软件版本的自动检测及更新

来源：互联网发布：充电宝什么牌子好知乎编辑：程序博客网时间：2024/05/22 03:50

publicclass MainActivity extends FragmentActivity

{

privatestaticfinalintUPDATA_CLIENT = -2; // 更新版本；

privatestaticfinalintNET_ERROR = -1; // 网络错误；

privatestaticfinalintFILE_SIZE = 0; // 文件的大小；

privatestaticfinalintDOWNLOAD_PROGRESS = 1; // 下载的进度；

privatestaticfinalintDOWNLOAD_FINISHED = 2; // 下载完成；

privatestaticfinalintCANCEL_DOWNLOAD = 3; // 取消下载；

privateintfileSize;

privateintdownLoadFileSize;//已经下载的文件的大小；

privateRunnable downloadRunnable = null; //下载线程对象；

public Handlerhandler=new Handler()

{

@Override

publicvoid handleMessage(Message msg)

{

switch(msg.what)

{

caseUPDATA_CLIENT://更新版本

showUpdateInterface();

break;

caseNET_ERROR://网络连接错误

Toast.makeText(MainActivity.this, R.string.net_unavailable, Toast.LENGTH_SHORT).show();

break;

caseFILE_SIZE:

progressDialog.setMax(fileSize);//设置最大值

break;

caseDOWNLOAD_PROGRESS:

progressDialog.setProgress(downLoadFileSize);

break;

caseCANCEL_DOWNLOAD://取消下载

this.removeCallbacks(downloadRunnable);

Log.i("run",""+downloadRunnable);

break;

caseDOWNLOAD_FINISHED://下载完成

progressDialog.dismiss();

if(file!=null){

Uri uri=Uri.fromFile(file);

//安装的Intent对象

IntentinstallIntent=new Intent(Intent.ACTION_VIEW);

installIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

installIntent.setDataAndType(uri,"application/vnd.android.package-archive");

startActivity(installIntent);

}

break;

}

};

protectedvoid onCreate(Bundle savedInstanceState){

………..

newCheckVersionThread().start();

}

//显示更新对话框

privatevoidshowUpdateInterface()

{

newAlertDialog.Builder(this)

.setTitle(R.string.update_version)

.setMessage(R.string.update_notify)

.setNegativeButton(R.string.cancel,null)

.setPositiveButton(R.string.yes,

new DialogInterface.OnClickListener() {

@Override

publicvoidonClick(DialogInterface dialog,int which) {

myApplication.setUpdateInfo(updateInfo);

showDownloadDialog();

}

}).setCancelable(false).create().show();

}

//显示正在下载的对话框

protectedvoidshowDownloadDialog()

{

if(progressDialog!=null)

{

progressDialog=null;

}

progressDialog=new ProgressDialog(this);

//设置进度条风格，风格为长形

progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

progressDialog.setIcon(R.drawable.down_ico);

progressDialog.setTitle(R.string.updatesoftware);

progressDialog.setMessage(this.getString(R.string.downloadingbk));

progressDialog.setProgress(100);

//设置ProgressDialog的进度条是否明确

progressDialog.setIndeterminate(false);

//设置ProgressDialog按退回按键取消

progressDialog.setCanceledOnTouchOutside(false);

//让ProgressDialog显示

progressDialog.show();

downloadRunnable=new DownLoadThread();

new Thread(downloadRunnable).start();

}

class DownLoadThreadimplements Runnable

{

@Override

publicvoid run()

{

Looper.prepare();

//设置为正在执行更新

isUpdating=true;

//在新线程里执行长耗时方法

longTimeMethod();

//执行完毕后给handler发送一个空消息

handler.sendEmptyMessage(0);

Looper.loop();

}

privatevoidlongTimeMethod()

{

try

{

URL url11=new URL(updateInfo.getUrl());

HttpURLConnectionconn=(HttpURLConnection)url11.openConnection();

conn.setConnectTimeout(5000);

conn.setDoInput(true);

InputStream inStream=conn.getInputStream();

//设置下载路径

file=new File(getFilesDir(),"xxx.apk");

//如果想把应用下载到SD卡或外部存储卡上时改为：

//Environment.getExternalStorageDirectory()

BufferedInputStream bis=newBufferedInputStream(inStream);

FileOutputStream fos=newFileOutputStream(file);

//文件的长度

fileSize = 100;

sendMsg(FILE_SIZE);

int len=0;

int actualFileSize=conn.getContentLength();

int rate=0;

byte[] buffer=newbyte[1024];

while((len=bis.read(buffer))!=-1)

{

rate+=len;

downLoadFileSize=(int)(((float)rate/actualFileSize)*100);//下载的百分比

fos.write(buffer,0,len);

sendMsg(DOWNLOAD_PROGRESS);

Thread.sleep(20);

}

fos.close();

sendMsg(DOWNLOAD_FINISHED);

}catch (InterruptedException e)

{

handleException();

} catch(MalformedURLException e)

{

handleException();

} catch (IOExceptione)

{

handleException2();

}

privatevoid sendMsg(int flag)

{

Message msg=new Message();

msg.what=flag;

handler.sendMessage(msg);

}

publicvoidhandleException2()

{

dismissMyDialog();

handler.removeCallbacks(downloadRunnable);

Toast.makeText(MainActivity.this, R.string.downloadfail_oth,0).show();

}

publicvoidhandleException()

{

dismissMyDialog();

handler.removeCallbacks(downloadRunnable);

Toast.makeText(MainActivity.this, R.string.downloadfail,0).show();

}

* 检查版本更新

* 启动新线程

classCheckVersionThreadextends Thread

{

@Override

publicvoid run()

{

InputStreaminputStream;

try

{

/*=======此处更改为服务器存放软件版本信息的URL==============*/

String path="http://jfb.9966.org/gkzs/versionInfo.xml";

URL url=new URL(path);

HttpURLConnectionconn=(HttpURLConnection)url.openConnection();

inputStream=conn.getInputStream();

intcurrentVersion=myApplication.getCurrentVersionCode();

updateInfo=myApplication.getUpdateInfo(inputStream);

if(Integer.parseInt(updateInfo.getVersion())>currentVersion)

{

Message msg=handler.obtainMessage();

msg.what=UPDATA_CLIENT;

handler.sendMessage(msg);

}

}catch(Exception e)

{

Message message=handler.obtainMessage();

message.what=NET_ERROR;

handler.sendMessage(message);

}

MyApplication类中关键代码：

public UpdateInfogetUpdateInfo(InputStreaminStream)throws XmlPullParserException,IOException

{

UpdateInfo updateInfo=null;

XmlPullParserparser=Xml.newPullParser();

parser.setInput(inStream,"utf-8");

inteventType=parser.getEventType();

while(eventType!=XmlPullParser.END_DOCUMENT)

{

switch(eventType)

{

case XmlPullParser.START_DOCUMENT:

updateInfo=new UpdateInfo();

break;

case XmlPullParser.START_TAG:

if("version".equals(parser.getName()))

{

Stringversion=parser.nextText();

updateInfo.setVersion(version);

}elseif("url".equals(parser.getName()))

{

Stringurl=parser.nextText();

updateInfo.setUrl(url);

}elseif("description".equals(parser.getName()))

{

Stringdescription=parser.nextText();

updateInfo.setDescription(description);

}

break;

case XmlPullParser.END_DOCUMENT:

updateInfo=null;

default:

break;

}

eventType=parser.next();

}

returnupdateInfo;

}

注意：需要在AndroidManifest.xml中加以下权限：

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

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