android之Spinner控件用法

用法1：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context="com.example.mars_2100_spinner.MainActivity"
    tools:ignore="MergeRootFrame" >
<Spinner android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:id="@+id/SpinnerId"/>
</LinearLayout>

package com.example.mars_2100_spinner;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import android.os.Build;

public class MainActivity extends ActionBarActivity {
    private static final String[] m_arr = {"第一组","第二组","第三组"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Spinner _spin = (Spinner)findViewById(R.id.SpinnerId);
        ArrayAdapter<String> ada = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, m_arr);
        ada.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        _spin.setAdapter(ada);
        _spin.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
            public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3){
                dispToast("选择的是"+m_arr[arg2]);
                arg0.setVisibility(View.VISIBLE);
            }
            public void onNothingSelected(AdapterView<?> arg0){
                //
            }
        });
        /*if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }*/
    }

    public void dispToast(String str){
        Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);
            return rootView;
        }
    }

}

用法2：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context="com.example.mars_2100_spinner.MainActivity"
    tools:ignore="MergeRootFrame" >
<Spinner android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:id="@+id/SpinnerId2"/>
<TextView android:id="@+id/textView1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"/>

<Spinner android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:id="@+id/SpinnerId3"/>
<TextView android:id="@+id/textView2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"/>
</LinearLayout>

package com.example.mars_2100_spinner;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.Activity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.os.Build;

public class Main02Activity extends Activity {
    static final String[] CONSTELLATIONS = new String[] { "白羊座", "金牛座", "双子座",
            "巨蟹座", "狮子座", "处女座", "天枰座", "天蝎座", "射手座", "魔蝎座", "水瓶座", "双鱼座" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main02);

        final TextView txt2 = (TextView) findViewById(R.id.textView1);
        Spinner s1 = (Spinner) findViewById(R.id.SpinnerId2);

        final ArrayAdapter<CharSequence> adapter = ArrayAdapter
                .createFromResource(this, R.array.planets_array,
                        android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        s1.setAdapter(adapter);
        s1.setPrompt("测试");
        s1.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                txt2.setText(adapter.getItem(position).toString());
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
                txt2.setText("没选中的");
            }

        });

        final TextView txt4 = (TextView) findViewById(R.id.textView2);
        Spinner s2 = (Spinner) findViewById(R.id.SpinnerId3);

        ArrayAdapter<CharSequence> adapterC = new ArrayAdapter<CharSequence>(
                this, android.R.layout.simple_spinner_item, CONSTELLATIONS);
        adapterC.setDropDownViewResource(android.R.layout.simple_spinner_item);
        s2.setAdapter(adapterC);
        s2.setOnItemSelectedListener(new OnItemSelectedListener() {
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                txt4.setText(CONSTELLATIONS[position]);
            }

            public void onNothingSelected(AdapterView<?> parent) {
                txt4.setText("没选中的");
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main02, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main02,
                    container, false);
            return rootView;
        }
    }

}

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Mars_2100_Spinner</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>

    <string-array name="planets_array">
        <item>Mercury</item>
        <item>Venus</item>
        <item>Earth</item>
        <item>Mars</item>
        <item>Jupiter</item>
        <item>Saturn</item>
        <item>Uranus</item>
        <item>Neptune</item>
    </string-array>

    <string name="title_activity_main02">Main02Activity</string>

</resources>