android 怎么檢查新版本并且更新

在Android中，如何檢測(cè)新版本并進(jìn)行更新？首先，需要在Manifest中獲取當(dāng)前版本的信息。接著，從服務(wù)器獲取版本號(hào)并與當(dāng)前版本進(jìn)行比較，如果不匹配，則提示用戶進(jìn)行升級(jí)。如果用戶點(diǎn)擊確定，系統(tǒng)將自動(dòng)從服務(wù)器下載并進(jìn)行升級(jí)。如果點(diǎn)擊取消，則進(jìn)入程序主界面。

服務(wù)器端存儲(chǔ)apk文件和版本信息，通過(guò)version.xml文件便于比對(duì)更新。version.xml文件示例如下：

<?xml version="1.0" encoding="utf-8"?>

<info>

<version>2.0</version>

<url>http://192.168.1.187:8080/mobilesafe.apk</url>

<description>檢測(cè)到最新版本，請(qǐng)及時(shí)更新！</description>

<url_server>http://192.168.1.99/version.xml</url_server>

</info>

通過(guò)一個(gè)實(shí)體類獲取上述信息。

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務(wù)器端的version.xml里，方便管理。apk地址可以放在strings.xml里，但版本信息必須放在服務(wù)器端。

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 android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.app.ProgressDialog;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

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.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) {

e.printStackTrace();

}

}

});

}

private String getVersionName() throws Exception {

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) {

is = conn.getInputStream();

}

info = UpdataInfoParser.getUpdataInfo(is);

if (info.getVersion().equals(localVersion)) {

Log.i(TAG, "版本號(hào)相同");

Message msg = new Message();

msg.what = UPDATA_NONEED;

handler.sendMessage(msg);

} else {

Log.i(TAG, "版本號(hào)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) {

switch (msg.what) {

case UPDATA_NONEED:

Toast.makeText(getApplicationContext(), "不需要更新", Toast.LENGTH_SHORT).show();

break;

case UPDATA_CLIENT:

showUpdataDialog();

break;

case GET_UNDATAINFO_ERROR:

Toast.makeText(getApplicationContext(), "獲取服務(wù)器更新信息失敗", 1).show();

break;

case DOWN_ERROR:

Toast.makeText(getApplicationContext(), "下載新版本失敗", 1).show();

break;

}

}

};

protected void showUpdataDialog() {

AlertDialog.Builder builder = new Builder(this);

builder.setTitle("版本升級(jí)");

builder.setMessage(info.getDescription());

builder.setPositiveButton("確定", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

Log.i(TAG, "下載apk,更新");

downLoadApk();

}

});

builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

}

});

AlertDialog dialog = builder.create();

dialog.show();

}

protected void downLoadApk() {

final ProgressDialog pd;

pd = new ProgressDialog(this);

pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

pd.setMessage("正在下載更新");

pd.show();

new Thread() {

@Override

public void run() {

try {

File file = DownLoadManager.getFileFromServer(info.getUrl(), pd);

sleep(3000);

installApk(file);

pd.dismiss();

} catch (Exception e) {

Message msg = new Message();

msg.what = DOWN_ERROR;

handler.sendMessage(msg);

e.printStackTrace();

}

}

}.start();

}

protected void installApk(File file) {

Intent intent = new Intent();

intent.setAction(Intent.ACTION_VIEW);

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 {

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setConnectTimeout(5000);

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;

pd.setProgress(total);

}

fos.close();

bis.close();

is.close();

return file;

} else {

return null;

}

}

}

在AndroidManifest.xml中添加必要的權(quán)限：

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

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

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android 怎么檢查新版本并且更新

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