现在很多APK都自带自动检测版本及更新，以便用户体验到最新的功能和体验。实现方法分2种情况。
1.Google APP Store上面已经有部署，这种比较简单，在自己的服务器添加一个检查版本更新的页面，返回需要的版本信息，也可以添加描述内容，这样可以在APK显示版本更新的具体内容。新开一个线程检测当前的版本号是否小于最新的version，如果是的话，则开始访问官方地址来更新。代码如下：
/* This Thread checks for Updates in the Background */
private Thread checkUpdate = new Thread() {
public void run() {
try {
URL updateURL = new URL("http://my.company.com/update");
URLConnection conn = updateURL.openConnection();
InputStream is = conn.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayBuffer baf = new ByteArrayBuffer(50);
int current = 0;
while((current = bis.read()) != -1){
baf.append((byte)current);
}
/* Convert the Bytes read to a String. */
final String s = new String(baf.toByteArray());
/* Get current Version Number */
int curVersion = getPackageManager().getPackageInfo("your.app.id", 0).versionCode;
int newVersion = Integer.valueOf(s);
/* Is a higher version than the current already out? */
if (newVersion > curVersion) {
/* Post a Handler for the UI to pick up and open the Dialog */
mHandler.post(showUpdate);
}
} catch (Exception e) {
}
}
};
/* This Runnable creates a Dialog and asks the user to open the Market */
private Runnable showUpdate = new Runnable(){
public void run(){
new AlertDialog.Builder(Test.this)
.setIcon(R.drawable.icon)
.setTitle("Update Available")
.setMessage("An update for is available!\\n\\nOpen Android Market and see the details?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked OK so do some stuff */
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://search?q=pname:your.app.id"));
startActivity(intent);
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Cancel */
}
})
.show();
}
};
}
2.产品没有部署在应用商店，可以在返回数据里添加最新版本APK的下载路径，下载完毕后，执行下列代码进行安装：
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);
}
3.一些类库，参考地址：