Android Spinner(级联 天气预报）

activity_spinner.xml

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

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Spinner
        android:id="@+id/spinner2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <Spinner
        android:id="@+id/spinner3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="TextView" />

</LinearLayout>

SpinnerActivity.java

package com.wangzhu.demospinner;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class SpinnerActivity extends Activity {

    private Spinner spinner1, spinner2, spinner3;
    private TextView textView1;

    private ArrayAdapter<String> adapter1, adapter2, adapter3;
    private List<String> listData1, listData2, listData3;
    private ProgressDialog dialog;

    private String downloadData;

    private MyThread myThread1, myThread2, myThread3, myThread4, myThread5;
    private MyHandler myHandler;
    private String preUri = "http://m.weather.com.cn/data";
    private String uri;

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

        textView1 = (TextView) findViewById(R.id.textView1);
        listData1 = new ArrayList<String>();
        listData2 = new ArrayList<String>();
        listData3 = new ArrayList<String>();

        adapter1 = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, listData1);
        adapter2 = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, listData2);
        adapter3 = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, listData3);

        spinner1 = (Spinner) findViewById(R.id.spinner1);
        spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {

                Log.d("TAG", "spinner1 " + position + "=====" + id);
                uri = preUri + String.format("5/city%02d", position + 1)
                        + ".xml";
                init2();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });
        spinner1.setAdapter(adapter1);

        spinner2 = (Spinner) findViewById(R.id.spinner2);
        spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                Log.d("TAG", "spinner2 " + position + "=====" + id);
                uri = preUri
                        + String.format("5/city%02d",
                                spinner1.getSelectedItemId() + 1)
                        + String.format("%02d", position + 1) + ".xml";
                init3();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });
        spinner2.setAdapter(adapter2);

        spinner3 = (Spinner) findViewById(R.id.spinner3);
        spinner3.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                Log.d("TAG", "spinner3 " + position + "=====" + id);
                uri = preUri
                        + String.format("5/city%02d",
                                spinner1.getSelectedItemId() + 1)
                        + String.format("%02d",
                                spinner2.getSelectedItemId() + 1)
                        + String.format("%02d", position + 1) + ".xml";
                init4();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });
        spinner3.setAdapter(adapter3);

        myHandler = new MyHandler();
        myThread1 = new MyThread(1);
        myThread2 = new MyThread(2);
        myThread3 = new MyThread(3);
        myThread4 = new MyThread(4);
        myThread5 = new MyThread(5);
        init1();
    }

    private void init1() {
        showDialog("温馨提示", "正在加载第一级目录，请稍候。。。");
        uri = "http://m.weather.com.cn/data5/city.xml";
        new Thread(myThread1).start();
    }

    private void init2() {
        showDialog("温馨提示", "正在更新第二级目录，请稍候。。。");
        new Thread(myThread2).start();
    }

    private void init3() {
        showDialog("温馨提示", "正在更新第三季目录，请稍后。。。");
        new Thread(myThread3).start();
    }

    private void init4() {
        showDialog("温馨提示", "正在更新天气，请稍候。。。");
        new Thread(myThread4).start();
    }

    private void init5() {
        showDialog("温馨提示", "正在更新天气，请稍候。。。");
        new Thread(myThread5).start();
    }

    private void showDialog(String title, String msg) {
        dialog = new ProgressDialog(SpinnerActivity.this);
        dialog.setTitle(title);
        dialog.setMessage(msg);
        dialog.show();
    }

    private void download(String uri) {
        downloadData = null;
        try {
            URL url = new URL(uri);
            // 使用HttpURLConnection打开连接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(2000);
            conn.setUseCaches(false);
            if (HttpURLConnection.HTTP_OK == conn.getResponseCode()) {
                InputStream in = conn.getInputStream();
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(in));
                StringBuffer result = new StringBuffer();
                String readLine = null;
                while ((readLine = reader.readLine()) != null) {
                    result.append(readLine);
                }
                // 关闭InputStream
                in.close();
                // 关闭http连接
                conn.disconnect();
                downloadData = result.toString();
            }
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    class MyThread implements Runnable {
        private int flag;

        public MyThread(int flag) {
            this.flag = flag;
        }

        @Override
        public void run() {
            // Looper.prepare();
            download(uri);
            myHandler.sendEmptyMessage(flag);
        }
    }

    class MyHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            Log.d("TAG", uri);
            switch (msg.what) {
            case 1:
                if (null != downloadData) {
                    Log.d("TAG", downloadData);
                    String[] dataArr = downloadData.split(",");
                    for (int i = 0, len = dataArr.length; i < len; i++) {
                        listData1.add(dataArr[i].substring(3));
                    }
                    // adapter1.notifyDataSetChanged();

                    adapter1 = new ArrayAdapter<String>(SpinnerActivity.this,
                            android.R.layout.simple_spinner_item, listData1);
                    adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                    spinner1.setAdapter(adapter1);

                }
                break;
            case 2:
                if (null != downloadData) {
                    Log.d("TAG", downloadData);
                    String[] dataArr = downloadData.split(",");
                    listData2.clear();
                    for (int i = 0, len = dataArr.length; i < len; i++) {
                        listData2.add(dataArr[i].substring(5));
                    }
                    // adapter2.notifyDataSetChanged();

                    adapter2 = new ArrayAdapter<String>(SpinnerActivity.this,
                            android.R.layout.simple_spinner_item, listData2);
                    adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                    spinner2.setAdapter(adapter2);

                }
                break;
            case 3:
                if (null != downloadData) {
                    Log.d("TAG", downloadData);
                    String[] dataArr = downloadData.split(",");
                    listData3.clear();
                    for (int i = 0, len = dataArr.length; i < len; i++) {
                        listData3.add(dataArr[i].substring(7));
                    }
                    // adapter3.notifyDataSetChanged();

                    adapter3 = new ArrayAdapter<String>(SpinnerActivity.this,
                            android.R.layout.simple_spinner_item, listData3);
                    adapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                    spinner3.setAdapter(adapter3);

                }
                break;
            case 4:
                if (null != downloadData) {
                    Log.d("TAG", downloadData);
                    dialog.dismiss();
                    uri = preUri + "/" + downloadData.substring(7) + ".html";
                    init5();
                }
                break;
            case 5:
                if (null != downloadData) {
                    Log.d("TAG", downloadData);
                    textView1.setText(downloadData);
                }
                break;
            }
            dialog.dismiss();
        }
    }
}