我是java编程语言的新手，我正在尝试构建一个应用程序。该应用程序必须列出已保存在MySQL数据库中的工作时间列表。我找到了一个示例应用程序，它帮助我从数据库中检索数据并将其放入ListView中。 但现在我们遇到了问题。我想把分隔符放在listview中。
现在，工作时间的日期在ListView的每个项目中。我希望日期只在第一项之上。
我在互联网上搜索了一种方法，但它并没有帮助我。
这是获取数据并将其放入ListView的代码：
public class AllUrenActivity extends ListActivity {
String url_all_uren;
String ip;
String proid;
String uid = MainScreenActivity.uid;
String datum;
String datum1;
ImageView btntoevoegen;
// Progress Dialog
private ProgressDialog pDialog;
TextView tvDatum;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>>urenList;
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_UREN = "uren";
private static final String TAG_TRID = "trid";
private static final String TAG_PROID = "proid";
private static final String TAG_WERKZAAMHEID = "werkzaamheid";
private static final String TAG_TIJD = "tijd";
private static final String TAG_DATUM = "datum";
// products JSONArray
JSONArray uren = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_uren);
SharedPreferences settings = getSharedPreferences("databaseIP", 0);
ip = settings.getString("ip", "").toString();
url_all_uren = ("http://"+ip+"/android_connect/get_all_uren.php");
// Hashmap for ListView
urenList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllUren().execute();
// Get listview
ListView lv = getListView();
// on selecting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String proid = ((TextView) view.findViewById(R.id.tvProid)).getText()
.toString();
String werkzaamheid = ((TextView) view.findViewById(R.id.tvWerkzaamheid)).getText()
.toString();
String trid = ((TextView) view.findViewById(R.id.tvTrid)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
AllProjectsActivity.class);
// sending pid to next activity
in.putExtra(TAG_PROID, proid);
in.putExtra(TAG_TRID, trid);
in.putExtra(TAG_WERKZAAMHEID, werkzaamheid);
// starting new activity and expecting some response back
startActivityForResult(in, 100);
}
});
}
// Response from Edit Product Activity
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllUren extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AllUrenActivity.this);
pDialog.setMessage("Uren laden...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("uid", uid));
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_uren, "GET", params);
// Check your log cat for JSON reponse
Log.d("Uren: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
uren = json.getJSONArray(TAG_UREN);
// looping through All Products
for (int i = 0; i < uren.length(); i++) {
JSONObject c = uren.getJSONObject(i);
// Storing each json item in variable
String trid = c.getString(TAG_TRID);
String proid = c.getString(TAG_PROID);
String werkzaamheid = c.getString(TAG_WERKZAAMHEID);
String datum = c.getString(TAG_DATUM);
String tijd = c.getString(TAG_TIJD);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_TRID, trid);
map.put(TAG_WERKZAAMHEID, werkzaamheid);
map.put(TAG_PROID, proid);
map.put(TAG_TIJD, tijd);
map.put(TAG_DATUM, datum);
// adding HashList to ArrayList
urenList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewProductActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
AllUrenActivity.this, urenList,
R.layout.list_uren, new String[] { TAG_TRID, TAG_PROID, TAG_WERKZAAMHEID, TAG_TIJD, TAG_DATUM},
new int[] { R.id.tvTrid, R.id.tvProid, R.id.tvWerkzaamheid, R.id.tvTijd, R.id.tvDatum });
// updating listview
setListAdapter(adapter);
}
});
}
}
}
list_uren.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/tvTrid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone" />
<!-- Name Label -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/tvDatum"
android:layout_width="269dp"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingLeft="6dip"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="17sp"
android:visibility="visible" />
<ImageView
android:id="@+id/toevoegen"
android:layout_width="25dp"
android:layout_height="25dp"
android:src="@android:drawable/ic_menu_add" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/tvTijd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="6dip"
android:text="8:00-12:00"
android:textSize="17sp"
android:textStyle="bold"
android:visibility="visible" />
<TextView
android:id="@+id/tvProid"
android:layout_width="138dp"
android:layout_height="wrap_content"
android:layout_marginLeft="25dp"
android:paddingLeft="6dip"
android:text="Project"
android:textSize="17sp" />
</LinearLayout>
<TextView
android:id="@+id/tvWerkzaamheid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="6dip"
android:paddingTop="6dip"
android:text="Werkzaamheid"
android:textSize="17sp" />
</LinearLayout>
all_uren.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<!-- Main ListView
Always give id value as list(@android:id/list)
-->
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
获取日期分隔符的最佳方法是什么？谢谢。
答案 0 :(得分：0)
在关闭LinearLayout
之前，在list_uren.xml的末尾添加它 <View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#666666" />
您可以将背景更改为您想要的任何内容。