如何从 android 中的 spinner 获取价值？

Question

如何从下拉菜单中获取值并在要发送的新消息正文中使用它们。

以下是我的代码，

 public void onItemSelected(AdapterView<?> parent, View view, int position,
            long id) {
        // On selecting a spinner item
        String label = parent.getItemAtPosition(position).toString();
            // Showing selected spinner item
        Toast.makeText(parent.getContext(), "You selected: " + label,
                Toast.LENGTH_LONG).show();
        }
String phoneNo = editPhoneNum.getText().toString();
             String sms = editSMS.getText().toString();
             try {
                     SmsManager smsManager =    SmsManager.getDefault();
                     smsManager.sendTextMessage(phoneNo, null, sms, null, null);
                     Toast.makeText(getApplicationContext(), "SMS Sent!",Toast.LENGTH_LONG).show();


             }

Answer 1

您好，请看看我们如何做到这一点，我正在向您发送示例。请看这里

   @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            // On selecting a spinner item
            String item = parent.getItemAtPosition(position).toString();

            // Showing selected spinner item
            Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();

        }

完整示例如下所示。

AndroidSpinnerExampleActivity.java

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;

public class AndroidSpinnerExampleActivity extends Activity implements OnItemSelectedListener{
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Spinner element
        Spinner spinner = (Spinner) findViewById(R.id.spinner);

        // Spinner click listener
        spinner.setOnItemSelectedListener(this);

        // Spinner Drop down elements
        List<String> categories = new ArrayList<String>();
        categories.add("Automobile");
        categories.add("Business Services");
        categories.add("Computers");
        categories.add("Education");
        categories.add("Personal");
        categories.add("Travel");

        // Creating adapter for spinner
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);

        // Drop down layout style - list view with radio button
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        // attaching data adapter to spinner
        spinner.setAdapter(dataAdapter);
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        // On selecting a spinner item
        String item = parent.getItemAtPosition(position).toString();

        // Showing selected spinner item
        Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();

    }

    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }

}

主文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:padding="10dip"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

    <!-- Text Label -->
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dip"
        android:text="Category:"
        android:layout_marginBottom="5dp"
    />

    <!-- Spinner Element -->
    <Spinner
        android:id="@+id/spinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:prompt="@string/spinner_title"
    />
</LinearLayout>