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   源码介绍

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package zz.itcast.mobileSafe.activity;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import zz.itcast.mobileSafe.utils.StreamUtils;

import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

@SuppressWarnings("unused")
public class SplashActivity extends Activity {

	private TextView tv_version;
	private String versionName;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		intiViews();
		tv_version.setText("版本名"   getVersionName());
		checkVersion();
	}

	private void intiViews() {
		tv_version = (TextView) findViewById(R.id.tv_version);
	}

	private String getVersionName() {

		PackageManager packageManager = getPackageManager();
		try {
			PackageInfo packageInfo = packageManager.getPackageInfo(
					getPackageName(), 0);
			versionName = packageInfo.versionName;
			int versionCode = packageInfo.versionCode;
			System.out.println(versionCode "---" versionName);
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		return versionName;
	}

	private void checkVersion() {
		// 进行联网操作，因为是耗时操作，需要放在子线程中去做
		new Thread(new Runnable() {

			@Override
			public void run() {
				try {
					URL url = new URL("http://192.168.149.2:8080/update.json");
					try {
						HttpURLConnection conc = (HttpURLConnection) url
								.openConnection();
						conc.setConnectTimeout(5000);
						conc.setRequestMethod("GET");
						conc.setReadTimeout(5000);
						conc.connect();
						int code = conc.getResponseCode();
						if(code==200){
							//连接成功，获取输入流
							InputStream stream = conc.getInputStream();
							String result = StreamUtils.StreamToString(stream);
							Log.d("网络结果", result);
						}
					} catch (IOException e) {
						e.printStackTrace();
					}
				} catch (MalformedURLException e) {
					e.printStackTrace();
				}
			}
		}).start();
	}
}