这是代码：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONArray;
import org.json.JSONObject;
import com.project.locationapp.model.Device;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.Settings.Secure;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class SelectDevice extends Activity implements OnItemSelectedListener {
private Spinner deviceSpinner;
private List<Device> deviceList;
private ArrayAdapter<Device> deviceAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_device);
deviceList = new ArrayList<Device>();
try {
deviceSpinner = (Spinner) findViewById(R.id.select_device_spinner);
deviceAdapter = new DeviceAdapter(this, android.R.layout.simple_spinner_dropdown_item, deviceList);
deviceSpinner.setAdapter(deviceAdapter);
deviceSpinner.setOnItemSelectedListener(this);
DataAsyncTask loadDevices = new DataAsyncTask();
loadDevices.execute(new String[] { WebServiceURL.WEB_SERVICE + WebServiceURL.DEVICES + WebServiceURL.ALL });
} catch (Exception e){
Log.e(TAG, e.getLocalizedMessage(), e);
}
}
@Override
public void onItemSelected(AdapterView<?> a, View v, int position,
long id) {
Log.d(TAG, "called!");
Intent intent = new Intent(this, ViewTrips.class);
intent.putExtra("device_id", deviceAdapter.getItem(position).getId());
startActivity(intent);
}
}
设备适配器类：
import java.util.List;
import com.project.locationapp.model.Device;
import android.content.Context;
import android.widget.ArrayAdapter;
public class DeviceAdapter extends ArrayAdapter<Device> {
public DeviceAdapter(Context context, int textViewResourceId,
List<Device> objects) {
super(context, textViewResourceId, objects);
}
}
活动布局xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SelectDevice" >
<TextView
android:id="@+id/instructions_device_select"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="@string/select_device_instructions"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:layout_marginRight="15dp"
android:layout_marginLeft="15dp" />
<Button
android:id="@+id/start_service_button"
android:layout_below="@id/instructions_device_select"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="thisDevice"
android:text="@string/this_device"
android:layout_marginTop="10dp"
android:layout_marginRight="40dp"
android:layout_marginLeft="40dp" />
<Spinner
android:id="@+id/select_device_spinner"
android:layout_below="@id/start_service_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="@string/select_device"
android:layout_marginTop="20dp"
android:layout_marginLeft="5dp"
android:drawSelectorOnTop = "true" />
</RelativeLayout>
我正在等待将其正常工作后，我将进一步定制DeviceAdapter。
Activity实现OnItemSelectedListener，因此重写onItemSelected(...)，但根本没有被调用。LogCat中没有错误。Spinner在Activity的布局xml中定义，显示和填充都很好。有什么建议可以修复这个问题吗？
谢谢。