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我想用循环填充我的Listview，最近我试图通过对SQL中的数据进行多次调用，以非常低效的方式填充它。当我意识到它的效率有多低时，我开始通过使用数组从一台服务器上获取数据。我无法更改我的代码以使其工作。从数组填充ListView
我需要做的是找到一种循环遍历下面的JSONArray数组（这对我来说不难），但要做到这一点，我需要让我的GetSocietyDataASyncTask返回上面的数组，并找到一种方法将其传递给SocietySearch.java中的OnCreate/done方法（我的代码中的许多社会对象可以忽略，并以某种方式替换为List社团）
现在我相信我已经包含了所有相关代码，但是如果你需要看别的，请不要犹豫，问我。
由Java的从我的数据库接收到的数据是这样的：
[{"society_id":1,"name":"TestName1","email":"[email protected]","description":"TestDes1"},
{"society_id":2,"name":"TestName2","email":"[email protected]","description":"TestDes2"}]
SocietySearch类：
public class SocietySearch extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_society_search);
Society society = new Society(-1, null, null, null);
ServerRequests serverRequest1 = new ServerRequests(SocietySearch.this);
serverRequest1.GetSocietyDataAsyncTask(society, new GetSocietyCallback() {
@Override
public void done(final Society returnedSociety) {
ListView lv = (ListView) findViewById(R.id.ListView);
List<ListViewItem> items = new ArrayList<>();
items.add(new ListViewItem() {{
ThumbnailResource = R.drawable.test;
Title = returnedSociety.socName;
Subtitle = returnedSociety.socDes;
}});
CustomListViewAdapter adapter = new CustomListViewAdapter(SocietySearch.this, items);
lv.setAdapter(adapter);
}
});
}
class ListViewItem {
public int ThumbnailResource;
public String Title;
public String Subtitle;
}
中ServerRequests类相关部分：
public class getSocietyDataAsyncTask extends AsyncTask<Void, Void, Society> {
Society society;
GetSocietyCallback societyCallback;
public getSocietyDataAsyncTask(Society society, GetSocietyCallback societyCallback) {
this.society = society;
this.societyCallback = societyCallback;
}
@Override
protected Society doInBackground(Void... params) {
BufferedReader reader = null;
Society returnedSociety = null;
List<Society> societies = new ArrayList<>();
try {
URL url = new URL(SERVER_ADDRESS + "/getsocietydata.php");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setConnectTimeout(CONNECTION_TIMEOUT);
con.setReadTimeout(CONNECTION_TIMEOUT);
con.setRequestMethod("POST");
con.setDoOutput(true);
StringBuilder sb = new StringBuilder();
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line;
while ((line = reader.readLine()) != null) { //Read until there is something available
sb.append(line + "\n"); //Read and save line by line
}
line = sb.toString(); //Saving complete data received in string
//Check values received in Logcat
Log.i("custom_check", "The values received in the store part are as follows:");
Log.i("custom_check", line);
JSONArray ja = new JSONArray(line);
if (ja != null && ja.length() == 0) {
returnedSociety = null;
} else {
for (int i = 0; i <ja.length(); i++) {
JSONObject json = ja.optJSONObject(i);
//Storing each Json in a variable
int society_id = json.getInt("society_id");
String socName = json.getString("name");
String socEmail = json.getString("email");
String socDes = json.getString("description");
returnedSociety = new Society(society_id, socName, socEmail, socDes);
societies.add(returnedSociety);
}
return returnedSociety;
}
} catch (Exception e) {
e.printStackTrace();
Log.d("Sample", "Error has occurred!\n" + e.toString());
}
finally {
if (reader != null) {
try {
reader.close(); //Closing the
} catch (IOException e) {
e.printStackTrace();
}
}
}
return returnedSociety;
}
@Override
protected void onPostExecute(Society returnedSociety) {
super.onPostExecute(returnedSociety);
progressDialog.dismiss();
societyCallback.done(returnedSociety);
}
}
CustomListViewAdapter.java：
public class CustomListViewAdapter extends BaseAdapter {
LayoutInflater inflater;
List<SocietySearch.ListViewItem> items;
public CustomListViewAdapter(Activity context, List<SocietySearch.ListViewItem> items) {
super();
this.items = items;
this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
//Auto-generated method stub
return items.size(); // TODO Maybe this can be my sql count?
}
@Override
public Object getItem(int position) {
//Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
//Auto-generated method stub
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
//Auto-generated method stub
ListViewItem item = items.get(position);
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.item_row, null);
ImageView test = (ImageView) vi.findViewById(R.id.imgThumbnail);
TextView txtTitle = (TextView) vi.findViewById(R.id.txtTitle);
TextView txtSubTitle = (TextView) vi.findViewById(R.id.txtSubTitle);
test.setImageResource(item.ThumbnailResource);
txtTitle.setText(item.Title);
txtSubTitle.setText(item.Subtitle);
return vi;
}
}
的ListView Layour文件（item_row.xml）：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relativeLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dip">
<ImageView
android:id="@+id/imgThumbnail"
android:layout_width="78dip"
android:layout_height="78dip"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:layout_marginLeft="-3dip"
android:scaleType="centerInside"></ImageView>
<TextView
android:id="@+id/txtTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="6dip"
android:layout_marginTop="6dip"
android:layout_toRightOf="@+id/imgThumbnail"
android:text="TextView"
android:textAppearance="?android:attr/textAppearanceLarge"></TextView>
<TextView
android:id="@+id/txtSubTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/txtTitle"
android:layout_marginLeft="6dip"
android:layout_marginTop="3dip"
android:layout_toRightOf="@+id/imgThumbnail"
android:text="TextView"></TextView>
</RelativeLayout>
一切看起来不错，所以你的问题是什么？ –
用这段代码，我可以在listview中填充单个条目，但不能超过这个。它只适用于最后一个条目。 – kmil