本文介绍了AppCompatActivity中的setListAdapter的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有具有listArray
和extends AppCompatActivity
功能的程序,但是我的代码有错误
I have program with feature listArray
with extends AppCompatActivity
but have error in my code
我的代码
NewsActivity
NewsActivity
public class NewsActivity extends AppCompatActivity {
Toolbar toolbar;
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products = "http://localhost/update.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "updatedzc";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "name";
private static final String TAG_VERSION = "version";
private static final String TAG_DESC = "description";
// products JSONArray
JSONArray products = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_news);
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
}
// Response from Edit Product Activity
@Override
public 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 LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(NewsActivity.this);
pDialog.setMessage("Loading News. Please wait...");
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>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Products: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_PRODUCTS);
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_PID);
String name = c.getString(TAG_NAME);
String version = c.getString(TAG_VERSION);
String description = c.getString(TAG_DESC);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
map.put(TAG_VERSION, version);
map.put(TAG_DESC, description);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
Toast.makeText(getApplicationContext(), "doesn't have news now", Toast.LENGTH_SHORT).show();
}
} 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(
NewsActivity.this, productsList,
R.layout.list_item, new String[] { TAG_PID,
TAG_NAME, TAG_VERSION, TAG_DESC},
new int[] { R.id.pid, R.id.name, R.id.timestamp, R.id.txtStatusMsg });
// updating listview
setListAdapter(adapter);
}
});
}
}
}
在此出现错误
setListAdapter(adapter);
这样的错误
Error:(182, 21) error: cannot find symbol method setListAdapter(ListAdapter)
有人可以帮助我吗?
推荐答案
如果您的活动中具有以下ListView
If you have the following ListView in your activity
<ListView android:id="@+id/mainListView"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:layout_below="@id/scan_content"/>
添加类似内容
public ListView mainListView;
转到NewsActivity并替换
to NewsActivity and replace
setListAdapter(adapter);
与
mainListView = (ListView) findViewById(R.id.mainListView);
mainListView.setAdapter(adapter);
除非我误解了这个问题,否则应该可以解决.
Unless I misunderstand the question, that should work.
这篇关于AppCompatActivity中的setListAdapter的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!