Android应用客户端通常会需要更新，而且根据需求分为普通更新和强制更新。是否强制更新可通过检查更新时从服务器获取的标志位来判断。
public class UpdateManager {
private Context mContext; //上下文
private String apkUrl =
"http://183.232.83.10/dd.myapp.com/16891/" +
"C4F9FF39FAE9184222DC278DC7309611.apk?mkey" +
"=5541c92b6a9cca8d&f=d388&fsname=com.yangmbin" +
".beauty_1.1_2.apk&asr=8eff&p=.apk"; //apk下载地址
private static final String savePath = "/sdcard/updateAPK/"; //apk保存到SD卡的路径
private static final String saveFileName = savePath + "apkName.apk"; //完整路径名
private ProgressBar mProgress; //下载进度条控件
private static final int DOWNLOADING = 1; //表示正在下载
private static final int DOWNLOADED = 2; //下载完毕
private static final int DOWNLOAD_FAILED = 3; //下载失败
private int progress; //下载进度
private boolean cancelFlag = false; //取消下载标志位
private double serverVersion = 2.0; //从服务器获取的版本号
private double clientVersion = 1.0; //客户端当前的版本号
private String updateDescription = "更新描述"; //更新内容描述信息
private boolean forceUpdate = true; //是否强制更新
private AlertDialog alertDialog1, alertDialog2; //表示提示对话框、进度条对话框
/** 构造函数 */
public UpdateManager(Context context) {
this.mContext = context;
}
/** 显示更新对话框 */
public void showNoticeDialog() {
//如果版本最新，则不需要更新
if (serverVersion <= clientVersion)
return;
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle("发现新版本 ：" + serverVersion);
dialog.setMessage(updateDescription);
dialog.setPositiveButton("现在更新", new OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
arg0.dismiss();
showDownloadDialog();
}
});
//是否强制更新
if (forceUpdate == false) {
dialog.setNegativeButton("待会更新", new OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
arg0.dismiss();
}
});
}
alertDialog1 = dialog.create();
alertDialog1.setCancelable(false);
alertDialog1.show();
}
/** 显示进度条对话框 */
public void showDownloadDialog() {
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle("正在更新");
final LayoutInflater inflater = LayoutInflater.from(mContext);
View v = inflater.inflate(R.layout.softupdate_progress, null);
mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
dialog.setView(v);
//如果是强制更新，则不显示取消按钮
if (forceUpdate == false) {
dialog.setNegativeButton("取消", new OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
arg0.dismiss();
cancelFlag = false;
}
});
}
alertDialog2 = dialog.create();
alertDialog2.setCancelable(false);
alertDialog2.show();
//下载apk
downloadAPK();
}
/** 下载apk的线程 */
public void downloadAPK() {
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
try {
URL url = new URL(apkUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.connect();
int length = conn.getContentLength();
InputStream is = conn.getInputStream();
File file = new File(savePath);
if(!file.exists()){
file.mkdir();
}
String apkFile = saveFileName;
File ApkFile = new File(apkFile);
FileOutputStream fos = new FileOutputStream(ApkFile);
int count = 0;
byte buf[] = new byte[1024];
do{
int numread = is.read(buf);
count += numread;
progress = (int)(((float)count / length) * 100);
//更新进度
mHandler.sendEmptyMessage(DOWNLOADING);
if(numread <= 0){
//下载完成通知安装
mHandler.sendEmptyMessage(DOWNLOADED);
break;
}
fos.write(buf, 0, numread);
}while(!cancelFlag); //点击取消就停止下载.
fos.close();
is.close();
} catch(Exception e) {
mHandler.sendEmptyMessage(DOWNLOAD_FAILED);
e.printStackTrace();
}
}
}).start();
}
/** 更新UI的handler */
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch (msg.what) {
case DOWNLOADING:
mProgress.setProgress(progress);
break;
case DOWNLOADED:
if (alertDialog2 != null)
alertDialog2.dismiss();
installAPK();
break;
case DOWNLOAD_FAILED:
Toast.makeText(mContext, "网络断开，请稍候再试", Toast.LENGTH_LONG).show();
break;
default:
break;
}
}
};
/** 下载完成后自动安装apk */
public void installAPK() {
File apkFile = new File(saveFileName);
if (!apkFile.exists()) {
return;
}
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(Uri.parse("file://" + apkFile.toString()), "application/vnd.android.package-archive");
mContext.startActivity(intent);
}
}对话框中进度条用到的布局：softupdate_progress.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ProgressBar
android:id="@+id/update_progress"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
style="?android:attr/progressBarStyleHorizontal" />
</RelativeLayout>使用方法：
//这里来检测版本是否需要更新
mUpdateManager = new UpdateManager(this);
mUpdateManager.showNoticeDialog();检查更新通常是在初始化的时候，请求服务器检查版本，如果有更新，则把相关url、是否强制更新和版本号等信息通过showNoticeDialog的参数传递进去，做相关的初始化即可。