actorsList.add(actor);
}
return true;
}
//------------------>>
} catch (ParseException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return false;
}
protected void onPostExecute(Boolean result) {
dialog.cancel();
adapter.notifyDataSetChanged();
if(result == false)
Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();
}
}
}
Logcat
10-01 07:28:12.380: I/Process(582): Sending signal. PID: 582 SIG: 9
10-01 07:29:11.280: D/gralloc_goldfish(636): Emulator without GPU emulation detected.
10-01 07:29:12.979: D/Name:(636): Brad Pitt
10-01 07:29:12.979: D/Image:(636): http://microblogging.wingnity.com/JSONParsingTutorial/brad.jpg
10-01 07:29:12.979: D/Name:(636): Tom Cruise
10-01 07:29:12.979: D/Image:(636): http://microblogging.wingnity.com/JSONParsingTutorial/cruise.jpg
10-01 07:29:12.979: D/Name:(636): Johnny Depp
10-01 07:29:13.009: D/Image:(636): http://microblogging.wingnity.com/JSONParsingTutorial/johnny.jpg
10-01 07:29:13.009: D/Name:(636): Angelina Jolie
10-01 07:29:13.019: D/Image:(636): http://microblogging.wingnity.com/JSONParsingTutorial/jolie.jpg
10-01 07:29:13.019: D/Name:(636): Tom Hanks
10-01 07:29:13.019: D/Image:(636): http://microblogging.wingnity.com/JSONParsingTutorial/tom.jpg
10-01 07:29:13.019: D/Name:(636): Will Smith
10-01 07:29:13.019: D/Image:(636): http://microblogging.wingnity.com/JSONParsingTutorial/will.jpg
You are setting adapter in onCreate method i mean when task hasn't yet completed. it should be in onPostExecute method
protected void onPostExecute(Boolean result) {
dialog.cancel();
if(result == false)
Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();
if(actorsList != null) {
adapter = new ActorAdapter(getApplicationContext(), R.layout.row, actorsList);
centerLockHorizontalScrollview.setAdapter(MainActivity.this, adapter);
}
adapter.notifyDataSetChanged();
}
}
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