android网络连接

必须放在线程里才能执行，晕死了。

 

package com.eric.httpdemo;

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
	String str_url = "http://www.zhangjianghome.net/android/title-select.php";
	private final static int handler_flag = 0x1234;
	private Handler HttpHandler;
	TextView post;

	@SuppressLint("HandlerLeak")
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		post = (TextView) this.findViewById(R.id.post);

		HttpHandler = new Handler() {
			public void handleMessage(Message msg) {
				switch (msg.what) {
				case handler_flag:
					post.setText("文章ID："
							+ getJSONFromString(msg.obj.toString()).optString(
									"ID")
							+ "\n"
							+ "文章标题："
							+ getJSONFromString(msg.obj.toString()).optString(
									"post_title")
							+ "\n"
							+ "发表日期："
							+ getJSONFromString(msg.obj.toString()).optString(
									"post_date")
							+ "\n"
							+ "文章内容："
							+ getJSONFromString(msg.obj.toString()).optString(
									"post_content"));
					break;
				default:
					break;
				}
				super.handleMessage(msg);
			}
		};

		new Thread(new HttpRunnable()).start();
	}

	private String getResultStringHttp(String str_url) {
		try {
			HttpClient httpClient = new DefaultHttpClient();
			HttpGet httpGet = new HttpGet(str_url);
			HttpResponse httpResponse = httpClient.execute(httpGet);
			if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				String strResult = EntityUtils.toString(httpResponse
						.getEntity());
				return strResult;
			} else {
				return null;
			}
		} catch (ClientProtocolException e) {
			e.printStackTrace();
			return null;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	@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;
	}

	class HttpRunnable implements Runnable {
		@Override
		public void run() {
			// TODO Auto-generated method stub
			try {
				do {
					String str_result = getResultStringHttp(str_url);
					Thread.sleep(1000);

					Message msg = Message.obtain();
					msg.what = handler_flag;
					msg.obj = str_result;
					MainActivity.this.HttpHandler.sendMessage(msg);
				} while (Thread.interrupted() == false);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}

	private JSONObject getJSONFromString(String jsonString) {
		try {
			JSONObject jsonObject;
			jsonObject = new JSONObject(jsonString);
			return jsonObject;
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;
		}
	}
}