[android] 手机卫士欢迎页检测更新详解手机开发

package com.qingguow.mobilesafe; 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 
import org.json.JSONException; 
import org.json.JSONObject; 
import android.app.Activity; 
import android.content.Intent; 
import android.content.pm.PackageInfo; 
import android.content.pm.PackageManager; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.util.Log; 
import android.view.animation.AlphaAnimation; 
import android.widget.TextView; 
import android.widget.Toast; 
import com.qingguow.mobilesafe.utils.StreamTools; 
public class SplashActivity extends Activity { 
private static final String TAG = "SplashActivity"; 
protected static final int ENTER_HOME = 0; 
protected static final int VERSION_UPDATE = 1; 
protected static final int URL_ERROR = 2; 
protected static final int NETWORK_ERROR = 3; 
protected static final int JSON_ERROE = 4; 
private TextView tv_splash_version; 
private String description; 
private String apkurl; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_splash); 
tv_splash_version = (TextView) findViewById(R.id.tv_splash_version); 
tv_splash_version.setText("版本号" + getVersionName()); 
// 检查更新 
        checkVersion(); 
//界面动画 
AlphaAnimation aa=new AlphaAnimation(0.2f, 1.0f); 
aa.setDuration(1000); 
findViewById(R.id.rl_splash_root).setAnimation(aa); 
} 
private Handler handler = new Handler() { 
public void handleMessage(android.os.Message msg) { 
switch (msg.what) { 
case ENTER_HOME: 
enterHome(); 
break; 
case VERSION_UPDATE: 
Toast.makeText(getApplicationContext(), description, 0).show(); 
break; 
case URL_ERROR: 
Toast.makeText(getApplicationContext(), "URL错误", 0).show(); 
enterHome(); 
break; 
case NETWORK_ERROR: 
Toast.makeText(getApplicationContext(), "网络错误", 0).show(); 
enterHome(); 
break; 
case JSON_ERROE: 
Toast.makeText(getApplicationContext(), "JSON解析错误", 0).show(); 
enterHome(); 
break; 
} 
} 
}; 
/** 
* 进入主页 
*/ 
private void enterHome() { 
Intent intent =new Intent(SplashActivity.this,HomeActivity.class); 
startActivity(intent); 
finish(); 
}; 
/** 
* 检查新版本 
*/ 
private void checkVersion() { 
new Thread() { 
public void run() { 
long startTime=System.currentTimeMillis(); 
Message mes = Message.obtain(); 
URL url; 
try { 
url = new URL(getString(R.string.serverurl)); 
HttpURLConnection conn = (HttpURLConnection) url 
.openConnection(); 
conn.setRequestMethod("GET"); 
conn.setConnectTimeout(4000); 
int code = conn.getResponseCode(); 
if (code == 200) { 
InputStream is = conn.getInputStream(); 
String result = StreamTools.readInputStream(is); 
JSONObject json = new JSONObject(result); 
String newVersion = (String) json.get("version"); 
if (newVersion.equals(getVersionName())) { 
// 进入主界面 
mes.what = ENTER_HOME; 
} else { 
// 版本更新 
mes.what = VERSION_UPDATE; 
description=(String) json.get("description"); 
apkurl=(String) json.get("apkurl"); 
} 
} 
} catch (MalformedURLException e) { 
e.printStackTrace(); 
Log.i(TAG, "URL错误"); 
mes.what = URL_ERROR; 
} catch (IOException e) { 
e.printStackTrace(); 
Log.i(TAG, "网络连接错误"); 
mes.what = NETWORK_ERROR; 
} catch (JSONException e) { 
e.printStackTrace(); 
Log.i(TAG, "JSON解析错误"); 
mes.what = JSON_ERROE; 
} finally { 
//延迟效果 
long endTime=System.currentTimeMillis(); 
long dTime=endTime-startTime; 
if(dTime<3000){ 
try { 
Thread.sleep(3000-dTime); 
} catch (InterruptedException e) { 
} 
} 
handler.sendMessage(mes); 
} 
}; 
}.start(); 
} 
// 获得应用版本名称 
private String getVersionName() { 
PackageManager pm = getPackageManager(); 
try { 
PackageInfo info = pm.getPackageInfo(getPackageName(), 0); 
return info.versionName; 
} catch (Exception e) { 
e.printStackTrace(); 
return ""; 
} 
} 
}