[英]setOnItemSelectedListener error when using 3rd party library's spinner
[英]using the setOnItemSelectedListener and onNothingSelected with spinner
我只是想知道是否有人可以通過旋轉器實現setOnItemSelectedListener和onNothingSelected事件,從而解決當前面臨的問題。
一旦用戶從微調器中選擇了選項,它將向他們顯示google地名,然后當用戶單擊某個地時,將顯示另一個頁面,稱為details.java,其中包含該地的詳細信息以及mapview。
我認為我在使用這兩個特定選項時均不正確,因此請有人可以幫助我嗎?
public class PlaceActivity extends AppCompatActivity implements
AdapterView.OnItemSelectedListener {
public ArrayList<GetterSetter> myArrayList;
private Toolbar toolbar;
private Spinner spinner;
ListView myList;
private String[] places;
ProgressDialog dialog;
TextView nodata;
PlaceAdapter adapter;
GetterSetter addValues;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_place);
if (!isNetworkAvailable()) {
Toast.makeText(getApplicationContext(), "Enable internet connection and RE-LAUNCH!!",
Toast.LENGTH_LONG).show();
return;
}
myList = (ListView) findViewById(R.id.myList);
toolbar = (Toolbar) findViewById(R.id.tool_bar);
places = getResources().getStringArray(R.array.places);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
setTitle("Title");
spinner = (Spinner) findViewById(R.id.spinnerplaces);
// Create an ArrayAdapter using the string array and a default spinner
ArrayAdapter<CharSequence> listAdapter = ArrayAdapter
.createFromResource(this, R.array.places,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
listAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
spinner.setAdapter(listAdapter);
ArrayAdapter<CharSequence> list = ArrayAdapter.createFromResource(PlaceActivity.this, R.array.places,android.R.layout.simple_spinner_item);
list.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setOnItemSelectedListener(this);
}
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
return activeNetworkInfo != null;
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int itemPosition, long itemId) {
dialog = ProgressDialog.show(this, "", "Please wait", true);
// Google Places Access key and location values.
new readFromGooglePlaceAPI()
.execute("https://maps.googleapis.com/maps/api/place/nearbysearch/json?"
+ "location=53.795984,-1.759398&radius=900&sensor=true&"
+ "key=AIzaSyA7CzOa10AOfBAU9FvaIrVlVyCKzXxiCc0&types="
+ places[itemPosition]);
myList.OnItemSelectedListener(this);
return true;
}
public class readFromGooglePlaceAPI extends AsyncTask<String, Void, String> {
@Override protected String doInBackground(String... param) {
return readJSON(param[0]);
}
protected void onPostExecute(String str) {
myArrayList = new ArrayList<GetterSetter>();
try {
JSONObject root = new JSONObject(str);
JSONArray results = root.getJSONArray("results");
for (int i = 0; i < results.length(); i++) {
JSONObject arrayItems = results.getJSONObject(i);
JSONObject geometry = arrayItems.getJSONObject("geometry");
JSONObject location = geometry.getJSONObject("location");
addValues = new GetterSetter();
addValues.setLat(location.getString("lat"));
addValues.setLon(location.getString("lng"));
addValues.setName(arrayItems.getString("name").toString());
addValues.setRating(arrayItems.getString("rating").toString());
addValues.setVicinity(arrayItems.getString("vicinity").toString());
myArrayList.add(addValues);
Log.d("Before", myArrayList.toString());
}
} catch (Exception e) {
}
System.out
.println("############################################################################");
Log.d("After:", myArrayList.toString());
nodata = (TextView) findViewById(R.id.nodata);
nodata.setVisibility(View.GONE);
adapter = new PlaceAdapter(PlaceActivity.this, R.layout.list_row, myArrayList);
myList.setAdapter(adapter);
adapter.notifyDataSetChanged();
dialog.dismiss();
}
}
public String readJSON(String URL) {
StringBuilder sb = new StringBuilder();
HttpGet httpGet = new HttpGet(URL);
HttpClient client = new DefaultHttpClient();
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
if (statusLine.getStatusCode() == 200) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
} else {
Log.e("JSON", "Couldn't find JSON file");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// no-op
}
我將以下代碼放在哪里。
@Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
Intent details = new Intent(MainActivity.this, Details.class);
details.putExtra("name", myArrayList.get(arg2).getName());
details.putExtra("rating", myArrayList.get(arg2).getRating());
details.putExtra("vicinity", myArrayList.get(arg2).getVicinity());
details.putExtra("lat", myArrayList.get(arg2).getLat());
details.putExtra("lon", myArrayList.get(arg2).getLon());
startActivity(details);
}
您的方向正確。 現在,您具有必需的方法,但已使您的類實現OnItemSelectedListener並將其設置為旋轉器的偵聽器,如下所示:
公共類PlaceActivity擴展AppCompatActivity 實現OnItemSelectedListener {...}
然后將類設置為偵聽器,您可以在此之后添加以下行:spinner =(Spinner)findViewById(R.id.spinnerplaces);
spinner.setOnItemSelectedListener(本);
我建議是這樣的:
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
//If you're wondering, int pos is the position of the item selected (starting with 0)
// what you want onClick
}
您的代碼:
@Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
Intent details = new Intent(MainActivity.this, Details.class);
details.putExtra("name", myArrayList.get(arg2).getName());
details.putExtra("rating", myArrayList.get(arg2).getRating());
details.putExtra("vicinity", myArrayList.get(arg2).getVicinity());
details.putExtra("lat", myArrayList.get(arg2).getLat());
details.putExtra("lon", myArrayList.get(arg2).getLon());
startActivity(details);
}
可以低於微調器的初始化。
希望能幫助到你! 祝好運!
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