30、Splash 开启软件就连接服务器检查是否需要升级

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--------------------------------main.java---------------------------

package com.example.splash;

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

import net.tsz.afinal.FinalHttp;
import net.tsz.afinal.http.AjaxCallBack;

import org.json.JSONException;
import org.json.JSONObject;

import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

protected static final int SHOW_UPDATE_DIALOG = 0;
protected static final int ENTER_HOME = 1;
protected static final int URL_ERROR = 2;
protected static final int NETWORK_ERROR = 3;
protected static final int JSON_ERROR = 4;
private TextView tv_splash_version;
private String description;
private TextView tv_update_info;
/**
* 新版本的下载地址
*/
private String apkurl;
private SharedPreferences sp;

//判斷是否進入首頁
private Handler handler = new Handler() {

@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
switch (msg.what) {
case SHOW_UPDATE_DIALOG:
// 显示升级的对话框
showUpdateDialog();
break;
case ENTER_HOME:
// 进入主页面
enterHome();
break;

case URL_ERROR:// URL错误
enterHome();
Toast.makeText(getApplicationContext(), "URL错误", 0).show();

break;

case NETWORK_ERROR:// 网络异常
enterHome();
Toast.makeText(MainActivity.this, "网络异常", 0).show();
break;

case JSON_ERROR:// JSON解析出错
enterHome();
Toast.makeText(MainActivity.this, "JSON解析出错", 0).show();
break;

default:
break;
}
}

};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sp = getSharedPreferences("config", MODE_PRIVATE);
tv_splash_version = (TextView) findViewById(R.id.tv_splash_version);
tv_splash_version.setText("版本号" + getVersionName());
tv_update_info = (TextView) findViewById(R.id.tv_update_info);
boolean update = sp.getBoolean("update", false); //if你想测试，就把false改为true
if(update){
// 检查升级
checkUpdate();
}else{
//自动升级已经关闭
handler.postDelayed(new Runnable() {

@Override
public void run() {
//进入主页面
enterHome();

}
}, 2000);

}

AlphaAnimation aa = new AlphaAnimation(0.2f, 1.0f);
aa.setDuration(500);
findViewById(R.id.rl_root_splash).startAnimation(aa);
}

/**
* 得到应用程序的版本名称
*/

private String getVersionName() {
// 用来管理手机的APK
PackageManager pm = getPackageManager();

try {
// 得到知道APK的功能清单文件
PackageInfo info = pm.getPackageInfo(getPackageName(), 0);
return info.versionName;
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "";
}

}

/**
* 检查是否有新版本，如果有就升级
*/
private void checkUpdate() {

new Thread() {
public void run() {
// URLhttp://192.168.1.254:8080/updateinfo.html

Message mes = Message.obtain();
long startTime = System.currentTimeMillis();
try {

//連接服務器看是否需要更新
URL url = new URL("http://192.168.137.1:8080/NewsServer/updateinfo.json");
// 联网
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(4000);
int code = conn.getResponseCode();
if (code == 200) {
// 联网成功
InputStream is = conn.getInputStream();
// 把流转成String
String result = StreamTools.readFromStream(is);
// json解析
JSONObject obj = new JSONObject(result);
// 得到服务器的版本信息
String version = (String) obj.get("version");

description = (String) obj.get("description");
apkurl = (String) obj.get("apkurl");

// 校验是否有新版本
if (getVersionName().equals(version)) {
// 版本一致，没有新版本，进入主页面
mes.what = ENTER_HOME;
} else {
// 有新版本，弹出一升级对话框
mes.what = SHOW_UPDATE_DIALOG;

}

}

} catch (MalformedURLException e) {
// TODO Auto-generated catch block
mes.what = URL_ERROR;
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
mes.what = NETWORK_ERROR;
e.printStackTrace();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
mes.what = JSON_ERROR;
} finally {

long endTime = System.currentTimeMillis();
// 我们花了多少时间
long dTime = endTime - startTime;
// 2000
if (dTime < 2000) {
try {
Thread.sleep(2000 - dTime);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

handler.sendMessage(mes);
}

};
}.start();

}

/**
* 弹出升级对话框
*/
protected void showUpdateDialog() {
//this = Activity.this
AlertDialog.Builder builder = new Builder(MainActivity.this);
builder.setTitle("提示升级");
// builder.setCancelable(false);//强制升级
builder.setOnCancelListener(new OnCancelListener() {

@Override
public void onCancel(DialogInterface dialog) {
// TODO Auto-generated method stub
//进入主页面
enterHome();
dialog.dismiss();

}
});
builder.setMessage(description);
builder.setPositiveButton("立刻升级", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// 下载APK，并且替换安装
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// sdcard存在
// afnal
FinalHttp finalhttp = new FinalHttp();
finalhttp.download(apkurl, Environment
.getExternalStorageDirectory().getAbsolutePath()+"/mobilesafe2.0.apk",
new AjaxCallBack<File>() {

@Override
public void onFailure(Throwable t, int errorNo,
String strMsg) {
t.printStackTrace();
Toast.makeText(getApplicationContext(), "下载失败", 1).show();
super.onFailure(t, errorNo, strMsg);
}

@Override
public void onLoading(long count, long current) {
// TODO Auto-generated method stub
super.onLoading(count, current);
tv_update_info.setVisibility(View.VISIBLE);
//当前下载百分比
int progress = (int) (current * 100 / count);
tv_update_info.setText("下载进度："+progress+"%");
}

@Override
public void onSuccess(File t) {
// TODO Auto-generated method stub
super.onSuccess(t);
installAPK(t);
}
/**
* 安装APK
* @param t
*/
private void installAPK(File t) {
Intent intent = new Intent();
intent.setAction("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.setDataAndType(Uri.fromFile(t), "application/vnd.android.package-archive");

startActivity(intent);

}

});
} else {
Toast.makeText(getApplicationContext(), "没有sdcard，请安装上在试",
0).show();
return;
}

}
});
builder.setNegativeButton("下次再说", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.dismiss();
enterHome();// 进入主页面
}
});
builder.show();

}

protected void enterHome() {
Intent intent = new Intent(this, HomeActivity.class);
startActivity(intent);
// 关闭当前页面
finish();

}

}

----------------------------StreamTools.java------------把输入流转换为字符串-----------

package com.example.splash;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamTools {
/**
* @param is 输入流
* @return String 返回的字符串
* @throws IOException
*/
public static String readFromStream(InputStream is) throws IOException{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while((len = is.read(buffer))!=-1){
baos.write(buffer, 0, len);
}
is.close();
String result = baos.toString();
baos.close();
return result;
}
}

----------------------------HomeActivity.java-----------------------

package com.example.splash;

import android.app.Activity;
import android.os.Bundle;

public class HomeActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
}

}

。。。。。。。。。。。。。main.xml。。。。。。。。。

。。。。。。。。。。。/res/layout/activity_home.xml。。。。。。。

、、、、、、、、权限、、、、、、、

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

，，，，，，，，，，，，，，，更新步骤图：

。。。。。。。。。。。。。服务器中的updateinfo.json文件内容：。。。。。

{"version":"2.0","description":"qin,please download","apkurl":"http://192.168.137.1:8080/NewSafe.apk"}

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