如何对Android的版本进行检测与更新
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一、准备1.检测当前版本的信息AndroidManifest.xml-->manifest-->android:versionName。
2.从服务器获取版本号(版本号存在于xml文件中)并与当前检测到的版本进行匹配,如果不匹配,提示用户进行升级,如果匹配则进入程序主界面。
3.当提示用户进行版本升级时,如果用户点击了确定,系统将自动从服务器上下载并进行自动升级,如果点击取消将进入程序主界面。
二、效果图
三、必要说明
服务器端存储apk文件,同时有version.xml文件便于比对更新。
<?xml version="1.0" encoding="utf-8"?>
<info>
<version>2.0</version>
<url>http://192.168.1.187:8080/mobilesafe.apk</url>
<description>检测到最新版本,请及时更新!</description>
<url_server>http://192.168.1.99/version.xml</url_server>
</info>
通过一个实体类获取上述信息。
package com.android;
public class UpdataInfo
private String version;
private String url;
private String description;
private String url_server;
public String getUrl_server()
return url_server;
public void setUrl_server(String url_server)
this.url_server = url_server;
public String getVersion()
return version;
public void setVersion(String version)
this.version = version;
public String getUrl()
return url;
public void setUrl(String url)
this.url = url;
public String getDescription()
return description;
public void setDescription(String description)
this.description = description;
apk和版本信息地址都放在服务器端的version.xml里比较方便,当然如果服务器端不变动,apk地址可以放在strings.xml里,不过版本号信息是新的,必须放在服务器端,xml地址放在strings.xml。
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, VersionActivity!</string>
<string name="app_name">Version</string>
<string name="url_server">http://192.168.1.99/version.xml</string>
</resources>
不知道读者发现没有,笔者犯了个错误,那就是url_server地址必须放在本地,否则怎么读取version.xml,所以url_server不必在实体类和version里添加,毕竟是现需要version地址也就是url_server,才能够读取version。
三、代码实现
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:orientation="vertical" >
<Button
android:id="@+id/btn_getVersion"
android:text="检查更新"
android:layout_
android:layout_/>
</LinearLayout>
package com.android;
import java.io.InputStream;
import org.xmlpull.v1.XmlPullParser;
import android.util.Xml;
public class UpdataInfoParser
public static UpdataInfo getUpdataInfo(InputStream is) throws Exception
XmlPullParser parser = Xml.newPullParser();
parser.setInput(is, "utf-8");
int type = parser.getEventType();
UpdataInfo info = new UpdataInfo();
while(type != XmlPullParser.END_DOCUMENT )
switch (type)
case XmlPullParser.START_TAG:
if("version".equals(parser.getName()))
info.setVersion(parser.nextText());
else if ("url".equals(parser.getName()))
info.setUrl(parser.nextText());
else if ("description".equals(parser.getName()))
info.setDescription(parser.nextText());
break;
type = parser.next();
return info;
package com.android;
import java.io.File;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class VersionActivity extends Activity
private final String TAG = this.getClass().getName();
private final int UPDATA_NONEED = 0;
private final int UPDATA_CLIENT = 1;
private final int GET_UNDATAINFO_ERROR = 2;
private final int SDCARD_NOMOUNTED = 3;
private final int DOWN_ERROR = 4;
private Button getVersion;
private UpdataInfo info;
private String localVersion;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getVersion = (Button) findViewById(R.id.btn_getVersion);
getVersion.setOnClickListener(new OnClickListener()
@Override
public void onClick(View v)
try
localVersion = getVersionName();
CheckVersionTask cv = new CheckVersionTask();
new Thread(cv).start();
catch (Exception e)
// TODO Auto-generated catch block
e.printStackTrace();
);
private String getVersionName() throws Exception
//getPackageName()是你当前类的包名,0代表是获取版本信息
PackageManager packageManager = getPackageManager();
PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(),
0);
return packInfo.versionName;
public class CheckVersionTask implements Runnable
InputStream is;
public void run()
try
String path = getResources().getString(R.string.url_server);
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setConnectTimeout(5000);
conn.setRequestMethod("GET");
int responseCode = conn.getResponseCode();
if (responseCode == 200)
// 从服务器获得一个输入流
is = conn.getInputStream();
info = UpdataInfoParser.getUpdataInfo(is);
if (info.getVersion().equals(localVersion))
Log.i(TAG, "版本号相同");
Message msg = new Message();
msg.what = UPDATA_NONEED;
handler.sendMessage(msg);
// LoginMain();
else
Log.i(TAG, "版本号不相同 ");
Message msg = new Message();
msg.what = UPDATA_CLIENT;
handler.sendMessage(msg);
catch (Exception e)
Message msg = new Message();
msg.what = GET_UNDATAINFO_ERROR;
handler.sendMessage(msg);
e.printStackTrace();
Handler handler = new Handler()
@Override
public void handleMessage(Message msg)
// TODO Auto-generated method stub
super.handleMessage(msg);
switch (msg.what)
case UPDATA_NONEED:
Toast.makeText(getApplicationContext(), "不需要更新",
Toast.LENGTH_SHORT).show();
case UPDATA_CLIENT:
//对话框通知用户升级程序
showUpdataDialog();
break;
case GET_UNDATAINFO_ERROR:
//服务器超时
Toast.makeText(getApplicationContext(), "获取服务器更新信息失败", 1).show();
break;
case DOWN_ERROR:
//下载apk失败
Toast.makeText(getApplicationContext(), "下载新版本失败", 1).show();
break;
;
/*
*
* 弹出对话框通知用户更新程序
*
* 弹出对话框的步骤:
* 1.创建alertDialog的builder.
* 2.要给builder设置属性, 对话框的内容,样式,按钮
* 3.通过builder 创建一个对话框
* 4.对话框show()出来
*/
protected void showUpdataDialog()
AlertDialog.Builder builer = new Builder(this);
builer.setTitle("版本升级");
builer.setMessage(info.getDescription());
//当点确定按钮时从服务器上下载 新的apk 然后安装 װ
builer.setPositiveButton("确定", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
Log.i(TAG, "下载apk,更新");
downLoadApk();
);
builer.setNegativeButton("取消", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
// TODO Auto-generated method stub
//do sth
);
AlertDialog dialog = builer.create();
dialog.show();
/*
* 从服务器中下载APK
*/
protected void downLoadApk()
final ProgressDialog pd; //进度条对话框
pd = new ProgressDialog(this);
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMessage("正在下载更新");
pd.show();
new Thread()
@Override
public void run()
try
File file = DownLoadManager.getFileFromServer(info.getUrl(), pd);
sleep(3000);
installApk(file);
pd.dismiss(); //结束掉进度条对话框
catch (Exception e)
Message msg = new Message();
msg.what = DOWN_ERROR;
handler.sendMessage(msg);
e.printStackTrace();
.start();
//安装apk
protected void installApk(File file)
Intent intent = new Intent();
//执行动作
intent.setAction(Intent.ACTION_VIEW);
//执行的数据类型
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
startActivity(intent);
package com.android;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.ProgressDialog;
import android.os.Environment;
public class DownLoadManager
public static File getFileFromServer(String path, ProgressDialog pd) throws Exception
//如果相等的话表示当前的sdcard挂载在手机上并且是可用的
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5000);
//获取到文件的大小
pd.setMax(conn.getContentLength());
InputStream is = conn.getInputStream();
File file = new File(Environment.getExternalStorageDirectory(), "updata.apk");
FileOutputStream fos = new FileOutputStream(file);
BufferedInputStream bis = new BufferedInputStream(is);
byte[] buffer = new byte[1024];
int len ;
int total=0;
while((len =bis.read(buffer))!=-1)
fos.write(buffer, 0, len);
total+= len;
//获取当前下载量
pd.setProgress(total);
fos.close();
bis.close();
is.close();
return file;
else
return null;
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 参考技术A 应在Toast.LENGTH_SHORT).show();后面加上break;最新版本不需要显示更新 参考技术B 设置-关于手机,一般都在这里。 参考技术C 设置,版本
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