程序升级

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

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.decarta.db.MapVersionTable;

/**
* @author Tony Shen
*
*/
public class Main extends Activity {

private MapVersionTable mDB;
private String mapVersion;
private String apkUrl;

private List<RunningAppProcessInfo> process;
private ActivityManager activityMan;
private ProgressBar progressBar;

private final int CHECK_NEW_VERSION = 1;
private final int DOWNLOAD = 2;
private final int INSTALL = 3;
private final int CHECK_APP = 4;
private final int INVOKE_APP = 5;
private final int DOWNLOAD_AGAIN = 6;
private final int INSTALL_AGAIN = 7;

private boolean newVersionFlag = false;
private boolean checkAppFlag = false;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mDB = new MapVersionTable(this);
       
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
       
        progressBar.setIndeterminate(false);
        progressBar.setVisibility(View.VISIBLE);
       
        progressBar.setMax(100); 
        progressBar.setProgress(0);

        checkAppFlag = checkApp();
       
new Thread(new Runnable() {
Message msg = new Message();
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
msg.what = CHECK_NEW_VERSION;
mHandler.sendMessage(msg);

try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (newVersionFlag) {
msg.what = DOWNLOAD;
mHandler.sendMessage(msg);

try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
msg.what = INSTALL;
mHandler.sendMessage(msg);
} else {
msg.what = CHECK_APP;
mHandler.sendMessage(msg);

try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (checkAppFlag) {
msg.what = INVOKE_APP;
mHandler.sendMessage(msg);
} else {
msg.what = DOWNLOAD_AGAIN;
mHandler.sendMessage(msg);

try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
msg.what = INSTALL_AGAIN;
mHandler.sendMessage(msg);
}
}
}
}).start();
       
    }
   
    private Handler mHandler = new Handler() { 
        public void handleMessage(Message msg) { 
            switch(msg.what){ 

            case CHECK_NEW_VERSION: 
                if(!Thread.currentThread().isInterrupted()){//当前线程正在运行
                Toast.makeText(Main.this, "检查更新", Toast.LENGTH_SHORT).show();
                newVersionFlag = checkNewVersion();
                progressBar.setProgress(30);
                } 
                break;
            case DOWNLOAD: 
                if(!Thread.currentThread().isInterrupted()){//当前线程正在运行 
                Toast.makeText(Main.this, "下载更新", Toast.LENGTH_SHORT).show();
                downloadAPK(apkUrl);
                progressBar.setProgress(60);
                } 
                break;
            case INSTALL: 
                if(!Thread.currentThread().isInterrupted()){//当前线程正在运行 
                Toast.makeText(Main.this, "安装更新", Toast.LENGTH_SHORT).show();
                killProcess();
                progressBar.setProgress(100);
                installAPK();
                finish();
                } 
                break;
            case CHECK_APP: 
                if(!Thread.currentThread().isInterrupted()){//当前线程正在运行 
                Toast.makeText(Main.this, "检查应用", Toast.LENGTH_SHORT).show();
//                checkAppFlag = checkApp();
                progressBar.setProgress(60);
                } 
                break;
            case INVOKE_APP: 
                if(!Thread.currentThread().isInterrupted()){//当前线程正在运行 
                Toast.makeText(Main.this, "程序启动", Toast.LENGTH_SHORT).show();
                progressBar.setProgress(100);
                invokeAPK();
                finish();
                } 
                break;
            case DOWNLOAD_AGAIN: 
                if(!Thread.currentThread().isInterrupted()){//当前线程正在运行
                Toast.makeText(Main.this, "下载更新", Toast.LENGTH_SHORT).show();
                progressBar.setProgress(80);
                downloadAPK(apkUrl);
               
                } 
                break;
            case INSTALL_AGAIN: 
                if(!Thread.currentThread().isInterrupted()){//当前线程正在运行 
                Toast.makeText(Main.this, "安装更新", Toast.LENGTH_SHORT).show();
                progressBar.setProgress(100);
                installAPK();
                finish();
                } 
                break;  
           
            default:
            progressBar.setVisibility(View.GONE); 
                Thread.currentThread().interrupt();//中断当前线程. 
                break;
            } 
            super.handleMessage(msg); 
        } 
    };

private boolean checkNewVersion() {
try {
URL url=new URL(AppConfig.SERVLET_URL);
SAXParserFactory factory=SAXParserFactory.newInstance();
factory.setNamespaceAware(true);
factory.setValidating(false);
    SAXParser parser=factory.newSAXParser();
    InputStream is = url.openStream();
    parser.parse(is, new DefaultHandler(){
private String cur="";
private int step;

@Override
public void startDocument() throws SAXException {
step = 0;
}

@Override
public void startElement(String uri, String localName,
String qName, Attributes attributes)
throws SAXException {
cur = localName;
}

@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
String str = new String(ch, start, length).trim();
if (str == null || str.equals(""))
return;
if (cur.equals("url")) {
apkUrl = str;
}
if (cur.equals("map_version")) {
mapVersion = str;
}
}

@Override
public void endElement(String uri, String localName,
String qName) throws SAXException {
step = step + 1;
}

@Override
public void endDocument() throws SAXException {
super.endDocument();
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (diffVersion(mapVersion))
return true;
else
return false;
}

private boolean diffVersion(String mapVersion) {
String lastVersion = mDB.getLastMapVersion();
if (lastVersion == null) {
mDB.setMapVersion(mapVersion);
return true;
}

if (!lastVersion.equals(mapVersion)) {
mDB.setMapVersion(mapVersion);
return true;
}
else
return false;
}

private void downloadAPK(String apkUrl) {
String filePath = "//sdcard//download//" + AppConfig.APKNAME;
URL url = null;
try {
url = new URL(apkUrl);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
InputStream in = con.getInputStream();
File fileOut = new File(filePath);
FileOutputStream out = new FileOutputStream(fileOut);
byte[] bytes = new byte[1024];
int c;
while ((c = in.read(bytes)) != -1) {
out.write(bytes, 0, c);
}
in.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}

private void killProcess() {
activityMan = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
process = activityMan.getRunningAppProcesses();

int len = process.size();
for(int i = 0;i<len;i++) {
if (process.get(i).processName.equals(AppConfig.PKG)) {
android.os.Process.killProcess(process.get(i).pid);
}
}
}

private void installAPK() {
String fileName = getSDPath() +"/download/"+AppConfig.APKNAME;
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive");
startActivity(intent);
}

private void invokeAPK() {
Intent i=new Intent();
i.setComponent(new ComponentName(AppConfig.PKG, AppConfig.CLS));
startActivity(i);
}

private boolean checkApp() {
Intent intent = new Intent(Intent.ACTION_VIEW); 
intent.setClassName("com.android.settings",
        "com.android.settings.InstalledAppDetails");
intent.putExtra("com.android.settings.ApplicationPkgName", 
AppConfig.APKNAME); 
List<ResolveInfo> acts = getPackageManager().queryIntentActivities( 
        intent, 0); 
if (acts.size() > 0)
return true;
else
return false;
}

private String getSDPath() {
File sdDir = null;
boolean sdCardExist = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED); // determine whether sd card is exist
if (sdCardExist) {
sdDir = Environment.getExternalStorageDirectory();// get the root directory
}
return sdDir.toString();
}

@Override
public void finish() {
super.finish();
Thread.currentThread().interrupt();//中断当前线程. 
}

@Override
protected void onDestroy() {
super.onDestroy();
try {
    mDB.close(); // be sure to close
} catch (Exception e) {
}
}
}