JSON解析分为以下几个步骤

1.下载url上的所有的json数据

package mars.com;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpDownloader {
	// 根据URL下载文件,前提是这个文件当中的内容是文本,函数的返回值就是文本当中的内容
	// 1.创建一个URL对象
	// 2.通过URL对象,创建一个HttpURLConnection对象
	// 3.得到InputStream
	// 4.从InputStream当中读取数据
	private URL url;

	public String download(String urlStr) {
		StringBuffer sb = new StringBuffer();
		String line = null;
		BufferedReader buffer = null;
		try {
			url = new URL(urlStr);
			HttpURLConnection urlConn = (HttpURLConnection) url
					.openConnection();
			buffer = new BufferedReader(new InputStreamReader(
					urlConn.getInputStream()));
			while ((line = buffer.readLine()) != null) {
				sb.append(line);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				buffer.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}
}

package mars.com;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class DemoMapJSONActivity extends Activity {
	private Button button;
	private TextView show;
	private EditText longitude;
	private EditText latitude;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		button = (Button) findViewById(R.id.location);
		show = (TextView) findViewById(R.id.show);
		longitude = (EditText) findViewById(R.id.longitude);
		latitude = (EditText) findViewById(R.id.latitude);
		button.setOnClickListener(new MyLocationListener());

	}

	class MyLocationListener implements OnClickListener {
		public void onClick(View v) {
			HttpDownloader HTT = new HttpDownloader();
			String strUrl = "http://maps.googleapis.com/maps/api/geocode/json?latlng="
					+ latitude.getText().toString()
					+ ","
					+ longitude.getText().toString()
					+ "&sensor=false&language=zh-CN";
			String jsonData = HTT.download(strUrl);

			StringBuffer buf = new StringBuffer();
			try {
				Map<String, Object> result = parseJson(jsonData);

				List<Map<String, Object>> all = (List<Map<String, Object>>) result
						.get("results");
				Iterator<Map<String, Object>> iterator = all.iterator();
				int i = 0;
				while (iterator.hasNext()) {
					Map<String, Object> map = iterator.next();
					buf.append("\n地址:" + map.get("formatted_address")
							+ "*********" + i++);
					break;
				}
				Map<String, Object> address_components = parseJson(jsonData);
				List<Map<String, Object>> all2 = (List<Map<String, Object>>) address_components
						.get("address_components");
				Iterator<Map<String, Object>> iterator2 = all2.iterator();
				int j = 0;
				while (iterator2.hasNext()) {
					Map<String, Object> map = iterator2.next();
					buf.append("\n地址:" + map.get("long_name") + "*********"
							+ j++);
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
			show.setText(buf);
		}
	}

	private Map<String, Object> parseJson(String data) throws Exception {
		Map<String, Object> allMap = new HashMap<String, Object>();
		JSONObject allData = new JSONObject(data);// 全部的内容变为一个项
		JSONArray jsonArray = allData.getJSONArray("results");// 取出数组
		List<Map<String, Object>> all = new ArrayList<Map<S