我目前陷入了如何動態地向微調器顯示數據的困境。我正在使用 websocket 接收數據并在我的 UI 線程上運行它，我的問題是我的微調器中沒有顯示數據列表。
1 回答
GCT1015
TA貢獻1827條經驗 獲得超4個贊
您應該創建一個ArrayList如下所示的。
ArrayList<String> spinnerArray = new ArrayList<String>();
Spinner 與 Spinner 相關聯Adapter view，因此要在 Spinner 中填充數據，您需要使用adapter. Anadapter是UI組件和數據源之間的橋梁，幫助我們向UI組件填充數據。
只需您可以像下面一樣使用ArrayAdapter（要使用自定義適配器，請參閱此）
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>
(this, android.R.layout.simple_spinner_item,
spinnerArray);
之后，您必須將您的設置設置adapter為spinner如下所示。
spin.setAdapter(spinnerArrayAdapter);
示例：您的代碼應如下所示。
ArrayList<String> spinnerArray;
ArrayAdapter<String> spinnerArrayAdapter
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.popup);
WayPointData = new SubscribedData<>();
final Type WayPointType = new TypeToken<SubscribedData<WayPoint>>() {
}.getType();
// spinner element
spin = (Spinner) findViewById(R.id.spinner);
spinnerArray = new ArrayList<String>();
spinnerArrayAdapter = new ArrayAdapter<String>
(this, android.R.layout.simple_spinner_item,
spinnerArray);
spin.setAdapter(spinnerArrayAdapter);
rosbridge = new RosbridgeListener("ws://10.24.204.231:9090");
rosbridge.setOnDataReceivedListener(new RosbridgeMessageListener() {
/**
* a running thread that when the connection is made the data of the topic will serialize and deserialized java objects
* to (and from) JSON.
* @param msg
*/
@Override
public void onDataReceived(final String msg) {
try {
runOnUiThread( new Runnable() {
@Override
public void run() {
try {
WayPointData = new Gson().fromJson(msg,WayPointType);
// modify below lines like
JSONObject mainObject = new JSONObject(msg); // add msg in JSONObject parameter
JSONObject msgObject = mainObject.getJSONObject("msg"); // get msgObject from main object
JSONArray wayPointJsonArray = msgObject.getJSONArray("waypoints"); // get wayPointJsonAarry from msg object
for (int i = 0; i < wayPointJsonArray.length(); i++) {
JSONObject wayPointJsonObject = wayPointJsonArray.getJSONObject(i);
// Parse name
String name = wayPointJsonObject.getString("name");
WayPoint wayPoint = new WayPoint();
wayPoint.name = name;
// here you have to add name to your spinner array
spinnerArray.add(name)
}
// After all your data added to arraylist you should notify adapter that data set changed
spinnerArrayAdapter.notifyDataSetChanged();
} catch (Exception e) {
e.printStackTrace();
}
}
});
/** a msg that will display once the data is received **/
Log.d("B9T", String.format("Received data: %s", msg));
} catch (Exception e) {
e.printStackTrace();
}
}
});
spin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int p, long id) {
WayPoint wayPoint = (WayPoint) parent.getItemAtPosition(p);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
/** a set of the waypoints popup window **/
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels;
int height = dm.heightPixels;
getWindow().setLayout((int) (width * .6), (int) (height * .6));
}
}
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