作者：程序员小冰，CSDN博客：http://blog.csdn.net/qq_21376985，转载请说明出处。
给大家介绍个东西，MarkDown真的超级超级好用。哈哈。好了，
正题内容如下：
先说明，此文章是教程详解，而不是直接拿来用的Demo，想要Demo的
朋友可以在下面留言或者私信，看到有要的朋友会做一个Demo。下面
文章是教大家理解这个内容。
先看一下效果：
1，检测更新
/*
* 从服务器端读取相关信息
*/
private String getInfoFromServer(String url) throws ClientProtocolException,
IOException
{
// sb 是从updateServerUrl上面读取到的内容
StringBuffer sb = new StringBuffer();
HttpClient httpClient = new DefaultHttpClient();
HttpParams httpParams = httpClient.getParams();
// 设置网络超时参数
HttpConnectionParams.setConnectionTimeout(httpParams, 3000);
HttpConnectionParams.setSoTimeout(httpParams, 5000);
HttpResponse response = httpClient.execute(new HttpGet(url));
HttpEntity entity = response.getEntity();
if (entity != null)
{
BufferedReader reader = new BufferedReader(new InputStreamReader(
entity.getContent(), "UTF-8"), 8192);
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "
");
}
reader.close();
}
else
{
// 如果网络不通则默认初始版本
sb.append("1");
}
Log.i("getInfoFromServer", sb.toString().trim());
return sb.toString().trim();
}
/**
* 获取软件版本号
*
* @param context
* @return
*/
private float getVersionCode(Context context)
{
float versionCode = 0;
try
{
// 获取软件版本号，对应AndroidManifest.xml下android:versionCode
versionCode = Float.valueOf(context.getPackageManager().getPackageInfo(
mContext.getPackageName(), 0).versionName);
}
catch (NameNotFoundException e)
{
e.printStackTrace();
}
return versionCode;
}
private void showUpdateDialog()
{
if (mDialog == null)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("提示更新");
builder.setMessage("有最新版本可更新，是否下载更新");
builder.setPositiveButton("更新", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
// 开启服务进行更新
Intent intent = new Intent();
intent.setClass(MainActivity.this, UpgradeService.class);
bindService(intent, conn, Context.BIND_AUTO_CREATE);
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
if (mDialog.isShowing())
{
mDialog.dismiss();
}
}
});
mDialog = builder.create();
}
mDialog.show();
}
2，创建通知,带有自定义视图通知
1）自定义布局：
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="@+id/image"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_marginTop="2dp"
android:background="@drawable/ic_launcher" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:orientation="horizontal" >
<TextView
android:id="@+id/dw_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:text="xxxx.apk"
android:textSize="18sp"
android:textColor="#4b8df9" />
<TextView
android:id="@+id/tv_progress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center"
android:minWidth="60dp"
android:textSize="18sp"
android:textColor="#4b8df9" />
</LinearLayout>
<ProgressBar
android:id="@+id/progressbar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_marginRight="4dp"
android:layout_marginTop="3dp"
android:max="100"
android:progress="0"
android:text="xxxx.apk" />
</LinearLayout>
</LinearLayout>
2） 通知处理：
mNotificationManager = (NotificationManager)
getSystemService(android.content.Context.NOTIFICATION_SERVICE);
/**
* 创建通知
*/
private void setUpNotification()
{
CharSequence tickerText = getString(R.string.download_begin);
long when = System.currentTimeMillis();
mNotification = new Notification();
mNotification.icon = R.drawable.ic_launcher;
mNotification.tickerText = tickerText;
mNotification.when = when;
// 放置在"正在运行"栏目中
mNotification.flags = Notification.FLAG_ONGOING_EVENT;
RemoteViews contentView = new RemoteViews(getPackageName(),
R.layout.download_notification_layout);
contentView.setTextViewText(R.id.dw_name,
getString(R.string.tip_apk_download));
// 指定个性化视图
mNotification.contentView = contentView;
Intent intent = new Intent(this, MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent,
PendingIntent.FLAG_NO_CREATE);
// 指定内容意图
mNotification.contentIntent = contentIntent;
mNotificationManager.notify(NOTIFY_ID, mNotification);
}
通知修改：
if (rate <= 100)
{
RemoteViews contentview = mNotification.contentView;
contentview.setTextViewText(R.id.tv_progress, rate + "%");
contentview.setProgressBar(R.id.progressbar, 100, rate, false);
}
else
{
// 下载完毕后变换通知形式
mNotification.flags = Notification.FLAG_AUTO_CANCEL;
// mNotification.contentView = null;
stopSelf();
}
mNotificationManager.notify(NOTIFY_ID, mNotification);
3，下载逻辑处理
private int lastRate = 0;
private Runnable mdownApkRunnable = new Runnable()
{
@Override
public void run()
{
try
{
// 获取下载地址
URL url = new URL(DOWNLOAD_APK_URL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.connect();
int length = conn.getContentLength();
InputStream is = conn.getInputStream();
File file = new File(savePath);
if (!file.exists())
{
file.mkdirs();
}
file = new File(saveFileName);
if (file.exists())
{
file.delete();
}
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
Message msg = mHandler.obtainMessage();
msg.what = 1;
msg.arg1 = progress;
if (progress >= lastRate + 1)
{
mHandler.sendMessage(msg);
lastRate = progress;
}
if (numread <= 0)
{
// 下载完成通知安装
mHandler.sendEmptyMessage(0);
// 下载完了，cancelled也要设置
canceled = true;
break;
}
fos.write(buf, 0, numread);
}
while (!canceled);// 点击取消就停止下载.
fos.close();
is.close();
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
};
4，安装APK
/**
* 安装apk
*
* @param url
*/
private void installApk()
{
File apkfile = new File(saveFileName);
if (!apkfile.exists())
{
return;
}
Intent i = new Intent(Intent.ACTION_VIEW);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.setDataAndType(Uri.parse("file://" + apkfile.toString()),
"application/vnd.android.package-archive");
mContext.startActivity(i);
stopSelf();
mNotification = null;
}